Nuvoton NT1080 Data Sheet

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Document

NT1080

8-bit Microcontroller

Nuvoton Touch Key Series

NT1080

Datasheet

The information described in this document is the exclusive intellectual property of

Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton.

Nuvoton is providing this document only for reference purposes of NuMicro microcontroller based system design. Nuvoton assumes no responsibility for errors or omissions.

All data and specifications are subject to change without notice.

For additional information or questions, please contact: Nuvoton Technology Corporation. www.nuvoton.com

Oct 26, 2015 Page 1 of 22 Rev 1.0

NT1080

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NT1080

9 Electrical Characteristics

....................................................................... 19

9.1

Absolute Maximum Ratings

........................................................................ 19

9.2

DC Electrical Characteristics

....................................................................... 19

10 Package Dimension

............................................................................ 20

10.1

TSSOP20 – 4.4X6.5mm

............................................................................ 20

11 REVISION HISTORY

........................................................................... 21

Oct 26, 2015 Page 3 of 22 Rev 1.0

NT1080

GENERAL DESCRIPTION

The Nuvoton touch key series, NT1080, supports 8 capacitive touch keys and 8 corresponding output channels with excellent anti-impulse noise and anti-electromagnetic noise ability. The

NT1080 supports many functions, such as single key, multi-key and toggle mode. Meanwhile, an external host MCU can control the NT1080 through the I²C bus easily.

Oct 26, 2015 Page 4 of 22 Rev 1.0

2 FEATURES

 Support 8 capacitive touch keys and 8 corresponding output channels

 Output modes:

 GPIO

 I²C

 Water resistant or water-droplet operation

 Operating at water resistant without error operation

 Key lock function

 Resist electromagnetic immunity

 Resist mobile phone electromagnetic immunity

 Resist 5W walky-talky electromagnetic immunity (> 2 cm)

 Multiple touch key output selection

 Single touch key/ multi-keys function selectable

 Toggle function

 Low active/high active output

 Key lock function

 I²C parameter settings

 Touch key trigger level for each key

 Touch key de-bounce for each key

 Auto calibration interval

 Operating voltage: 2.4V~5.5V

 Operating current: 1.8mA~2.3mA

 Operating temperature: -40 ℃ ~85 ℃

 Touch key response time: 32 ms

NT1080

Oct 26, 2015 Page 5 of 22 Rev 1.0

NT1080

PIN DIAGRAM

SEN1

OUT1

OUT2

-RST

OUT5/SDA

OUT6/SCL

20 PIN

SEN2

SEN3

SEN4

SEN5

SEN6

SEN7

SEN8

OUT8

OUT7

Figure 3-1 TSSOP20 Pin Diagram

No.

Oct 26, 2015

SEN8

SEN7

SEN6

SEN5

SEN4

SEN3

SEN2

Pin Name Description

SEN1

OUT1

OUT2

-RST

Touch key-1 input pin.

Touch key-1 output pin.

Touch key-2 output pin.

IC reset pin.

Ground pin.

SEL Output mode selection pin.

(Connected to V

: GPIO output, Connected to V

: I

C output)

OUT3/-ACT Touch key-3 output pin / Touch key active indicator when selecting

C output

OUT4

OUT5/SDA

OUT6/SCL

OUT7

OUT8

Touch key-4 output pin.

Touch key-5 output pin / Data pin of I²C bus when selecting I²C output. ( I²C : write touch key parameter only)

Touch key-6 output pin/ Clock pin of I²C bus when selecting I²C output. (I²C : write touch key parameter only)

Touch key-7 output pin.

Touch key-8 output pin.

Touch key-8 input pin.

Touch key-7 input pin.

Power supply pin.

Touch key-6 input pin.

Touch key-5 input pin.

Touch key-4 input pin.

Touch key-3 input pin.

Touch key-2 input pin.

Table 3-1 Pin Description

Page 6 of 22 Rev 1.0

NT1080

CAPACITIVE TOUCH KEY

4.1

Input Circuit

Each capacitive touch key needs to connected with one resistor as shown in Figure 4-1. It is

strongly recommended that the resistor value is 100 kΩ. At the same time, all the resistors need to be kept as close to sensor pad as possible during PCB layout.

