CAP1128 datasheet(7/75 Pages) MICROCHIP

7 / 75 page

 2015 Microchip Technology Inc.

DS00001622B-page 7

CAP1128

APPLICATION NOTE: When the ALERT# pinis configured as an active low output, it will be open drain. When it is

configured as an active high output, it will be push-pull.

APPLICATION NOTE: For the 5V tolerant pins that have a pull-up resistor, the pull-up voltage must not exceed 3.6V

when the CAP1128 is unpowered.

APPLICATION NOTE: The SPI_CS# pin should be grounded when SMBus, or I2C,communications are used.

The pin types are described in Table 2-2. All pins labeled with (5V) are 5V tolerant.

CS3

Capacitive Touch Sensor Input 3

AIO

Connect to

Ground

CS2

Capacitive Touch Sensor Input 2

AIO

Connect to

Ground

CS1

Capacitive Touch Sensor Input 1

AIO

Connect to

Ground

VDD

Positive Power supply

Power

n/a

Bottom Pad

GND

Ground

Power

n/a

TABLE 2-2:

PIN TYPES

Pin Type

Description

Power

This pin is used to supply power or ground to the device.

Digital Input - This pin is used as a digital input. This pin is 5V tolerant.

AIO

Analog Input / Output -This pin is used as an I/O for analog signals.

DIOD

Digital Input / Open Drain Output - This pin is used as a digital I/O. When it is used as an out-

put, it is open drain and requires a pull-up resistor. This pin is 5V tolerant.

Open Drain Digital Output - This pin is used as a digital output. It is open drain and requires a

pull-up resistor. This pin is 5V tolerant.

Push-pull Digital Output - This pin is used as a digital output and can sink and source current.

DIO

Push-pull Digital Input / Output - This pin is used as an I/O for digital signals.

TABLE 2-1:

PIN DESCRIPTION FOR CAP1128 (CONTINUED)

Number

Pin Name

Pin Function

Pin Type

Unused

Connection

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