AMS AS7341 Light Sensor Datasheet

Datasheet

DS000504

AS7341

11-Channel Multi-Spectral Digital Sensor

v3-00

• 2020-Jun-25

Document Feedback

AS7341

Content Guide

Content Guide

8

8.1

8.2

8.3

8.4

8.5

9

5

6

7

1

1.1

1.2

1.3

2

3

3.1

3.2

4

General Description ....................... 3

Key Benefits & Features .............................. 3

Applications .................................................. 4

Block Diagram .............................................. 4

Ordering Information ..................... 5

Pin Assignment ............................. 6

Pin Diagram .................................................. 6

Pin Description ............................................. 6

Absolute Maximum Ratings .......... 7

Electrical Characteristics .............. 8

Optical Characteristics .................. 9

Typical Operating

Characteristics ............................. 16

Functional Description ................ 17

Channel Architecture .................................. 18

Sensor Array .............................................. 19

GPIO/INT .................................................... 19

SMUX ......................................................... 19

Integration Mode ........................................ 20

I²C Interface .................................. 22

9.1

9.2

9.3

9.4

9.5

I²C Address ................................................ 22

I²C Write Transaction ................................. 22

I²C Read Transaction ................................. 23

Timing Characteristics ............................... 23

Timing Diagrams ........................................ 24

10 Register Description ................... 25

10.1

Register Overview ...................................... 25

10.2

Detailed Register Description .................... 27

11 Application Information .............. 59

11.1

Schematic .................................................. 59

11.2

PCB Pad Layout......................................... 60

11.3

Application Optical Requirements .............. 61

12 Package Drawings & Markings ... 62

13

16

Tape & Reel Information ............. 63

14 Soldering & Storage Information 65

14.1

Storage Information ................................... 66

15 Revision Information ................... 67

Legal Information ........................ 68

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 2

Document Feedback

AS7341

General Description

1 General Description

The ams AS7341 is an 11-channel spectrometer enabling new consumer, commercial and laboratory applications including spectral identification, reflection and absorption for color matching, fluid or reagent analysis, passive ambient light measurement and color calibration. The spectral response is defined by individual channels covering approximately 350nm to 1000nm with 8 channels centered in the visible spectrum (VIS), plus one near-infrared (NIR) and a clear channel. The NIR channel in combination with the other VIS channels may provide information of surrounding ambient light conditions, including light source detection. Light source detection can be assisted by an integrated flicker channel that can automatically flag ambient light flicker at 50/60Hz as well as buffer data for externally calculating other flicker frequencies up to 2kHz.

AS7341 integrates high-precision optical filters onto standard CMOS silicon via nano-optic deposited interference filter technology. A built-in aperture controls the light entering the sensor array to increase accuracy. A programmable digital GPIO and LED current controller enable light source and trigger control, as well as enabling expandability for an added external photodiode. Device control and spectral data access is implemented through a serial I²C interface. The device is available in an ultralow profile package with dimensions of 3.1mm x 2mm x 1mm.

1.1 Key Benefits & Features

The benefits and features of AS7341, 11-Channel Multi-Spectral Digital Sensor , are listed below:

Figure 1: Added Value of Using AS7341

Benefits Features

Precision color, spectral composition and distribution measurments

Low power consumption and efficient I²C communication

Integrated ambient light flicker detection on chip and light source detection through NIR channel

8 optical channels distributed over the visible spectral range + clear and NIR channels realized via silicon nano-optic interference filter deposition technologies

●

1.8VDD operation, max 300µA

●

Configurable sleep mode to <5µA

●

Interrupt-driven device

●

Dedicated channel

●

Independently configurable timing and gain

●

Automatic gain adjustment

●

50Hz and 60Hz flicker detection flags

Electronic shutter/trigger and synch control

External photodiodes to expand detection range

GPIO can be used as external trigger input or light source synchronization output

GPIO can be used as input for external photodiodes including mid-IR range

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 3

Document Feedback

AS7341

General Description

1.2 Applications

●

High-precision reflective color point and spectral measurements

●

Fluid color, turbidity or reagent based constituent analysis

●

Spectral power distribution and passive ambient CCT measurement for home and building automation

●

High-end display color management

1.3 Block Diagram

The functional blocks of this device are shown below:

Figure 2 : Functional Blocks of AS7341

MCU

1.8V

1.8V

VDD

PGND

GND

AS7341

SCL

SDA

INT

8CH VIS

NIR/CLE AR

350-100 0nm sensor

GPIO

LDR e.g.:

Flash LED light in light source reflective surface

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 4

Document Feedback

2 Ordering Information

Ordering Code

AS7341-DLGT

AS7341-DLGM

Package

OLGA-8

OLGA-8

Delivery Form

Tape & Reel 13-inch

Tape & Reel 7-inch

AS7341

Ordering Information

Delivery Quantity

5000 pcs/reel

500 pcs/reel

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 5

Document Feedback

3 Pin Assignment

AS7341

Pin Assignment

3.1 Pin Diagram

Figure 3: Pin Assignment of AS7341 (TOP VIEW)

VDD

1

8

SDA

SCL

2

AS7341

TOP VIEW

GND

3

7

INT

6

GPIO

LDR

4 5

PGND

3.2 Pin Description

Figure 4: Pin Description of AS7341

7

8

Pin Number

3

4

1

2

5

6

Pin Name

VDD

SCL

GND

LDR

PGND

GPIO

INT

SDA

(1) Explanation of abbreviations:

DI Digital Input

D_I/O Digital Input/Output

DO_OD Digital Output, open drain

P

A_I/O

Power pin

Analog pin

Pin Type

(1)

P

DI

P

A_I/O

P

DI

DO_OD

D_I/O

Description

Positive supply terminal

Serial interface clock signal line for I

2

C interface

Ground. All voltages referenced to GND

LED current sink input

Ground. All voltages referenced to GND

General purpose input/output

Interrupt. Open drain output. Connect pull up resistor to

1.8V.

Serial interface data signal line for I

2

C interface

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 6

Document Feedback

AS7341

Absolute Maximum Ratings

4 Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. All voltages with respect to GND/PGND. Device parameters are guaranteed at V

DD

=1.8V and T

A

=25°C unless otherwise noted.

Figure 5

Absolute Maximum Ratings of AS7341

Symbol Parameter Min Max Unit Comments

Electrical Parameters

V

DD

/ V

GND

Supply Voltage to Ground

V

ANA_MAX

Analog Pins

V

DIG_MAX

Digital Pins

I

SCR

Input Current (latch-up immunity)

Output Terminal Current I

O

Electrostatic Discharge

ESD

HBM

Electrostatic Discharge HBM

ESD

CDM

Electrostatic Discharge CDM

Temperature Ranges and Storage Conditions

T

A

T

STRG

T

BODY

RH

NC

Operating Ambient Temperature

Storage Temperature Range

Package Body Temperature

Relative Humidity (noncondensing)

-0.3

-0.3

-0.3

-1

-30

-40

5

± 100

± 2000

± 500

2.2

3.6

3.6

20

85

85

260

85

V

V

V mA mA

V

V

°C

°C

°C

%

Applicable for pin VDD

Applicable for pin LDR

Applicable for pins

SCL,SDA and INT

JEDEC JESD78D Nov

2011

JS-001-2014

JEDEC JESD22-C101F

IPC/JEDEC J-STD-020

(1)

MSL

(1)

Moisture Sensitivity Level 3

Maximum floor life time of

168h

The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020

“Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices.” The lead finish for Pbfree leaded packages is “Matte Tin” (100% Sn)

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 7

Document Feedback

AS7341

Electrical Characteristics

5 Electrical Characteristics

All limits are guaranteed. The parameters with Min and Max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. All voltages with respect to GND/PGND. Device parameters are guaranteed at VDD=1.8V and T

A

=25°C unless otherwise noted.

Figure 6:

Electrical Characteristics of AS7341

Symbol Parameter Conditions Min Typ Max Unit

V

T

DD

A

Supply Voltage

Operating free-air temperature

(1)

Power Consumption

1.7

-30

1.8

25

2.0

70

V

°C

V

DD

=1.8V; T

A

=25°C

Active mode

(3)

210 300 µA

I

DD

Supply Current

(2)

V

DD

=1.8V; T

A

=25°C

Idle mode

(4)

V

DD

=1.8V; T

A

=25°C

Sleep mode

(5)

Digital pins

V

IH

SCL,SDA input high voltage

V

V

C

IL

OL

I

SCL,SDA input low voltage

INT, SDA output low voltage

Input pin capacitance

6mA sink current

1.26

35

0.7

60

5

0.54

0.4

µA

µA

V

V

V

10 pF

I leak

Leakage current into

SCL,SDA,INT pins

-5 5 µA

GPIO

C

(1)

(2)

(3)

(4)

(5)

LOAD

Maximum capacitive load GPIO

20 pF

While the device is operational across the temperature range, functionality will vary with temperature.

Supply current values are shown at the VDD pin and do not include current through pin LDR.

Active state occurs during active integration. (PON = “1” ; SP_EN = “1”) If wait is enabled (WEN = “1”), supply current is lower during the wait period

Idle state occurs when PON = “1” and all functions are disabled

Sleep state occurs when PON = “0” and I

2

C bus is idle. If I

2

C traffic is active device automatically enters idle mode.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 8

Document Feedback

AS7341

Optical Characteristics

6 Optical Characteristics

All limits are guaranteed. The parameters with Min and Max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. All voltages with respect to GND/PGND. Device parameters are guaranteed at VDD=1.8V and T

A

=25°C unless otherwise noted.

