sx8638 Semtech Corporation, sx8638 Datasheet - Page 22

• Manufacturer Part Number: sx8638
• Description: Low Power, Capacitive Button And Slider Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity
• Manufacturer: Semtech Corporation

SX8638
Low Power, Capacitive Button and Slider Touch Controller
(8 sensors) with Enhanced LED Drivers and Proximity
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.14 Reset
The reset can be performed by 3 sources:
- power up,
- RESETB pin,
- software reset.
3.14.1 Power up
During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released
autonomously. The SX8638 is then ready for operation.
Power Up vs. INTB
Figure 21
During the power on period the SX8638 stabilizes the internal regulators, RC clocks and the firmware initializes all
registers.
During the power up the SX8638 is not accessible and I2C communications are forbidden.
As soon as the INTB rises the SX8638 will be ready for I2C communication.
3.14.2 RESETB
When RESETB is driven low the SX8638 will reset and start the power up sequence as soon as RESETB is
driven high or pulled high.
In case the user does not require a hardware reset control pin then the RESETB pin can be connected to VDD.
Hardware Reset
Figure 22
Revision 7_6, September 10
© 2010 Semtech Corp.
www.semtech.com
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