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FEATURES

APPLICATIONS

DESCRIPTION/ORDERING INFORMATION

TCA8418

• Smart Phones

• Operating Power-Supply Voltage Range of

1.65 V to 3.6 V

• PDAs

• GPS Devices

• Supports QWERTY Keypad Operation Plus

GPIO Expansion

• MP3 Players

• Digital Cameras

• 18 GPIOs Can Be Configured into Eight Inputs

and Ten Outputs to Support an 8 × 10 Keypad

Array (80 Buttons)

• ESD Protection Exceeds JESD 22 on all 18

The

TCA8418

is

a

keypad

scan

device

with

GPIO Pins and non GPIO pins

integrated ESD protection. It can operate from 1.65 V

to 3.6 V and has 18 general purpose inputs/outputs

–

2000-V Human Body Model (A114-A)

(GPIO) that can be used to support up to 80 keys via

–

1000-V Charged Device Model (C101)

• Low Standby (Idle) Current Consumption: 3 µA

(SDA)].

• Polling Current Drain 70 µA for One Key

The

key

controller

includes

an

oscillator

that

Pressed

debounces at 50

µs and maintains a 10 byte FIFO of

• 10 Byte FIFO to Store 10 Key Presses and

key-press and release events which can store up to

10 keys with overflow wrap capability. An interrupt

Releases

(/INT) output can be configured to alert key presses

and releases either as they occur, or at maximum

• Open-Drain Active-Low Interrupt Output,

rate. Also, for the YFP package, a CAD_INT pin is

Asserted when Key is Pressed and Key is

included to indicate the detection of CTRL-ALT-DEL

Released

(i.e., 1, 11, 21) key press action.

• Minimum Debounce Time of 50 µs

The major benefit of this device is it frees up the

• Schmitt-Trigger Action Allows Slow Input

processor from having to scan the keypad for presses

and releases. This provides power and bandwidth

Transition and Better Switching Noise

savings. The TCA8418 is also ideal for usage with

Immunity at the SCL and SDA Inputs: Typical

processors that have limited GPIOs.

• Latch-Up Performance Exceeds 200 mA Per

JESD 78, Class II

• Very Small Packages

–

WCSP (YFP): 2 mm × 2 mm; 0.4 mm pitch

–

QFN (RTW): 4 mm × 4 mm; 0.5 mm pitch

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

QFN – RTW

Tape and reel

TCA8418RTWR

PZ418

–40°C to 85°C

WCSP – YFP

Tape and reel

TCA8418YFPR

PREVIEW

(1)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

(2)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.