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TCA8418 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
描述:
具有集成 ESD 保护的 I2C 控制键盘扫描 IC
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
封装尺寸在P32P33P34
封装信息在P32P33P34
应用领域在P37
导航目录
TCA8418数据手册
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1
FEATURES APPLICATIONS
DESCRIPTION/ORDERING INFORMATION
TCA8418
www.ti.com
......................................................................................................................................................................................... SCPS215 – SEPTEMBER 2009
I
2
C CONTROLLED KEYPAD SCAN IC WITH INTEGRATED ESD PROTECTION
• 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)
the I
2
C interface [serial clock (SCL), serial data
• Low Standby (Idle) Current Consumption: 3 µ A
(SDA)].
• Polling Current Drain 70 µ A for One Key
The key controller includes an oscillator that
Pressed
debounces at 50 µ s 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 µ s
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)
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 .
1
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.
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