Touch

Pad

SENn

100K

Figure 4-1 Touch Key Reference Circuit

4.2

Sensor Pad and Ground for PCB Layout

The size of sensor pad, using circular shape with diameter equal or greater than 8mm is recommended. Actually, sensor pad could be any kinds of shape, but fulfilling finger size is suitable.

Extra ground-net around sensor pads is not needed for PCB artwork. However, ground-net along

sensor pad to chip is alternative. Figure 4-2 shows that the PCB line width of sensor pad to chip

should be 0.254mm (10mil) or less and to keep distance with ground at least 1mm. The other layer of PCB could implement ground-net for PCB artwork to block noise interfering with signal line. All the subsidiary components need to be kept as close to sensor pad as possible at PCB layout.

Meanwhile, touch key chip (NT1080) and touch pad located in the PCB board would be better.

0.254mm(10mil)

GND

Sensor

Pad

>1mm

GND

Figure 4-2 Sensor Pad and Ground-Net

As shown in Figure 4-3, a spring attached with metal-panel can be used to act as sensor pads. It is

recommended that metal-panel (ring) should be adhered to the inside of cover to be an effective sensing area. If user wants to add a LED in the middle of sensor pad, the measure of sensor area should be increased to compensate the hollowing part and keeping the same sensitivity.

Oct 26, 2015 Page 7 of 22 Rev 1.0

NT1080

Figure 4-3 Spring with Solid Metal Plane/Ring

4.3

Sensor Pad Size

The size of sensor pad plays a great role in determining thickness of panel. The greater area of

sensor pad is, and the deeper touch signal could be detected. Table 4-1 shows the relation with

thickness and panel thickness.

Size of Sensor Pad

8 mm X 8 mm

10 mm X 10 mm

15 mm X 15 mm

20 mm X 20 mm

Panel Thickness

(Recommended Value)

2.0 mm

3.0 mm

4.5 mm

6.0 mm

Table 4-1 Sensor Pas and Corresponding Panel Thickness

Oct 26, 2015 Page 8 of 22 Rev 1.0

NT1080

I

C INTERFACE

The maximum speed of I

C serial interface could be up to 400Kbps and it will not send any signal in an active way to main controller since it is I

C slave. The I

C interface is not working in normal operation time. To enter I

C serial mode, user must connect V

to SEL pin and then make chip

I power-on. User could easily set the touch related parameter and adjust the sensitivity by using the

C interface.

The I

C transmission provides three modes: byte-write, random-read and continual-read.

5.1

Byte-Write

The data protocol includes 3 bytes from master writing data to salve. The first byte for Device

address, the second byte for Memory address and the third byte is for the write data. Figure 5-1

shows the detail about byte-write action.

SDA

SCL

Byte1 Device address Byte2 Memory address Byte3 Data

Figure 5-1 Byte-write Mode

In normal times, SDA and SCL will be kept as logic 1. For the start signal, SDA will change to logic

0 first then SCL to logic 0 as well. When transmitting, data is prepared on SDA signal and then SCL will change to logic 1. Slave reads the byte data based on the rising edge of SCL signal. Slave will send logic 0 on the 9th clock signal to indicate receiving the byte data. For the stop signal, master device will change SCL to logic 1 and then SDA to 1, when the transmission of 3 bytes of information are finished.

5.2

Random-Read

This is a 4-byte data combination when Master reads Slave. Figure 5-2 shows that the first byte is

used as device address and write-status; the second byte is used as memory address; the third byte is used as device address and read-status and the fourth byte is used as Slave output data with Master keeping sending the SCL clock signal.

SDA

SCL

Byte1 Device address Byte2 Memory address

Oct 26, 2015

Byte3 Device address

Figure 5-2 Random-Read Mode

Page 9 of 22

Byte4 Data

Rev 1.0

NT1080

After finishing 2nd byte data transmission, Start signal is needed before sending next 3rd byte data.

SCL signal will change to logic 0 when 3rd byte data transmission is done. SCL signal will be released till 4 th

output data is ready. The first host could send logic 1 on SCL and monitor SCL changing to logic 1 to receive 1 st

bit. Note that Master should send a logic 1, NACK signal, on the

9th clock signal of the 4th byte.