Figure 7:

AS7341 Optical Channel Summary

Channel

F5

F6

F7

F8

F1

F2

F3

F4

NIR (Near IR)

Clear

FD (Flicker Detection)

Center Wavelength

[nm] typical

415

445

480

515

555

590

630

680

910

Si response/non filtered

Si response/non filtered

Full Width Half Maximum

[nm] typical

39

40

50

52

26

30

36

39 n/a n/a n/a

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 9

Document Feedback

AS7341

Optical Characteristics

Figure 8:

Optical Characteristics of Channel F1, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F1

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

Irradiance responsivity channel F1

(2)

Center wavelength

(1)

LED: 420nm

(3)

Ee = 57 µW/cm²

AGAIN = 512x tint = 100ms

55

3200 counts counts

λ p

405 415 425 nm

(1)

(2)

(3)

FWHM

Full width half maximum

(1)

26

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

nm

Figure 9:

Optical Characteristics of Channel F2, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F2

Irradiance responsivity channel F2

(2)

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

110 counts

λ p

Center wavelength

(1)

435 445 455 nm

(1)

(2)

(3)

FWHM Full width half maximum

(1)

30

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

nm

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 10

Document Feedback

AS7341

Optical Characteristics

Figure 10:

Optical Characteristics of Channel F3, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F3

Irradiance responsivity channel F3

(2)

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

210 counts

λ p

Center wavelength

(1)

470 480 490 nm

(1)

(2)

(3)

FWHM Full width half maximum

(1)

36

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

nm

Figure 11:

Optical Characteristics of Channel F4, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F4

Irradiance responsivity channel F4

(2)

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

390 counts

λ p

Center wavelength

(1)

505 515 525 nm

(1)

(2)

(3)

FWHM

Full width half maximum

(1)

39

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

nm

Figure 12:

Optical Characteristics of Channel F5, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F5

Irradiance Responsivity channel F5

(2)

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

590 counts

λ p

Center wavelength

(1)

545 555

(1)

(2)

(3)

FWHM Full width half maximum

(1)

39

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

565 nm nm

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 11

Document Feedback

AS7341

Optical Characteristics

Figure 13:

Optical Characteristics of Channel F6, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F6

Irradiance responsivity channel F6

(2)

LED: warm white 2700K

(3)

Ee = 107.67

μW/cm

2

840 counts

λ p

Center wavelength

(1)

580 590 600 nm

(1)

(2)

(3)

FWHM Full width half maximum

(1)

40

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

nm

Figure 14:

Optical Characteristics of Channel F7, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max Unit

R e_F7

Irradiance responsivity channel F7

(2)

LED: warm white

2700K

(3)

Ee = 107.67

μW/cm²

1350

λ p

Center wavelength

(1)

620 630 640

(1)

(2)

(3)

FWHM Full width half maximum

(1)

50

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

counts nm nm

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 12

Document Feedback

AS7341

Optical Characteristics

Figure 15:

Optical Characteristics of Channel F8, AGAIN: 64x, Integration Time: 27.8ms

Symbol Parameter Conditions Min Typ Max

R e_F8

Irradiance responsivity channel F8

(2)

LED: warm white

2700K

(3)

Ee = 107.67

μW/cm²

1070

λ p

Center wavelength

(1)

670 680 690

(1)

(2)

(3)

FWHM

Full width half maximum

(1)

52

Parameter measured on a production ongoing sample bases on glass using diffused light

The following diffuser is used in final test on top of AS7341: ED1-C50

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

Figure 16:

Typical LED Spectra Used in Final Test of AS7341

0,6

0,5

0,4

0,3

0,2

0,1

0

1

0,9

0,8

0,7

350 450 950 1050 550 650 750 wavelength [nm]

850

LED 420nm

LED 940nm warm white

2700K

Unit

counts nm nm

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 13

Document Feedback

AS7341

Optical Characteristics

Figure 17:

Optical Characteristics of AS7341, AGAIN: 64x, Integration Time: 27.8ms (unless otherwise noted)

t t

Symbol

R

R e_CLEAR e_NIR

Dark

Gain ratio

ADC noise

(3) int

_2

(2)

ASTEP

(6)

R e_FLICKER

Dark

_1

(1)(6)

Parameter

Irradiance responsivity channel

CLEAR

Irradiance responsivity channel

FLICKER

Irradiance responsivity channel

NIR

Dark ADC 0-4 count value

Dark ADC 5 count value

Optical gain ratios, relative to 64x gain setting

Typical integration time

(4)

Integration time step size

Conditions

LED: warm white

2700K

(5)

Ee = 107.67

μW/cm

2

LED: warm white

2700K

(5)

Ee = 52.32

μW/cm

2

LED: warm white

2700K

(5)

Ee = 107.67

μW/cm

2

LED: 940nm

(5)

Ee = 98 µW/cm²

AGAIN = 128x tint = 100ms

Ee = 0μW/cm

2

AGAIN: 512x

Integration time: 98ms

Ee = 0μW/cm

2

AGAIN: 512x

Integration time: 98ms

AGAIN: 0.5x

AGAIN: 1x

AGAIN: 2x

AGAIN: 4x

AGAIN: 8x

AGAIN: 16x

AGAIN: 32x

AGAIN: 64x

AGAIN: 128x

AGAIN: 256x

AGAIN: 512x

AGAIN: 16x

Integration time: 10ms

ASTEP = 599

ATIME = 29

ASTEP = 999

Min Typ

1750

6810

112

5135

0

0

0.007 0.008 0.009

0.0145 0.016 0.0175

0.03 0.032 0.034

0.062 0.065 0.068

0.119 0.125 0.131

0.237 0.25 0.263

0.47 0.5

1

0.53

1.8

3.75

7.25

2

3.95

7.75

2.1

4.25

8.25

0.005

% full scale

50 ms

2.78

Max

3

5

Unit

counts counts counts counts counts ms

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 14

Document Feedback

AS7341

Optical Characteristics

Symbol Parameter Conditions Min Typ Max

(1)

(2)

(3)

(4)

(5) h ca

(6)

Half cone angle On the sensor 40

The typical 3-sigma distribution is between 0 and 1 counts for AGAIN setting of 16x.

The gain ratios are calculated relative to the response with integration time: 27.8ms and AGAIN: 64x.

ADC noise is calculated as the standard deviation of 1000 data samples divided by full scale.

Integration time, in milliseconds, is equal to: (ATIME + 1) x (ASTEP + 1) x 2.78µs

Refer to Figure 16:

Typical LED Spectra Used in Final Test of AS7341

Register 0xD6 / AZ_CONFIG is set to “1” – auto zero done before every integration cycle

Unit

deg

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 15

Document Feedback

AS7341

Typical Operating Characteristics

7 Typical Operating Characteristics

Figure 18:

Normalized Spectral Responsivity

F1

F7

1

0,9

0,8

0,7

0,6

0,5

0,4

0,3

0,2

0,1

0

350

F2

F8

F3

Clear

F4

NIR

450 550 650 750 wavelength [nm]

Figure 19:

Measured Spectral Responsivity Relative to F8

(1)

850

F5

F l i c k e r

950

F6

1050

F1_256x

F5_256x

Clear_512x

F2_256x

F6_256x

NIR_64x

F3_256x

F7_256x

F l i c k e r_64x

F4_256x

F8_256x

1,2

1

0,8

0,6

0,4

0,2

(1)

0

350 390 430 470 510 550 590 630 670 710 750 790 830 870 910 950 990 1030 wavelength [nm]

Fx_256x…AGAIN = 256x, diffuser mounted on top of package surface

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 16

Document Feedback

AS7341

Functional Description

8 Functional Description

Upon power-up (POR), the device initializes. During initialization

(typically 200μs), the device will deterministically send NAK on I²C and cannot accept I²C transactions. All communication with the device must be delayed and all outputs from the device must be ignored including interrupts. After initialization, the device enters the SLEEP state. In this operational state, the internal oscillator and other circuitry are not active, resulting in ultra-low power consumption. If an I²C transaction occurs during this state, the I²C core wakes up temporarily to service the communication. Once the Power ON bit,

“PON”, is enabled, the device enters the IDLE state in which the internal oscillator and attendant circuitry are active, but power consumption remains low. Whenever the spectral measurement is enabled (SP_EN

= “1”) the device enters the ACTIVE state. If the spectral measurement is disabled

(SP_EN

= “0”) the device returns to the IDLE state. The figure below describes a simplified state diagram and the typical supply currents in each state.

If Sleep after Interrupt is enabled

(SAI = “1” in register 0xAC), the state machine will enter SLEEP when an interrupt occurs. Entering SLEEP does not automatically change any of the register settings

(e.g. PON bit is still high, but the normal operational state is over-ridden by SLEEP state). SLEEP state is terminated when the SAI_ACTIVE bit is cleared (the status bit is in register 0xA7 and the clear status bit is in register 0xFA).

Figure 20: Simplified State Diagram

Power On

VDD > VDD_POR

SLEEP

IDD = 0.7µA (typ)

PON = „1"

IDLE

IDD = 35µA (typ)

SPM = „1"

ACTIVE

Spectral/Flicker

IDD = 115µA (typ)

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 17

Document Feedback

AS7341

Functional Description

8.1 Channel Architecture

The device features 6 independent optical channels with a dedicated 16-bit light-to-frequency converter. Gain and integration time of the 6 channels can be adjusted with the I2C interface. A wait time can be programed to automatically set a delay between two consecutive spectral measurements and to reduce overall power consumption. The other available channels can be accessed by a multiplexer (SMUX) connecting them to one of the internal ADCs.

Figure 21: Simplified Block Diagram

VDD

GND

PGND

GPIO

LDR

LED

6 x 16bit LTF ADC

CH0 ADC

CH1 ADC

CH2 ADC

CH3 ADC

CH4 ADC

CH5 ADC

CH0 data

CH5 data regist er

CH0 Data

CH1 Data

CH2 Data

CH3 Data

CH4 Data

CH5 Data

OTP

I2C

Interface interrupt handling

RCosc

SCL

SDA

INT

8 x VIS F1-F8

4x4 PD array

NIR/CLEAR/FLICKER

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 18

Document Feedback

AS7341

Functional Description

8.2 Sensor Array

The device features a 4x4-photodiode array. On top and below the photodiode array there are two photodiodes with dedicated functions such as flicker detection (

“FLICKER”) and near- infrared response (

“NIR”). A clear channel (“C”) – photodiode without filter – is provided at the left and right bottom corner. Each of the filter pairs can be mapped to one of the six internal ADCs (CH0

– CH5).

