ericxu
Posts: 3
Joined: Mon Jan 13, 2020 12:05 pm

some questions about schematics for the Compute Module IO board (CMIO)

Mon Jan 13, 2020 12:25 pm

Hello everyone,

This is our first time to use the CM to develop our own product. Here are some questions met when we check the schematics of CMIO module:

1. What's the meaning of PP1, PP2,...PP19?
2. C21&C22, it marks as NF, do you have the exact electric capacity?
3. R15&R24&R25, it marks as NF, do you have the exact resistance value?

Please kindly help me to check.

And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?

Thank you in advance for all your support.

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2869
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: some questions about schematics for the Compute Module IO board (CMIO)

Mon Jan 13, 2020 1:03 pm

PP means Probe Point - it's a place to measure the signal with a scope or logic analyser.
NF means Not Fitted - there is no component fitted there.

User avatar
Frederir
Posts: 12
Joined: Tue May 24, 2016 12:28 pm
Contact: Website

Re: some questions about schematics for the Compute Module IO board (CMIO)

Mon Jan 13, 2020 4:36 pm

And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?
The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of CM3 using it, google is your friend.

Good luck with your design.
Custom board design based on RPI or other : http://www.aptustech.com/

ericxu
Posts: 3
Joined: Mon Jan 13, 2020 12:05 pm

Re: some questions about schematics for the Compute Module IO board (CMIO)

Tue Jan 14, 2020 8:10 am

PhilE wrote:
Mon Jan 13, 2020 1:03 pm
PP means Probe Point - it's a place to measure the signal with a scope or logic analyser.
NF means Not Fitted - there is no component fitted there.
Thank you very much for your help.

ericxu
Posts: 3
Joined: Mon Jan 13, 2020 12:05 pm

Re: some questions about schematics for the Compute Module IO board (CMIO)

Tue Jan 14, 2020 8:11 am

Frederir wrote:
Mon Jan 13, 2020 4:36 pm
And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference?
The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of CM3 using it, google is your friend.

Good luck with your design.
Thank you very much for your help.

fuwen0202
Posts: 13
Joined: Sat Mar 07, 2020 12:51 pm

Re: some questions about schematics for the Compute Module IO board (CMIO)

Mon Mar 09, 2020 3:31 pm

i just layout LAN9500A usb2lan IC, without test。。。。if u need,say a words

Return to “Compute Module”