5.3

Continual-Read

This is a 4-byte data combination when Master continually reads Slave. Figure 5-3 shows that the

first byte as device address and write-status; the second byte as memory address; the third byte as device address and read-status. From the fourth byte, Slave will keep output data with Master keeping sending ACK and SCL clock signal. The memory address will be automatically increased.

SDA

SCL

…

...

Byte1 Device address Byte2 Memory address Byte3 Device address Byte4 Data 1 Byte Data n

Figure 5-3 Continual-Read Mode

5.4

C Circuit

The pins of I

C are SDA and SCL with Open-Drain mode which requires pull-high resistor on the I

C bus.

VDD

SDA

SCL

SDA SCL

Host

SDA SCL

Nu-Touch

SDA SCL

Other Device

Figure 5-4 I

C Bus Connection

Oct 26, 2015 Page 10 of 22 Rev 1.0

NT1080

I

C DATA DEFINITION

6.1

Memory Address

Table 6-1 shows the memory address of I

C starting from 0x00~0x4F with specific function on each address.

R: Read only, R/W: Read / Write, (B)R: Must be set “Build” bit, and user can read only.

(B)R/W: Must be set to “Build” bit, and user can read and write.

Address R/W Description Default

0x00

0x01

0x02

0x03

Product no.

Shows how many buttons supported.

R Version no.

R/W I

C Device address

Bit7 Bit6 Bit5

A7 A6 A5

Bit4

Bit3

Bit2

Bit1

Bit0

0x81

0x08

0x31

0x60

0x04 0x08

0x06

0x07

0x0C

0x0D

0x0E

0x0F

0x10

R/W

Bit7

Reset

Bit6

Bit5

System control

Bit4

Bit3 Bit2 Bit1 Bit0

Auto Calibrate X Build

R/W Output mode

Bit7

Multi

Bit6

Toggle

Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Act-

High

0 Lock En-

Any

0 0

(B)R/W Sense pin Enable

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Sen8 Sen7 Sen6 Sen5 Sen4 Sen3 Sen2 Sen1

(B)R/W De-Bounce (Range: 1~7)

(B)R/W Plus Times (Range: 15~127)

(B)R/W Sensor Cycle (Range: 3~15)

(B)R/W Calibration Delay (Range: 7~63)

R Status

Bit7

Any-

Act

Bit6

B-

Change

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

0x00

0xFF

0x03

0x32

0x07

0x32

0x00

Oct 26, 2015 Page 11 of 22 Rev 1.0

NT1080

0x11 R Key Status

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

Sen8 Sen7 Sen6 Sen5 Sen4 Sen3 Sen2 Sen1

0x15 R/W LED Control

Bit7

OUT8

Bit6

OUT7

Bit5

Bit4

Bit3

OUT4

Bit2

Bit1 Bit0

OUT2 OUT1

0x20~0x27 (B)R/W Trigger Level (Range: 3~63)

0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27

Sen1 Sen2 Sen3 Sen4 Sen5 Sen6 Sen7 Sen8

0x40~0x4F (B)R Sensor Value

0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47

Sen1-

Sen2-

Sen3-

Sen4-

0x48 0x49 0x4A 0x4B 0x4C 0x4D 0x4E 0x4F

Sen5-

Sen6-

Sen7-

Sen8-

0x00

0x12

0x0000

Table 6-1 I

C Memory Address Definition and Description

6.2

Address 0x00: Product No.

Product identification using

6.3

Address 0x01: Button No.

Product identification using

6.4

Address 0x02: Version No.

Product identification using

6.5

Address 0x03: I

C Device Address

The default address is 0x60, including read/write 8-bit address. The device address could be changed by the I

C interface. When changing the device address, the latest device address must be used in next read/write action.

6.6

Address 0x04: System Control Bits

Bit7

Reset

Bit6

Bit5

Bit4

Reset:

Bit3 Bit2

Auto Calibrate

Bit1

Bit0

Build

Software reset.

Chip could be reset by writing “1” to become default value. This bit will

Oct 26, 2015 Page 12 of 22 Rev 1.0

NT1080

Auto:

Calibrate:

Build: be automatically changed back to “0” when chip reset is done.

