SX8636I05AULTRT1 SEMTECH [Semtech Corporation], SX8636I05AULTRT1 Datasheet - Page 29

• Manufacturer Part Number: SX8636I05AULTRT1
• Description: Low Power, Capacitive Button Touch Controller (8 sensors) with Enhanced LED
• Manufacturer: SEMTECH [Semtech Corporation]

SX8636
Low Power, Capacitive Button Touch Controller (8 sensors)
with Enhanced LED Drivers and Proximity Sensing
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
3.17 Smart Wake Up
The SX8636 offers a smart wake up mechanism (up to 6 keys) which allows waking-up from the Doze low power
mode to the Active mode in a secure/controlled way and not by any unintentional sensor activation.
Until the full correct wake-up sequence is entered, the SX8636 will remain in Doze mode. Any wrong key implies
the whole sequence to be entered again.
Please note that each key touch must be followed by a release to be validated.
Hence if a proximity sensor and a touch button part of the wake-up sequence are interleaved on the PCB (ie if you
cannot touch the button without triggering proximity detection) the smart wake up feature cannot be used since
the proximity sensor is not “released” before the buttons are touched. In this case the smart wakeup sequence
must be turned OFF.
The smart wake-up mechanism can also be disabled which implies that Doze mode can hence only be exited
from GPI or I2C command.
Revision 7_5, September 10
© 2010 Semtech Corp.
www.semtech.com
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