sx8660 Semtech Corporation, sx8660 Datasheet - Page 23

• Manufacturer Part Number: sx8660
• Description: Ultra Low Power, Capacitive Button Touch Controller 8 Sensors With Enhanced Led Drivers And Analog Output
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
3.16 Interrupt
3.16.1 Power up
During power up the INTB is kept low. Once the power up sequence is terminated the INTB is cleared
autonomously. The SX8660 is then ready for operation. The AOI levels are updated at the latest one scan period
after the rising edge of INTB.
During the power on period the SX8660 stabilizes the internal regulators, RC clocks and the firmware initializes all
registers.
During the power up the SX8660 is not accessible and I2C communications are forbidden.
As soon as the INTB rises the SX8660 will be ready for I2C communication.
The value of INTB before power up depends on the INTB pull up resistor supply voltage.
3.16.2 Assertion
INTB is updated in Active or Doze mode once every scan period.
The INTB will be asserted at the following events:
3.16.3 Clearing
The clearing of the INTB is done as soon as the host performs a read to any of the SX8660 I2C registers.
Revision v2.3, June 2010
• if a Button event occurred (touch or release if enabled). I2C register CapStatLsb show the detailed status of
• if a GPI edge occurred (rising or falling if enabled). I2C register GpiStat shows the detailed status of the GPI
• when actually entering Active or Doze mode via a host request (may be delayed by 1 scan period). I2C
• once compensation procedure is completed either through automatic trigger or via host request (may be
• once SPM write is effective (may be delayed by 1 scan period),
• once NVM burn procedure is completed (may be delayed by 1 scan period),
• during reset (power up, hardware RESETB, software reset).
the Buttons,
pins,
register CompOpmode shows the current operation mode,
delayed by 1 scan period),
Figure 22
© 2010 Semtech Corp.
(8 sensors) with Enhanced LED Drivers and Analog Output
Power Up vs. INTB
Ultra Low Power, Capacitive Button Touch Controller
23
DATASHEET
www.semtech.com
SX8660