On Mon, 06 Oct 2008 08:06:05 -0400, JW <none@[EMAIL PROTECTED]
> put finger to
keyboard and composed:
>On Sun, 05 Oct 2008 10:58:17 +1000 Franc Zabkar
><fzabkar@[EMAIL PROTECTED]
> wrote in Message id:
><284ge419rpa677hshuf3naj7htrqukhj6d@[EMAIL PROTECTED]
>:
>
>>I'm trying to identify two 6-pin SMT supervisor ICs in a D-Link
>>DSL-302G ADSL modem.
>>
>>They are U7 and U12, to the left of the Atmel EEPROM in this photo:
>>http://www.users.on.net/~fzabkar/DSL-302G/Photos/Atmel_Viking.JPG
>>
>>The markings are ...
>> _
>> 1KXW
>> -
>>
>>The pinouts appear to be as follows
>>
>> U7-1 NC (?)
>> 2 ground
>> 3 RST* to GS8120 CPU pin 53, VIA VT6103 pin 48, JP2-3
>> - pulled up to CPU Vcc by R51 (4K7)
>> 4 CPU Vcc
>> 5 NC (?)
>> 6 CPU Vcc
>>
>>U12-1 NC (?)
>> 2 ground
>> 3 RST* to GS8120 CPU pin 68
>> - pulled up to CPU Vcc by R30 (4K7)
>> 4 <-- R65 (3K0) --> ground
>> 5 NC (?)
>> 6 <-- R66 (4K7) --> unregulated 12VDC from bridge rectifier
>
>I can't help you with identifying those parts, but with a few mods
>(removing R65 for one) I bet you could use a couple of LM3724IM5-4.63
>devices.
Thanks, but I should have explained that I'm not trying to repair a
fault. I'm just trying to add a manual reset switch with the least
amount of effort. If the NC pins are internally debounced manual reset
inputs, then all I have to do is to add the switch. Otherwise I plan
to add a debounced reset input via JP2, without disturbing the PCB (my
eyesight isn't as good as it used to be).
- Franc Zabkar
--
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