CC2745R10-Q1: Sudden Increase in Sleep Current on Custom Board Using CC2745R10

Ratan Dalei

Part Number: CC2745R10-Q1

Tool/software:

Dear TI Support Team,

We are using the CC2745R10 in our custom hardware design. The application runs as expected on the TI development board. However, after migrating to our custom board, we initially observed higher-than-expected current consumption.

Upon investigation, we realized that our board does not include an external 32.768 kHz crystal oscillator, although the firmware was configured to use the LF XOSC. After updating the configuration to use the internal LF RCOSC instead, the current draw significantly improved, and the system successfully entered low-power mode.

However, we are now encountering a new issue: after approximately one minute of operation, the sleep current suddenly increases significantly. We have not been able to identify the root cause of this behavior.

This issue was previously suggested by you, and here I would like to add some additional context:

The device is configured to advertise every 100 mS.
We are using simplelink_lowpower_f3_sdk_9_10_00_22_eng.
Our development environment is Code Composer Studio 12.8.1.

We have attached the power analyzer waveform for your reference.

Could you please help us understand what might be causing this sudden rise in sleep current ?

above image you can see after some time how it has increased

you can see initially sleep current of our device was 146.339uA.

After 1 minute sleep current has been increased to 3.18mA.

Thanks & Regards

Ratan Dalei

3 months ago

0 Nima 3 months ago

TI__Genius 14705 points

Hello,

Thanks for reaching out, we will reply to you by Wednesday of next week.

Best,

Nima Behmanesh

0 Andrew Lugo 3 months ago in reply to Nima

TI__Intellectual 2460 points

Ratan,

Can you provide the schematic of your custom design to review? Thanks.

Andrew

0 Ratan Dalei 3 months ago in reply to Andrew Lugo

Prodigy 145 points

Hi Andrew,

We cannot share the schematic openly. Please ensure it is kept private within this conversation. Alternatively, if you could share your personal email, I can send it directly to you.

Thanks & Regards

Ratan Dalei

0 Andrew Lugo 3 months ago in reply to Ratan Dalei

TI__Intellectual 2460 points

Ratan,

I've sent you a friendship request. Please accept and then we can discuss how you can send me the schematic privately.

Regards,

Andrew

0 Ratan Dalei 2 months ago in reply to Andrew Lugo

Prodigy 145 points

Hi Andrew,

We observed an issue related to sleep current behavior. When we removed the load connected to the DIO24_X32N and DIO23_X32P pins—originally used for a low-pass crystal the sleep current became stable and consistent. These two pins were being used as outputs to drive an external load.

However, we would like to confirm the root cause of this behavior. Our intention is to use the internal RC oscillator, and we are not planning to use an external crystal oscillator.

Could you please help us understand why the sleep current is affected in this case?

Thanks and regards,
Ratan

0 Andrew Lugo 2 months ago in reply to Ratan Dalei

TI__Intellectual 2460 points

Ratan,

I know you mentioned that you were using the basic_ble project. Did you modify the .syscfg file to use the internal RC oscillator instead of the external LFXOSC?

0 Ratan Dalei 2 months ago in reply to Andrew Lugo

Prodigy 145 points

Andrew,

Yes, Already i have modified the .syscfg file and changed the LFOSC source from the external LFXOSC to the internal RCOSC.

0 Ratan Dalei 2 months ago in reply to Ratan Dalei

Prodigy 145 points

Hi Andrew,

Could you please let us know if there is any update regarding this? We need to modify our existing device based on it.

Thanks & Regards.

Ratan.

0 Andrew Lugo 1 month ago in reply to Ratan Dalei

TI__Intellectual 2460 points

Ratan,

Sorry for the delayed response. If you're using the internal 32kHz oscillator, and removing the load on the DIO24_X32N and DIO23_X32P pins resolves your issue, you must have those pins set high or tied to a pullup internally that is causing the increased current consumption. If you don't want the loads tied to those pins to draw current, then ensure those DIO's are set to high z or internally pulled down. This should prevent the load tied to those pins from drawing current.

Regards,

Andrew

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CC2745R10-Q1: Sudden Increase in Sleep Current on Custom Board Using CC2745R10