Datasheet for Toshiba DC2209P456A

[silence012]

Hi all,

I recently started a project of reverse engineering the micro controllers code from Toshiba vintage laptops PSUs. With some help, I managed to get binaries from T1600's IC13 (TMP90C840) and both micro controllers
from Toshiba T3100SX (TMP91P640 and TMP47P860). These two PSUs seem very similar. In fact, probably most of the laptops of that era has a similar code in the PSU controllers.

The goal is to understand what these micro controllers do, which things they check and how communication with motherboard works. Knowing that, we can create some guides how to fix broken PSU, and even design
modern PSU replacement that support modern batteries.

I started with T1600 first as there is more-less the whole schematics available (kudos to Thom Wijtenburg aka. Fust). I found that in the initialization process of controller, it sends few signals to IC3 which is in fact Toshiba DC2209P456A. It looks like some
Toshiba's proprietary gate array but I cannot find any information about it. Does anyone have datasheet for that IC? Any kind of information would be beneficial.

Thanks in advance,
Branko

 

[8BitSzop]

Hi, generally, creating a replacement power supply doesn't require the controller codes, at least for the older models. This is because these power supplies do not communicate digitally with the mainboard in any way. Regarding the three controllers you mentioned above, they are responsible for:
- Providing the appropriate PWM signals to the voltage converters for 22V, 5V, 12V, -9V, and -22V;
- Monitoring the above voltages and controlling the PWM signals to the switching MOSFETs, enabling the voltages on specific power sections;
- Monitoring the main battery charging.

The only communication with the mainboard involves supplying the correct voltages, possibly receiving a signal from the display lid switch, and controlling the relevant LEDs on the informational panel.
I also searched for information about the DC2209P456A circuit but couldn't find anything. Generally, it is responsible for supplying 10 MHz clock signals to the TMP90C and several 78 kHz signals to the voltage converters. I am currently working on creating a repair guide for the Toshiba T1200XE power supply (which has very similar logic to the T1600). I still need to develop the operating principle for battery charging control.

 

[silence012]

@8BitSzop Thanks for info. I am not sure if there is any communication with motherboard/CPU regarding HDD sleep, LCD sleep etc.

Anyway, it would be nice to understand what exactly these controllers check and in which order.

I have for example one T1200XE PSUs and two from T1200 that they both show initial voltage on all rails but still do not power up. So probably some circuit between the controllers and rails is broken. Looking forward to your fixing guide.

 

[8BitSzop]

@silence012 In the Toshiba 1200XE, the logic roughly looks like this:
-the voltages on the MOSFET transistors are checked (to see if there is voltage where it shouldn't be);
-the VRAM voltage (linear regulator) is checked;
-a 12V voltage is turned on to drive the internal 18V control voltage that manages the other converters, and it is active.
- the VCC 5V voltage is active;
- the 12V voltage is active
-the -9V and -22V voltages are active
the PWM signal is checked to see if it appears on the MOSFETs.
If any PWM signal is missing, the power supply shuts down after about a few dozen milliseconds and the red LED flashes, despite correct voltages on the rails. All PWM signals pass through the CD4049 circuit.

Due to other issues, I had to pause work on the T1200XE, but I think I will return to it in two weeks.
I hope that together we will be able to figure this out.

 

[silence012]

@8BitSzop thanks again. This looks similar as on T1600, but I think in T1600 the 12V rail does not turn first but I think it also uses 18V rail, and 18V rail gets power for whatever source is (AC or battery).

Do you know by heart which MOSFET(S) and transistors are part of 18V rail?

 

[8BitSzop]

@silence012 In the message above, I made a small mistake because I was writing from memory — the internal power line is 22V, not 18V as in the T1600. Below is the part of the schematic responsible for generating the 22V voltage. There may still be some minor errors; if you find anything, please let me know so I can correct it. V+ (MAIN) is 12V.


Additionally, below is the part responsible for the VRAM voltage.

 

[8BitSzop]

@silence012 I have completed the schematic, although I don't yet know what all the signals mean. However, the rest should be correct. I am posting the schematic in a thread that seems more appropriate for powering up the T1200XE.
https://forum.vcfed.org/index.php?threads/toshiba-t1200xe-restoration-post.1242276/page-3

Regarding the transmission between the power supply and the motherboard, I was mistaken. There are signals called PSSD and PSRS that appear to be transmissions, but the power supply operates without them.