sx8661 Semtech Corporation, sx8661 Datasheet - Page 28

• Manufacturer Part Number: sx8661
• Description: Low Power, Capacitive Button Touch And Proximity Controller 8 Sensors With Led Drivers And Analog Output
• Manufacturer: Semtech Corporation

SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.16.4 Example
A typical example of the assertion and clearing of the INTB and the I2C communication is shown in Figure 24.
Interrupt and I2C
Figure 24
When a button is touched the SX8661 will assert the interrupt (1). The host will read the SX8661 status
information over the I2C (2) and this clears the interrupt.
If the finger releases the button the interrupt will be asserted (3), the host reads the status (4) which clears the
interrupt.
In case the host will not react to an interrupt then this will result in a missing touch.
3.17 Reset
The reset can be performed by 3 sources:
- power up,
- RESETB pin,
- software reset.
3.17.1 Power up
During power up the INTB is kept low. Once the power up sequence is terminated the INTB is released
autonomously. The SX8661 is then ready for operation.
Power Up vs. INTB
Figure 25
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
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