CC2640R2F: power consumption of watchdog timer

lakshmikanth satyavolu

Expert 1680 points

Part Number: CC2640R2F

Tool/software:

Hi community,

Recently I have enabled Watchdog reset inside my code to get the process out from unexpected hangs.

But I am observing enabling wdt and clearing it periodically consumes more power. Is this expected?

I did not create new timer for clearing wdt. I am using existing application loop for that purpose.

Power consumption is significant. How to avoid this?

Thanks in advance.

BR,

Lakshmi

10 months ago

0 Toby 10 months ago

TI__Mastermind 34960 points

Hi Lakshmi,

Yes, it's expected that periodic wakeups will increase power consumption, but in this case it should not be an increase to cause concern on power consumption.

What is the difference in current consumption between with WDT use and without WDT use?

Thanks,
Toby

0 lakshmikanth satyavolu 10 months ago in reply to Toby

Expert 1680 points

It is almost 2x Toby,

Without wdt enabled our battery lasts 3 days approx. With wdt enabled, it drains in 1.5 days.

Best

Lakshmi

0 Toby 10 months ago in reply to lakshmikanth satyavolu

TI__Mastermind 34960 points

Can you share code snippets of the Watchdog setup, and also the Watchdog clear?

What hardware are you using for CC2640R2F? Launchpad or custom board?

How often is the application loop running?

Can you try running the SDK example for Watchdog and compare current consumption? Example here: https://dev.ti.com/tirex/explore/node?node=A__ALmkohAFy-UxvQQU0hbheA__com.ti.SIMPLELINK_CC2640R2_SDK__krol.2c__LATEST

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CC2640R2F: power consumption of watchdog timer