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PDF NT084D Data sheet ( Hoja de datos )
| Número de pieza | NT084D | |
| Descripción | Touch the keypad | |
| Fabricantes | nuvoton | |
| Logotipo |  |
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NT084D
Touch Key Series
Nuvoton Touch Key Series
NT084D
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
Nov 10, 2016
Page 1 of 26
Rev 1.00
1 page  
NT084D
2 FEATURES
Support 8 capacitive touch keys and 8 corresponding output channels with four 7-segment LED
output selection
Multiple touch key output selection
Single touch key / multi-keys function selectable
Key lock function
Low active/high active output
Toggle function
Slider options
Output modes
LED output (push-pull mode)
GPIO（open-drain）sweeping can be configured to output
I²C
I²C parameter settings
Touch key trigger level for each key
Touch key de-bounce for each key
Auto calibration interval
Water repellent or water-droplet operation
Water-droplet operation without error
Water key response
Key lock function
ESD / EFT
Resist electromagnetic immunity
Resistance to electromagnetic waves of mobile phones
Resist 5W walky-talky electromagnetic immunity (> 2 cm)
Operating voltage: 2.4 V ~ 5.5 V
Operating current: 1.8 mA ~ 2.3 mA
Operating temperature: -40 ℃ ~ 85 ℃
Touch key response time: 81 ms
Nov 10, 2016
Page 5 of 26
Rev 1.00
5 Page 
NT084D
5 I2C INTERFACE
The maximum speed of I2C serial interface could be up to 400Kbps and it will not send any
signal in an active way to main controller since it is I2C slave. User could easily set the touch
related parameter and adjust the sensitivity by using the I2C interface.
The I2C transmission provides three modes: byte-write, random-read and continuous-read.
5.1 Byte-Write
The data protocol includes 3 bytes from master writing data to slave. 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
The SDA and SCL are 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 is 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
Byte3 Device address
Nov 10, 2016
Figure 5‑2 Random-Read Mode
Page 11 of 26
Byte4 Data
Rev 1.00
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet NT084D.PDF ] | |
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