Figure 22:

Sensor Array

520µm

F L I C K E R

C

F1

F6

F4

F7

F3

F8

F2

F5

F5

F2

F8

F3

F7

F4

F6

F1

C NIR

8.3 GPIO/INT

The GPIO can be either used as input for external photodiodes or as synchronization input to start/stop the spectral measurement. (SYNS/SYND mode).The interrupt output pin INT can also be used to indicate the status (READY/BUSY) of the spectral measurement in mode SYNS and SYND.

8.4 SMUX

AS7341 integrates a sensor multiplexer (SMUX) that enables high-flexibility photodiode channel mapping to the six available ADCs. The 6 ADC limit requires that any measurement that includes more than six of the 8 VIS + 3 specialty channels will require 2 integration cycles. In all cases, after power-up, the SMUX needs to be configured before any spectral measurement is started. ams provides reference code and an application note on how to configure the SMUX. When flicker detection (FD) is used, the flicker diode needs to be configured to ADC5.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 19

Document Feedback

AS7341

Functional Description

8.5 Integration Mode

The device features three modes to perform a spectral measurement. The integration mode

(INT_MODE) can be configured in register 0x70 (CONFIG). For auto zero configuration refer to register 0xD6.

Figure 23:

Integration Mode Description

Mode Description Synchronization Integration Time Registers

SPM (spectral measurement, no sync)

INT_MODE = 0x0

SYNS (spectral measurement, start sync)

INT_MODE = 0x1

Default setting:

Integration is started with bit SP_EN

= “1”. Integration Time is set by register ATIME and ASTEP.

Integration with external start:

Integration is started with rising/falling edge on pin GPIO.

Integration Time is set by register

ATIME and ASTEP.

SYND (spectral measurement, start/stop sync)

INT_MODE = 0x3

Integration with external start and stop:

Integration is controlled via rising/falling edge on pin GPIO and register EDGE. If the number of edges on pin GPIO is reached, integration time is stopped. Actual integration time can be read out in register “ITIME”.

No

Yes (start)

Yes (start/stop)

Figure 24 :

SPM Mode

ATIME [7:0]

ASTEP [15:0]

ATIME [7:0]

ASTEP [15:0]

SP_EN

= “1”

INT_MODE = 0x0

ATIME [7:0]

ASTEP [15:0]

WTIME [7:0]

SP_EN

= “1”

INT_MODE = 0x1

ATIME [7:0]

ASTEP [15:0]

WTIME [7:0]

Rising/falling edge on pin GPIO and register EDGE[7:0]

SP_EN

= “1”

INT_MODE = 0x3

EDGE[7:0]

ITIME[23:0]

STATE

Start

I2C write enable register

WTIME

ATIME x ASTEP

IDLE

AUTO

ZERO

INTEGRATION

RES-

ULT

WAIT auto re-start

INTEGRATION

RES-

ULT

INT

I2C read data registers I2C read data registers

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 20

Document Feedback

AS7341

Functional Description

Figure 25 :

SYNS Mode

Start

STATE IDLE

AUTO

ZERO

SYNC

(GPIO)

READY_BUSYX

(INT)

WTIME

ATIME x ASTEP

INTEGRATION

RES-

ULT

I2C read data registers

Figure 26 :

SYND Mode

Start

STATE

IDLE

AUTO

ZERO

SYNC

(GPIO)

1st

READY_BUSYX

(INT)

2nd

EDGE = 0x4

ITIME

INTEGRATION

3rd 4th

RES-

ULT

5th

I2C read data registers

Start

WAIT

Start

IDLE INTEGRATION

INTEGRATION

1st 2nd 3rd 4th

RES-

ULT

I2C read data registers

RES-

ULT

5th

I2C read data registers

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 21

Document Feedback

AS7341

I²C Interface

9 I²C Interface

The device uses I²C serial communication protocol for communication. The device supports 7-bit chip addressing and both standard and full-speed clock frequency modes. Read and Write transactions comply with the standard set by Philips (now NXP). Internal to the device, an 8-bit buffer stores the register address location of the desired byte to read or write. This buffer auto-increments upon each byte transfer and is retained between transaction events (i.e. valid even after the master issues a

STOP command and the I²C bus is released). During consecutive Read transactions, the future/repeated I²C Read transaction may omit the memory address byte normally following the chip address byte; the buffer retains the last register address +1. All 16-bit fields have a latching scheme for reading and writing. In general, it is recommended to use I²C bursts whenever possible, especially in this case when accessing two bytes of one logical entity. When reading these fields, the low byte must be read first, and it triggers a 16-bit latch that stores the 16-bit field. The high byte must be read immediately afterwards. When writing to these fields, the low byte must be written first, immediately followed by the high byte. Reading or writing to these registers without following these requirements will cause errors.

9.1 I²C Address

Figure 27:

AS7341 I

2

C Slave Address

Device

AS7341

I

2

C Address

0x39

9.2 I²C Write Transaction

A Write transaction consists of a START, CHIP-ADDRESSWRITE, REGISTER-ADDRESS WRITE,

DATA BYTE(S), and STOP (P). Following each byte (9TH clock pulse) the slave places an

ACKNOWLEDGE/NOT- ACKNOWLEDGE (A/N) on the bus. If the slave transmits N, the master may issue a STOP.

Figure 28:

I

2

C Byte Write

S DW A WA A reg_data A P

WA++

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 22

Document Feedback

AS7341

I²C Interface

9.3 I²C Read Transaction

A Read transaction consists of a START, CHIP-ADDRESSWRITE, REGISTER-ADDRESS,

RESTART, CHIP-ADDRESSREAD, DATA BYTE(S), and STOP. Following all but the final byte the master places an ACK on the bus (9TH clock pulse). Termination of the Read transaction is indicated by a NACK being placed on the bus by the master, followed by STOP.

Figure 29:

I

2

C Read

S DW A WA A Sr DR A data N P

RA++

9.4 Timing Characteristics

Figure 30:

I²C Timing Characteristics

Symbol

f

SCL t

BUF t

HS;STA t

SU;STA t

SU;STO t

LOW t

HIGH t

HD;DAT t

SU;DAT t

F t

R

Parameter

I²C clock frequency

Bus free time between start and stop condition

Hold time after (repeated) start condition.

After this period, the first clock is generated.

Repeated start condition setup time

Stop condition setup time

SCL clock low period

SCL clock high period

Data hold time

Data setup time

Clock/data fall time

Clock/data rise time

Min Typ Max Unit

400 kHz

1.3

0.6

0.6

0.6

1.3

0.6

0

100

300

300

µs

µs

µs

µs

µs

µs ns ns ns ns

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 23

9.5 Timing Diagrams

Figure 31:

I²C Slave Timing Diagram

Document Feedback

AS7341

I²C Interface

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 24

Document Feedback

AS7341

Register Description

10 Register Description

The device is controlled and monitored by registers accessed through the I²C serial interface. These registers provide device control functions and can be read to determine device status and acquire device data.

The register set is summarized below. The values of all registers and fields that are listed as reserved or are not listed must not be changed at any time. Two-byte fields are always latched with the low byte followed by the high byte. The

“Name” column illustrates the purpose of each register by highlighting the function associated to each bit. The bits are shown from MSB (D7) to LSB (D0). GRAY fields are reserved and their values must not be changed at any time.

In order to access registers from 0x60 to 0x74 bit REG_BANK in register CFG0 (0xA9) needs to be set to “1”.

10.1 Register Overview

Figure 32:

Register Overview

Addr Name

0x60 ASTATUS

0x69

0x6A

0x6B

0x6C

0x6D

0x6E

0x6F

0x61

0x62

0x63

0x64

0x65

0x66

0x67

0x68

CH0_DATA

ITIME

CH1_DATA

CH2_DATA

CH3_DATA

CH4_DATA

CH5_DATA

0x70 CONFIG

0x71 STAT

0x72 EDGE

<D7>

ASAT_

STATUS

<D6> <D5> <D4> <D3> <D2> <D1> <D0>

AGAIN_STATUS [3:0]

CH0_DATA_L [7:0]

CH0_DATA_H [7:0]

ITIME_L [7:0]

ITIME_M [7:0]

ITIME_H [7:0]

CH1_DATA_L [7:0]

CH1_DATA_H [7:0]

CH2_DATA_L [7:0]

CH2_DATA_H [7:0]

CH3_DATA_L [7:0]

CH3_DATA_H [7:0]

CH4_DATA_L [7:0]

CH4_DATA_H [7:0]

CH5_DATA_L [7:0]

CH5_DATA_H [7:0]

LED_SEL INT_SEL

SYNC_EDGE [7:0]

INT_MODE[1:0]

WAIT_SYNC READY

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 25

Document Feedback

AS7341

Register Description

Addr Name

0x73 GPIO

0x74 LED

0x80 ENABLE

0x81 ATIME

0x83 WTIME

0x84

SP_TH_L

0x85

0x86

SP_TH_H

0x87

0x90 AUXID

0x91 REVID

0x92 ID

0x93 STATUS

0x94 ASTATUS

0x95

0x96

0x97

0x98

0x99

0x9A

0x9B

0x9C

0x9D

0x9E

0x9F

0xA0

CH0_DATA

CH1_DATA

CH2_DATA

CH3_DATA

CH4_DATA

CH5_DATA

0xA3 STATUS 2

0xA4 STATUS 3

0xA6 STATUS 5

0xA7 STATUS 6

0xA9 CFG 0

0xAA CFG 1

0xAC CFG 3

0xAF CFG 6

0xB1 CFG 8

<D7>

LED_ACT

<D6> <D5>

FDEN

<D4> <D3> <D2>

LED_DRIVE [6:0]

