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CC2541 current consumtion(power consumption) for starting up

HONG GAO2
Prodigy 250 points
Other Parts Discussed in Thread: CC2541

Dear TI,

I have a question about the power consumptions for starting up CC2541.

I'm using  the CC2541 with the sample project "SimpleBLEPeripheral" in BLE-CC254x-1.4.0 (IAR EW).

and I have a problem that the power comsumption is huge for starting up.

I used an ideal voltage source to provide a 3V voltage for monitoring the start-up operation,

and I found that the start-up mode lasts for about 500ms with a steady current of about 8mA.

This power consuption is really huge for BLE, in my opionion.

Is there anyway to reduce the current in the start-up mode or anyway to reduce the start-up time?

 

Best regards,

HG

 

 

 

 

  • 0
    Expert 2500 points

    Hi,

    You can try out following things in firmware: 

    1. Increase advertisement interval.

        change value of this macro "DEFAULT_ADVERTISING_INTERVAL". default value is 160 (100ms) change it to 400 (250ms). you should be able to see reduction in power consumption. 

    2. Reduce transmission power. 

    At the end of "SimpleBLEPeripheral_Init" function put

    TXPOWER = 0x31;     // Set tx power to minimum = -23 db, default value is 0 db.

    Also change Tx power value in "scanRspData" array where last value indicates Txpower. Change it to -23 from 0. you might get warning about -23 but ignore it. 

    These are ways to reduce power during advertisement. 

    ----------------------------------------------------------------------

    Press "Verify" if your question is answered correctly.

  • 0 in reply to Maulik Vaghela
    Prodigy 250 points

    Thank you for your reply.

    But these are the ways to reduce power during advertisement.

    What troubles me is the large power consumption during initialization, namely, during the state before CC2541 reaches steady advertisement mode.

    Is there any way to reduce power during the intialization state?

  • 0 in reply to HONG GAO2
    Expert 2500 points

    Hi,

    I have suggested possible solution on another thread of yours. 

    Here: http://e2e.ti.com/support/wireless_connectivity/f/538/t/365938.aspx.

    Ttry this and please let us know your findings. 

    Maulik.