Does PY32Fxx series support True Open Drain?

[llinjupt]

Hi IOsetting.

I wonder if PY32Fxx series support True Open Drain when with 3V3 supply like STM8S does. I have read the datasheet and nothing about 5VFT. It seems that you are so familiar with this series. Would you like to confirm if it's supported. Thanks in advance.

[IOsetting]

Hi llinjupt,

I got no technical support from Puya so I cannot give a definite answer. According to the voltage limits described in 表 5-1 电压特性 in the datasheet, if the numbers are true, these pins are not true open drain, and they are not 5V tolerant when the power supply is 3.3V.

[llinjupt]

@IOsetting Thanks. Arrording to the table, the maximum input voltage is VCC+0.3, so no pin is 5V tolerant
when with 3V3 supply.