CC1352R: how to calculate Battery lifetime of cc1352R

surya

Part Number: CC1352R
Other Parts Discussed in Thread: MSP430FR2433

Dear Experts,

Currently, i am trying to make an smart flow meter(mechanical-pulse) device, so that i used MSP430fr2433 for pulse capturing and store the pulse count then cc1352r collect the stored data(pulse count) through UART (DIO25-TX, DIO-26-RX), then transmit through sub-1-GHZ at 2.5kbps settings for an long range.

i have used 19000maH battery for my device, my device consumption is 200-300uA at sleep(30min), during transmission greater than 20 to 40mA -<2sec.

Here my doubt is my battery getting drain at just less than 100days with above power consumption, i can't figure out the reason. so please guide me to find the solution.

i wrote the code based on rf packet tx example and uart call back using semaphore. i have attached previous discussion for your reference. it has my code for your review.

i used ER34615, 19000mah battery, i have attached my battery datasheet below.

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1215215/cc1352r-how-to-achieve-low-power-consumption-with-uart-and-rf-cc1352r/4619140?tisearch=e2e-sitesearch&keymatch=cc1352R#4619140

Ramway-Primary-Lithium-Battery-handbook(1)(1) (1).pdf

regards

Surya

over 2 years ago

0 Marie H over 2 years ago

TI__Guru* 82521 points

Hi Surya,

200-300uA at sleep sounds excessive. According to the datasheet, standby current with cache retention should be below 3 uA. (https://www.ti.com/lit/ds/symlink/cc1352r.pdf )

Have you seen our app note on measuring power consumption? It also contains some pointers on how to achieve lowest possible power: https://www.ti.com/lit/swra478

Cheers,

Marie H

0 surya over 2 years ago in reply to Marie H

Expert 2395 points

Hi Marie H

Yes you are correct, if i test rf packet example code standalone it consumes <5uA only, also MSP430fr2433 consumes 1uA only,

but if i connect both devices through UART it consumes 200uA,

if you need my code and design file please let me know i will share with you on privately,

please guide me to find the mistake what i made in the design or code...

regards

Surya

0 Marie H over 2 years ago in reply to surya

TI__Guru* 82521 points

Hi Suraya,

Are you using UART in callback mode or blocking mode?

According to the datasheet chapter 8.5, UART consumes +140.8 uA. So I suspect this is the reason why you're seeing an increased power consumption. If you switch to callback mode and implement a wake-up pin you can turn the UART off between transactions.

Cheers,

Marie

0 surya over 2 years ago in reply to Marie H

Expert 2395 points

Hi Marie H

Thanks for the reply, Yes i have use callback method and i have shared my previous forum for your ref, i have shared my code in that forum so please check and point out what mistakes i made...

regards

Surya

0 Marie H over 2 years ago in reply to surya

TI__Guru* 82521 points

Hi Surya,

We don't have capacity to go through the code.

To debug this further: How about using a GPIO to toggle when you expect the device to go to sleep. Then you can use a logic analyzer in combination with your power measurement to see if your application is behaving the way you expect.

Cheers,

Marie H

0 surya over 2 years ago in reply to Marie H

Expert 2395 points

Hi Marie H

Thanks for the reply,

Sorry i can't understand your guidance steps,

Please let me know which GPIO need to be toggle CC1352 or MSP430,

I don't have an power analyzer so that i use Fluke 17B+ digital multimeter to measure my device power...

regards

Surya.

0 Marie H over 2 years ago in reply to surya

TI__Guru* 82521 points

Hi Surya,

Did you try running the uart callback example and measure the power consumption? This could give you an indication of expected power consumption when using uart in callback mode.

https://dev.ti.com/tirex/explore/node?node=A__AHOFVyHPugCjSsA3IBN1VA__com.ti.SIMPLELINK_CC13XX_CC26XX_SDK__BSEc4rl__LATEST&placeholder=true

If you have a LaunchPad, you can use Energy Trace on the LaunchPad debugger to get a more accurate power measurement:

https://dev.ti.com/tirex/explore/content/simplelink_cc13xx_cc26xx_sdk_7_10_01_24/docs/proprietary-rf/proprietary-rf-users-guide/energy-trace/energy-trace.html

Cheers,

Marie H

Sub-1 GHz

Sub-1 GHz forum

CC1352R: how to calculate Battery lifetime of cc1352R