sx8643 Semtech Corporation, sx8643 Datasheet - Page 25

• Manufacturer Part Number: sx8643
• Description: Ultra Low Power, Capacitive Button 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 26
Figure 25 LED Control in GPO mode,
GPO ON transition (LED fade in), normal polarity, (a) linear, (b) logarithmic
Table 8
SPM
I2C
Figure 24 LED Control in GPO mode,
SPM/I2C Parameters Applicable in GPP Mode
GpioIntensityOff
GpioIntensityOn
GpioOutPwrUp
GpioFunction
GppIntensity
GpioPolarity
© 2010 Semtech Corp.
GpioMode
GppPinId
Ultra Low Power, Capacitive Button Touch Controller
25
Autolight ON (mapped to Button)
(12 sensors) with Enhanced LED Drivers
Autolight OFF
GPP
X
X
X
X
X
X
X
X
1
1
1
1
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SX8643