david wrote:can any one help to confirm what's the chip number on the original HP45 pen drive (C8855m)? I got two possible versions: 1821-5613 and 1825-0057, also the 1826-4353 seems capable of same job.
Hacking the HP45
Re: Hacking the HP45
1826-4353 has only 80 pins . Original chip number is 1821-5613 an has 100 pins. I have a card from an old printer (hp 930c) with two chips (1826-4353 and 1826-4355) and I checked the 1826-4355, with 100 pins, against schematic diagram of C88555M, that seems to be exactly same of the 1821-5613
Re: Hacking the HP45
@math, thanks for your detailed reply. I'm current designing a driver board with L6452, although ST's support is crap. If I can work out how the Vboost is going to connect, I'll use this chip. The advantage is that it works under 24V or even 19V, which suites a small 3D printer better. Otherwise I'll have to consider an 8-digit chip.
The progress is so far so good. I attached a picture of the dry run timing to L6452. It's not tuned yet.
The progress is so far so good. I attached a picture of the dry run timing to L6452. It's not tuned yet.
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Re: Hacking the HP45
Also, check out this picturemath wrote:1826-4353 has only 80 pins . Original chip number is 1821-5613 an has 100 pins. I have a card from an old printer (hp 930c) with two chips (1826-4353 and 1826-4355) and I checked the 1826-4355, with 100 pins, against schematic diagram of C88555M, that seems to be exactly same of the 1821-5613
david wrote:can any one help to confirm what's the chip number on the original HP45 pen drive (C8855m)? I got two possible versions: 1821-5613 and 1825-0057, also the 1826-4353 seems capable of same job.
It is 1825-0057.
Re: Hacking the HP45
This is also an 100 pins chip. BTW, do you have the C8855M schematic diagram? I think that Vboost in L6452 is like fire voltage regulator in 1821-5613 (1826-4355, 1825--0057). I bet in this hipotese because are both from ST and directed to control related devices
david wrote: It is 1825-0057.
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dragonator
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Re: Hacking the HP45
Are the 8 digit chips available at all and are there any datasheets available? I have yet to find anything about the chips. It is of little use considering it as an option to use if they are not available anywhere.
Can't wait to see the results on the L6452. I am curious to see how it is going to work. I has the potential to remove a lot of components on my board. My board designs are nearing completion. I expect that I will order the current controller boards this weekend.
Can't wait to see the results on the L6452. I am curious to see how it is going to work. I has the potential to remove a lot of components on my board. My board designs are nearing completion. I expect that I will order the current controller boards this weekend.
Re: Hacking the HP45
My hipotese is that L6452 is an 8-digit chip. We only have to discover the related pins. So, schematic diagram of C8855M is a great point of start.
dragonator wrote:Are the 8 digit chips available at all and are there any datasheets available? I have yet to find anything about the chips. It is of little use considering it as an option to use if they are not available anywhere.
Can't wait to see the results on the L6452. I am curious to see how it is going to work. I has the potential to remove a lot of components on my board. My board designs are nearing completion. I expect that I will order the current controller boards this weekend.
Re: Hacking the HP45
Or maybe find a printer that uses L6452. I suppose ST made this chip available to everyone, you ca buy it from stores, so there must be an old printer using it! I would buy one if I could know! I see your point - printer makers may hide its code behind an 8 digit marking but since this chip is available for purchase it means someone is using it with this code - L6452.
Re: Hacking the HP45
The dry run test from the driver output also appeared to be ok. The rising and falling edge is within 0.1us and the voltage drop when I connect a 33ohm resistor is less than 0.5V @ about 10V output. After a few tuning I'll be able to connect a HP45 soon.
The 8d chip is available, especially if all the different numbers are virtually the same. The price is even cheaper than L6452. However, one thing put me back is the official board works at 30V, and I do not normally have that high voltage in my printer.
The 8d chip is available, especially if all the different numbers are virtually the same. The price is even cheaper than L6452. However, one thing put me back is the official board works at 30V, and I do not normally have that high voltage in my printer.
Re: Hacking the HP45
I guess probably only hobbyists like us are interested in L6452, a big manufacture can afford to order a version of 8d chip from ST. Also, later version of the printheads often have built-in driver.davidk wrote:Or maybe find a printer that uses L6452. I suppose ST made this chip available to everyone, you ca buy it from stores, so there must be an old printer using it! I would buy one if I could know! I see your point - printer makers may hide its code behind an 8 digit marking but since this chip is available for purchase it means someone is using it with this code - L6452.
Re: Hacking the HP45
I don't think so. Their answer regarding Vboost tells me they won't disclose infos to hobbysts. As if inkjet printing would be such a mass hobby 
.
Still, this chip can be found in online stores, which means someone in this world uses it in a mass produced device as is, not renamed.
However, there are two ways Vboost can be used: to create a voltage above the nozzle NMOS transistors for gate control (a low power supply in this case) or to create a controllable voltage for primitives array. In this case this supply must deliver a larger power and more external discrete components are required.
If Vboost is only for gate control, then it would be somewhat easy to discover on a test board.
But since ST issued an incomplete datasheet, can anyone guarantee there won't be other omissions or errors in the command set and/or initialisation of this chip?
.Still, this chip can be found in online stores, which means someone in this world uses it in a mass produced device as is, not renamed.
However, there are two ways Vboost can be used: to create a voltage above the nozzle NMOS transistors for gate control (a low power supply in this case) or to create a controllable voltage for primitives array. In this case this supply must deliver a larger power and more external discrete components are required.
If Vboost is only for gate control, then it would be somewhat easy to discover on a test board.
But since ST issued an incomplete datasheet, can anyone guarantee there won't be other omissions or errors in the command set and/or initialisation of this chip?