AMS AS3647 Datasheet
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Datasheet
AS3647/47B
1600mA High Current LED Flash Driver
1 General Description 2 Key Features
The AS3647/47B includes flash timeout, overvoltage, overtemperature, undervoltage and LED short circuit protection functions. A TXMASK/TORCH function reduces the flash current in case of parallel operation to the RF power amplifier and avoids a system shutdown.
Alternatively this pin can be used to directly operate the torch light directly.
The AS3647/47B is controlled by an I
2
C interface and has a hardware automatic shutdown if SCL=0 for
100ms. Therefore no additional enable input is required for shutting down of the device once the system shuts down.
High efficiency 4MHz fixed frequency DCDC Boost converter with soft start allows small coils
The AS3647/47B is an inductive high efficient DCDC step up converter with two current sinks. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sinks can operate in flash / torch / assist (=video) light modes.
- Stable even in coil current limit
LED current adjustable up to 1600mA
Protection functions:
I
Overvoltage and undervoltage Protection
2
PWM operation for lower output current for reliable audible noise
valid
Automatic Flash Timeout timer to protect the LED(s)
Overtemperature Protection
AG still
Available in tiny WL-CSP Packages, 13 balls 0.5mm pitch 2.25x1.5x0.6mm, 15 balls 0.4mm pitch
The AS3647/47B is available in a space-saving WL-
30ºC to +85ºC temperature range.
ams
Figure 1. Typical Operating Circuit
2.25x1.5x0.5mm package size
3 Applications
Flash/torch/videolight for smartphones, feature-phones,
content
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Technical
www.austriamicrosystems.com/AS3647
(ptr)
1.5-4 1 - 37
AS3647/47B
Datasheet, Confidential - P i n o u t
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View) AS3647
'
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Figure 3. Pin Assignments (Top View) AS3647B
ams
-
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-
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AS3647 still valid
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1 2
3 4
AS3647B
Technical
www.austriamicrosystems.com/AS3647 1.5-4 2 - 37
AS3647/47B
Datasheet, Confidential - P i n o u t
Pin Description
Table 1. Pin Description for AS3647
Pin Number
A1
A2
A3
B1
Pin Name
VOUT1
GND
LED_OUT1
SW1
Description
DCDC converter output capacitor - make a short connection to C
VOUT
/ VOUT2
Power and analog ground; make a short connection between both balls
Flash LED current sink
DCDC converter switching node - make a short connection to SW2 / coil L
DCDC
B2
C1
C2
C3
D1
D2
E1
E2
E3
Table 2. Pin Description for AS3647B
Pin Number
A1
A2
A3
B1
GND
VOUT2
SW2
LED_OUT2
SCL
VIN
SDA
STROBE
TXMASK/
TORCH
Pin Name
VOUT1
GND
LED_OUT1
VOUT2
Power and analog ground; make a short connection between both balls
DCDC converter output capacitor - make a short connection to C
VOUT
/ VOUT1
DCDC converter switching node - make a short connection to SW1 /coil L
Flash LED current sink
valid
serial clock input for I
2
C interface
Positive supply voltage input - connect to supply and make a short connection to input capacitor C
VIN
and to coil L
DCDC serial data input/output for I
2 and the flash driver
C interface (needs external pullup resistor)
AG
Function 2: Operate torch current level without using the I
still
2
C interface to operate the torch without need to start a camera processor (if the I
2
C is connected to the camera processor
ams
DCDC converter output capacitor - make a short connection to C
VOUT
/ VOUT2
Power ground; make a short connection between both balls
Flash LED current sink
Description content
DCDC converter output capacitor - make a short connection to C
VOUT
/ VOUT1
DCDC converter switching node - make a short connection to SW1 /coil L
DCDC
B2 SW2
Power ground; make a short connection between both balls
B3 GND
DCDC converter switching node - make a short connection to SW2 / coil L
DCDC
C1 SW1
DCDC converter switching node - make a short connection to SW3 /coil L
DCDC
C2 SW3
Flash LED current sink
C3 LED_OUT2
D1 SCL serial clock input for I
2
C interface
D2
D3
GNDA
VIN
Analog ground - internally connected to GND ball A2; for improving thermal performance connect to ground plane (optional)
Positive supply voltage input - connect to supply and make a short connection to input capacitor C
VIN
and to coil L
DCDC
E1 SDA serial data input/output for I
2
C interface (needs external pullup resistor) www.austriamicrosystems.com/AS3647 1.5-4 3 - 37
AS3647/47B
Datasheet, Confidential - P i n o u t
Table 2. Pin Description for AS3647B
Pin Number
E2
Pin Name
STROBE
E3
TXMASK/
TORCH
Description
Digital input with pulldown to control strobe time for flash function
Function 1: Connect to RF power amplifier enable signal - reduces currents during flash to avoid a system shutdown due to parallel operation of the RF PA and the flash driver
Function 2: Operate torch current level without using the I
2
C interface to operate the torch without need to start a camera processor (if the I
2
C is connected to the camera processor
AG still valid
Technical
www.austriamicrosystems.com/AS3647 1.5-4 4 - 37
AS3647/47B
Datasheet, Confidential - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
may cause permanent damage to the device. These are stress ratings only,
affect device reliability.
Table 3. Absolute Maximum Ratings
Comments Parameter
VIN to GND
Min
-0.3
Max
+7.0
Units
V
STROBE, TXMASK/TORCH, SCL, SDA to
GND
SW1/2/3, VOUT1/2, LED_OUT1/2 to GND
VOUT1/2 to SW1/2/3 voltage between 2xGND, GNDA pins
Input Pin Current without causing latchup
Continuous Power Dissipation (T
A
= +70ºC)
Continuous power dissipation
Continuous power dissipation derating factor
Electrostatic Discharge
ESD HBM pins LED_OUT1/2
3
-0.3
-0.3
-0.3
0.0
-100
VIN +
0.3
+7.0
0.0
+100
+I
IN
V
V
V
V mA
1230
16.7
mW
AG
±8000 V
Note:
max. +7V
SW1/2/3
valid
short connection recommended
Norm: EIA/JESD78
P
T
still
P
DERATE
2
Norm: JEDEC JESD22-A114F
ESD HBM
ESD CDM
ESD MM
Junction to ambient thermal resistance
ams
±2000
±500
±100
V
V Norm: JEDEC JESD 22-C101E
content
+150
V
ºC/W
ºC
Norm: JEDEC JESD 22-A115-B
Thermal Characteristics
Internally limited (overtemperature protection), max. 20000s
Junction Temperature
Storage Temperature Range -55 +125 ºC
Humidity
5 85
+260
%
ºC
Non condensing according to IPC/JEDEC J-STD-020 Body Temperature during Soldering
Represents a max. floor life time of unlimited
Moisture Sensitivity Level (MSL)
MSL 1
1. Depending on actual PCB layout and PCB used measured on demoboard; for peak power dissipation during flashing see document 'AS3647/47B Thermal Measurements'
2. P
DERATE
derating factor changes the total continuous power dissipation (P
T
) if the ambient temperature is not
70ºC. Therefore for e.g. T
AMB
=85ºC calculate P
T
at 85ºC = P
T
- P
DERATE
* (85ºC - 70ºC)
Technical
VOUT
connected to VOUT1/2 and GND; both GND www.austriamicrosystems.com/AS3647 1.5-4 5 - 37
AS3647/47B
Datasheet, Confidential - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
VIN
= +2.7V to +4.4V, T
AMB
= -30ºC to +85ºC, unless otherwise specified. Typical values are at V
VIN
= +3.7V, T
AMB
=
+25ºC, unless otherwise specified.
