LCR Module - Onboard ic

Placement, modules, components and accessories; the ones that exist and the the nice-to-be's
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carlos.e.teixeira
Posts: 23
Joined: Mon Nov 28, 2016 1:00 pm

LCR Module - Onboard ic

Post by carlos.e.teixeira » Mon May 28, 2018 3:55 pm

Hi guys!

I would like to acquire the LCR Module directly from RedPitaya's website, but It's too expensive (~400€). Could anyone inform me some info about this module? Which is the onboard ic? I'm aiming to design my own LCR module.

Thanks in advance!
Best regards!

pavel
Posts: 516
Joined: Sat May 23, 2015 5:22 pm

Re: LCR Module - Onboard ic

Post by pavel » Mon May 28, 2018 4:26 pm

carlos.e.teixeira wrote:
Mon May 28, 2018 3:55 pm
Which is the onboard ic?
According to the source code, it's PCA9555 with the address set to 0x20.

The schematic is more or less clear from this picture.
Last edited by pavel on Fri Jun 01, 2018 10:08 am, edited 3 times in total.

pavel
Posts: 516
Joined: Sat May 23, 2015 5:22 pm

Re: LCR Module - Onboard ic

Post by pavel » Mon May 28, 2018 7:23 pm

Correction to my previous post. After carefully counting the pins on the picture, I'd say that it's MCP23017.

The addresses and the names of the registers in the source code correspond exactly to those of the MCP23017 that can be found on the pages 17-18 of its datasheet.
Last edited by pavel on Tue May 29, 2018 6:48 am, edited 1 time in total.

pavel
Posts: 516
Joined: Sat May 23, 2015 5:22 pm

Re: LCR Module - Onboard ic

Post by pavel » Mon May 28, 2018 7:57 pm

The values of the shunt resistors that are switched by the relays can also be found in the source code.

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