sx8644 Semtech Corporation, sx8644 Datasheet - Page 37

• 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
VANA, VDIG
The SX8644 has on-chip regulators for internal use (pins VANA and VDIG).
VANA and VDIG have protection to VDD and to GND.
The output of the regulators needs to be de-coupled with a small 100nF capacitor to ground.
Figure 44 shows a simplified diagram of the VANA and VDIG pin.
4.5 General purpose IO pins
The SX8644 has 8 General purpose input/output (GPIO) pins.
All the GPIO pins have protection to VDD and GND.
The GPIO pins can be configured as GPI, GPO or GPP.
Figure 45 shows a simplified diagram of the GPIO pins.
Revision 7_3, January 10
Figure 44
Cvana
Cvdig
Figure 45
GND
GND
Simplified diagram of VANA and VDIG
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
VANA
VDIG
Simplified diagram of GPIO pins
SX8644
37
Ultra Low Power, Capacitive Button and Slider
VDD
VDD
VDIG
VANA
DATASHEET
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SX8644