sx8644 Semtech Corporation, sx8644 Datasheet - Page 26

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

ADVANCED COMMUNICATIONS & SENSING
The PWM blocks used in GPP and GPO modes are 8-bits based and clocked at 2MHz typ. hence offering 256
selectable pulse width values with a granularity of 128us typ.
3.16.2 GPI
GPIOs configured as GPI will operate as digital inputs with standard low and high logic levels.
Optional pull-up/down and debounce can be enabled. Each GPI is individually edge programmable for INTB
generation which will also exit Sleep/Doze mode if relevant.
SPM/I2C parameters applicable in GPI mode are listed in table below. Please refer to the relevant SPM/I2C
parameters sections for more details.
3.16.3 GPP
GPIOs configured as GPP will operate as PWM outputs directly controlled by the host. A typical application is
LED dimming.
Typical GPP operation is illustrated in figure below.
SPM/I2C parameters applicable in GPP mode are listed in table below. Please refer to the relevant SPM/I2C
parameters sections for more details.
Revision 7_3, January 10
Figure 27 PWM definition, (a) small pulse width, (b) large pulse width
Table 7
SPM
I2C
SPM/I2C Parameters Applicable in GPI Mode
Figure 28
GpioPullUpDown
GpioDebounce
GpioInterrupt
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
GpioMode
IrqSrc[4]
GpiStat
LED control in GPP mode
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Ultra Low Power, Capacitive Button and Slider
GPI
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DATASHEET
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SX8644