Table 4. Electrical Characteristics
Condition Min Typ Max Unit Symbol Parameter
General Operating Conditions
V
VIN
Supply Voltage
V
VINREDUCE
D_FUNC
I
SHUTDOWN
Shutdown Current
I
STANBY
Supply Voltage
Standby Current pin VIN
AS3647/47B functionally working, but not all parameters fulfilled
TXMASK/TORCH=L, SCL=SDA=0V,
V
VIN
<3.7V
interface active, TXMASK/TORCH=L,
V
VIN
<3.7V
1
2.7
3.7
4.4
T
AMB
Operating
Temperature
Eta
Application Efficiency
(DCDC and current sink)
DCDC Step Up Converter
V
V
VOUT5V
R
VOUT
PMOS
DCDC Boost output
Voltage
(pin VOUT1/2)
DCDC Boost output
Voltage
(pin VOUT1/2)
On-resistance
R
NMOS
On-resistance
L
COIL
=0.6µH@3A, L
ESR
=60m
,
LED_OUT1,2=1300mA
2
, t
FLASH
<300ms
AG
constant voltage mode operation
5.0
f
CLK
Operating Frequency
Current Sinks
V
LED
LED forward voltage
I
LED_OUT
LED_OUT1/2 current sinks output combined
DCDC internal NMOS switch
All internal timings are derived from this
content
single LED
I
LED_OUT
I
LED_OUT
RAMP
LED_OUT1/2 current sink accuracy
LED_OUT1/2 ramp time
I
LED_OUT
>=800mA or I
LED_OUT
<500mA
0ºC < T
J
< 100ºC
500mA<I
LED_OUT
<800mA, 0ºC < T
J
< 100ºC
Ramp-up During startup
Ramp-down
I
LED_OUT
= 1000mA, BW=20MHz
I
LED_OUT
RIPPLE
LED_OUT current ripple
V
ILED_COMP
V
LOW_VDS
LED_OUT current sink voltage compliance
Comparator Low VDS
Minimum voltage between pin LED_OUT1/2 and GND for operation of the current sink
V
HIGH_VDS
Comparator High VDS low vds and high vds comparator - see
I
LEAK
_
LED_OUT
LED_OUT1/2
Leakage Current
1MHz Operating Mode Switching on page 13
Pins LED_OUT1 and LED_OUT2
Protection and Fault Detection Functions
70
70
+5
250 1000
500 1000 m
-7.5% 4.0
+7.5% MHz
2.8
0
-7
-5
-1.0
3.5
20
325
900
320
4.2
V
1600 mA
+7
0.0
+1.0
m
% mA
PP mV mV
µA
V
%
µs
µs
V
2.5
4.4
0.6
1.0
2.7
5.5
2.0
10
-30
2.8
25
84
85
still
5.5
%
V
µA
µA
ºC
valid
V www.austriamicrosystems.com/AS3647 1.5-4 6 - 37
AS3647/47B
Datasheet, Confidential - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Symbol
V
VOUTMAX
I
LIMIT
Parameter
V
VOUT
overvoltage protection
Current Limit for coil
L
DCDC
(Pin SW) measured at 40%
PWM duty cycle
3
Condition
DCDC Converter Overvoltage Protection default value
Min
5.0
=00b 1.8
=01b 2.25
=10b
2.7
Typ Max Unit
5.3
5.6
2.0
2.23
2.5
2.78
3.0
3.34
V
A
V
LEDSHORT
T
OVTEMP
T
OVTEMPHY
ST t
FLASHTIMEO
UT
V
UVLO maximum 40000s lifetime operation in overcurrent limit
Flash LED short circuit detection voltage
Overtemperature
Protection
Overtemperature
Hysteresis
Flash Timeout Timer
Undervoltage Lockout
3.15
Voltage measured between pins VOUT1,2 and
LED_OUT1,2
Junction temperature
Can be adjusted with register
accuracy
Falling V
Rising V
AG
VIN
3.5
1.0
144
3.9
2.25
V
UVLO
+0.05
2
-7.5
5
still
ºC ms
2.4
V
UVLO
+0.1
2.5
V
UVLO
+0.15
%
V
V
V
ºC
valid
Digital Interface
V
V
V
V
IH
IL
IHFLASH
ILFLASH
High Level Input
Voltage
Low Level Input
Voltage
High Level Input
Voltage
Low Level Input
Voltage
I
V
LEAK
I
OL
PD
Low Level Output
Voltage
Leakage current
Pulldown current to
GND
5
Pins SCL, SDA.
Pin TXMASK/TORCH in external torch mode
=10)
Pin STROBE.
Pin TXMASK/TORCH for TxMask mode
4 pin SDA, I
OL
=3mA
1.26
0.0
0.7
0.0
Pins SCL, SDA
Pins TORCH, STROBE and TXMASK/TORCH t
DEBTORCH
TORCH debounce time t
TIMEOUT
SCL timeout
In indicator, assist or flash mode, if SCL is low longer than this timeout, the AS3647/47B automatically enters shutdown mode
I
2
C mode timings - see Figure 4 on page 9
f
SCLK
Technical
t
BUF
Bus Free Time
Between a STOP and
START Condition
-1.0
6.3
35
1/ t
TIMEO
UT
1.3
0.0
+1.0
36
9
V
VIN
0.54
V
VIN
0.54
V
V
V
V
0.3 V
11.7
100
400
µA
µA ms ms kHz
µs www.austriamicrosystems.com/AS3647 1.5-4 7 - 37
AS3647/47B
Datasheet, Confidential - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Symbol
t t t t t
HD:STA t t
LOW
HIGH
SU:STA
HD:DAT
SU:DAT
SU:STO
C
C t t
R
F
B
I/O
Parameter
Hold Time (Repeated)
START Condition
6
LOW Period of SCL
Clock
HIGH Period of SCL
Clock
Setup Time for a
Repeated START
Condition
Data Hold Time
7
Data Setup Time
8
Rise Time of Both
SDA and SCL Signals
Fall Time of Both SDA and SCL Signals
Setup Time for STOP
Condition
Capacitive Load for
Each Bus Line
I/O Capacitance
(SDA, SCL)
C
B
Condition Min
0.6
1.3
0.6
Typ Max Unit
µs
µs
µs
0.6
0
100
0.9
300
20 +
0.1C
B
20 +
0.1C
B
0.6
300
still
400 ns
µs
µs
µs ns ns
valid
10
1. For VBAT=4.5V, SCL=1.8V, SDA=1.8V maximum I
STANBY
is <16µA.
