sx8643 Semtech Corporation, sx8643 Datasheet - Page 20

• Manufacturer Part Number: sx8643
• Description: Ultra Low Power, Capacitive Button Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

SX8643
Ultra Low Power, Capacitive Button Touch Controller
(12 sensors) with Enhanced LED Drivers
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 SX8643 is then ready for operation.
Power Up vs. INTB
Figure 16
During the power on period the SX8643 stabilizes the internal regulators, RC clocks and the firmware initializes all
registers.
During the power up the SX8643 is not accessible and I2C communications are forbidden.
As soon as the INTB rises the SX8643 will be ready for I2C communication.
3.14.2 RESETB
When RESETB is driven low the SX8643 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 17
Revision 7_5, February 10
© 2010 Semtech Corp.
www.semtech.com
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