cancel
Showing results for 
Search instead for 
Did you mean: 

PSoC 4

DaHu_285096
Contributor II

 I have a low powered application using PSOC4200 powered by 3V battery.

   

The application has the micro and 2 other ICs on the PCB.

   

The other 2 ICs combined draw 12uA. Currently I put the micro into deep sleep and all I need is to wake on an interrupt on a Pin state change. 

   

I have measured total current around 60uA, this implies the 4200 is drawing 48uA instead of the 1.3-15uA suggested in the low power guide.

   

I do have the LVP enabled as I want to know if battery gets low. IIf this is drawing current then I could stop the LVP int before deep sleep and start again on wake.

   

I have SPI being used when wake and also a timer interrupt that is stopped before putting to deep sleep.

   

My target is 30uA total for the circuit (around 15-20uA for 4200 would do the trick).

   

Thanks

0 Likes
1 Reply
ETRO_SSN583
Esteemed Contributor

Did you try running one of the example projects to see if you could

   

eliminate the PSOC.

   

 

   

I am sure you have seen these -

   

 

   

    

   

          

   

http://www.cypress.com/?rID=105694     CE95288 - CapSense Low Power with PSoC 4

   

http://www.cypress.com/?rID=78797     AN86233 - PSoC® 4 Low-Power Modes and Power Reduction Techniques

   

 

   

Discretes like bulk caps not leaky ? No floating pins configed as inputs ? No loads being driven ?

   

No pins taken outside rails causing input protection diode current ? No regulator drawing reverse

   

current in its output ?

   

 

   

 

   

Regards, Dana.

0 Likes