ISSI IS31IO7326 Manual

IS31IO7326 Debounced 8x8 Key-Scan Controller Evaluation Board Guide

Description

IS31IO7326 is a 64 key, key-scan controller. It offloads
the burden of keyboard scanning from the host
processor. The IS31IO7326 supports keypad matrix of
up to 8×8. Key press and release events are encoded
into a byte format and loaded into a key event register
for retrieval by the host processor.
To minimize power, the IS31IO7326 automatically
enters a low power standby mode when there is no
keypad, I/O, or host activity.

Features

•
Supply voltage range from 3.0V to 5.5V
•
2
400kHz I C serial interface
•
Available for multi-key press detect
•
Low 0.3µA (typ.) standby current
•
Operate in -40°C to +125°C
•
Pb-free 4mm × 4mm QFN-24 package
Quick Start
Figure 1: Photo of IS31IO7326 Evaluation Board
Evaluation Board Ordering Information
For pricing, delivery, and ordering information, please contacts ISSI's analog marketing
team at analog_mkt@issi.com
Integrated Silicon Solution, Inc. – www.issi.com
R1.0, 08/23/2012
Part No.
IS31IO7326-QFLS4-EB QFN-24, Lead-free
Table1: Ordering Information
or (408) 969-6600.

Recommended Equipment

•
5.0V, 2A power supply

Absolute Maximum Ratings

•
≤ 5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.

Procedure

The IS31FL7326 evaluation board is fully assembled
and tested. Follow the steps listed below to verify
board operation.
Caution: Do not turn on the power supply until all connections
are completed.
1) Connect the ground terminal of the power supply
to the GND and the positive terminal to the VCC.
Or connect the DC power to the connector (DC
IN).
2) Turn on the power supply and pay attention to the
supply current. If the current exceeds 200mA,
please check for circuit fault.
IC Package
1