SMUXEN WEN

ATIME [7:0]

WTIME [7:0]

SP_TH_L_LSB [7:0]

SP_TH_L_MSB [7:0]

SP_TH_H_LSB [7:0]

SP_TH_H_MSB [7:0]

AUXID [7:0]

REVID [7:0]

ID [7:0]

AINT FINT

<D1>

PD_GPIO

SP_EN

ASAT

ASAT_

STATU

S

CINT

AGAIN_STATUS [3:0]

FIFO_

OV

AVALI

D

FIFO_TH [7:6]

CH0_DATA_L [7:0]

CH0_DATA_H [7:0]

CH1_DATA_L [7:0]

CH1_DATA_H [7:0]

CH2_DATA_L [7:0]

CH2_DATA_H [7:0]

CH3_DATA_L [7:0]

CH3_DATA_H [7:0]

CH4_DATA_L [7:0]

CH4_DATA_H [7:0]

CH5_DATA_L [7:0]

CH5_DATA_H [7:0]

ASAT_

DIG

ASAT_

ANA

FDSAT

_ANA

INT_SP_

H

OVTEMP

LOW_

POWER

INT_SP_L

FD_TRIG

SINT_FD

SP_TRIG

SAI_

ACT

REG_

BANK

WLONG

SAI

SMUX_

CMD[4:3]

FD_AGC

AGAIN[4:0]

SP_AGC

<D0>

PD_INT

PON

SINT

FDSAT_

DIG

INT_BUS

Y

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 26

Document Feedback

AS7341

Register Description

Addr Name

0xB2 CFG 9

0xB3 CFG 10

0xB5 CFG 12

0xBD PERS

0xBE GPIO 2

0xCA

0xCB

ASTEP

0xCF

AGC_GAIN_M

AX

0xD6 AZ_CONFIG

0xD8 FD_TIME 1

0xDA FD_TIME 2

0xD7 FD_CFG0

0xDB FD_STATUS

0xF9 INTENAB

0xFA CONTROL

0xFC FIFO_MAP

0xFD FIFO_LVL

0xFE

0xFF

FDATA

<D7>

SIEN

_FD

AGC_H [7:6]

<D6> <D5> <D4>

AGC_L[7:6]

SIEN

_SMUX

<D3>

GPIO_

INV

ASTEP [7:0]

ASTEP [15:8]

AGC_FD_GAIN_MAX [7:4]

<D2> <D1>

FD_PERS [2:0]

SP_TH_CH [2:0]

APERS [3:0]

GPIO_

IN

GPIO_

OUT

GPIO_

IN

AGC_AGAIN_MAX [3:0]

AT_NTH_ITERATION [7:0]

FD_TIME [7:0]

FD_GAIN [7:3] FD_TIME [10:8]

FD_

FIFO

ASIEN

FD_

VALID

FD_

SAT

FD_

120HZ_

VALID

SP_IEN

FD_

100Hz_

VALID

FIEN

AZ_SP_

MAN

FIFO_WRITE_CH5_DATA

– FIFO_WRITE_CH0_DATA [6:1]

FIFO_LVL [7:0]

FDATA [7:0]

FDATA [15:8]

FD_

120Hz

CIEN

FIFO_

CLR

<D0>

FD_

100Hz

SIEN

CLEAR_

SAI_ACT

ASTATU

S

10.2 Detailed Register Description

For easier readability, the detailed register description is done in groups of registers related to dedicated device functions. This is not necessarily related to its register address.

Explanation of register access abbreviations:

RW = read or write

R = read only

W = write only

SC = self-clearing after access

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 27

Document Feedback

AS7341

Register Description

10.2.1 Enable and Configuration Register

The following registers are needed to power up and configure the device. To operate the device set bit

PON = “1” first (register 0x80) after that configure the device and enable interrupts before setting

SP_EN

= “1”. Changing configuration while SP_EN = “1” may result in invalid results. Register

CONFIG (0x70) is used to set the INT_MODE (SYNS,SYND).

ENABLE Register (Address 0x80)

Figure 33:

ENABLE Register

6

5

2

1

Addr: 0x80

Bit

7

Bit Name

reserved

4

3

0

FDEN reserved

SMUXEN

WEN reserved

SP_EN

PON

ENABLE

Default

0

0

0

0

0

0

0

0

Access Bit Description

RW

RW

RW

RW

RW

RW

RW

RW reserved

Flicker Detection Enable.

0: Flicker Detection disabled

1: Flicker Detection enabled reserved

SMUX Enable.

1: Starts SMUX command

Note: this bit gets cleared automatically as soon as

SMUX operation is finished

Wait Enable.

0: Wait time between two consecutive spectral measurements disabled

1: Wait time between two consecutive spectral measurements enabled reserved

Spectral Measurement Enable.

0: Spectral Measurement Disabled

1: Spectral Measurement Enabled

Power ON.

0: AS7341 disabled

1: AS7341 enabled

Note: When bit is set, internal oscillator is activated, allowing timers and ADC channels to operate.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 28

Document Feedback

AS7341

Register Description

CONFIG Register (Address 0x70)

Figure 34:

CONFIG Register

Addr: 0x70

Bit

7:4

Bit Name

reserved

3

2

1:0

LED_SEL

INT_SEL

INT_MODE

CONFIG

Default

0

0

0

0

Access Bit Description

RW

RW

RW

RW reserved

LED control.

0: External LED not controlled by AS7341

1: Register LED controls LED connected to pin LDR

Note: register 0x74

1: Sync signal applied on output pin INT

Ambient light sensing mode:

0: SPM mode (spectral measurement, normal mode)

1: SYNS mode

2: reserved

3: SYND mode

Note: in SYND mode it is recommended to use register 0x60 to 0x6F to read out spectral data.

GPIO Register (Address 0x73)

Figure 35:

GPIO Register

Addr: 0x73

Bit

7:2

1

0

Bit Name

reserved

PD_GPIO

PD_INT

GPIO

Default

0

0

0

Access

RW

RW

RW

Bit Description

reserved

1: Photo diode connected to pin GPIO

1: Photo diode connected to pin INT

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 29

Document Feedback

GPIO 2 Register (Address 0xBE)

Figure 36:

GPIO2 Register

2

1

Addr: 0xBE

Bit

7:4

3

Bit Name

reserved

GPIO_INV

GPIO_IN_EN

GPIO_OUT

0

1

GPIO 2

Default

0

0

0 GPIO_IN 0

AS7341

Register Description

Access Bit Description

RW

RW

RW

R reserved

GPIO Invert.

If set, the GPIO output is inverted.

GPIO Input Enable.

If set, the GPIO pin accepts a non-floating input.

GPIO Output.

If set, the output state of the GPIO is active directly.

GPIO Input.

Indicates the status of the GPIO input if

GPIO_IN_EN is set.

LED Register (Address 0x74)

Figure 37:

LED Register

Addr: 0x74

Bit Bit Name

LED

Default

7 LED_ACT 0

6:0 LED_DRIVE 000 0100

Access Bit Description

RW

RW

LED control.

0: External LED connected to pin LDR off

1: External LED connected to pin LDR on

LED driving strength.

000 0000: 4mA

000 0001: 6mA

000 0010: 8mA

000 0011: 10mA

000 0100:

12mA

……

111 1110: 256mA

111 1111: 258mA

Note: Bit LED_SEL (register 0x70) needs to be set to “1” to control LED connected to pin LDR.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 30

INTENAB Register (Address 0xF9)

Figure 38:

INTENAB Register

Document Feedback

7

2

1

Addr: 0xF9

Bit Bit Name

6:4

3

0

ASIEN reserved

SP_IEN

F_IEN reserved

SIEN

AS7341

Register Description

INTENAB

Default

0

0

0

0

Access Bit Description

RW

RW

RW

RW

Spectral and Flicker Detect Saturation Interrupt

Enable.

When asserted permits saturation interrupts to be generated. reserved

Spectral Interrupt Enable.

When asserted permits interrupts to be generated, subject to the spectral thresholds and persistence filter. Bit is mirrored in the ENABLE register.

FIFO Buffer Interrupt Enable.

When asserted permits interrupt to be generated when FIFO_LVL exceeds the FIFO threshold condition. reserved

System Interrupt Enable.

When asserted permits system interrupts to be generated. Indicates that flicker detection status has changed or SMUX operation has finished.

CONTROL Register (Address 0xFA)

Figure 39:

CONTROL Register

Addr: 0xFA

Bit

7:3

Bit Name

reserved

2 SP_MAN_AZ

1

0

FIFO_CLR

CLEAR_SAI_ACT

CONTROL

Default

0

0

0

0

Access Bit Description

RW

RW

RW reserved

Spectral Engine Manual Autozero.

Starts a manual autozero of the spectral engines.

Set SP_EN = 0 before starting a manual autozero for it to work.

FIFO Buffer Clear.

Clears all FIFO data, FINT, FIFO_OV, and

FIFO_LVL.

Clear Sleep-After-Interrupt Active.

Clears SAI_ACTIVE, ends sleep, and restarts device operation.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 31

Document Feedback

AS7341

Register Description

10.2.2 ADC Timing Configuration / Integration Time

The integration time in INT

_MODE = “00” and “01” (SPM/SYNS) is set using the ATIME (0x81) and

ASTEP (0xCA, 0xCB) registers. The integration time, in milliseconds, is equal to:

Equation 1: Setting the integration time

𝑡 𝑖𝑛𝑡

= (𝐴𝑇𝐼𝑀𝐸 + 1) × (𝐴𝑆𝑇𝐸𝑃 + 1) × 2.78µ𝑠

The reset value for ASTEP is 999 (2.78ms) and the recommended configuration for these two registers is ASTEP = 599 and ATIME = 29, which results in an integration time of 50ms. It is not allowed that both settings

–ATIME and ASTEP – are set to “0”.

