Opamp at low Power

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chmoc_1567941
Level 4
Level 4

hi,

   

i have been working on Temperature Transmitter. its need very low power . so i am using Psoc-4 which has low power mode.

   

its work fine with RTD ..its consume only 3.2mA for full operation.

   

Now i also want to sense thermocouple(J-K). For use thermocouple i need amplify the signal with two opamp configuration. because SAR adc cant directly read. so i put two opamp.so right now my power consumpation is 5.5 mA which is not good for Temperature Transmitter(4-20mA). i have to make it below 3.5mA. 

   

so how can i do it??

   

and 

   

is that opamp of psoc-4 consume 1mA for its operation??

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4 Replies
rola_264706
Level 8
Level 8
50 likes received 25 likes received 10 likes received

Please post your code.

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HeLi_263931
Level 8
Level 8
100 solutions authored 50 solutions authored 25 solutions authored

Looking at the PsoC4100 family data sheet, the OpAmp draw 1 up to 1.3mA in high-power mode, and 0.25-0.35mA in low power mode. But the core as such draws up to 4.2mA when running at 12MHz, and up to 7.2 at 24MHz.

   

You should go into sleep mode as much as possible (and then use some large bulk capacitance) to reduce the average current consumption.

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Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked

Hi Chirag,

Please check the low power modes and power reduction appnote : http://www.cypress.com/documentation/application-notes/an86233-psoc-4-low-power-modes-and-power-redu...

   

 

   

Best Regards,

   

VSRS

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Vasanth
Moderator
Moderator
Moderator
250 sign-ins 500 solutions authored First question asked

Hi Chirag,

Some additional info.

You can reduce the opamp power to low power will reduce power consumption.
You can also run ADC at low speed.
Periodic wakeup and sleep will help.

   

You can also change Debug select in cydwr to GPIO in order to reduce power.

   

 

   

Best Regards,

   

VSRS

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