Need some help searching identification

Hi the Group,

On the following module (see the picts into the links below) I'm
searching to identify the following components:

IC1: L02
BV67W
Probably a PIC (?), nevertheless for sure a programmable component.

D4: 6F
42

D3: R12

D2: 6.2B
or
8.2B
93
Difficult to read clearly even under the binocular.

Here are the picts:

Pile: http://cjoint.com/?AKwxdrhymgr

Face: http://cjoint.com/?AKwxfvUq7kI


The most important is IC1.

D3 has six pins, very strange for a rectifier, my smd code book doesn't
have an "R12".

Many thanks for your help.
Pierre-Francois, f5bqp

 

Serial EEPROM with I2C bus, some variant of 24C02, perhaps BR24L02

npn transistor BC818-25

 

Le 23/11/2011 07:57, "Pierre-François (f5bqp_pfm)" a écrit :

Hi the Gang,

Many thanks for these first replies, I'll continue to investigate, your
guesses are interesting and bring me on the good direction.
If any other ideas don't hesitate, you're welcome.

All the bests and thanks again.
pf, f5bqp

 

Le 23/11/2011 15:17, Morten Leikvoll a écrit :

Hi Morten & the Gang,

I forgot to answer your question, so here it's:
This small module is a dongle associates to a DVDROM which contain the
update of the cartography for a car GPS.

When you open the motorized screen which flip from 90°, you have on the
side of the GPS screen a 3.5mm jack socket to plug this dongle.
then you insert your DVDROM to update the hard-disk of the GPS unit.
The 3.5mm jack is a 4 pins jack going to the 4 color wires you can see.
The 3.5mm jack isn't on the picture.

Hope you understand better the functionality of this small module.
This is a key, you update once then you cannot update another GPS system...
The problem is that I'm going to add from time to time some remarkable
points to the cartography, then I'll update much more than once!
So I need to find a way to update that dongle.

Tomorrow I'll remove that white label to do another pict for you.

All the bests
pf

 

D4 looks like a dual diode with common cathode, or could it be a dual
zener with common anode ???

If D3 is some kind of diode array, then your multimeter may be able to
tell you where the PN junctions are.

- Franc Zabkar

 

Le 23/11/2011 11:05, Piotr Piatek a écrit :

Hi Piotr,

I've checked the BC818-25 datasheet, they're saying 6Fs for the marking,
so I don't know.

Concerning the 24C02 & the BR24L02 these are serious possible
candidates, however the both datasheet don't mention any marking code so
I don't know either.
But it's very probable it's an I2C EEPROM thinking to the function this
small dongle is doing.

All the bests.
pf, f5bqp

 

The marking 6F looked familiar to me, because we use these transistors
at work, but I think that I was wrong. It's more likely some dual
diode, as Franc Zabkar suggested.

 

Le 23/11/2011 15:17, Morten Leikvoll a écrit :

Hi,

Here is as promised yesterday night the pict with the white sticker
removed, we can see that D2 is in // with C2, so D2 could be a transient
suppressor on to the power lines "just in case"?... Or a Zener at 6.2v
as you mentioned earlier.

http://cjoint.com/?AKyoKzTaOsx

Another pict showing the 3.5 jack:

http://cjoint.com/?AKyoS7CQtgN

pf

 

Le 24/11/2011 11:25, Piotr Piatek a écrit :

Hi Piotr,

No problem, the investigation is continuing...

pf

 

Le 24/11/2011 11:40, Morten Leikvoll a écrit :

Hi Morten,

Wouhaa! First time I see such a silicon registering tool!
Today you make me less crazy than this morning! Thanks for that... ;-)

Yes and no, because each time you get a new DVDROM you get a new dongle,
so the serialnumber IC isn't attached to the GPS.

May be to the DVDROM itself, could be, but the DVD production should be
a mess in that case...

pf

 

Hi Again Morten,

I measured precisely the D3 packaging with a caliper, and it's smaller.
1.3mm large , 2.0mm Long

The PIC10F is SOT23 packaging which is 1.3mm large BUT 2.7mm Long.
On the same side of this tiny board where D3 we're trying to identify is
you have D4 which is an SOT23 packaging, you can see it's bigger.

pf





Le 24/11/2011 15:17, Morten Leikvoll a écrit :

 

ISTM that the whole thing may be as simple as a solitary I2C EEPROM.

I'm guessing D3 is a diode array that protects the clock and data
inputs from ESD.