The integration time also defines the full-scale ADC value, which is equal to:

Equation 2: ADC full scale value

(1)

𝐴𝐷𝐶 𝑓𝑢𝑙𝑙𝑠𝑐𝑎𝑙𝑒

= (𝐴𝑇𝐼𝑀𝐸 + 1) × (𝐴𝑆𝑇𝐸𝑃 + 1)

ATIME Register (Address 0x81)

Figure 40:

ATIME Register

Addr: 0x81 ATIME

Bit Bit Name Default Access Bit Description

7:0

(1)

ATIME 0x00 RW

Integration time.

Sets the number of integration steps from 1 to 256.

Value Integration Time

0 ASTEP n ASTEP x (n+1)

255 256 x ASTEP

The maximum ADC count is 65535. Any ATIME/ASTEP field setting resulting in higher ADCfullscale values would result in a full-scale of 65535.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 32

Document Feedback

ASTEP Register (Address 0xCA, 0xCB)

Figure 41:

ASTEP Register

Addr: 0xCA, 0xCB

Bit Bit Name

ASTEP

Default

7:0

15:8

ASTEP 0xCA

ASTEP 0xCB

999

AS7341

Register Description

Access Bit Description

RW

Integration time step size.

Sets the integration time per step in increments of

2.78µs. The default value is 999.

VALUE

0 n

STEP SIZE

2.78µs

2.78µs x (n+1)

599

999

17999

65534

65535

1.67ms

2.78ms

50ms

182ms reserved, do not use

WTIME Register (Address 0x83)

If wait is enabled (WEN = “1” register 0x80), each new measurement is started based on WTIME. It is necessary for WTIME to be sufficiently long for spectral integration and any other functions to be completed within the period. The device will warn the user if the timing is configured incorrectly. If

WTIME is too short, then SP

_TRIG in register STATUS6 (ADDR: 0xA7) will be set to “1”.

Figure 42:

WTIME Register

Addr: 0x83

Bit Bit Name

7:0 WTIME

WTIME

Default

0x00

Access Bit Description

RW

Spectral Measurement Wait time.

8-bit value to specify the delay between two consecutive spectral measurements.

Value Wait Cycles Wait Time

0x00

0x01 n

0xff

1

2 n

256

2.78ms

5.56ms

2.78ms x (n+1)

711ms

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 33

Document Feedback

AS7341

Register Description

ITIME Register (Address 0x63, 0x64, 0x65)

The register ITIME can be used to read-out the actual integration time in INT

_MODE = “11” (SYND).

In SYND mode the integration time is defined by the register “EDGE” and the device is running integration until the number of falling edges on pin GPIO is reached.

Equation 3: Calculating the integration time in SYND mode

𝑡 𝑖𝑛𝑡

= 𝐼𝑇𝐼𝑀𝐸 × 2.78µ𝑠

Figure 43:

ITIME_L Register

Addr: 0x63

Bit

7:0

Bit Name

ITIME_L

ITIME_L

Default

0

Access Bit Description

R Integration time in integration mode SYND

Figure 44:

ITIME_M Register

Addr: 0x64

Bit

15:8

Bit Name

ITIME_M

ITIME_M

Default

0

Access Bit Description

R Integration time in integration mode SYND

Figure 45:

ITIME_H Register

Addr: 0x65

Bit

23:16

Bit Name

ITIME_H

ITIME_H

Default

0

Access Bit Description

R Integration time in integration mode SYND

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 34

Document Feedback

EDGE Register (Address 0x72)

Figure 46:

EDGE Register

Addr: 0x72

Bit Bit Name

7:0 SYNC_EDGE

EDGE

Default

0

Access

RW

Bit Description

AS7341

Register Description

Number of falling SYNC-edges between start and stop of integration in mode SYND

Number of edges = SYNC_EDGE + 1

FD_TIME Register (Address 0xD8, 0xDA)

The register FD Time 1 and FD Time 2 can be used to configure the integration time and gain (ADC 5) of the flicker detection independently from the other ADCs. The FD_TIME register is an 11-bit register with the MSB in register 0xDA (bit 10:8) and the LSB in register 0xD8 (bit 7:0). The bit FDEN (register

0x80) must be set to “1” in order to use the FD_TIME registers. If the bit FDEN is not set, ADC5 runs automatically with the same gain and integration time as ADC0 to ADC4.

Equation 4: Calculating the flicker detection integration time

𝑡 𝑖𝑛𝑡_𝐹𝐷

= 𝐹𝐷_𝑇𝐼𝑀𝐸 × 2.78µ𝑠

Figure 47:

FD Time Register

Addr: 0xD8

Bit

7:0

Bit Name

FD_TIME [7:0]

FD_TIME_1

Default

0

Access Bit Description

RW

LSB of flicker detection integration time

Note: must not be changed during FDEN = 1 and

PON = 1.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 35

Document Feedback

AS7341

Register Description

Figure 48:

FD Time Register

Addr: 0xDA

Bit Bit Name

7:3 FD_GAIN

2:0 FD_TIME [10:8]

FD_TIME_2

Default

9

0

Access Bit Description

R/W

RW

Flicker Detection gain setting (ADC5)

2

3

4

VALUE

0

1

2x

4x

8x

GAIN

0.5x

1x

7

8

5

6

16x

32x

64x

128x

9

10

256x

512x

MSB of flicker detection integration time

Note: must not be changed during FDEN = 1 and

PON = 1.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 36

Document Feedback

AS7341

Register Description

10.2.3 ADC Configuration (gai n, AGC…)

The following registers provide configuration for the 6 integrated ADCs (CH0 to CH5). It is possible to adjust the gain, configure and enable the automatic gain control (AGC) and setup the auto zero compensation for the engines.

CFG1 Register (Address 0xAA)

Figure 49:

CFG1 Register

Addr: 0xAA

Bit

7:5

Bit Name

reserved

CFG1

Default

0

4:0 AGAIN 9

Access Bit Description

RW

5

6

3

4

7

0

1

2

8

9

10 reserved

Spectral engines gain setting.

Sets the spectral sensitivity.

VALUE GAIN

128x

256x

512x

0.5x

1x

2x

4x

8x

16x

32x

64x

CFG10 Register (Address 0xB3)

Figure 50:

CFG10 Register

Addr: 0xB3

Bit Bit Name

CFG10

Default

7:6 AGC_H 3

Access Bit Description

RW

AGC High Hysteresis.

Sets the data threshold at which AGAIN is reduced when spectral AGC mode is enabled. The threshold is automatically calculated internally as a percentage of full-scale. Note that full-scale is equal to (ATIME +

1) x (ASTEP + 1).

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 37

Addr: 0xB3

Bit Bit Name

5:4 AGC_L

3 reserved

2:0 FD_PERS

Document Feedback

AS7341

Register Description

CFG10

Default

3

0

2

Access Bit Description

RW

RW

VALUE

0

SIGNAL

50%

1

2

62.5%

75%

3 87.5%

AGC Low Hysteresis.

Sets the data threshold at which AGAIN is increased when spectral AGC mode is enabled. The threshold is automatically calculated internally as a percentage of full-scale. Note that full-scale is equal to (ATIME +

1) x (ASTEP + 1).

VALUE SIGNAL

0

1

2

12.5%

25%

37.5%

50% 3 reserved

Flicker Detect Persistence.

Sets the number of consecutive flicker detect results that must be different before the flicker detect status will be changed. Flicker detection interrupts on SINT are affected by this setting. Flicker detect persistence is equal to 2

(𝐹𝐷

𝑃𝐸𝑅𝑆

−1)

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 38

Document Feedback

AS7341

Register Description

AZ_CONFIG Register (Address 0xD6)

The following register configures how often the spectral engine offsets are reset (auto zero) to compensate for changes of the device temperature. The typical time auto zero needs to be completed is 15ms.

Figure 51:

AZ_CONFIG Register

Addr: 0xD6

Bit

7:0

AZ_CONFIG

Bit Name Default Access Bit Description

AZ_NTH_ITERATION 255 RW

1

2

…

254

255

AUTOZERO FREQUENCY.

Sets the frequency at which the device performs auto zero of the spectral engines.

Note: If FD

EN = “1” auto zero is also done for ADC 5.

The flicker detection measurement will be interrupted and restarted in this case.

VALUE

0

AUTOZERO FREQUENCY

Never (not recommended)

Every integration cycle

Every 2 cycles

Every

“AZ_NTH_ITERATION” cycle

Every 254 cycles

Only before first measurement cycle

AGC_GAIN_MAX Register (Address 0xCF)

Figure 52:

AGC_GAIN_MAX Register

Addr: 0xCF

Bit

7:4

3:0

Bit Name

AGC_FD_GAIN_MAX 9

AGC_AGAIN_MAX

AGC_GAIN_MAX

Default

9

Access Bit Description

RW

RW

Flicker Detection AGC Gain Max.

Sets the maximum gain for flicker detection to

2

𝐴𝐺𝐶_𝐹𝐷_𝐺𝐼𝐴𝑁_𝑀𝐴𝑋

Default value is 9 (256x). The range can be set from

0 (0.5x) to 10 (512x).

AGC Gain Max.

Sets the maximum gain for AGC engine to

2

𝐴𝐺𝐶_𝐹𝐷_𝐺𝐼𝐴𝑁_𝑀𝐴𝑋

Default value is 9 (256x). The range can be set from

0 (0.5x) to 10 (512x).

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 39

Document Feedback

CFG8 Register (Address 0xB1)

Figure 53:

CFG8 Register

Addr: 0xB1

Bit Bit Name

CFG8

Default

7:6

2

1

0

5:4

3

FIFO_TH reserved

FD_AGC

SP_AGC reserved reserved

2

0

1

0

0

0

AS7341

Register Description

Access Bit Description

R/W

RW

RW

FIFO Threshold.

