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SCPS215 – SEPTEMBER 2009
I
2
C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION
1
FEATURES
APPLICATIONS
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Smart Phones
Operating Power-Supply Voltage Range of
1.65 V to 3.6 V
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PDAs
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GPS Devices
Supports QWERTY Keypad Operation Plus
GPIO Expansion
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MP3 Players
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Digital Cameras
18 GPIOs Can Be Configured into Eight Inputs
and Ten Outputs to Support an 8 × 10 Keypad
DESCRIPTION/ORDERING INFORMATION
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)
the I
2
C interface [serial clock (SCL), serial data
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
Supports 1-MHz Fast Mode Plus I
2
C Bus
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.
V
hys
at 1.8 V is 0.18 V
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
T
A
PACKAGE
(1) (2)
QFN – RTW
WCSP – YFP
Tape and reel
Tape and reel
ORDERABLE PART NUMBER
TCA8418RTWR
TCA8418YFPR
TOP-SIDE MARKING
PZ418
PREVIEW
–40°C to 85°C
(1)
(2)
Package drawings, thermal data, and symbolization are available at
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
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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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