2. To improve efficiency at low output currents, the active part of the internal switching transistor PMOS is reduced
3. Due to slope compensation of the current limit, I
4. The logic input levels V
IH
and V
IL
ams
6. After this period, the first clock pulse is generated.
7. A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IHMIN
of the
SCL signal) to bridge the undefined region of the falling edge of SCL.
.
8. A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
= to 250ns must then be met. This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line t
R
max + t
SU:DAT
= 1000 + 250 = 1250ns before the SCL line is released.
pF pF
Technical
www.austriamicrosystems.com/AS3647 1.5-4 8 - 37
AS3647/47B
Datasheet, Confidential - E l e c t r i c a l C h a r a c t e r i s t i c s
Timing Diagrams
Figure 4. I
2
C mode Timing Diagram
SDA t
BUF t
LOW t
R t
F
SCL
STOP START t
HD:STA t
HD:DAT t
HIGH t
SU:DAT
AG
t
SU:STA
REPEATED
START t
HD:STA
valid
Technical
www.austriamicrosystems.com/AS3647 1.5-4 9 - 37
AS3647/47B
Datasheet, Confidential - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
V
VIN
= 3.7V, T
A
= +25ºC (unless otherwise specified), LED: Osram Phaser 2 (VF
LED
=3.8V at 1A)
Figure 5. DCDC Efficiency vs. V
VIN
100
Figure 6. Application Efficiency (P
LED
/P
VIN
) vs. V
VIN
90
95
85
90
%
80
A
85
75
70
60
2,8
4
3,5
3
2,5
2
1,5
1
0,5
0
2,8
80
%
75
70
65
65
3,2
IOUT = 1300mA/1 LED/ 1/4MHz on
IOUT = 1000mA/1 LED
3,6 4 4,4
Input Voltage (V)
4,8
Figure 7. Battery Current vs. V
VIN
IOUT = 1600mA/1 LED
IOUT = 1300mA/1 LED
5,2
5,2
IOUT = 1000mA/1 LED
60
100
3,6 4
Input Voltage (V)
2,8 3,2
AG
95
IOUT = 1300mA/1 LED/ 1/4MHz on
3,6 4 4,4
90
IOUT = 1000mA/1 LED
ams
%
80
content
60
4,8 5,2
85
IOUT = 300mA/1 LEDs
DCDC Efficiency
IOUT = 300mA/1 LEDs
Application Efficiency
2,8 3,0 3,2 3,4 3,6 3,8 4,0 4,2 4,4
Input Voltage (V)
Input Voltage (V)
3,2
IOUT = 1600mA/1 LED
IOUT = 1300mA/1 LED
IOUT = 1600mA/1 LED
IOUT = 1300mA/1 LED
IOUT = 1300mA/1 LED/ 1/4MHz on
valid
Figure 9. I
LED
Startup (I
LED_OUT
=1.0A) Figure 10. I
VIN
, I
LED
Startup (I
LED_OUT
=800mA)
Technical
www.austriamicrosystems.com/AS3647 1.5-4 10 - 37
AS3647/47B
Datasheet, Confidential - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 11. I
LED
Startup (I
LED_OUT
=60mA) Figure 12. VOUT / I
LED_OUT
ripple, I
LED_OUT
= 1.0A
Figure 13. I
LED
Rampdown (I
LED_OUT
=1.0A) Figure 14. I
LED_OUT
vs. T
AMB
AG
61
ams
mA
60
59
-30 -10 10 30 50
Ambient Temperature (C)
still valid
70
Figure 15. Oscillator frequency f
CLK
vs. T
AMB
4.2
4.1
MHz
4.0
3.9
3.8
Technical
-30 -10 10 30 50 70
Ambient Temperature (C) www.austriamicrosystems.com/AS3647
Figure 16. Flash Timeout
1.5-4 11 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
8 Detailed Description
The AS3647/47B is a high performance DCDC step up converter with internal PMOS and NMOS switches. Its output is connected to one flash LED with an internal current sink. The device is controlled by the pins SDA and SCL in I mode.
2
C
The actual operating mode like standby, assist light, indicator or flash mode, can then be chosen by the interface. If not in standby mode, the device automatically enters shutdown mode by keeping SCL low for more than t
TIMEOUT
1
.
The AS3647/47B includes a fixed frequency DCDC step-up with accurate startup control. Together with the current sink (on LED_OUT1/2) it includes several protection and safety functions.
Internal Circuit Diagram
Figure 17. Internal circuit Diagram
+,
.
)
!
+
6
AS3647/47B
1
'
/
'%*
'+,
1
1
"$
#"
"
,0+'+,
ams
'0%3&
'%
*
,0+
%
valid still
'+,'
!
!
,*&&-,
!
/&
5
'
"
!
"
!
'
!
$
&
'
&
2
.)
-
%/
+,*
#
Softstart / Soft ramp down
During startup and ramp down the LED current is smoothly ramped up and ramped down. If the DCDC converter goes out of regulation (measured by monitoring the voltage across the current sinks), the ramp up is temporarily stopped in order for the DCDC to return to regulation
2
.
Technical
1. Following registers are reset to their default value if the timeout expires:
=00,
28) to allow the camera processor to adopt to the actual operating conditions.
www.austriamicrosystems.com/AS3647 1.5-4 12 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
4MHz/1MHz Operating Mode Switching
If freq_switch_on (see page 28)
=1 and in flash and assist light mode (indicator mode or low current mode using PWM mode -see
mode_setting (page 26) - always will use pulseskip) if
>=40h , the DCDC converter always operates in PWM mode (exception: PFM mode is allowed during startup) to reduce EMI in EMI sensitive systems. For flash and assist light mode and high duty cycles close to 100% on-time (maximum duty cycle) of the PMOS, the DCDC converter can switch into a 1MHz operating mode and maximum duty cycle to improve efficiency for this load condition
3
.