Sets a threshold on the FIFO level that triggers the first FIFO buffer interrupt (FINT).

VALUE

0

1

FIFO_LVL

1

4

2

3 reserved

Flicker Detect AGC Enable

.

If set, device uses automatic gain control for the flicker detect engine to maximize flicker signal and avoid saturation.

Spectral AGC enable.

If asserted, device uses automatic gain control for the spectral engines to maximize signal while avoiding saturation. reserved reserved

8

16

10.2.4 Device Identification

The following registers provided device identification. Device ID, revision ID and auxiliary ID are read only.

AUXID Register (Address 0x90)

Figure 54:

AUXID Register

Addr: 0x90

Bit

7:4

3:0

Bit Name

reserved

AUXID

AUXID

Default

000

Access Bit Description

R reserved

Auxiliary identification

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 40

Document Feedback

REVID Register (Address 0x91)

Figure 55:

REVID Register

Addr: 0x91

Bit

7:3

2:0

Bit Name

reserved

REV_ID

REVID

Default

000

Access

R

Bit Description

AS7341

Register Description reserved

Revision number identification

ID Register (Address 0x92)

Figure 56:

ID Register

Addr: 0x92

Bit Bit Name

7:2

1:0

ID reserved

ID

Default

001001

Access Bit Description

R

Part number Identification

Value 001001 reserved

10.2.5 Spectral Interrupt Configuration

The spectral interrupt threshold registers provide 16-bit values to be used as the high and low thresholds for comparison to the 16-bit CH0_DATA values (ADC CH0). If SP_IEN (register 0xF9) is enabled and CH0_DATA is not between the two thresholds for the number of consecutive measurements specified in APERS (register 0xBD) an interrupt is set.

SP_TH_L_LSB Register (Address 0x84)

Figure 57:

SP_TH_L_LSB Register

Addr: 0x84

Bit

7:0

Bit Name

SP_TH_L_LSB

SP_TH_L_LSB

Default

0x00

Access Bit Description

RW

Spectral low threshold LSB

This register provides the low byte of the low interrupt threshold (CH0).

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 41

Document Feedback

SP_TH_L_MSB Register (Address 0x85)

Figure 58:

SP_TH_L_MSB Register

Addr: 0x85

Bit Bit Name

7:0 SP_TH_L_MSB

AS7341

Register Description

SP_TH_L_MSB

Default

0x00

Access Bit Description

RW

Spectral low threshold MSB

This register provides the high byte of the low interrupt threshold (CH0).

Both SP_TH_L registers are combined to a 16-bit threshold. If the value captured by channel 0 is below the low threshold and the APERS value is reached the bit SP_IEN is set and an interrupt is generated.

There is an 8-bit data latch implemented that stores the written low byte until the high byte is written.

Both bytes will be applied at the same time to avoid an invalid threshold.

Note: The LSB register cannot be changed without writing to the MSB register. It is recommended to write to SP_TH_L_LSB and SP_TH_L_MSB within one I

2

C command.

SP_TH_H_LSB Register (Address 0x86)

Figure 59:

SP_TH_H_LSB Register

Addr: 0x86

Bit

7:0

Bit Name

SP_TH_H_LSB

SP_TH_H_LSB

Default

0x00

Access Bit Description

RW

Spectral high threshold LSB

This register provides the low byte of the high interrupt threshold (CH0).

SP _TH_H_MSB Register (Address 0x87)

Figure 60:

SP _TH_H_MSB Register

Addr: 0x87

Bit

7:0

Bit Name

SP_TH_H_MSB

SP _TH_H_MSB

Default

0x00

Access Bit Description

RW

Spectral high threshold MSB

This register provides the high byte of the high interrupt threshold (CH0).

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 42

Document Feedback

AS7341

Register Description

Addr: 0x87

Bit

CFG12 Register (Address 0xB5)

Figure 61:

CFG12 Register

Addr: 0xB5

Bit

7:3

Bit Name

reserved

CFG12

Default

0

2:0

Bit Name

SP_TH_CH

SP _TH_H_MSB

Default Access Bit Description

Both SP_TH_H registers are combined to a 16-bit threshold. If the value captured by channel 0 is above the high threshold and the APERS value is reached the bit SP_IEN is set and an interrupt is generated.

0

Access Bit Description

RW

2

3

0

1

4 reserved

Spectral Threshold Channel.

Sets the channel used for interrupts, persistence and the AGC, if enabled, to determine device status and gain settings.

VALUE CHANNEL

CH0

CH1

CH2

CH3

CH4

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 43

Document Feedback

AS7341

Register Description

10.2.6 Device Status Register

The following register provide status of the device and indicate details about saturation, interrupts, over temperature, device execution and ambient light flicker detection.

STAT Register (Address 0x71)

Figure 62:

STAT Register

Addr: 0x71

Bit

7:2

1

Bit Name

reserved

WAIT_SYNC

0 READY

STAT

Default

0

0

0

Access Bit Description

RW

R

R reserved

1: Device waits for sync pulse on GPIO to start integration (SYNS / SYND INT_mode)

0: Spectral measurement status is busy

1: Spectral measurement status is ready

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 44

Document Feedback

AS7341

Register Description

STATUS Register (Address 0x93)

The primary status register for AS7341 indicates if there are saturation or interrupt events that need to be handled by the user. This register is selfclearing, meaning that writing a “1” to any bit in the register clears that status bit. In this way, the user should read the STATUS register, handle all indicated event(s) and then write the register value back to STATUS to clear the handled events.

Writing “0” will not clear those bits if they have a value of “1”, which means that new events that occurred since the last read of the STATUS register will not be accidentally cleared.

Figure 63:

STATUS Register

Addr: 0x93

Bit Bit Name

7

1

0

6:4

3

2

ASAT reserved

AINT

FINT

C_INT

SINT

0

0

STATUS

Default

0

0

0

0

Access Bit Description

R, SC

R

R, SC

R, SC

R, SC

R, SC

Spectral and Flicker Detect saturation.

If ASIEN is set, indicates Spectral saturation. Check

STATUS2 register to distinguish between analog or digital saturation. reserved

Spectral Channel Interrupt.

If SP_IEN is set, indicates that a spectral event that met the programmed thresholds and persistence

(APERS) occurred.

FIFO Buffer Interrupt.

If FIEN is set, indicates that the FIFO_LVL fulfills the threshold condition. If cleared by writing 1, the interrupt will be asserted again as more data is collected. To fully clear this interrupt, all data must be read from the FIFO buffer.

Calibration Interrupt.

System Interrupt.

If SIEN is set, indicates that system interrupt is set.

Refer to Status5 register

.

STATUS 2 Register (Address 0xA3)

Figure 64:

STATUS 2 Register

Addr: 0xA3

Bit

7

Bit Name

reserved

6

5

AVALID reserved

STATUS 2

Default

0

0

0

Access Bit Description

R reserved

Spectral Valid

.

Indicates that the spectral measurement has been completed reserved

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 45

Document Feedback

AS7341

Register Description

Addr: 0xA3

Bit

4

3

2

1

0

Bit Name

ASAT_DIGITAL

ASAT_ANALOG reserved

FDSAT_ANALOG

FDSAT_DIGITAL

STATUS 2

Default

0

0

0

0

0

Access Bit Description

R

R

R

R

R

Digital saturation

.

Indicates that the maximum counter value has been reached. Maximum counter value depends on integration time set in the ATIME register.

Analog saturation

.

Indicates that the intensity of ambient light has exceeded the maximum integration level for the spectral analog circuit. reserved

Flicker detect analog saturation

.

Indicates that the intensity of ambient light has exceeded the maximum integration level for the analog circuit for flicker detection.

Flicker detect digital saturation

.

Indicates that the maximum counter value has been reached during flicker detection.

STATUS 3 Register (Address 0xA4)

Figure 65:

STATUS 3 Register

Addr: 0xA4

Bit

7:6

5

4

3:0

Bit Name

reserved

INT_SP_H

INT_SP_L reserved

STATUS 3

Default

0

0

0

0

Access Bit Description

R

R reserved

Spectral interrupt high.

Indicates that a spectral interrupt occurred because the data exceeded the high threshold.

Spectral interrupt low

.

Indicates that a spectral interrupt occurred because the data is below the low threshold. reserved

STATUS 5 Register (Address 0xA6)

Figure 66:

STATUS 5 Register

Addr: 0xA6

Bit

7:4

Bit Name

reserved

STATUS 5

Default

0

Access Bit Description

reserved

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 46

Document Feedback

AS7341

Register Description

Addr: 0xA6

Bit

3

2

1:0

Bit Name

SINT_FD

SINT_SMUX reserved

STATUS 5

Default

0

0

0

Access Bit Description

R

R

Flicker Detect interrupt.

If SIEN_FD is set, indicates that the FD_STATUS register status has changed

SMUX operation interrupt.

Indicates that SMUX command execution has finished. reserved

7

4

3

2

STATUS 6 Register (Address 0xA7)

Figure 67:

STATUS 6 Register

Addr: 0xA7

Bit Bit Name

6

5

1

0

FIFO_OV reserved

OVTEMP

FD_TRIG reserved

SP_TRIG

SAI_ACTIVE

INT_BUSY

STATUS 6

Default

0

0

0

0

0

0

0

0

Access Bit Description

R

R

R

R

R

R

R

FIFO Buffer Overflow.

Indicates that the FIFO buffer overflowed and information has been lost. Bit is automatically cleared when the FIFO buffer is read reserved

Over Temperature Detected.

Indicates the device temperature is too high. Write 1 to clear this bit.

Flicker Detect Trigger Error.

Indicates that there is a timing error that prevents flicker detect from working correctly. reserved

Spectral Trigger Error.

Indicates that there is a timing error. The WTIME is too short for the selected ATIME.

Sleep after Interrupt Active.

Indicates that the device is in SLEEP due to an interrupt. To exit SLEEP mode, clear this bit.

