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SX8661Z Scheda tecnica(PDF) 30 Page - Semtech Corporation

Il numero della parte SX8661Z
Spiegazioni elettronici  Low Power, Capacitive Button Touch and Proximity Controller with LED Drivers and Analog Output
PDF  87 Pages
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Produttore elettronici  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8661Z Scheda tecnica(HTML) 30 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v4.0, February 2016
© 2012 Semtech Corp.
www.semtech.com
30
SX8661Z
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
3.17.2 GPO Dual Reporting
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. This is the dual reporting mode.
The SX8661Z offers additionally a triple reporting mode which allows the reporting of proximity by a medium
strong LED intensity (section 3.17.5).
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.
I2C
OFF
ON
OFF
SX8661
HOST
SX8661
HOST
GpoCtrl = 1
I2C
GpoCtrl = 0
Figure 29
LED Control in GPO mode, Autolight OFF
OFF
ON
OFF
Figure 30
LED Control in GPO mode, Autolight ON (mapped to Button)
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.
time
intensity ON
intensity OFF
fading steps
inc. time
time
intensity ON
intensity OFF
fading steps
inc. time
(a)
(b)
trigger
trigger
Figure 31
GPO ON transition (LED fade in), normal polarity, (a) linear, (b) logarithmic
time
intensity ON
intensity OFF
fading steps
inc. time
time
intensity ON
intensity OFF
fading steps
inc. time
(a)
(b)
trigger
trigger
Figure 32
GPO ON transition (LED fade in), inverted polarity, (a) linear, (b) logarithmic



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