Capacitive Touch Keypad

Features

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

Specifications

• Interface : I2C OR I/Os
• Keys : 8/16
• Sampling rate : 8Hz/64Hz
• Human Body Mode : 6KV
• Operating voltage : 2.4V-5.5V
• Operating temperature : -40℃ to +85℃
• Storage temperature : -50℃ to +125℃
• Dimensions : 4.7CM × 6.8CM
• Mounting holes size : 3 × 3MM

How to Use

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

Development resources: demo codes, schematic, datasheets, etc.
 

Consumer Products
Mechanical Switch/Button Replacement