topic Power consumption KL25 in VLPS mode in Kinetis Microcontrollers

Power consumption KL25 in VLPS mode

ericbusi — Fri, 08 Nov 2013 09:27:11 GMT

Hi all,

I have a problem of power cunsumption in VLPS mode. In the KL25 datasheet there is 16μA max for this mode and i have approximately 200μA.

The LPTimer module is enabled on the internal clock to 1kHz and this is LPTimer_ISR at 1sec that wakeup the micro.
Before going VLPS, oscillator is in FEE mode.
In STOP mode, is that the type of operation of the oscillator operates in the power consumption? I can not found in the doc, there is a note for WAIT mode, but nothing to the STOP mode.

Regards,

Eric

Re: Power consumption KL25 in VLPS mode

perlam_i_au — Tue, 18 Feb 2014 21:40:14 GMT

Regard the current consumption I would like to know if actually your device is working at 25C, because in the same spec is mentioned that current consumtion in VLPS mode at 105C will be 201μA.

About consumption in stop mode you will find in the same table that there is a IDD_STOP information, this consumption is generated because in stop mode the core does not execute anything but many other modules remain powered and working as well as memory.

Cheers,
Perla

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Re: Power consumption KL25 in VLPS mode

ericbusi — Fri, 07 Mar 2014 08:18:03 GMT

I had this line to stop the adc in stop mode:

SIM_SCGC6 &= ~SIM_SCGC6_ADC0_MASK; // disable ADC

but this is not sufficient, I added the following line to stop the adc

ADC0_CFG2 &= ~(ADC_CFG2_ADHSC_MASK | ADC_CFG2_ADACKEN_MASK);

I have now a correct current comsumption of 4µA in VLPS mode.