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BITMAIN APW9 power supply

Started by tolyan249, Mar 09, 2026, 02:33 PM

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tolyan249

Mar 09, 2026, 02:33 PM Last Edit: Mar 09, 2026, 02:36 PM by tolyan249
There is a BITMAIN APW9 power supply, and I don't know if anyone has worked with it. It regulates the voltage using i2c, and I can't even scan its address because the 9th SDA pulse is always 0. As a result, the ACK always comes. If I remove the connector from the power supply, the 9th SDA pulse becomes a perfect 1.

Stephen Moss

#1
Mar 10, 2026, 08:47 AM Last Edit: Today at 08:21 AM by Stephen Moss Reason: I think I had the High and Low references the wrong way round
It may help people to resolve your problem if you could supply a link to/data for the I2C protocol, and the code you are using. Without that it would be difficult to see what you may be doing wrong.
After a quick search the only reference I could find was...
QuoteThe 4-PIN signal connector is the interface between the external control board and the power supply. The SDA/SCL is an I2C bus. The output voltage of the power supply can be adjusted through I2C. EN is the ENABLE signal of the power supply. The control board can enable the power supply through EN, active high.
From that, my guess would be that perhaps you have to set the EN pin Low to disable the PSU (no output/enable comms?) while you are communicating with it and then set it High to accept and either output the new voltage following correct communications, or the previous voltage if the instructions received were rejected.
But with so little information to go in I may be wrong.

tolyan249

#2
Today at 11:18 AM Last Edit: Today at 11:23 AM by tolyan249
Yes, that's right, this power supply is running, but I don't know how to access it. I've read a lot about it, but I can't find complete information about its address and monitoring and control registers. It's not about the code; the code works on any i2c device, but it doesn't want to work on the APW9. Therefore, I'm asking if anyone has worked with this power supply.
It can receive data even when it's not turned on, as it has an additional 12V power supply. The pic16F1704 controller acts as a slave, managing and providing monitoring data.

 Thank you for your assistance.

RGV250

#3
Today at 01:16 PM
Have you tried asking the company?
There is a contact us at the bottom of this page. https://support.bitmain.com/hc/en-us/articles/900000069726-APW9-14-5V-21V-Specifications

Regards,
Bob
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