Auto Calibration.

Write “1” to this bit and chip will automatically refer the value in address

“0x0F” to execute new calibration delay time function.

Calibration enabled.

User could set this bit to enable calibration procedure and this bit will return to “0” when finishing the calibration. This bit is valid when “Auto” bit is “0”.

Test mode.

1 = Read related sensor parameter and data to provide test and analysis function.

0 = Hide some parameter which has nothing to do with operation action to prevent parameter being changed accidentally.

6.7

Address 0x06: Output Mode Settings

Bit7

Multi

Bit6 Bit5

Toggle Act-High

Bit4

Bit3

Lock

Multi:

Toggle:

Act-High:

Lock:

En-Any:

Bit2

En-Any

Bit1

Bit0

Multi-key output.

1 = Output multi-key status simultaneously

0 = Output the key status with greatest signal

Switch mode.

1 = GPIO is set to output signal in latch way to simulate like a switch.

Press to active and then press to inactive.

This bit is active when “Display” is set as “0” and “Dout_0” as “1”. The high/low level will be decided by the “Act-High” setting.

High level action.

1 = GPIO output high level.

0 = GPIO output low level.

This bit is active when “Display” is set as “0” and “Dout_0” as “1”.

Lock.

1 = If two or more keys are triggered, all output will be locked and no any output signal happened.

Enable -Act pin.

1 = Enable -Act pin function. Any pressed key will make -Act pin output low level signal. -Act pin will return to high level when no key is pressed.

Oct 26, 2015 Page 13 of 22 Rev 1.0

NT1080

6.8

Address 0x07: Enable Sense Pin

Bit7

Sen8

Bit6

Sen7

Bit5

Sen6

Bit4

Sen5

Sen8~Sen1:

Bit3

Sen4

Enable Sense Pin.

1 = Enable corresponding key

0 = Disable corresponding key

Bit2

Sen3

Bit1

Sen2

Bit0

Sen1

6.9

Address 0x0C: De-Bounce

The value is from 1 to 7. Set this parameter to prevent key output bouncing. Key will react slower with less chance happening bouncing when set this value higher.

6.10

Address 0x0D: Plus Times

The value is from 15 to 127. The captures data will be more stable and key react slower if set this value higher.

6.11

Address 0x0E: Sensor Cycle

The value is from 3 to 15. The captures data will be more stable and key react slower if set this value higher.

6.12

Address 0x0F: Calibration Delay

The value is from 7 to 63. It defines how long chip will do re-calibration process again.

This bit is valid if “Auto” bit is set to “1”.

6.13

Address 0x10: Status.

Bit7 Bit6

Any-Act B-Change

Bit5

Any-Act:

B-Change:

Bit4

Bit3

Bit2

Bit1

Bit0

This bit will be set to “1” if any key is pressed.

It will be cleared to “0” if all key are released.

This bit will be set to “1” if any key status is changed.

It will be cleared to “0” if no key status is changed whether key is pressed or not.

6.14

Address 0x11: Key status

Bit7

Sen8

Bit6

Sen7

Bit5

Sen6

Sen8~Sen1:

Bit4

Sen5

Bit3

Sen4

Bit2

Sen3

Bit1

Sen2

Bit0

Sen1

1 = Corresponding key is pressed.

0 = Corresponding key is released.

Reading status here will ignore the setting in OUTPUT MODE

Oct 26, 2015 Page 14 of 22 Rev 1.0

NT1080

6.15

Address 0x15: LED Control

Bit7

OUT8

Bit6

OUT7

Bit5

OUT8~OUT1:

Bit4

Bit3

OUT4

Bit2

Corresponding to pin OUT8~OUT1.

1 = Pin output high.

0 = Pin output low.

Bit1

OUT2

Bit0

OUT1

6.16

Address 0x20~0x27 ： Trigger Level

The value is from 3 to 63. This bit is to set trigger level individually to eliminate the sensitivity difference on each touch key sensor. The lower value user set will get higher sensitivity but lower stability.

Address 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27

Sensor Sen1 Sen2 Sen3 Sen4 Sen5 Sen6 Sen7 Sen8

6.17

Address 0x40~0x4F ： Sensor Value

The value shows the reading sampling result which is from 0 to 1023. The data format is MSB first, then LSB.

