sx8645 Semtech Corporation, sx8645 Datasheet - Page 27

• Manufacturer Part Number: sx8645
• Description: Ultra Low Power, Capacitive Button And Wheel Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
3.16.4 GPO
GPIOs configured as GPO will operate as digital outputs which can generate both standard low/high logic levels
and PWM low/high duty cycles levels. Typical application is LED ON/OFF control.
Transitions between ON and OFF states can be triggered either automatically in Autolight mode or manually by
the host. This is illustrated in figures below.
Additionally these transitions can be configured to be done with or without fading following a logarithmic or linear
function. This is illustrated in figures below.
Revision 7_5, February 10
1
corresponding bits value.
At power up, GppIntensity of each GPP pin is initialized with GpioIntensityOn or GpioIntensityOff depending on GpioOutPwrUp
Figure 31
Figure 30 LED Control in GPO mode,
GPO ON transition (LED fade in), normal polarity, (a) linear, (b) logarithmic
Table 8
SPM
I2C
Figure 29 LED Control in GPO mode,
SPM/I2C Parameters Applicable in GPP Mode
GpioIntensityOff
GpioIntensityOn
GpioOutPwrUp
GpioFunction
Touch Controller (12 sensors) with Enhanced LED Drivers
GppIntensity
GpioPolarity
© 2010 Semtech Corp.
GpioMode
GppPinId
27
Ultra Low Power, Capacitive Button and Wheel
Autolight ON (mapped to Button)
Autolight OFF
GPP
X
X
X
X
X
X
X
X
1
1
1
1
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SX8645