SX8644I05AWLTRT Semtech, SX8644I05AWLTRT Datasheet - Page 27

• Manufacturer Part Number: SX8644I05AWLTRT
• Description: 12-ch Capacitive Touch Solution (Button & Slider)
• Manufacturer: Semtech

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_3, January 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
© 2009 Semtech Corp.
GpioMode
GppPinId
27
Ultra Low Power, Capacitive Button and Slider
Autolight ON (mapped to Button)
Autolight OFF
GPP
X
X
X
X
X
X
X
X
1
1
1
1
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SX8644