sx8644 Semtech Corporation, sx8644 Datasheet - Page 13

• Manufacturer Part Number: sx8644
• Description: Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

SX8644
Ultra Low Power, Capacitive Button and Slider
Touch Controller (12 sensors) with Enhanced LED Drivers
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
To leave Doze mode and enter Active mode this can be done by a simple touch on any button.
For some applications a single button touch might cause undesired wakening up and Active mode would be
entered too often.
The SX8644 offers therefore a smart wake-up sequence feature in which the user needs to touch and release a
correct sequence of buttons before Active mode will be entered. This is explained in more detail in the Wake-Up
Sequence section.
The host can decide to force the operating mode by issuing commands over the I2C (using register
CompOpMode) and take fully control of the SX8644.
The diagram in Figure 8 shows the available operation modes and the possible transitions.
Operation modes
Figure 8
Revision 7_3, January 10
© 2009 Semtech Corp.
www.semtech.com
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