ADSemiconductor
®
ALRS08FB (8-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
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2 Pin Description
VDD, GND
Supply voltage and ground pin
R.N.D
Radio frequency Noise Detection pin. Normally, R.N.D pin does not connect to anywhere.
But, in radio frequency noise environment, this pin must form a pattern line on PCB.
CS0~CS7
Capacitive sensor input pins.
VPP
VPP is external supply voltage for OTP writing.
LDO
LDO on-off control output pin for MCU wake-up.
D0~D7
Parallel output ports of CS0~CS7 respectively / LED PWM drive output ports. The structure of these
parallel output ports are can be selected open drain NMOS for active low output level operation as well as
open drain PMOS for active high output level operation.
SCL, SDA
SCL is I
2
C clock input pin and SDA is I
2
C data input-output pin. These ports have internal pull-up resistor
which can be activated by “global_ctrl1” register
1
setting.
In case of not use, this pin must be not connected to any circuitry.
INT
Touch sensing interrupt output pin.
1
Refer to the chapter 8.2.6. Global option control 1 register
