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TCA8424

更新时间： 2024-11-21 12:30:23
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
30页 925K
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Check for Samples: TCA8424

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TCA8424 数据手册

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TCA8424  
www.ti.com  
SCDS341 –MARCH 2013  
Low-Voltage 8x16 Keyboard Scanner with HID over I2C Compliant Interface  
Check for Samples: TCA8424  
1
FEATURES  
•
Operating Power-Supply Voltage Range of  
•
ESD Protection Exceeds JESD 22  
1.65V to 3.6V  
–
1000-V Human-Body Model (A114-A)  
•
•
•
•
•
•
Supports FM+ I2C Operation up to 1MHz  
Can Support up to 128 (8x16) Key Scan  
Internal Power-On-Reset  
RHB 5mmx5mm  
RSM 4mmx4mm  
PREVIEW  
Open Drain Open Drain Active Low INT Output  
Noise Filter on SCL/SDA and Inputs  
0.50  
32X  
0.30  
1
Open Drain Outputs Can Sink up to 12mA  
Current for LED  
32  
Thermal Pad  
•
•
•
•
Hardware Coded HID and REPORT Descriptors  
Available With Preprogrammed Keyboard Map  
Software Reset per HID Over I2C Standard  
SIZE AND SHAPE  
3.50  
4X  
SHOWN ON SEPARATE SHEET  
Internal Pull-up Resistors Make  
Implementation Easy With no Need for  
External Components  
0.50  
0.30  
0.10  
M C A B  
32X  
0.18  
•
HID Over I2C Commands Supported  
–
–
–
–
RESET  
RHA 6mm x 6mm  
GET REPORT  
SET REPORT  
SET POWER  
•
Fixed Length 8-byte INPUT Report can Detect  
up to 6 Simultaneous Key Presses Excluding  
Modifiers (CTRL, ALT, SHIFT)  
•
•
INPUT Report Generated on Key Press and  
Release  
Latch-Up Performance Exceeds 100 mA Per  
JESD 78, Class II  
DESCRIPTION  
This 128 key scan device is specifically targeted towards end equipment that runs on Windows 8 operating  
system. The device is fully compliant with the HID over I2C specification defined (ver 1.0) defined by Microsoft.  
The HID and report descriptors are hard coded into the device so that they don’t need to be programmed at  
production. The device also comes with a preprogrammed keyboard map that is compatible with most standard  
laptop/notebook keyboards. However, the device also available without a pre-programmed keyboard, so that any  
keyboard map may be written into it at production.  
The device generates INPUT reports of standard 8-byte length with the 1st byte being the modifier byte. After the  
keyboard map is programmed into the device it automatically recognizes the row/column location of the modifier  
keys based on their usage code. It is capable of detecting and reporting up to six simultaneous key presses plus  
eight modifiers. It generates an input report on each key press and each key release.  
The device also supports LED indicators that are standard on a keyboard. Different variations support 2,4 or 8  
LED outputs. Each output has open drain architecture and is capable of sinking up to 12mA of current. The LEDs  
are controlled by a standard OUTPUT report as described in the HID over I2C standard.  
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 © 2013, 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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