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DRV8850: Minimum current sense of Vpropi

Part Number: DRV8850


I'm using a DRV8850 to drive a very small DC motor on 3.7V battery,

The Vpropi pin is connected to a 4.3kOhm resistor and voltage is measured by the MCU's ADC.

On empty load the motor use about 15mA.

Some boards are able to measure this small current and small load variations,

but other boards only read zero voltage from Vpropi.

All boards works when I connect a bigger DC motor at the output of the DRV8850,

Does the DRV8850's Vpropi work only with a minimum current?

Thanks in advance for your help.