sx8644 Semtech Corporation, sx8644 Datasheet - Page 33

• Manufacturer Part Number: sx8644
• Description: Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
4.3 Host interface pins
The host interface consists of the interrupt pin INTB, a reset pin RESETB and the standard I2C pins: SCL and
SDA.
INTB
The INTB pin is an open drain output that requires an external pull-up resistor (1..10 kOhm). The INTB pin is
protected to VDD using dedicated devices. The INTB pin has diode protected to GROUND.
Figure 37 shows a simplified diagram of the INTB pin.
Revision 7_3, January 10
to host
R_INT
Figure 36
VDD
Figure 37
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
Simplified diagram of CN and CP
SX8644
Simplified diagram of INTB
CN
CP
SX8644
INTB
33
Ultra Low Power, Capacitive Button and Slider
VANA
VANA
INT
ASI
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SX8644