The DCDC converter returns back to its normal 4MHz operating frequency when load or supply conditions change.
Due to this switching between two fixed frequencies the noise spectrum of the system is exactly defined and predictable. If improved efficiency is required, the fixed switching between 1MHz / 4MHz can be disabled by
(see page 28) =0. In this case pulseskip will be used.
The internal circuit for switching between these two frequencies is shown in
:
Figure 18. Internal circuit of 4MHz/1Mhz selection
"
!
%!'/
&%
"
'())
* +,-
AS3647/47B
$.1
$2#0
AG
7
$.!'/
still
#0$.!#0$./
valid
Note:
For simplicity
ams
register bit is set, which can be readout by the I
2
C interface. The fault bits are automatically cleared by a I
2
C readout of the fault register. Additionally the DCDC is stopped and the current sinks are disabled
4
by resetting
out_on =0, mode_setting =00 and
Overvoltage Protection
In case of no or a broken LED(s) at the pin LED_OUT1/2 and an enabled DCDC converter, the voltage on VOUT1/2 rises until it reaches V
VOUTMAX
(overvoltage condition) and the voltage across the current source is below low_vds
5
.,
6
.
4. Applies for all faults except
5. If overvoltage is reached, but none of the low_vds comparator(s) triggers, VOUT1/2 is still regulated below
V
VOUTMAX
.
6. In constant voltage mode (5V generation, register bit
=1) this fault is disabled.
www.austriamicrosystems.com/AS3647 1.5-4 13 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Short Circuit Protection
After the startup of the DCDC converter, the voltage on LED_OUT1/2 is continuously monitored and compared against
V
LEDSHORT
if the LED current is above 25mA
7
). If the voltage across the LED (VF
LED
= VOUT1/2-
LED_OUT1/2) stays below V
LEDSHORT
, the DCDC is stopped (as a shorted LED is assumed), the current sinks are dis-
abled and the bit fault_led_short (see page 27) is set.
Figure 19. Short LED detection
!
!$
%
&
!
' driver is automatically re-enabled
8
OVTEMP
-T
OVTEMPHYST
.
OVTEMP
, the
TXMASK event occurred
valid
!"!##
Overtemperature Protection
still
is set. The
If during flash, TXMASK current reduction is enabled (see
=01) and a TXMASK event happened (pin TXMASK/TORCH=1), the fault register bit
is set.
Flash Timeout
= 1 and
set.
= 1, see
ams
), the DCDC is stopped and the flash current sinks (on pin LED_OUT1/2) are disabled and
If the flash duration is defined by the timeout timer itself (
is set after the flash has been finished.
), the register
is
Supply undervoltage Protection
If the voltage on the pin VIN (=battery voltage) is or falls below V
UVLO
, the AS3647/47B is kept in shutdown state and all registers are set to their default state.
Wakeup Circuit - Power off detection
=1, if SCL is L for more than t
TIMEOUT
, shutdown mode is automatically entered. This feature automatically detects a power-off of the controlling circuit driving SCL and SDA (VDD_I/F goes to 0V e.g. due to a low power condition of the driving circuit)
- the internal circuit is shown in Figure 20 :
Technical
7. To avoid errors in short LED detection for LEDs with a high leakage current
8. In constant voltage mode ( const_v_mode
=1) the DCDC will not be automatically re-enabled.
www.austriamicrosystems.com/AS3647 1.5-4 14 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Figure 20. Device Shutdown and Wakeup
"&
"#!$%"
!!"
In shutdown mode once pin SCL goes high for the first time, the internal counter shown in Figure 20
is immediately the I
2
!!"
$
'()(*
)))(
+ &+
valid
AS3647/47B
C bus. Therefore no additional action is required to leave the shutdown mode and start I
2
C communication.
Purpose of this circuit
The purpose of this circuit is an additional security mechanism.
AG
Assume the user programmed torch or indicator operation (there is no timeout for these operating modes) and the battery slowly drops below the undervoltage limit of the system. The processor would get an reset by the PMIC and the
LDO operating VDD_I/F is switched off, but the processor might not have been able to switch-off the torch/indicator
ams
schmitt trigger input buffers connected to SCL and SDA in e.g. 1.8V) to the supply voltage on VIN (e.g. 3.7V). If the AS3647/47B is driven with digital levels close to 0V/VIN, the current consumption for standby mode is identical to shutdown mode.
Operating Mode and Currents
The output currents and operating mode are selected according to the following table:
Table 5. Operating Mode and current settings
AS3647/47B configuration
SCL low for t
TIME
OUT
1
X X
X
X
Condition
if previous operating mode was indicator, assist light or flash mode
operating mode and currents
LED_OUT1/2 output current
Mode
shutdown all registers are reset to their default values
0 www.austriamicrosystems.com/AS3647 1.5-4 15 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Table 5. Operating Mode and current settings (Continued)
X
X
0
1
X
X
X
AS3647/47B configuration mode_ setting
(see page
26) out_on
(see page
26)
10, 01 or 11
0
Condition
X
X
00 X
not 10
=10
X
X
X
01
10
1
1
=10
operating mode and currents
LED_OUT1/2 output current
Mode
standby 0 external torch mode indicator mode or low current pwm mode
3
LED current is defined by the 7LSB
2
bits of
valid
LED current is defined by the 6LSB bits (bits
(1/
LED current is defined by the 7LSB
2
bits (6...0)
X X
X 0->1
X 1
11 1
= 0
= 1 and
ams
flash mode; flash duration defined by
flash mode; flash duration defined by
STROBE input; timeout
LED current is defined
current can be reduced
below
1. SCL low for t
TIMEOUT
and operating mode is indicator, assist or flash mode then shutdown mode is entered.
2. The MSB bit of this register not used to protect the LED; therefore the maximum assist / torch light current = half the maximum flash current
3. The low current mode is a general purpose PWM mode to drive less current through the LED in average, but keep the actual pulsed current in a range where the light output from the LED is still specified. As only the 6
LSBs of
are used the maximum current is limited to 1/4 of the maximum flash current.
Flash Current Reductions
TXMASK
Usually the flash current is defined by the register
. If the TXMASK/TORCH input is used and (configured by
ext_torch_on =01), the flash current is reduced to flash_txmask_current
if TXMASK/TORCH=1.
Technical
the AS3647/47B monitors the battery voltage and keeps it above
Before a flash is started the voltage on VIN is measured. If the voltage is below the setting of
(see page 27) is set and the flash is disabled (driver stays in shutdown) if
=1. The flash current is reduced to
www.austriamicrosystems.com/AS3647 1.5-4 16 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
During flash, if the voltage on VIN drops below the threshold defined by
, the flash current is reduced (or
ramping of the current is stopped during flash current startup) and fault_uvlo
is set. The timing for the reduction of the current is 8µs/LSB current change.
