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SX8663 bảng dữ liệu(PDF) 30 Page - Semtech Corporation

tên linh kiện SX8663
Giải thích chi tiết về linh kiện  Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer Output
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8663 bảng dữ liệu(HTML) 30 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
Rev5 4
th August 2011
© 2011 Semtech Corp.
www.semtech.com
30
SX8663
Capacitive Button Matrix (up to 36) and Proximity Controller
with Individual LED Drivers and Buzzer Output
4
PIN DESCRIPTIONS
4.1
Introduction
This chapter describes briefly the pins of the SX8663, 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,...,CAP11
The capacitance sensor pins (CAP0, CAP1,..., CAP11) 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 34 shows the simplified diagram of the CAP0, CAP1,...CAP11 pins.
SX8663
sensor
ASI
CAPx
CAP_INx
VANA
Note : x = 0, 1,2,…7
Figure 34
Simplified diagram of CAP0, CAP1,...,CAP11
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 SX8663.
The CN and CP are protected to VANA and GROUND.
Figure 35 shows the simplified diagram of the CN and CP pins.



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