SX8661I07AULTRT Semtech, SX8661I07AULTRT Datasheet - Page 37

• Manufacturer Part Number: SX8661I07AULTRT
• Description: IC, Capacitive Button Touch And Proximity Controller, 8 SENSOR, MLPQ-28
• Manufacturer: Semtech

Specifications of SX8661I07AULTRT

• Controller Type: Capacitive Touch Screen
• Ic Interface Type: I2C
• Supply Voltage Range: 2.7V To 3.6V
• Operating Temperature Range: -40°C To +85°C

SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
4 P
IN DESCRIPTIONS
4.1 Introduction
This chapter describes briefly the pins of the SX8661, 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 41 shows the simplified diagram of the CAP0, CAP1,...CAP7 pins.
SX8661
VANA
sensor
CAPx
ASI
CAP_INx
Note : x = 0, 1,2,…7
Simplified diagram of CAP0, CAP1,...,CAP7
Figure 41
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 SX8661.
The CN and CP are protected to VANA and GROUND.
Figure 42 shows the simplified diagram of the CN and CP pins.
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
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