During the flash pulse the actual used current can be readout by the register led_current_actual .
camera sensitivity (gain or iso-settings) for the subsequent flash pulse (e.g. when using a pre-flash and a main flash pulse).
The internal circuit for low voltage current reductions are shown in Figure 21
:
Figure 21. Low Voltage current Reduction Internal Circuit
(.
!" !#$
%"& '
)
(
(
*
+
still valid
(
)
-
AG
)
&
AS3647/47B
The diagnostic flash is initiated by the processor. After this diagnostic flash, the determined maximum flash current can be read back through the I
2
C interface from register led_current_min (see page 28)
and used for the setting for the main flash. Therefore the current in the main-flash is constant and additionally the camera system can use this current for picture quality adjustments - the waveforms for this concept are shown in
Technical
www.austriamicrosystems.com/AS3647 1.5-4 17 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Figure 22. Low Voltage current Reduction Waveform with diagnostic-Flash and Main-Flash Phase
&'
( " #
!
"#
!
$
% %%
valid
setting compared to the main flash as shown in Figure 23
:
AG
&'
(
%%
%%
!
"#
!
content
$
% %%
.
Flash Strobe Timings
The flash timing are defined as follows:
1. Flash duration defined by register
flash_timeout and flash is started immediately when this mode is selected by
the I
2
= 0, start the flash by setting out_on = 1
2. Flash duration defined by register flash_timeout
and flash started with a rising edge on pin STROBE
and Figure 34 ):
set strobe_on = 1 and strobe_type
= 1 www.austriamicrosystems.com/AS3647 1.5-4 18 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Figure 24. AS3647/47B flash duration defined by flash_timeout
without using STROBE input
!
"# $
&
!"
Figure 25. AS3647/47B flash duration defined by flash_timeout
, starting flash with STROBE rising edge
#$ %
AG still
Figure 26. AS3647/47B flash duration and start defined by STROBE, limited by
; timer not expired
valid
'
!"
$ %
!"
content
Figure 27. AS3647/47B flash duration and start defined by STROBE, limited by
; timer expired
%
!
"
#$
Technical
www.austriamicrosystems.com/AS3647 1.5-4 19 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
I
2
C Serial Data Bus
The AS3647/47B supports the I
2
C bus protocol. A device that sends data onto the bus is defined as a transmitter and a device receiving data as a receiver. The device that controls the message is called a master. The devices that are controlled by the master are referred to as slaves. A master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions must control the bus. The AS3647/47B operates as a slave on the I
2
C bus. Within the bus specifications a standard mode (100kHz maximum clock rate) and a fast mode
(400kHz maximum clock rate) are defined. The AS3647/47B works in both modes. Connections to the bus are made through the open-drain I/O lines SDA and SCL.
The following bus protocol has been defined ( Figure 28 ):
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH are interpreted as control signals.
Accordingly, the following bus conditions have been defined:
Bus Not Busy
valid
Both data and clock lines remain HIGH.
Start Data Transfer
A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a START condition.
Stop Data Transfer
Data Valid
AG still
The state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed during the LOW period of the clock signal.
There is one clock pulse per bit of data.
information is transferred byte-wise and each receiver acknowledges with a ninth bit.
Acknowledge
ams
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the
SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of course, setup and hold times must be taken into account. A master must signal an end of data to the slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to enable the master to generate the STOP condition.
Technical
www.austriamicrosystems.com/AS3647 1.5-4 20 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Figure 28. Data Transfer on I
2
C Serial Bus
SDA
MSB
SLAVE
ADDRESS
R/W
DIRECTION
BIT
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
SCL
1 2
6 7
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
8
9 1
2 3-7 8 9
ACK
STOP CONDITION
OR REPEATED
START CONDITION
valid
START
CONDITION
REPEATED IF
MORE BYTES ARE
TRANSFERRED
still
1.
Data transfer from a master transmitter to a slave receiver.
The first byte transmitted by the master is the slave address. Next follows a number of data bytes. The slave returns an acknowledge bit after each received byte. Data is transferred with the most significant bit (MSB) first.
2.
Data transfer from a slave transmitter to a master receiver.
The master transmits the first byte (the slave
1. address). The slave then returns an acknowledge bit, followed by the slave transmitting a number of data bytes. The master returns an acknowledge bit after all received bytes other than the last byte. At the end of the
ams
The AS3647/47B can operate in the following two modes:
Slave Receiver Mode (Write Mode):
ning and end of a serial transfer. Address recognition is performed by hardware after reception of the slave address and direction bit
. The slave address byte is the first byte received after the master generates the START condition. The slave address byte contains the 7-bit AS3647/47B address, which is
0110000, followed by the direction bit (R/W), which, for a write, is 0.
9
After receiving and decoding the slave address byte the device outputs an acknowledge on the SDA line. After the AS3647/47B acknowledges the slave address + write bit, the master transmits a register address to the AS3647/47B. This sets the register pointer on the AS3647/47B. The master may then transmit zero or more bytes of data, with the AS3647/47B acknowledging each byte received. The address pointer will increment after each data byte is transferred. The master generates a STOP condition to terminate the data write.
2.
Slave Transmitter Mode (Read Mode):
The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the AS3647/47B while the serial clock is input on SCL. START and STOP conditions are recognized as the beginning and end of a serial transfer (
Figure 30 and Figure 31 ). The slave address byte is the
Technical
10
After
AS3647/47B then begins to transmit data starting with the register address pointed to by the register pointer. If
9. The address for writing to the AS3647/47B is 60h = 01100000b
10.The address for read mode from the AS3647/47B is 61h = 01100001b www.austriamicrosystems.com/AS3647 1.5-4 21 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n the register pointer is not written to before the initiation of a read mode the first address that is read is the last one stored in the register pointer. The AS3647/47B must receive a “not acknowledge” to end a read.
Figure 29. Data Write - Slave Receiver Mode
<Data(n+X)>
<Slave Address> <Word Address (n)> <Data(n)> <Data(n+1)>
S 0110000 0 A XXXXXXXX A XXXXXXXX A XXXXXXXX A XXXXXXXX A P
S - Start
A - Acknowledge (ACK)
P - Stop
Data Transferred
(X + 1 Bytes + Acknowledge)
Figure 30. Data Read (from Current Pointer Location) - Slave Transmitter Mode
AG
<Data(n+2)> <Slave Address> <Data(n)> <Data(n+1)>
S 0110000 1 A XXXXXXXX A XXXXXXXX A XXXXXXXX A
<Data(n+X)>
S - Start
A - Acknowledge (ACK)
P - Stop
NA - Not Acknowledge (NACK)
ams
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
Figure 31. Data Read (Write Pointer, Then Read) - Slave Receive and Transmit
XXXXXXXX
still valid
NA P
S 0110000 0 A
<Word Address (n)>
XXXXXXXX A Sr
<Slave Address>
0110000 1 A
<Data(n)> <Data(n+1)>
XXXXXXXX
S - Start
Sr - Repeated Start
A
A - Acknowledge (ACK)
P - Stop
XXXXXXXX
Technical
A
<Data(n+2)>
XXXXXXXX A
<Data(n+X)>
XXXXXXXX
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
NA P www.austriamicrosystems.com/AS3647 1.5-4 22 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Register Description
Table 6.
