IS31IO7326 datasheet(1/14 Pages) ISSI

Part #	IS31IO7326

Description	DEBOUNCED 8횞8 KEY-SCAN CONTROLLER

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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IS31IO7326

Integrated Silicon Solution, Inc. – www.issi.com

Rev.A, 12/19/2011

1

DEBOUNCED 8×8 KEY-SCAN CONTROLLER

January 2012

GENERAL DESCRIPTION

The 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.

The IS31IO7326 integrates a debounce function which

rejects false or transient key switch activities. The

interrupt output (INT

_______

) is used to signify if there are any

keypad activities.

To minimize power, the IS31IO7326 automatically

enters a low power standby mode when there is no

keypad, I/O, or host activity.

The IS31IO7326 is available in a Pb-free 4mm × 4mm

QFN-24 package.

TYPICAL APPLICATION CIRCUIT

FEATURES



2.4V to 5.5V operation



400kHz I

2C 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

APPLICATIONS



Keypad of QWERTY type phones



PDAs, games, and other handheld applications

PP0

PP1

PP2

PP3

OD0

OD1

OD2

PP4

PP5

PP6

PP7

OD4

OD5

OD6

OD7

OD3

SCL

SDA

INT

RST

AD0

AD1

GND

VCC

Micro

Controller

100k

1 F

4.7k

IS31IO7326

13

12

11

10

8

7

6

5

1

2

3

4

14

15

16

17

19

20

22

23

18

24

9

21

VBattery

VDD

VBattery

100k

0.1 F

Figure 1

Typical Application Circuit

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IS31IO7326 Datasheet(PDF) 1 Page - Integrated Silicon Solution, Inc

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