Initialization Busy.

Indicates that the device is initializing. This bit will remain 1 for about 300μs after power on. Do not interact with the device until initialization is complete.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 47

Document Feedback

FD_STATUS Register (Address 0xDB)

Figure 68:

FD STATUS Register

AS7341

Register Description

Addr: 0xDB

Bit

7:6

5

FD_STATUS

Bit Name

reserved

FD_MEASUREMENT_

VALID

0

Default

4

3

2

1

0

FD_SATURATION_

DETECTED

0

FD_120HZ_FLICKER_

VALID

0

FD_100HZ_FLICKER_

VALID

0

FD_120HZ_FLICKER 0

FD_100HZ_FLICKER 0

Access Bit Description

R

R

R

R

R

R reserved

Flicker Detection Measurement Valid.

Indicates that flicker detection measurement is complete. Write 1 to this bit to clear this field.

Flicker Saturation Detected.

Indicates that saturation occurred during the last flicker detection measurement, and the result may not be valid. Write 1 to this bit to clear this field.

Flicker Detection 120Hz Flicker Valid.

Indicates that the 120Hz flicker detection calculation is valid. Write 1 to this bit to clear this field.

Flicker Detection 100Hz Flicker Valid.

Indicates that the 100Hz flicker detection calculation is valid. Write 1 to this bit to clear this field.

Flicker Detected at 120Hz.

Indicates if an ambient light source is flickering at

120Hz.

Flicker Detected at 100Hz.

Indicates if an ambient light source is flickering at

100Hz.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 48

Document Feedback

AS7341

Register Description

10.2.7 Spectral Data and Status

The ASTATUS register is mapped to register address 0x60 and 0x94. It provides saturation and gain status associated to each set of spectral data. Reading the ASTATUS register (0x60 or 0x94) latches all 12 spectral data bytes to that status read. Reading these bytes consecutively (0x60 to 0x6F or 0x94 to 0xA0) ensures that the data is concurrent. All spectral data are stored as 16-bit values. If flicker detection is enabled, spectral channel five (CH5 ADC) is used for the flicker detection function and

CH5_DATA will read “0”. The ASTATUS and spectral data registers are read only.

In SPM or SYNS mode, it is recommended to use the ASTATUS register 0x94 and spectral data register 0x94 to 0xA0. In SYND mode, it is possible to use register 0x60 to 0x6F for easier implementation.

ASTATUS Register (Address 0x60 or 0x94)

Figure 69:

ASTATUS Register

Addr: 0x60 and 0x94

Bit

7

6:4

3:0

Bit Name

ASAT_STATUS reserved

AGAIN_STATUS

ASTATUS

Default

0

0

0

Access Bit Description

R, SC

R

R, SC

Saturation Status.

Indicates if the latched data is affected by analog or digital saturation. reserved

Gain Status.

Indicates the gain applied for the spectral data latched to this ASTATUS read. The gain from this status read is required to calculate spectral results if

AGC is enabled.

CH0_DATA Register (Address 0x95/0x96)

Figure 70:

CH0_DATA_L Register

Addr: 0x95

Bit

7:0

Bit Name

CH0_DATA_L

CH0_DATA_L

Default

0

Access Bit Description

R CH0 ADC data

– low byte

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 49

Document Feedback

Figure 71:

CH0_DATA_H Register

Addr: 0x96

Bit

7:0

Bit Name

CH0_DATA_H

CH0_DATA_H

Default

0

Access Bit Description

R CH0 ADC data

– high byte

CH1_DATA Register (Address 0x97/0x98)

Figure 72:

CH1_DATA_L Register

Addr: 0x97

Bit

7:0

Bit Name

CH1_DATA_L

CH1_DATA_L

Default

0

Access Bit Description

R CH1 ADC data

– low byte

Figure 73:

CH1_DATA_H Register

Addr: 0x98

Bit

7:0

Bit Name

CH1_DATA_H

CH1_DATA_H

Default

0

Access Bit Description

R CH1 ADC data

– high byte

AS7341

Register Description

CH2_DATA Register (Address 0x99/0x9A)

Figure 74:

CH2_DATA_L Register

Addr: 0x99

Bit

7:0

Bit Name

CH2_DATA_L

CH2_DATA_L

Default

0

Access Bit Description

R CH2 ADC data

– low byte

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 50

Document Feedback

Figure 75:

CH2_DATA_H Register

Addr: 0x9A

Bit

7:0

Bit Name

CH2_DATA_H

CH2_DATA_H

Default

0

Access Bit Description

R CH2 ADC data

– high byte

CH3_DATA Register (Address 0x9B/0x9C)

Figure 76:

CH3_DATA_L Register

Addr: 0x9B

Bit

7:0

Bit Name

CH3_DATA_L

CH3_DATA_L

Default

0

Access Bit Description

R CH3 ADC data

– low byte

Figure 77:

CH3_DATA_H Register

Addr: 0x9C

Bit

7:0

Bit Name

CH3_DATA_H

CH3_DATA_H

Default

0

Access Bit Description

R CH3 ADC data

– high byte

AS7341

Register Description

CH4_DATA Register (Address 0x9D/0x9E)

Figure 78:

CH4_DATA_L Register

Addr: 0x9D

Bit

7:0

Bit Name

CH4_DATA_L

CH4_DATA_L

Default

0

Access Bit Description

R CH4 ADC data

– low byte

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 51

Document Feedback

Figure 79:

CH4_DATA_H Register

Addr: 0x9E

Bit

7:0

Bit Name

CH4_DATA_H

CH4_DATA_H

Default

0

Access Bit Description

R CH4 ADC data

– high byte

CH5_DATA Register (Address 0x9F/0xA0)

Figure 80:

CH5_DATA_L Register

Addr: 0x9F

Bit

7:0

Bit Name

CH5_DATA_L

CH5_DATA_L

Default

0

Access Bit Description

R CH5 ADC data

– low byte

Figure 81:

CH5_DATA_H Register

Addr: 0xA0

Bit

7:0

Bit Name

CH5_DATA_H

CH5_DATA_H

Default

0

Access Bit Description

R CH5 ADC data

– high byte

AS7341

Register Description

10.2.8 Miscellaneous Configuration

CFG0 Register (Address 0xA9)

Figure 82:

CFG 0 Register

Addr: 0xA9

Bit

7:6

Bit Name

reserved

CFG0

Default

0

5 LOW_POWER 0

Access Bit Description

RW reserved

Low Power Idle.

When asserted, the device will automatically run in a low power mode whenever all functions are in wait states or disabled.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 52

Document Feedback

AS7341

Register Description

Addr: 0xA9

Bit

4

3

2

1:0

Bit Name

REG_BANK reserved

WLONG reserved

CFG3 Register (Address 0xAC)

Figure 83:

CFG 3 Register

Addr: 0xAC

Bit

7:5

Bit Name

reserved

CFG3

Default

0

4

3:0

SAI reserved

0

0

0

CFG0

Default

0

Access Bit Description

RW

RW

Register Bank Access

0: Register access to register 0x80 and above

1: Register access to register 0x60 to 0x74

Note: Bit needs to be set to access registers 0x60 to

0x74. If registers 0x80 and above needs to be accessed bit needs to be set to “0”. reserved

Trigger Long.

Increases the WTIME setting by a factor of 16. reserved

0

0xC

Access Bit Description

RW reserved

Sleep after interrupt.

If set, the oscillator is turned off whenever an interrupt is active. SAI_ACTIVE is set in this event.

To activate the oscillator again, clear all interrupts and clear the SAI_ACTIVE bit. reserved

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 53

Document Feedback

CFG6 Register (Address 0xAF)

Figure 84:

CFG 6 Register

Addr: 0xAF

Bit Bit Name

CFG6

Default

4:3 SMUX_CMD 2

AS7341

Register Description

Access Bit Description

RW

SMUX command.

Selects the SMUX command to execute when setting SMUXEN gets set. Do not change during ongoing SMUX operation.

VALUE

0

SMUX_CMD

ROM code initialization of SMUX

1

2

3

Read SMUX configuration to RAM from SMUX chain

Write SMUX configuration from

RAM to SMUX chain

Reserved, do not use

CFG9 Register (Address 0xB2)

Figure 85:

CFG 9 Register

5

4

3:0

Addr: 0xB2

Bit

7

Bit Name

reserved

6 SIEN_FD reserved

SIEN_SMUX reserved

0

CFG9

Default

0

0

Access Bit Description

RW

RW reserved

System Interrupt Flicker Detection.

Enables system interrupt when flicker detection status change has occurred. reserved

System Interrupt SMUX Operation.

Enables system interrupt when SMUX command has finished reserved

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 54

Document Feedback

PERS Register (Address 0xBD)

Figure 86:

PERS Register

Addr: 0xBD

Bit

7:4

Bit Name

reserved

PERS

Default

0

3:0 APERS 0

AS7341

Register Description

Access Bit Description

RW

4

5

…

14

15

1

2

3 reserved

Spectral Interrupt Persistence.

Defines a filter for the number of consecutive occurrences that spectral data must remain outside the threshold range between SP_TH_L and

SP_TH_H before an interrupt is generated. The spectral data channel used for the persistence filter is set by SP_TH_CHANNEL. Any sample that is inside the threshold range resets the counter to 0.

VALUE CHANNEL

0

2

3

Every spectral cycle generates an interrupt

1

5

10

5 x (APERS

– 3)

55

60

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 55

Document Feedback

AS7341

Register Description

10.2.9 FIFO Buffer Data and Status

The FIFO buffer is used to poll spectral data with fewer I²C read and write transactions. The FIFO buffer is 256 bytes of RAM containing 128 two-byte datasets. If the FIFO overflows (i.e. 129 datasets before host reads data from the FIFO buffer), an overflow flag will be set and new data will be lost.