Register
Bit
2:0
7:3
Addr: 0
Bit Name
version fixed_id
Table 7.
Bit
Addr: 1
Bit Name
7:0 led_current
Default Access
Xh R
Register
This register has a fixed ID
Description
AS3647/47B chip version number
10110b R
Default Access
This is a fixed identification (e.g. to verify the I
2 communication)
C
Register
This register defines design versions
Description valid
Define the current on pin LED_OUT1/2 (combined; each current sink has identical currents)
0h
1h
Caution:
assist mode uses bits 6:0 of this current setting
(max. half of full current setting)
AG
0mA
6.3mA
still
5:0 of this current setting (max. 1/4 of full
2h
...
R/W
7Fh
...
9Ch
...
FEh
FFh
12.5mA
...
393.3mA (maximum current for indicator or low current pwm mode,
...
796.9mA (maximum current for assist light mode,
=10)
...
979mA - default setting
...
1593.7mA
1600mA
Technical
www.austriamicrosystems.com/AS3647 1.5-4 23 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Table 9.
Register
Bit
1:0
3:2
7:4
Addr: 3
Bit Name
ext_torch_on coil_peak flash_txmask_current
2
Register
This register defines the TXMask settings and coil peak current
Default Access Description
Defines operating mode for input pin TXMASK/TORCH
00 pin has no effect
00
10
R/W
R/W
01 txmask-mode; during flash if TXMASK/TORCH=1, the
LED current is set to flash_txmask_current
10
11
00
01
10
11 external torch mode: if TXMASK/TORCH=1 and
=00, the AS3647/47B is set into external torch mode (LED current is defined by the 7LSB
1 of
) don’t use
valid
Defines the maximum coil current (parameter I
LIMIT
)
I
I
I
LIMIT
= 2.0A
LIMIT
LIMIT
I
LIMIT
= 3.5A
0mA
still
Define the current on pin LED_OUT1/2 in flash mode if
ext_torch_on =01 and TXMASK/TORCH=1
0h
AG ams
6h R/W
1h
2h
3h
4h
5h
7h
8h
100mA
201mA
301mA
402mA
502mA
602mA - default
703mA
803mA
Dh
Eh
Fh
9h
Ah
Bh
Ch
904mA
1004mA
1104mA
1205mA
1305mA
1405mA
1506mA
2.
flash current www.austriamicrosystems.com/AS3647 1.5-4 24 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Table 10. Low Voltage Register
Bit
Addr: 4
Bit Name
2:0
5:3
6 vin_low_v_run vin_low_v vin_low_v_shutdown
0
0
This register defines the operating mode with low battery voltages
Default Access Description
4h R/W
0h
3h
Voltage level on VIN where current reduction triggers during operation
(see Current Reduction by VIN measurements in
Flash Mode on page 16) - only in flash mode; if VIN drops
below this voltage during current ramp up, the current ramp up is stopped; during operation the current is decreased until the voltage on VIN rises above this threshold -
is set
0h
1h
2h function is disabled
3.0V
3.07V
valid
3.14V
4h
5h
6h
7h
AG
3.22V - default
3.3V
3.38V
3.47V
still
startup (only in flash mode)
out_on set from 0 to 1), the voltage on VIN
is below
, the current is changed to
(
0=shutdown ( vin_low_v_shutdown
function is disabled
R/W
R/W
R/W
1h
2h
content
3.0V
3.07V
3.14V
3.22V
3.3V - default
6h 3.38V
7h 3.47V
Enables Shutdown of current reduction under low voltage conditions
0 if before startup (
out_on set from 0 to 1), the voltage
on VIN is below vin_low_v , the current is changed to
1
0
1 if before startup (
out_on set from 0 to 1), the voltage
on VIN is below vin_low_v , the operating mode stays
in shutdown (zero LED current) and
Enables Constant output voltage mode
Normal operation defined by mode_setting
5V constant voltage mode on VOUT1/2; reset registers
before setting this bit www.austriamicrosystems.com/AS3647 1.5-4 25 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Register
Bit
Addr: 5
Bit Name
This register identifies the flash timer and timeout settings
Default Access Description
Define the duration of the flash timer and timeout timer
0h
1h
2ms
4ms
2h 6ms
7:0 flash_timeout 23h R/W
...
23h
...
7F
...
72ms - default
...
256ms
264ms(now 8 ms LSB steps from here on)
1
valid
80
81
82
...
FEh
FFh
AG
272ms
280ms
...