Address 0x40

Sensor

Sen1-

High

Address 0x48

Sensor

Sen5-

High

0x41

Sen1-

Low

0x49

Sen5-

Low

0x42

Sen2-

High

0x4A

Sen6-

High

0x43

Sen2-

Low

0x4B

Sen6-

Low

0x44

Sen3-

High

0x4C

Sen7-

High

0x45

Sen3-

Low

0x4D

Sen7-

Low

0x46

Sen4-

High

0x4E

Sen8-

High

0x47

Sen4-

Low

0x4F

Sen8-

Low

Oct 26, 2015 Page 15 of 22 Rev 1.0

NT1080

7 GPIO

Each GPIO has the corresponding touch key output. For example, the OUTn pin corresponds to the

SENn pin. Figure 7-1 shows all the output pins in Open-Drain mode. Figure 7-2 shows that it is

easy to connect the system with the voltage lower than V

and it is convenient to achieve analog output mode via a resistor ladder. Add a pull-high resistor to perform active-high state. There are many kinds of output modes related to address 0x06 settings. Table 7-1 shows the detailed settings on relationship of each bit.

Output

Figure 7-1 Open-Drain

OUT1

OUT2

Open-

Drain

OUT3

OUT4

OUT5

Figure 7-2 Resistor-voltage Divider Output

Application

Single key, output low level (when active)

Single key, output high level

Multi key, output low level

Multi key, output high level

Single key, switch, output low level

Single key, switch, output high level

Multi Toggle Act-High

0 0 0

Lock

Oct 26, 2015 Page 16 of 22 Rev 1.0

Multi key, switch, output low level

Multi key, switch, output high level

Single key, output low level, Lock

Single key, output high level, Lock

Single key, switch, output low level, Lock

Single key, switch, output high level, Lock

Table 7-1 GPIO Function Settings

NT1080

Oct 26, 2015 Page 17 of 22 Rev 1.0

8 REFERENCE SCHEMATIC

Key

100K SEN

Key

100K

Key

100K

SEN

0.1u

OUT

OUT3/-

ACT

OUT

OUT5/SD

Key

100K

Key

100K

Key

100K

SEN

NT1080

OUT6/SC

OUT

SEN

OUT

Key

100K SEN

SEL

Key

100K SEN

-RST

33R

3K3

100R

10u

SDA

SCL

NT1080

Oct 26, 2015 Page 18 of 22 Rev 1.0

9 ELECTRICAL CHARACTERISTICS

9.1

Absolute Maximum Ratings

Parameter

Operating Temperature

Storage Temperature

DD to V

voltage

Other pin to V

voltage

9.2

DC Electrical Characteristics

Parameter

Operating Voltage

Operating Current

Input Low Voltage

Input High Voltage

Output Low

Voltage (GPIO)

Symbol

OL1

Condition

---

= 5V

= 3V

2.4V<V

<5.5

2.4V<V

<5.5

= 4.5V,

= 20mA

Range

-40 to +85

-55 to +150

-0.3 to +6.5

-0.3 to (V

+0.3)

Unit



Min.

2.4

-0.5

0.7V

Typ.

2.30

1.93

Max.

5.5

0.3V

+0.5

0.45

Unit

V mA mA

NT1080

Oct 26, 2015 Page 19 of 22 Rev 1.0

PACKAGE DIMENSION

10.1

TSSOP20 – 4.4X6.5mm

NT1080

Oct 26, 2015 Page 20 of 22 Rev 1.0

11 REVISION HISTORY

Date Revision

2015.10.26 1.0

Description

Preliminary version

NT1080

Oct 26, 2015 Page 21 of 22 Rev 1.0

NT1080

Important Notice

Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any malfunction or failure of which may cause loss of human life, bodily injury or severe property damage. Such applications are deemed, “Insecure Usage”.

Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic energy control instruments, airplane or spaceship instruments, the control or operation of dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all types of safety devices, and other applications intended to support or sustain life.

All Insecure Usage shall be made at customer’s risk, and in the event that third parties lay claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the damages and liabilities thus incurred by Nuvoton.

Oct 26, 2015 Page 22 of 22 Rev 1.0

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