How to use the VRC_CTRL pin of S32K344

[shunyizhang]

How to use the VRC_CTRL pin of S32K344, PTE13 is the default VRC_CTRL function, the schematic diagram is my self-developed board, VRC_CTRL as a 1.5V drive voltage. Now I do not have any operation on PTE13, and there is no voltage in R59 in the figure. May I ask what is the reason?

[VaneB]

Hi @shunyizhang 

To ensure that the root cause is not related to the hardware, please follow the recommendations we provide in the Hardware Design Guidelines for S32K3 Microcontrollers for the pin for the external NPN Ballast transistor for V15.

B.R.

VaneB

[shunyizhang]

Does the software need to be configured?

[VaneB · Accepted solution]

Hi @shunyizhang 

Last Mile regulator base control (VRC_CTRL) is not enabled by default. You need to set PCM_CONFIG[LMBCTLEN]. For more information, please refer to section 43.7.3 (PMC Configuration Register (CONFIG)).