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SX8661Z bảng dữ liệu(PDF) 35 Page - Semtech Corporation

tên linh kiện SX8661Z
Giải thích chi tiết về linh kiện  Low Power, Capacitive Button Touch and Proximity Controller with LED Drivers and Analog Output
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v4.0, February 2016
© 2012 Semtech Corp.
www.semtech.com
35
SX8661Z
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
4
PIN DESCRIPTIONS
4.1
Introduction
This chapter describes briefly the pins of the SX8661Z, the way the pins are protected, if the pins are analog,
digital, require pull up or pull down resistors and show control signals if these are available.
4.2
ASI pins
CAP0, CAP1,...,CAP7
The capacitance sensor pins (CAP0, CAP1,...,CAP7) are connected directly to the ASI circuitry which converts
the sensed capacitance into digital values.
The capacitance sensor pins which are not used should be left open.
The enabled CAP pins need be connected directly to the sensors without significant resistance (typical below
some ohms, connection vias are allowed).
The capacitance sensor pins are protected to VANA and GROUND.
Figure 39 shows the simplified diagram of the CAP0, CAP1,...CAP7 pins.
SX8661Z
sensor
ASI
CAPx
CAP_INx
VANA
Note : x = 0, 1,2,…7
Figure 39
Simplified diagram of CAP0, CAP1,...,CAP7
CN, CP
The CN and the CP pins are connected to the ASI circuitry. A 1nF sampling capacitor between CP and CN needs
to be placed as close as possible to the SX8661Z.
The CN and CP are protected to VANA and GROUND.
Figure 40 shows the simplified diagram of the CN and CP pins.



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