topic Re: MKL03Z: Current consumption too high in VLLSx states in Kinetis Microcontrollers

MKL03Z: Current consumption too high in VLLSx states

gauravbanyal — Fri, 16 Jun 2017 13:37:14 GMT

Hello,

I am employing VLLS3 and VLL0 in my system design for MCU sleeping with RAM available and without RAM respectively. I have the VCC line to the uC and routed it through a micro-ammeter. Following are the readings I get and I am afraid they are much higher than what is specified in the datasheet. My supply voltage is 2.7v and in VLLS3 state the LPTMR is running based on the LPO clock.

VLLS3 = 4.7uA
VLLS0 = 3.8uA

Please help me in reducing the current consumption. I will be willing to share the schematics in a personal message with NXP.

Thanks in advance,

Gaurav Banyal.

Re: MKL03Z: Current consumption too high in VLLSx states

Robin_Shen — Mon, 19 Jun 2017 01:39:43 GMT

Hi Gaurav Banyal,

You can refer the power_manager demo in SDK_2.2_FRDM-KL03Z. The current in VLLS3 is about 1uA.

Have you check the hardware of your custom board to avoid extra current leakage? You can refer the tips in Optimizing IO Power Consumption.

If the current of your custom board is still so high. Please send the schematic and project to me.

Best Regards,

Robin

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Re: MKL03Z: Current consumption too high in VLLSx states

gauravbanyal — Tue, 20 Jun 2017 14:48:06 GMT

Hello Robin,

Thanks for your inputs and support.

I have been able to solve this issue. After I set-up the pin mux to use pin PTB5 as kPORT_PinDisabledOrAnalog, the current consumption reached to values from the MKL03 specification.

I remember that I had tried this code change before but it never worked before. You know, Firmware can be quite strange at times.

Best regards,

Gaurav.