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iMX7S low power management

Question asked by Kunjal Garach on Nov 25, 2016
Latest reply on Nov 15, 2017 by harish Ganesan

We are using iMX7S processor in wearable medical device development were power consumption is primary factor.

 

Our use case is M4 is always in RUN mode and A7 in STOP mode. Whenever I need to do some processing on A7, M4 sends weak-up request to A7, A7 do some processing and go in to STOP mode again.

To check iMX7S power consumption I am measuring current on VDD_ARM and VDD_SOC power rail.

 

A7 Mode

M4 Mode

Current mA VDD_SOC

Current mA VDD_ARM

RUN

RUN

174.8

8.4

MEM

RUN

175.9

3.3

 

As you see from this table. If I put A7 in STOP mode, VDD_SOC current is almost same while VDD_ARM current is decrease.

So the power consumption of iMX7S in A7 in STOP mode and M4 in RUN mode is around 180mW. 

 

So how to reduce power consumption when A7 is in STOP mode and M4 is in RUN mode?

 

Kunjal

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