topic Output Current S32K144-EVB in S32K

Output Current S32K144-EVB

asrikrishnagovind — Mon, 04 Apr 2022 11:06:01 GMT

Hello, I have a Motor Drive application, which utilizes 4 Hall Effect Sensors (5v) to measure phase currents, and each of the sensor requires about 20mA of current typically to operate, along with an Encoder with similar requirements.

In the Datasheet of S32K1XX: S32K1XX: S32K1xx Data Sheet (nxp.com) Page 31, it was shown that the "Output high current total for all ports is 100mA". My query is, will the Evaluation Board S32K144-EVB be able to provide the current requirements of these sensors? Thanks and Regards

Re: Output Current S32K144-EVB

danielmartynek — Tue, 05 Apr 2022 10:49:41 GMT

Hello @asrikrishnagovind,

The MCU can provide combined 100mA at GPIOs (Output HIGH) as you mentioned.

But the MCU is powered by the SBC UJA1169

https://www.nxp.com/docs/en/data-sheet/UJA1169.pdf

Regards,

Daniel

Re: Output Current S32K144-EVB

asrikrishnagovind — Tue, 05 Apr 2022 11:13:00 GMT

Thanks for the reply. Will a given GPIO port be able to source the required 20mA? I understand that collectively all the ports can source 100mA. Is there an individual pin's maximum rating due to hardware or packaging constraint? Thanks and Regards

Re: Output Current S32K144-EVB

danielmartynek — Tue, 05 Apr 2022 13:25:47 GMT

Normal GPIOs can source 5mA at max voltage drop VDD - 0.8V at the output pin.

GPIO-HD pins (if DSE = 1) can source 20mA at max drop of 0.8V.

In other words, if the load is 20mA per pin / sensor, the sensor will not be powered by 5V but by >= 4.2V.

The sensors can be powered from the 5V generated by the SBC directly.

Regards,

Daniel