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working of keypad

by bstambur    Apr 8, 2009, 9:58 AM

Hi,

I thought the working of keypad of Mobile as below_
- If we press any key, a particular signal is sent to IC/chip of handset. And this signal is different for different keys to do different operations. Please let me know if I am wrong.
- Please let me know what type of signal is that. whether it is voltage or current or any other type...(Please this is urgent)

Thanks and regards
Basavaraj Tambur

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