NUCLEO-WBA52CG: Higher then expected current in HeartRate example.

[Jtron.11]

Split from Why there is no NUCLEO-WBA52CG projects in STM32CubeWBA?

This is a new topic, by a new author.

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Dear @STTwo-32 

I am struggling with STM32WBA52KG chipset, can you please give me some pointers?

Everything is starting with our hardware team select STM32WBA52KG MCU because of the size and power consumption from documentations, and I am tasked with create a version of ble + standby power profile.

I am using Nucleo-STM32WBA52CG, cubeMX6.9.0, cubeIDE1.12.0.

When I tried the example HeartRate with sequencer setting CFG_LPM_STDBY_SUPPORTED (1)

/******************************************************************************
 * Low Power
 *
 *  When CFG_FULL_LOW_POWER is set to 1, the system is configured in full
 *  low power mode. It means that all what can have an impact on the consumptions
 *  are powered down.(For instance LED, Access to Debugger, Etc.)
 *
 *  When CFG_FULL_LOW_POWER is set to 0, the low power mode is not activated
 *
 ******************************************************************************/
#define CFG_FULL_LOW_POWER       (1)

#define CFG_LPM_SUPPORTED        (1)
#define CFG_LPM_STDBY_SUPPORTED  (1)

My nucleo board still consumed about 15uA.  I still see the board is advertised so I don't think I am in standby mode yet.

Can you please help to give me some pointers how can I enter the standby mode and wake up from it?

Thank you for your helps

[Issamos]

I think this is a different topic. So, it will be better to create a new post with more details. 

Best Regards.

II

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Now split to a separate thread.

[Andrew Neil]

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@Jtron.11 wrote:

I am using Nucleo-STM32WBA52CG

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You originally posted in this thread - which was solved by noting that the NUCLEO-WBA52CG is NRND.

So why are you starting a new design on this board?

Anyhow, for any board, it is important to be sure that the current you're measuring is just the actualy MCU's consumption - not consumption and/or leakage due to other things on the board.

Check the schematics very carefully for possible sources of leakage.

In particular, on a Nucleo board, you have to take great care to ensure that the ST-Link is fully disconnected...

eg, see: Excess Current Consumption Running B-L072Z-LRWAN1 From Battery??

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@Jtron.11 wrote:

My nucleo board still consumed about 15uA. 

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How, exactly, did you measure this?

A meter is not going to be useful here:

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@Jtron.11 wrote:

I still see the board is advertised so I don't think I am in standby mode yet.

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Typically, these things work by going into the low power mode between advertisement.

Measuring with a meter will only show you an average of both the standby and the advertising states.

You need something that can show you the current in real time; eg,

STLINK-V3PWR

X-NUCLEO-LPM01A

(Other too0ls from other suppliers are available)

[Jtron.11]

Hi @Andrew Neil and @Issamos for suggestion and action to move the question to the new thread

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So why are you starting a new design on this board?

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It is a lengthy painfully process from all testing and research and evaluations, but it is also exciting because I try to learn the new thing.

I started with Nucleo-STM32WBA55CG and Nucleo-STM32WBA55-DK1.  I couldn't make a version just using  HAL driver + RTC to wake the system + Standby mode working.  I reached out to the community and I got help from the ST employee to test my code and confirmed it is working and only consumed 2.5uA.  I asked for his exactly set up and he used his Nucleo-STM32WBA52CG which is pretty close to my PCBA design using STM32WBA52KG so I follow.  I know it is not recommended for new design, but I have to have something that work first, and I bought the Nucleo-STM32WBA52CG and as I tested my code it is working and matching with standby power consumption profile for standby mode.

How, exactly, did you measure this?

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I used the external power meter that will be able to go down to nano Amp to measure the current according to the documentation.

Now I could confirm my code on the Nuc-52CG board with simple RTC and standby mode that only consumed 2.5uA (technically it should go lower than 1uA), I move to next goal is having BLE application with standby mode, and that is where I am stuck, and I continue to research and found the thread where seem ST employee has lot of knowledges about Nuc-52CG board.

I am looking for advices and pointers how to configure the example application BLE_Heartrate and sequencer to configure to enter and exit standby mode.

Anything you can help to points me to, I am very appreciated. 

[Andrew Neil]

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@Jtron.11 wrote:

I used the external power meter . 

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Again, a meter will not give useful results.

[Jtron.11]

@Andrew Neil 

It is Nordic power profiler kit ii, it is very accurate and give you the measure as low as nA.