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Q&A Level shifting of a 3 state logic pin

I want to design a simple battery charger using MCP73831/2. This chip has a 3-State state pin according to the table below: I have a 3.3V MCU and I want to connect this pin to a GPIO. The MCU is...

2 answers  ·  posted 2y ago by dekker‭  ·  last activity 2mo ago by Nick Alexeev‭

#2: Post edited by user avatar Lorenzo Donati‭ · 2023-08-10T12:15:46Z (8 months ago)
Retagged.
#1: Initial revision by user avatar dekker‭ · 2022-04-09T11:13:14Z (almost 2 years ago)
Level shifting of a 3 state logic pin
I want to design a simple battery charger using [MCP73831/2][1]. This chip has a 3-State state pin according to the table below:

[![enter image description here][2]][2]

I have a 3.3V MCU and I want to connect this pin to a GPIO. The MCU is not 5V tolerant and maximum votlage on any pin is given 3.6V per datasheet (esp32).

My question is, how can I safely connect this STAT pin to my MCU? How can I translate its HIGH state (which is I guess 5V) to 3.3 and its LOW state to 0V (logic low). Is a resistor divider enough for this? or will I need to use mosfet or transistors? Here is my circuit:


[![enter image description here][3]][3]
[![enter image description here][4]][4]


  [1]: http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf
  [2]: https://i.stack.imgur.com/GiEHb.png
  [3]: https://i.stack.imgur.com/cGPAz.png
  [4]: https://i.stack.imgur.com/GdNjr.png