SX8661I07AULTRT Semtech, SX8661I07AULTRT Datasheet - Page 27

• Manufacturer Part Number: SX8661I07AULTRT
• Description: IC, Capacitive Button Touch And Proximity Controller, 8 SENSOR, MLPQ-28
• Manufacturer: Semtech

Specifications of SX8661I07AULTRT

• Controller Type: Capacitive Touch Screen
• Ic Interface Type: I2C
• Supply Voltage Range: 2.7V To 3.6V
• Operating Temperature Range: -40°C To +85°C

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 SX8661 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 SX8661 stabilizes the internal regulators, RC clocks and the firmware initializes all
registers.
During the power up the SX8661 is not accessible and I2C communications are forbidden. The GPIOs set as
inputs with a pull up resistor.
As soon as the INTB rises the SX8661 will be ready for I2C communication. The GPIOs are then configured
according the parameters in the SPM.
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 SX8661 I2C registers.
Revision v3.2, January 2011
• if a Button event occurred (touch or release if enabled). I2C register CapStatLsb show the detailed status of
• 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,
register CompOpmode shows the current operation mode,
delayed by 1 scan period),
Low Power, Capacitive Button Touch and Proximity Controller
Figure 23
© 2011 Semtech Corp.
Power Up vs. INTB
27
(8 sensors) with LED Drivers and Analog Output
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DATASHEET
SX8661