Weltrend | Products

Application-specific MCUs

WT5701

WT5701 is a 12-key capacitive touch key sensor. It is designed for replacing button and also can be configured as matrix scan function. WT5701 has low power consumption, so it is suitable for consumer products and portable applications.

Features

- 1-12 channel input sensor
- Auto sensitivity calibration
- 3 sensitivity option pins
- Anti-noise circuit embedded
- 3 output modes
- Direct output: 12 output pad (open drain output)

- Serial output(I2C) and include interrupt pin

- PWM output
- Output polarity option: active high or active low
- 12 output expander(maximum)
- Open-drain digital output with maximum drain current 8mA
- Wide operating voltage: 2.2V ~ 5.5V
- 3 operation modes: Normal mode, Slow mode and Sleep mode
- Low operating current
- Normal mode

- 3.0V: Typical 30uA

- 5.0V: Typical 60uA

- Slow mode

- 3.0V: Typical 3uA

- 5.0V: Typical 7uA

- Sleep mode

- 3.0V: < 1uA

- 5.0V: < 1uA
- Package type
- LQFP48

- QFN32

- QFN16
- 4 I²C ID(2 external output option pins)
- Calibration function can be set enable/disable
- Each sensor sensitivity is individually programmable by 3 bits
- 2 sensors (SI[0]/SI[1]) can work at slow mode, response time is 100~150ms(max. @3.0V)
- One PWM could output via OUT[11:0]
- Add external reset pin, active low
- Auto-reset (calibration) function (default disable). If any key is touched more than 190 sec, chip will reset calibration function automatically.

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