1272ms
1280ms
still
1. Internal calculation for codes above 80h: flash timeout [ms] = (
-127) * 8 + 256 [ms]
Bit
Addr: 6
Bit Name
1:0
3 mode_setting out_on
X
0
00
Default Access content
00 shutdown or external torch mode if
=10 indicator mode (or low current mode using PWM)
LED current is defined by the 6LSB bits of led_current
pwm modulated with 31.25kHz defined by register
(1/16...4/16)
R/W
01 assist light mode:
1
bits of
10
LED current is defined by the 7LSB
R
R/W
11 flash mode:
LED current is defined by led_current
(
out_on and mode_setting are automatically cleared
after a flash pulse) reserved - don’t use, always write 0
Enables the output current sinks (pin LED_OUT1/2)
0
1 outputs disabled outputs enabled
(
out_on and mode_setting are automatically cleared
after a flash pulse) www.austriamicrosystems.com/AS3647 1.5-4 26 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
1. The MSB bit of this register not used to protect the LED; therefore the maximum assist light current = half the maximum flash current
Table 13. Strobe Signalling Register
Bit
Addr: 7
Bit Name
6
7
Register
Bit
0
1
2
3
4
5
7 strobe_type strobe_on
Addr: 8
Bit Name
fault_uvlo reserved reserved fault_txmask fault_timeout fault_overtemp fault_ovp
0
0
0
0
0
0
Register
This register defines the flash current reducing and mode for STROBE
Default Access Description
1
1
R/W
R/W
0
Defines if the STROBE input is edge or level sensitive; see also bit
0
1
STROBE input is edge sensitive
STROBE input is level sensitive
Enables the STROBE input
valid
STROBE input disabled
1
AG
Description Default Access
STROBE input enabled in flash mode
still
an undervoltage event has happened - see
Reduction by VIN measurements in Flash Mode on page 16
R/sC
1
No
R
R/sC
1
content
0
Yes reserved - don’t use reserved - don’t use
TXMASK/TORCH event triggered during flash - see
TXMASK event occurred on page 14
No
1
R/sC
1
R/sC
1
R/sC
1
R/sC
1
0
1
0
1
0
1
0
1
Yes
No fault
Flash timeout exceeded
see Overtemperature Protection on page 14
No fault
Junction temperature limit has been exceeded
see Short Circuit Protection on page 14
No fault
A shorted LED is detected (pin LED_OUT1/2)
see Overvoltage Protection on page 13
No fault
An overvoltage condition is detected (pin VOUT) www.austriamicrosystems.com/AS3647 1.5-4 27 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
1. R/sC = Read, self clear; after readout the register is automatically cleared
Register
Bit
1:0
2
Addr: 9
Bit Name
inct_pwm freq_switch_on
Register
This register defines the PWM mode (e.g. for indicator) and 4/1MHz mode switching
Default Access Description
00
0
R/W
R/W
11
Define the AS3647/47B PWM with 31.25kHz operation for
indicator or low current mode ( mode_setting
=01)
00
01
10
1/16 duty cycle
2/16 duty cycle
3/16 duty cycle
valid
4/16 duty cycle
Exact frequency switching between 4MHz/1MHz for assist and flash modes for operation close to maximum
0
1 pulsewidth
Pulseskip operation is allowed for all modes -
AG
results in better efficiency
In flash and assist light mode (indicator mode or low current mode using PWM always will use pulseskip) if
led_current >=40h , the DCDC is running at 4MHz or
1MHz (pulseskip is disabled) - results in improved noise performance;
Table 17. Minimum LED Current Register
Addr: Eh ams
Default Access Bit
7:0
Bit Name
led_current_min
12
00h R
This register reports the minimum LED current from the last operation cycle
Minimum current through the current sink (only including all current reductions as described in
VIN measurements in Flash Mode excluding current
reductions caused by
)
1. As the internal change of this register is asynchronous to the readout, it is recommended to readout the register after the flash pulse. The register will store the minimum current through the LED after e.g. a previous flash.
This current can be used for a subsequent flash pulse for a safe operating range.
2. This register is only set if an actual current reduction happens (
fault_uvlo (see page 27) =1) otherwise
=0.
Table 18. Actual LED Current Register
Bit
7:0
Addr: Fh
Technical
R
This register reports the actual set LED current
Description
Actual set current through the current sink (including all
current reductions as described in Flash Current
Reductions including LED current ramp up/down)
1. As the internal change of this register is asynchronous to the readout, it is recommended to readout the register twice and compare the results.
www.austriamicrosystems.com/AS3647 1.5-4 28 - 37
AS3647/47B
Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n
Register Map
Table 21. Register Map
1
Register
Definition
Name
ChipID
Current Set
TXMask
Addr
0
1
3
Default
Bxh
9Ch
68h
Low Voltage
Flash Timer
Control
Strobe Signalling
Fault
PWM and
Indicator
Minimum LED
Current
Actual LED
Current
4
5
6
7
8
9
Eh
Fh
2Ch
23h
00h
C0h
00h
00h
00h
00h
Content b1
b0 b7 b6 b5
b4 b3 b2
valid
strobe_ on fault_ov p strobe_t ype fault_le d_short fault_ov ertemp fault_ti meout fault_tx mask
AG
led_current_min led_current_actual
content
Technical
www.austriamicrosystems.com/AS3647 1.5-4 29 - 37
AS3647/47B
Datasheet, Confidential - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
External Components
Input Capacitor C
VIN
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic capacitors are required for input decoupling and should be located as close to the device as is practical.
Table 22. Recommended Input Capacitor
10µ
10µ
Rated
Voltage
Part Number
GRM188R60J106ME47
LMK107BBJ106MA
C TC Code
X5R
X5R
6V3
6V3
Size
0603
0603
Manufacturer
Murata www.murata.com
Taiyo Yuden www.t-yuden.com
valid
If a different input capacitor is chosen, ensure similar ESR value and at least 3µF capacitance at the maximum input supply voltage. Larger capacitor values (C) may be used without limitations.
Add a smaller capacitor in parallel to the input pin VIN (e.g. Murata GRM155R61C104, >50nF @ 3V, 0402 size).
Output Capacitor C
VOUT
AG still
they have extremely low ESR and are available in small footprints. The capacitor should be located as close to the device as is practical.
X5R dielectric material is recommended due to their ability to maintain capacitance over wide voltage and temperature range.
Table 23. Recommended Output Capacitor
Part Number C ams
GRM219R61A116U
10µF +/-10%
>4.2µF@5V
GRM188R60J106ME84
1
10µF +/-20%
>4.2µF@4V
Rated
Voltage
X5R 10V
Size
0805
X5R 6.3V
0603
(1.6x0.8x0.85mm
max. 0.95mm height)
Manufacturer
Murata www.murata.com
1. Use only for VLED < 3.75V
If a different output capacitor is chosen, ensure similar ESR values and at least 4.2µF capacitance at 5V output voltage.
Technical
www.austriamicrosystems.com/AS3647 1.5-4 30 - 37
AS3647/47B
Datasheet, Confidential - A p p l i c a t i o n I n f o r m a t i o n
Inductor L
DCDC
The fast switching frequency (4MHz) of the AS3647/47B allows for the use of small SMDs for the external inductor.
The saturation current I
SATURATION
should be chosen to be above the maximum value of I
LIMIT
11
. The inductor should have very low DC resistance (DCR) to reduce the I
2
R power losses - high DCR values will reduce efficiency.
Table 24. Recommended Inductor
Part Number L
C3-P1.5R
LQM32PN1R0MG0
LQM2HPN1R0MGC
CIG32W1R0MNE
NRH2412T1R0N
CKP3225N1R0M
MAMK2520T1R0M
MDMK2020T1R0M
MAKK2016T1R0M
1.5µH
1.0µH
>0.6µH @ 3.0A
1.0µH
>0.6µH @ 2.0A
1.0µH
>0.7µH @ 2.7A
>0.6µH @ 3.0A
1.0µH
>0.6µH @ 2.5A
1.0µH
>0.6µH @ 3.0A
1.0µH
>0.6µH @ 2.75A
1.0µH
>0.6µH @ 2.75A
1.0µH
>0.6µH @ 2.75A
DCR
58m
60m
100m
60m
+/-25%
77m
<60m
I
SATURATION
Size
56m
65m
3.0A
5
content
2.0A
7
2.5x2.0x1.2
mm height is max
2.0x2.0x1.2
2.0x1.6x1.0
mm height is max
Manufacturer
2.4A@25ºC,
2.0A
1
3x3x1.5mm
(height is max.)
