S32K148 pin configuration in sleep mode

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S32K148 pin configuration in sleep mode

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Contributor IV

Hello,

I am using S32K148 in my project.

I could successfully put the processor in VLPS mode of operation.

I also configured all unused pins to 'PORT_PIN_DISABLED' state in software.

Observation is that the processor is still consuming lot of power (7mA).

May I know what precautions to be taken to get to ~50uAmps as mentioned in Datasheet?

Thanks

Hari

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4 Replies

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NXP TechSupport
NXP TechSupport

Hello Hari,

The specification was taken with the internal pull downs enabled on all unused input pins and without any load on output pins. Table 7, footnote 1, DS rev9:

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Do you run the application stand-alone without any debugger connected?

Thanks,

Daniel

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Contributor IV

Hello Daniel,

Yes, I disconnected Debugger to measure the current consumed by the processor (which is 7mA). With debugger connected, it is consuming 10mA.

We do have external pull-downs (10K) connected for all unused pins.

Thanks,

Hari

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NXP TechSupport
NXP TechSupport

Hello Hari,
Are you sure it is not driving any external load?
What are the peripherals that are enabled in VLPS in your application?
Please see S32K1xx_Power_Modes_Configuration.xlsx that is attached to the DS – it specifies the MCU configuration for all the measurements in Table 7.
Also, have a look at Table 8, if you are using SPI master + DMA in VLPS, the consumption can be 7mA.

Thanks,
BR, Daniel

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Contributor IV

Yes Daniel, you are correct.

Issue was with external oscillator.

After disconnecting the oscillator from MCU power supply, it only draws around 54uA.

Thanks,

Hari