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LCR Module - Onboard ic

Posted: Mon May 28, 2018 3:55 pm
by carlos.e.teixeira
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!

Re: LCR Module - Onboard ic

Posted: Mon May 28, 2018 4:26 pm
by pavel
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.

Re: LCR Module - Onboard ic

Posted: Mon May 28, 2018 7:23 pm
by pavel
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.

Re: LCR Module - Onboard ic

Posted: Mon May 28, 2018 7:57 pm
by pavel
The values of the shunt resistors that are switched by the relays can also be found in the source code.