ADC inputs on STM3241G-EVAL Board

[Rogers.Gary]

Posted on March 24, 2014 at 15:52

Hi...

I have what appears to be a simple, yet confusing issue. I have the above mentioned eval PCB. I need access to any ADC input, but they all appear to be taken. On the eval board are 4 connectors for ''daughterboards''. These connectors are marked  CN1 through CN4. For example, I'd like access to PC1, which is pin 31 on CN1. According to the table on pg.23 of UM1460, if I open SB11, it becomes MII_MDC. However...it shows connect point MII_MDC also connected on pg.48 to an ethernet chip. Why have access to a pin when it's already connected? How can I get access to an ADC pin on this eval board? Thank you... #adc-input #stm3241g-eval-kit

[Tesla DeLorean]

Posted on March 24, 2014 at 23:16

PC3 would be easier to free as there are two resistor paths that could be broken.

PF9 might also be relatively easy to liberate. The F4 has more ADC pins, it would take some work to enumerate them against the board, which does look to be a poor choice for evaluating analogue input options.

[Rogers.Gary]

Posted on March 24, 2014 at 23:47

Figured it out.

Used PC1, SB11 is off by default, disabled PB14 (ethernet clock power)