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HM-10 (CC2541 used) low power mode

Tareq Khan
Prodigy 70 points

Other Parts Discussed in Thread: CC2541, CC2640, CC2541DK-MINI

Hi All,

I am using a HM-10 module ( https://www.fasttech.com/product/1292002-ti-cc2540-cc2541-bluetooth-4-0-ble-2540-2541  which has a CC2541 mcu, both external crystals, passive components and antenna). I have downloaded SimpleBLEPeripheral code to HM-10. 

I made the following changes in the code as suggested in AN092 (http://www.ti.com/lit/an/swra347a/swra347a.pdf) to go to power saving modes. 

1. To eliminate the periodic event from the application, commented out the following line of source code from the SimpleBLEPeripheral_ProcessEvent function in the file simpleBLEPeripheral.c:

// osal_start_timerEx( simpleBLEPeripheral_TaskID, PERIODIC_EVT, PERIODIC_EVT_PERIOD );

2. In SimpleBLEPeripheral_Init function, the variable initial_advertising_enable was set to TRUE instead of FALSE, as such:

uint8 initial_advertising_enable = TRUE;

I put an ammeter to measure the current of the HM-10 module. It should go to PM2 or PM3 mode automatically as POWER_SAVING symbol has been defined. 

However, the current is always around 8mA, which means it is not going to PM2 or PM3 mode. 

I changed DEFAULT_DESIRED_MAX_CONN_INTERVAL, DEFAULT_DESIRED_MIN_CONN_INTERVAL, DEFAULT_DESIRED_CONN_TIMEOUT to different values, however I see no change in current consumption, it always around 8mA.

I connected with the HM-10 with an Android phone "BLE Scanner" app, and current is always around 8mA.

Can you please suggest how can I go to PM2 or PM3 mode? If it goes to PM2 or PM3 mode, then my plan is to wake the device up by external interrupt.

Thanks in advance. 

  • 0
    TI__Guru** 105180 points
    Hello Tareq,

    Which SimpleBLEPeripheral project configuration did you use? Did you disable the LCD if it was defined? Did you take scope plots of the current use?

    Regarding HM-10, this module is not manufactured by TI and here have been known to be clones on the market. I would suggest you use the CC2541-MINIDK if you need to make precise power measurements as specified by the app note.

    Also, the LAUNCHXL-CC2650 may be a better platform low power development on the CC2640 wireless MCU.

    Best wishes
  • 0 in reply to JXS
    Prodigy 70 points

    Hi JXS, 

    Thanks for your quick and informative reply.

    I am using CC2541DK-MINI Keyfob configuration, the library version is BLE-CC254x-1.4.1.43908b. 

    The HAL_LCD is set as FALSE in the preprocessor tab.

    I have used current sensor for logging data in PC and found that the current is always around 8mA.

    The HM-10 has CC2541 chip and I found its ADC, AC, Digital PORTS, UART etc working as usual. However, the power mode is the problem. It is not going to PM2 or PM3. 

    I experimented with the code:

    halSleep (0) ;

    and found that the current goes to 0.33mA, however it does not wake up on external interrupts (except reset).

    Thanks for suggesting the new alternatives, however I have already made my design PCBs and invested money on CC2541. I could use raw CC2541 chip and other passive parts without using the HM-10 module, however it makes the PCB design task more complicated.

    Any more idea on how to solve the power mode problem?  

    Thanks in advance.

  • 0 in reply to Tareq Khan
    TI__Guru** 105180 points

    Did you disable the HAL LED an Key definitions in the project settings?

    Best wishes