Vcc ---|<|---o---|<|--- Gnd
|
|
|

SCL / SDA

I think you're correct in that D2 appears to be a transient voltage
suppressor (or maybe a zener). Its breakdown voltage is probably 6.2V
whereas the supply voltage for the EEPROM would be 5V or 3.3V.

- Franc Zabkar

 

It's not the same part, but it has an R12 marking:

SR12, RailClamp, Semtech, Low Capacitance TVS Diode Array:
http://www.semtech.com/images/datasheet/sr12.pdf

- Franc Zabkar

 

Try pulling up the EEPROM's Write Protect pin to Vcc. That should
disable any writes.

BTW, there is a 51 ohm resistor in series with the Vcc input. This
would suggest that the current draw of the entire PCB needs to be very
low. For example, a current draw of 10mA would result in an
unacceptably high voltage drop of 0.5V. According to the data sheet of
the BR24L02, the voltage drop across the 51 ohm resistor during write
mode would be about 60mV. That sounds OK.

256×8 bit electrically erasable PROM
BR24L02-W / BR24L02F-W / BR24L02FJ-W
BR24L02FV-W / BR24L02FVM-W:
http://www.rohm.com/products/databook/eeprom/pdf/br24l-e.pdf

- Single power supply (1.8V to 5.5V)
- Write (5V) : 1.2mA (Typ.)
- Read (5V) : 0.2mA (Typ.)

- Franc Zabkar

 

Le 25/11/2011 09:29, Franc Zabkar a écrit :

Hi Franc,

The Semtech could be a good candidate for the function, however it has
only 4 pins, D3 has 6, and D3 is much more tiny, the Semtech is SOT143
2.8mm long .

pf

 

That's why I wrote that "it's not the same part". Nevertheless I
suspect your part would have a similar function. In any case, what is
preventing you from performing a simple test with a multimeter? AISI
the circuit is essentially just an EEPROM on a stick and should not
require much effort to "reverse engineer".

- Franc Zabkar

 

Here is my best guess as to your circuit layout:



Vcc 51R 51R
___ Vcc1 ___ Vcc2
Red (4) o-|___|--+---+-----|___|---+--------> to EEPROM pin #8
R1 | | R2 |
| | |
| | D2 |
--- z ---
C2 --- A 6.2B --- C3
| | |
R10 | | R11 |
___ | | ___ |
Blk (2) o-|___|--+---+-----|___|---+--------> to EEPROM pin #4
51R Gnd1 51R Gnd2
Gnd



Vcc1
-+-
|
|
-
SDA 51R ^ 51R
___ D3-A| ___
Yel (1) o-|___|--------+--------|___|----+---+------> EEPROM pin #5
R8 | R4 | |
- - ---
^ D4-A ^ --- C5
| | |
| --+--
-+- |
Gnd1 -+-
Gnd2



Vcc1
-+-
|
|
-
SCL 51R ^ 51R
___ D3-B| ___
Blu (3) o-|___|--------+--------|___|----+---+------> EEPROM pin #6
R7 | R3 | |
- - ---
^ D4-B ^ --- C4
| | |
| --+--
-+- |
Gnd1 -+-
Gnd2



Vcc2
-+-----------------------+---+----+
| | | |
| | R5| |R6
.-. | .-. .-.
1K | | R9 | | | | | 2K2
| | | | | | |
'-' .-------V-------. | '-' '-'
| | | | | |
-----| 1 A0 Vcc 8 |--- | |
| | | |
.--| 2 A1 WP 7 |--. | |
| | | | | |
|--| 3 A2 SCL 6 |--)---'----)------> to D3-B via R3
| | | | |
|--| 4 Gnd SDA 5 |--)--------'------> to D3-A via R4
| '---------------' |
| BR24L02 |
| +--'-+
| | |
| .-. |
| R12 | | --- C1
| 10K | | ---
| '-' |
| | |
'------------------+----+
Gnd2


(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)


I suspect that the pinout of D3 is as follows:


D D
pin2 ---|<|---o---|<|--- pin1 D3-A
|
pin3


D D
pin5 ---|<|---o---|<|--- pin4 D3-B
|
pin6


I confess that I don't understand the purpose of D4.

- Franc Zabkar

 

Le 26/11/2011 11:58, Franc Zabkar a écrit :

Hi Franc,

Back to home after two days outside I'll look at that, thanks for your
work, I appreciate very much.

All the bests.
pf

 

Le 25/11/2011 21:06, Franc Zabkar a écrit :

Yes I'm going to do it.
pf

AISI