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Author Topic: STM32F 5V to open drain pin  (Read 1604 times)

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Offline Vindhyachal.taknikiTopic starter

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STM32F 5V to open drain pin
« on: April 23, 2015, 12:59:22 pm »
1. I am using stm32f205.
2. MCU is powered by 3.3V.
3. Another ic pin is driven by 5V logic or (Vih = 0.7*VDD = 3.5V)
4. Can I set pin of STM32F2 as open drain & connect 5V by pull up to it.
5. Datasheet of MCU says that they are not true open drain pins.
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Offline mrflibble

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Re: STM32F 5V to open drain pin
« Reply #1 on: April 23, 2015, 01:11:30 pm »
The pins marked as 5 Volt tolerant (FT) should be able to act as an open drain connected to a 5 Volt rail. As long as you use an external pullup (as opposed to the internal weak pullup), and keep the current limited you should be fine.
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