TCA8418 损坏率较高的问题

我们最近发现TCA8418在生产中损坏率较高，并发现TI又推出TCA8418E，ESD升级版本。

  问题是；

     1  TCA8418是否存在隐患？

     2  是否有何TCA8418管脚一样，且ESD升级的计划？

Why Was This Part Developed? (What problem does it solve)

The major benefit of this device is it frees up the processor from having to scan the keypad for presses and releases. This enables a lower power system. By offloading key scan management from the processor, this frees MIPs of the processor to focus on more time critical processes as well as simplifying the software overhead required to manage the keyboard. In addition, it is ideal for usage with processors that have limited GPIOs. The supply voltage range of 1.65V to 3.6V makes it ideal for interfacing with today's most advanced, low-voltage processors and eliminates the need for external voltage translation devices further saving BOM cost and board space. Also, with its enhanced ESD protection and small package size, it makes it a complete keypad controller solution.

TI Information - Selective Disclosure. Information believed to be

accurate when created; see Important Notice at bottom of

product folder.

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Analog Devices (ADI) ADP5588 Mobile I/O Expander and QWERTY Keypad Controller; Our ESD spec is 4 times higher (8kV to their 2kV), and our package is 4 times smaller (4 square-mm to their 16 square-mm); Our ESD spec is 4 times higher (8kV to their 2kV), and our package is 4 times smaller (4 square-mm to their 16 square-mm)

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Maxim MAX7359 Low-Voltage, Low-EMI, and Low-Supply Current Key-Switch Controller Monitors Up to 64 Keys Without External Components; 16 less supported keys than ours. No ESD spec, where ours is 8kV. Our WCSP is smaller (2mm x 2mm to their 2.31mm x 2.31mm); 16 less supported keys than ours. No ESD spec, where ours is 8kV. Our WCSP is smaller (2mm x 2mm to their 2.31mm x 2.31mm)

Rock,

TCA8418E是TI针对市场需求推出了更有竞争力的芯片，不但在ESD性能方面大大提升，同时增加了3键命令（CTL-ALT-DEL），采用WCSP (YFP): 2 mm × 2 mm封装。

TCA8418是TI在2009年推出了当时业界最小封装I2C键盘扫描控制器， ESD能力超出了JESD 22业界标准 （2KV-HBM)，现已广泛被客户使用。

因此，具体选用哪个器件，要根据具体功能需求（如是否支持3键操作?）、I/O的ESD防护要求（TCA8418E的ESD达到6KV）、价格等等因素综合考虑。

若对具体的项目设计选型不确定，可以跟TI的销售联系，谢谢！

best regards,

Steven