darnelld
Posts: 1
Joined: Fri Oct 29, 2021 8:03 pm

CM4 BGA IC identification

Fri Oct 29, 2021 8:12 pm

Hello All,

I am trying to identify the IC on the bottom side of the CM4 shown in the image attached that is connected to the two ferrites.

Any help is much appreciated!

Cheers
CM4.jpeg
CM4.jpeg (102.72 KiB) Viewed 894 times

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MikeDB
Posts: 1281
Joined: Sun Oct 12, 2014 8:27 am

Re: CM4 BGA IC identification

Sat Oct 30, 2021 1:06 am

Possibly the power switching and regulator chip, equivalent of U2 on the Pi4 but with less voltages needed.
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trejan
Posts: 4920
Joined: Tue Jul 02, 2019 2:28 pm

Re: CM4 BGA IC identification

Sat Oct 30, 2021 1:20 am

darnelld wrote:
Fri Oct 29, 2021 8:12 pm
I am trying to identify the IC on the bottom side of the CM4 shown in the image attached that is connected to the two ferrites.
Dialog Semiconductor DA9090.
MikeDB wrote:
Sat Oct 30, 2021 1:06 am
Possibly the power switching and regulator chip, equivalent of U2 on the Pi4 but with less voltages needed.
The main MxL7704 PMIC is on the top.

f0rd0prefect
Posts: 31
Joined: Fri May 17, 2013 11:58 am

Re: CM4 BGA IC identification

Wed Mar 02, 2022 4:29 pm

trejan wrote:
Sat Oct 30, 2021 1:20 am
darnelld wrote:
Fri Oct 29, 2021 8:12 pm
I am trying to identify the IC on the bottom side of the CM4 shown in the image attached that is connected to the two ferrites.
Dialog Semiconductor DA9090.
MikeDB wrote:
Sat Oct 30, 2021 1:06 am
Possibly the power switching and regulator chip, equivalent of U2 on the Pi4 but with less voltages needed.
The main MxL7704 PMIC is on the top.
According to the PCN (Product Change Note) of the RPi4 Rev1.5 (Raspberry Pi 4 Revision 9 PCB) there is also a DA9090 on the RPi4-Board since Oct21. It has replaced the MxL7704-R4 PMIC
Image

g**gle did not find any information about this PMIC. Seems pin-compatible to the MxL7704-R4?
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Rev1_5.jpg
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jamesh
Raspberry Pi Engineer & Forum Moderator
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Re: CM4 BGA IC identification

Wed Mar 02, 2022 4:39 pm

What do you need to know about it?
Principal Software Engineer at Raspberry Pi Ltd.
Working in the Applications Team.

timg236
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Re: CM4 BGA IC identification

Wed Mar 02, 2022 4:56 pm

f0rd0prefect wrote:
Wed Mar 02, 2022 4:29 pm
g**gle did not find any information about this PMIC. Seems pin-compatible to the MxL7704-R4?
It's not compatible and requires different firmware. The firmware is in Buster (legacy) and Bullseye supports this. IIRC firmware support was added over six months ago.

Ventran
Posts: 86
Joined: Wed Dec 16, 2020 5:22 pm

Re: CM4 BGA IC identification

Fri Mar 04, 2022 11:26 am

f0rd0prefect wrote:
Wed Mar 02, 2022 4:29 pm
g**gle did not find any information about this PMIC. Seems pin-compatible to the MxL7704-R4?
The MxL7704-R4 PMIC is not compatiblem with MxL7704-P4 on RPi CM4. This is a special version of PMCI designed for Raspberry Pi Fundation. This IC require pre-programing internal registers via I2C. Cloning P4 (i2c dump) and write to R4, give you absolutely nothing. CM4 requires an appropriate sequence of voltage enabling (core power supply, memory, etc.). This is ensured by a custom PMIC.
Last edited by Ventran on Wed Jul 06, 2022 6:03 am, edited 3 times in total.
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jamesh
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Joined: Sat Jul 30, 2011 7:41 pm

Re: CM4 BGA IC identification

Fri Mar 04, 2022 11:45 am

sed /fundation/Ltd/
Principal Software Engineer at Raspberry Pi Ltd.
Working in the Applications Team.

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