AR1010T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

AR1010T-I/SO

AR1000 Series Resistive Touch Screen Controller

Microchip Technology 

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

4.0 I2CTM COMMUNICATIONS

The AR1021 is an I2C slave device with a 7-bit address

of 0x4D, supporting up to 400 kHz bit rate.

A master (host) device interfaces with the AR1021.

4.1 I2C Hardware Interface

A summary of the hardware interface pins is shown

below in Table 4-1.

TABLE 4-1: I2C HARDWARE INTERFACE

AR1021 Pin

M1

SCL

SDA

SDO

Description

Connect to VSS to select I2C™ communications

Serial Clock to master I2C

Serial Data to master I2C

Data ready interrupt output to master

M1 Pin

• The M1 pin must be connected to VSS to config-

ure the AR1021 for I2C communications.

SCL Pin

• The SCL (Serial Clock) pin is electrically

open-drain and requires a pull-up resistor, typi-

cally 2.2 K to 10 K, from SCL to VDD.

• SCL Idle state is high.

SDA Pin

• The SDA (Serial Data) pin is electrically

open-drain and requires a pull-up resistor, typi-

cally 2.2K to 10K, from SDA to VDD.

• SDA Idle state is high.

• Master write data is latched in on SCL rising

edges.

• Master read data is latched out on SCL falling

edges to ensure it is valid during the subsequent

SCL high time.

SDO Pin

• The SDO pin is a driven output interrupt to the

master.

• SDO Idle state is low.

• SDO will be asserted high when the AR1021 has

data ready (touch report or command response)

for the master to read.

 2009-2012 Microchip Technology Inc.

Preliminary

DS41393B-page 17

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