STM CircleOS forum / Question

Craig · 2009-06-15 15:45:26

Hello,

I was wondering what voltage level the I2C1 bus operates at in the STM32 Primer 2?

The reasoning is to determine wether or not an I2C voltage level conversion circuit is needed to connect to other hardware via the expansion header.

Thanks for any help

Francis · 2009-06-15 16:07:59

For the STM32 -and its IOs-, Vcc=2.85V.
The same voltage is supplied to the extension board.
Note that most of the STM32 pins (including I2C1 pins) are 5V tolerant (and can be configured in open-drain mode).

# 1 2009-06-15 15:45:26 Question - I2C1 Voltage Level

Question - I2C1 Voltage Level

# 2 2009-06-15 16:07:59 Question - I2C1 Voltage Level

Re: Question - I2C1 Voltage Level

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