Need help to identify supervisor IC

F

Franc Zabkar

Guest
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
--
Please remove one 'i' from my address when replying by email.
 
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
Click to expand...
Can you do more of a macro pic ?

Graham
 
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
Click to expand...
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
--
Please remove one 'i' from my address when replying by email.
 
On Sun, 05 Oct 2008 14:05:22 +1000, Franc Zabkar
<fzabkar@iinternode.on.net> put finger to keyboard and composed:

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
Click to expand...
I tried getting a better close-up, but the image just blurs.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On Sun, 05 Oct 2008 10:58:17 +1000, Franc Zabkar
<fzabkar@iinternode.on.net> put finger to keyboard and composed:

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
Click to expand...
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
--
Please remove one 'i' from my address when replying by email.
 
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
Click to expand...
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.
 
On Mon, 06 Oct 2008 08:06:05 -0400, JW <none@dev.null> put finger to
keyboard and composed:

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.
Click to expand...
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
--
Please remove one 'i' from my address when replying by email.
 
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