The Host acquires data by reading addresses: 0xFE

– 0xFF. The register address pointer automatically wraps from 0xFF to 0xFE as data are read. Data can be read one byte at a time or in blocks, (there is no block-read length limit). When reading single bytes, the internal FIFO read pointer and the FIFO Buffer Level, FIFO_LVL, are updated each time register 0xFF is read. For block-reads, the internal FIFO read pointer and the FIFO Buffer Level, FIFO_LVL update for each two-byte entry. If the FIFO continues to be accessed after FIFO_LVL = 0, the device will return 0 for all data. The FINT interrupt indicates when there is valid data in the FIFO buffer. The amount of unread data is indicated by the FIFO_LVL.

FIFO_MAP Register (Address 0xFC)

Figure 87:

FIFO_MAP Register

Addr: 0xFC

Bit

7

6

5

4

3

2

1

0

Bit Name

reserved

FIFO_MAP

Default

0

FIFO_WRITE_CH5_DATA 0

FIFO_WRITE_CH4_DATA 0

FIFO_WRITE_CH3_DATA 0

FIFO_WRITE_CH2_DATA 0

FIFO_WRITE_CH1_DATA 0

FIFO_WRITE_CH0_DATA 0

FIFO_WRITE_ASTATUS 0

Access Bit Description

RW

RW

RW

RW

RW

RW

RW reserved

FIFO write CH5 Data.

If set, CH5 data is written to the FIFO Buffer. (two bytes per sample)

Note: If flicker detection is enabled, this bit is ignored. Refer to register 0xD7 for FDEN=”1”.

FIFO write CH4 Data.

If set, CH4 data is written to the FIFO Buffer. (two bytes per sample)

FIFO write CH3 Data.

If set, CH3 data is written to the FIFO Buffer. (two bytes per sample)

FIFO write CH2 Data.

If set, CH2 data is written to the FIFO Buffer. (two bytes per sample)

FIFO write CH1 Data.

If set, CH1 data is written to the FIFO Buffer. (two bytes per sample)

FIFO write CH0 Data.

If set, CH0 data is written to the FIFO Buffer. (two bytes per sample)

FIFO write Status.

If set, ASTATUS (one byte per sample) is written to the FIFO Buffer.

In case SP_AGC_ENABLE = 1, ASTATUS should be written to FIFO buffer.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 56

Document Feedback

FIFO_CFG0 Register (Address 0xD7)

Figure 88:

FIFO_CFG0 Register

Addr: 0xD7

Bit Bit Name

7

6:0

FIFO_WRITE_FD reserved

AS7341

Register Description

FIFO_CFG0

Default

0

0100001

Access Bit Description

R/W

FIFO write Flicker Detection

If set flicker raw data is written into FIFO (two bytes per sample)

Note: This bit is ignored if flicker detection is disabled. Refer to register 0xFC for FDEN=”0”.

Reserved, do not change

FIFO_LVL Register (Address 0xFD)

Figure 89:

FIFO_LVL Register

Addr: 0xFD

Bit Bit Name

7:0 FIFO_LVL

FIFO_LVL

Default

0

Access Bit Description

R

FIFO Buffer Level.

Indicates the number of entries (each are 2 bytes) available in the FIFO buffer waiting for readout. The

FIFO RAM is 256byte, the FIFO_LVL range is from 0 entries to 128 entries.

FDATA Register (Address 0xFE and 0xFF)

Figure 90:

FDATA Register

Addr: 0xFE

Bit

7:0

Bit Name

FDATA

FDATA

Default

0

Access Bit Description

R FIFO Buffer Data

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 57

Figure 91:

FDATA Register

Addr: 0xFF

Bit

15:8

Bit Name

FDATA

Document Feedback

FDATA

Default

0

Access Bit Description

R FIFO Buffer Data

AS7341

Register Description

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 58

Document Feedback

AS7341

Application Information

11 Application Information

Figure 92 shows an example how AS7341 can be utilized to interface to an external InGaAs

photodiode. GPIO2 is mapped to an internal ADC.

11.1 Schematic

Figure 92:

Application Example with External InGaAs Detector

MCU

2.7V–5.5V

Filter tuning

VCC

EN

LX

AS1340

FB

GND

25-40V

1.8V

1.8V

VDD

PGND

GND

AS7341

SCL

SDA

INT

8CH VIS

NIR/CLE AR

350-100 0nm sensor

GPIO

LDR

Temperature supervision ligh t in

UP-MIR

InGaAS-Anode light source

InGaAs sensor

1.55

–1.85µm NIR

C13272-02 light in reflective surface

LOW-MIR

CASE

InGaAS-Cathode

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 59

11.2 PCB Pad Layout

Figure 93:

Recommended PCB Pad Layout

Document Feedback

AS7341

Application Information

(1)

(2)

(3)

All dimensions are in millimeters.

Dimension tolerances are 0.05mm unless otherwise noted.

This drawing is subject to change without notice.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 60

Document Feedback

AS7341

Application Information

11.3 Application Optical Requirements

For optimal performance, an achromatic diffuser shall be placed above the device aperture. The recommended solution is a bulk diffuser that meets the minimum recommended scattering characteristic shown below. For more details refer to the optical design guide or contact ams.

Figure 94:

Diffuser Characteristics

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 61

Document Feedback

12 Package Drawings & Markings

Figure 95:

OLGA8 Package Outline Drawing

AS7341

Package Drawings & Markings

(1)

(2)

(3)

(4)

RoHS

All dimensions are in millimeters. Angles in degrees.

Dimensioning and tolerance conform to ASME Y14.5M-1994.

This package contains no lead (Pb).

This drawing is subject to change without notice.

Green

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 62

Document Feedback

13 Tape & Reel Information

Figure 96:

AS7341 OLGA8 Tape Dimensions

AS7341

Tape & Reel Information

(1)

(2)

All dimensions are in millimeters. Angles in degrees.

This drawing is subject to change without notice.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 63

Figure 97:

AS7341 OLGA8 Reel Dimensions

Document Feedback

AS7341

Tape & Reel Information

(1)

(2)

All dimensions are in millimeters. Angles in degrees.

This drawing is subject to change without notice.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 64

Document Feedback

AS7341

Soldering & Storage Information

14 Soldering & Storage Information

Figure 98:

Solder Reflow Profile Graph

Figure 99:

Solder Reflow Profile

Parameter

Average temperature gradient in preheating

Soak time

Time above 217 °C (T1)

Time above 230 °C (T2)

Time above T peak

– 10 °C (T3)

Peak temperature in reflow

Temperature gradient in cooling

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

Reference

t soak t

1 t

2 t

3

T peak

Device

2.5 °C/s

2 to 3 minutes

Max 60 s

Max 50 s

Max 10 s

260 °C

Max −5 °C/s

68

│ 65

Document Feedback

AS7341

Soldering & Storage Information

14.1 Storage Information

14.1.1 Moisture Sensitivity

Optical characteristics of the device can be adversely affected during the soldering process by the release and vaporization of moisture that has been previously absorbed into the package.

To ensure the package contains the smallest amount of absorbed moisture possible, each device is baked prior to being dry packed for shipping. Devices are dry packed in a sealed aluminized envelope called a moisture-barrier bag with silica gel to protect them from ambient moisture during shipping, handling, and storage before use.

14.1.2 Shelf Life

The calculated shelf life of the device in an unopened moisture barrier bag is 12 months from the date code on the bag when stored under the following conditions:

●

●

●

Shelf Life: 12 months

Ambient Temperature: <40°C

Relative Humidity: <90%

Rebaking of the devices will be required if the devices exceed the 12 month shelf life or the Humidity

Indicator Card shows that the devices were exposed to conditions beyond the allowable moisture region.

14.1.3 Floor Life

The module has been assigned a moisture sensitivity level of MSL 3. As a result, the floor life of devices removed from the moisture barrier bag is 168 hours from the time the bag was opened, provided that the devices are stored under the following conditions:

●

●

●

Floor Life: 168 hours

Ambient Temperature: <30°C

Relative Humidity: <60%

If the floor life or the temperature/humidity conditions have been exceeded, the devices must be rebaked prior to solder reflow or dry packing.

14.1.4 Rebaking Instructions

When the shelf life or floor life limits have been exceeded, rebake at 50°C for 12 hours.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 66

Document Feedback

AS7341

Revision Information

15 Revision Information

Document Status

Product Preview

Product Status Definition

Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice

Preliminary Datasheet Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice

Datasheet Production

Datasheet

(discontinued)

Discontinued

Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade

Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs

Changes from previous version to current revision v3-00 Page

-added figure 7 6

●

●

-fixed typos and document maintenance ALL

Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.

Correction of typographical errors is not explicitly mentioned.

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 67

Document Feedback

AS7341

Legal Information

16 Legal Information

Copyrights & Disclaimer

Copyright ams AG, Tobelbader Strasse 30, 8141 Premstaetten, Austria-Europe. Trademarks Registered. All rights reserved.

The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.

Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of

Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams

AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additi onal processing by ams AG for each application. This product is provided by ams AG “AS IS” and any express or implied warranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services.

RoHS Compliant & ams Green Statement

RoHS Compliant:

The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories plus additional 4 substance categories (per amendment EU 2015/863), including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes.

ams Green (RoHS compliant and no Sb/Br/Cl):

ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) and do not contain Chlorine (Cl not exceed 0.1% by weight in homogeneous material).

Important Information:

The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

Headquarters

ams AG

Tobelbader Strasse 30

8141 Premstaetten

Austria, Europe

Tel: +43 (0) 3136 500 0

Please visit our website at www.ams.com

Buy our products or get free samples online at www.ams.com/Products

Technical Support is available at www.ams.com/Technical-Support

Provide feedback about this document at www.ams.com/Document-Feedback

For sales offices, distributors and representatives go to www.ams.com/Contact

For further information and requests, e-mail us at [email protected]

Datasheet

• PUBLIC

DS000504

• v3-00 • 2020-Jun-25

68

│ 68