MSP430G2221: MSP430G2221

Bill Kury

Part Number: MSP430G2221

Tool/software:

I have a new design requirement that requires a SPI to MDIO converter. Do you have any design examples using the MSP430 processors that implements something like this. The voltage requirements are 1.8 to 3.6 volts and MDIO speed must be 2.5 MHz max.

Bill

6 months ago

0 Diego Abad Sajamin 6 months ago

TI__Genius 16642 points

Hi Bill,
We don't have any examples of an SPI to MDIO bridge. The specs seem to be within the ranges that this MSP430 device has, so it could, in theory, work (through an SPI module or GPIO bit-banging). However, since it is not a hardware module already in the M0, there could be issues like timing delays. My advice is that if that's an acceptable risk, I would look online for tutorials on emulating MDIO through GPIO or SPI.

Best Regards,

Diego Abad

0 Bill Kury 6 months ago in reply to Diego Abad Sajamin

Prodigy 220 points

You have this USB 2 MDIO board that I have seen on the internet. It uses the MSP430g2x53 device. I was wondering if you could send me the schematics for that board and I could take a look at using it.

Bill

0 Diego Abad Sajamin 6 months ago in reply to Bill Kury

TI__Genius 16642 points

Hi Bill,
You are correct. I saw that reference design, but missed the MSP430 part from it. The schematics for the MSP-EXP430G2 LaunchPad can be found in its 6.2 Schematics Userguide's section.

Best Regards,

Diego Abad

0 Bruce McKenney 6 months ago in reply to Bill Kury

Guru 100405 points

From what I can tell:

1) The hardware is just a Launchpad -- either G2553 or F5529.

2) The downloadable package doesn't include source code. Apparently the source is not available.

3) The "USB" is really just a UART running through the Launchpad backchannel UART.

4) This thread describes the (UART) protocol [I expect you know better than I what it means]:

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/653516/usb-2-mdio-re-usb-2-mdio-source-of-usb-2-mdio-would-be-very-helpful

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MSP430G2221: MSP430G2221