Problems driving a Infineon BTS7080 high side driver with an I2C PCF8575 IO expander

Projects General Guidance
1

Hi all

Im trying to drive a infineon high side driver (BTS7080) with an I2C IO expander (PCF8575).
I can get the PCF8575 to go low but cant not get the chip to trigger the high side driver.
The high side driver triggers when recieving a high (5V) signal.
Im using a STM32 Nucleo32 (F303K8) microcontroller and i'm coding it in ARDUINO IDE.
I hope some of you can help me get it to work since i'm nearing a deadline.
Thanks in advance

2

So ... No time to read the forum guide then?

Based on the information given so far, the most I can say is: it should be possible to make it work.

3

Can you make the driver work when connected directly to I/O pin(s)?

4

It works when i supply 5V to the trigger pin directly. When i trigger it with the PCF8575 i only gets maybe 0.16 V out which is very wierd. I have tried with 2 chips and one bought module containing the chip

5

The outputs are active LOW only and need a pullup resistor for logic HIGH level.

6

Thanks man! That was a fix.

7

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