Mitsumi www.mitsumi.com
3.0A
2
1.5A (2.0A)
3
3.2x2.5x0.9
mm max 1.0mm height
2.5x2.0x0.9
mm max 1.00mm height
3.0A
AG
3.0A
4
3.2x2.5mm
max 1.0mm height
2.4x2.4x1.2
mm (height is max.)
3.2x2.5x0.9
mm max 1.0mm height
Murata www.murata.com
valid
Samsung Electro-
still
Taiyo Yuden www.t-yuden.com
1. Do not exceed maximum I
SATURATION
- can be ensured by setting coil_peak
(will limit LED current)
2. Flash pattern: 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again (no limit on the number of total cycles)
Alternative pattern with 1000ms/1.6A, 200ms pause, 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again. (no limit on the number of total cycles)
3. Set current limit to 2A (
coil_peak =00b) - will limit maximum output current.
Flash cycle limit: 150ms on, 500ms off; repeat maximum 50 times.
4. Set current limit to 2.5A ( coil_peak =01b) - will limit maximum output current.
5. Set current limit to 3.0A ( coil_peak =10b) - can limit maximum output current.
6. Set current limit to 2.5A ( coil_peak =01b) - will limit maximum output current.
7. Set current limit to 2A (
coil_peak =00b) - will limit maximum output current.
Technical
LIMIT
.
11.Can be adjusted in I
2
C mode with register
www.austriamicrosystems.com/AS3647 1.5-4 31 - 37
AS3647/47B
Datasheet, Confidential - A p p l i c a t i o n I n f o r m a t i o n
PCB Layout Guideline
The high speed operation requires proper layout for optimum performance. Route the power traces first and try to minimize the area and wire length of the two high frequency/high current loops:
Loop1: C
VIN
/C
VIN2
- L
DCDC
- pin SW1/2 - pin GND - C
VIN
/C
VIN2
Loop2: C
VIN
/C
VIN2
- L
DCDC
- pin SW1/2 - pin VOUT1/2 - C
VOUT
- pin GND - C
VIN
/C
VIN2
At the pin GND a single via (or more vias, which are closely combined) connects to the common ground plane. This via(s) will isolate the DCDC high frequency currents from the common ground (as most high frequency current will flow
between Loop1 and Loop2 and will not pass the ground plane) - see the ‘island’ in Figure 32
.
Figure 32. Layout recommendation
'
)*(
$!%
&!&"&
still valid
AS3647
!"
#!!!
Note: ams
length of Loop1 and Loop2.
(
content
VIN2 in parallel to C
VIN
is recommended to filter high frequency noise for the power supply of AS3647/47B. This capacitor should be as close as possible to the GND/VIN pins of AS3647/47B.
Technical
www.austriamicrosystems.com/AS3647 1.5-4 32 - 37
AS3647/47B
Datasheet, Confidential - A p p l i c a t i o n I n f o r m a t i o n
5V Operating Mode
The AS3647/47Bcan be used to power a 5V system (e.g. audio amplifier). The operating mode is selected by setting
register bit const_v_mode (page 25)
=1. In this operating mode, the current sinks are disabled and cannot be switched on (no flash/torch operation is possible).
Note:
There is always a diode between VIN and VOUT1/2 due to the internal circuit. Therefore VOUT1/2 cannot be completely switched off
Figure 33. 5V Operating Mode
AS3647/47B
AG still valid
Technical
www.austriamicrosystems.com/AS3647 1.5-4 33 - 37
AS3647/47B
Datasheet, Confidential - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
Figure 34. WL-CSP13 Marking AS3647
Note:
Line 1: austriamicrosystems logo
Line 2: AS3647
Line 3: <Code>
Encoded Datecode (4 characters)
Figure 35. WL-CSP13 Package Dimensions AS3647
!"
#$%
&$'
%
)
%
)
%
)
AG ams
%
)
%
)
%
)
* * * *
still valid
(
+ + + + + +
The coplanarity of the balls is 40µm.
Technical
( www.austriamicrosystems.com/AS3647 1.5-4 34 - 37
AS3647/47B
Datasheet, Confidential - P a c k a g e D r a w i n g s a n d M a r k i n g s
Figure 36. WL-CSP15 Marking AS3647B
Note:
Line 1: austriamicrosystems logo
Line 2: AS3647B
Line 3: <Code>
Encoded Datecode (4 characters)
Figure 37. WL-CSP15 Package Dimensions AS3647B
!
" #
%*
)
!
!
& &
' '
( (
'%
(%
!%
%
&%
ams
!%
%
&% &
!
'% ' '
(% ( (
The coplanarity of the balls is 40µm.
Technical
!
%*
still
)
$
valid
% www.austriamicrosystems.com/AS3647 1.5-4 35 - 37
AS3647/47B
Datasheet, Confidential - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 25
.
Table 25. Ordering Information
Model Description Delivery Form Package
AS3647-ZWLT 1600mA High Current LED Flash Driver Tape & Reel
13-pin WL-CSP
(2.25x1.5x0.6mm)
0.5mm pitch
RoHS compliant / Pb-Free /
Green
AS3647B-
ZWLT
1
1600mA High Current LED Flash Driver Tape & Reel
15-pin WL-CSP
(2.25x1.5x0.5mm)
0.4mm pitch
RoHS compliant / Pb-Free /
Green
valid
1. Check with austriamicrosystems for availability and lead time of AS3647B. AS3647B is only available upon request.
Note:
All products are RoHS compliant and austriamicrosystems green.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Technical support is found at or find your local distributor at
AG still
For further information and requests, please contact us mailto:[email protected]
Note:
AS3647/47B-ZWLT
AS3647/47B-
Z
T Delivery Form: Tape & Reel
WL Package: Wafer Level Chip Scale Package (WL-CSP) 2.25x1.5x0.6mm
content
Technical
www.austriamicrosystems.com/AS3647 1.5-4 36 - 37
AS3647/47B
Datasheet, Confidential - O r d e r i n g I n f o r m a t i o n
Copyrights
Copyright © 1997-2012, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, 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.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
valid
This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for production flow, such as test flow or test location.
still
austriamicrosystems 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 austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
Tobelbaderstrasse 30
Schloss Premstaetten
A-8141 Austria
Technical
For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com/AS3647 1.5-4 37 - 37
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