Waveshare Capacitive Touch Keypad (B)

Features
1. Onboard 8 capacitive touchkeys and 1 linear capacitive touch sensor
2. Features TONTEK TonTouch touch pad detector IC TTP229-LSF, supports up to 16 keys with adjustable sensitivity and built-in LDO
3. The system re-calibrates automatically when all keys are not detected touch more than about 4 seconds
4. Configurable functions:
- 8 keys OR 16 keys option
- 8 separate outputs OR serial output
- Single-key OR multi-kye feature
- Sampling rate and sampling length at sleep mode
- Maximum key-on time

Specifications
1. Interface: I2C OR I/Os
2. Keys: 8/16
3. Sampling rate : 8Hz/64Hz
4. Human Body Mode: 6KV
5. Operating voltage: 2.4V-5.5V
6. Operating temperature: -40 degree C to +85 degree C
7. Storage temperature: -50 degree C to +125 degree C
8. Dimensions: 4.7CM x 6.8CM
9. Mounting holes size: 3 x 3MM

How to Use
1. After power-on have about 0.5sec stable-time. During the time do not touch the key pad, and all functions are disabled
2. 16 keys mode : short all the onboard jumpers, output via serial port, and the linear touch sensor is enabled
3. 8 keys mode : short the SLWPTM and WPSCT, open all the other jumpers, output via OUT0-OUT7

Applications
1. Consumer Products
2. Mechanical Switch/Button Replacement