sx8638 Semtech Corporation, sx8638 Datasheet - Page 27

• Manufacturer Part Number: sx8638
• Description: Low Power, Capacitive Button And Slider Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity
• 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_6, September 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
GppIntensity
GpioPolarity
© 2010 Semtech Corp.
GpioMode
Low Power, Capacitive Button and Slider Touch Controller
GppPinId
(8 sensors) with Enhanced LED Drivers and Proximity
27
Autolight ON (mapped to Button)
Autolight OFF
GPP
X
X
X
X
X
X
X
X
1
1
1
1
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SX8638