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Franc Zabkar
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 Posted: Sun Oct 05, 2008 5:58 am Post subject: Need help to identify supervisor IC |
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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 suspect that the reset output is open collector or open drain, as it
is bussed to connector JP2 which is provided for EEPROM programming
via an external jig. I>m guessing that the NC pins may be manual reset
pins, and/or RC time constant pins.
The CPU/DSP, GS8120, is from a Globespan Virata Viking chipset. Does
anyone have a datasheet for this chip?
- Franc Zabkar
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Please remove one 'i' from my address when replying by email. |
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Eeyore
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| Posted: Sun Oct 05, 2008 7:05 am Post subject: Re: Need help to identify supervisor IC |
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Franc Zabkar wrote:
[quote]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
[/quote]
Can you do more of a macro pic ?
Graham |
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Franc Zabkar
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| Posted: Sun Oct 05, 2008 7:22 am Post subject: Re: Need help to identify supervisor IC |
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On Sun, 05 Oct 2008 03:05:37 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> put finger to keyboard and
composed:
[quote]Franc Zabkar wrote:
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
Can you do more of a macro pic ?
Graham
[/quote]
The other photos are here:
http://www.users.on.net/~fzabkar/DSL-302G/Photos/
This is the entire PCB:
http://www.users.on.net/~fzabkar/DSL-302G/Photos/PCB_Component.jpg
- Franc Zabkar
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Please remove one 'i' from my address when replying by email. |
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Franc Zabkar
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| Posted: Sun Oct 05, 2008 7:22 am Post subject: Re: Need help to identify supervisor IC |
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On Sun, 05 Oct 2008 14:05:22 +1000, Franc Zabkar
<fzabkar@iinternode.on.net> put finger to keyboard and composed:
[quote]On Sun, 05 Oct 2008 03:05:37 +0100, Eeyore
rabbitsfriendsandrelations@hotmail.com> put finger to keyboard and
composed:
Franc Zabkar wrote:
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
Can you do more of a macro pic ?
Graham
The other photos are here:
http://www.users.on.net/~fzabkar/DSL-302G/Photos/
This is the entire PCB:
http://www.users.on.net/~fzabkar/DSL-302G/Photos/PCB_Component.jpg
[/quote]
I tried getting a better close-up, but the image just blurs.
- Franc Zabkar
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Please remove one 'i' from my address when replying by email. |
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Franc Zabkar
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| Posted: Sun Oct 05, 2008 12:56 pm Post subject: Re: Need help to identify supervisor IC |
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On Sun, 05 Oct 2008 10:58:17 +1000, Franc Zabkar
<fzabkar@iinternode.on.net> put finger to keyboard and composed:
[quote]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
[/quote]
This is a similar PCB with U12 unpopulated:
http://www.abusar.org/manuais/cabo/cabo-no-modem.JPG
It shows that pins 4 & 6 are linked at the resistor pads, which
suggests that the two resistors form a potential divider, and that U12
lets the CPU know when the +12V input is low.
- Franc Zabkar
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Please remove one 'i' from my address when replying by email. |
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JW
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| Posted: Mon Oct 06, 2008 5:06 pm Post subject: Re: Need help to identify supervisor IC |
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On Sun, 05 Oct 2008 10:58:17 +1000 Franc Zabkar
<fzabkar@iinternode.on.net> wrote in Message id:
<284ge419rpa677hshuf3naj7htrqukhj6d@4ax.com>:
[quote]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
[/quote]
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. |
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Franc Zabkar
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| Posted: Tue Oct 07, 2008 12:44 am Post subject: Re: Need help to identify supervisor IC |
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On Mon, 06 Oct 2008 08:06:05 -0400, JW <none@dev.null> put finger to
keyboard and composed:
[quote]On Sun, 05 Oct 2008 10:58:17 +1000 Franc Zabkar
fzabkar@iinternode.on.net> wrote in Message id:
284ge419rpa677hshuf3naj7htrqukhj6d@4ax.com>:
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.
[/quote]
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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Please remove one 'i' from my address when replying by email. |
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