SX8644I05AWLTRT Semtech, SX8644I05AWLTRT Datasheet - Page 22

• Manufacturer Part Number: SX8644I05AWLTRT
• Description: 12-ch Capacitive Touch Solution (Button & Slider)
• Manufacturer: Semtech

SX8644
Ultra Low Power, Capacitive Button and Slider
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 SX8644 is then ready for operation.
Power Up vs. INTB
Figure 21
During the power on period the SX8644 stabilizes the internal regulators, RC clocks and the firmware initializes all
registers.
During the power up the SX8644 is not accessible and I2C communications are forbidden.
As soon as the INTB rises the SX8644 will be ready for I2C communication.
3.14.2 RESETB
When RESETB is driven low the SX8644 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_3, January 10
© 2009 Semtech Corp.
www.semtech.com
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