JACK_INSERT and HOLD underlying issues

張吉隆 allen_chang at mc.fic.com.tw
Thu Feb 28 16:07:13 CET 2008

Werner Almesberger 提到:
> Andy Green wrote:
>> anything with HOLD we must have MICBIAS powered.  Even then maybe we
>> don't make enough high level to detect a logic '1' at CPU interrupt
>> input considering the load of the Mic.
> Hmm, 3.3V/(2.2+.9)*.9 = 0.96V into a pin with Vil(max) = 0.8V and
> Vih(min) = 2V looks more like an all-time low :-(
> The circuit is almost identical to GTA01. I wonder how well we're
> doing there. I don't remember any major complaints about HOLD, but
> then, perhaps nobody tried ?
> - Werner
For HOLD function, we must have MICBIAS powered. In GTA01, we don't has 
any pull high resistor in IO_3V3.
Because the HOLD function just for holds the phone or take a phone and 
we don't use it to wake up CPU.

Best Wishes
           Allen Chang

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