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2540 / 2541

Afshin Zand
Prodigy 10 points
Other Parts Discussed in Thread: CC2540, CC2541

Hi

We are looking to incorporate one of your Bluetooth LE ICs into a product we are developing.  I trust the choices above are the correct ones, right ?

I have looked at the comparison chart here : http://www.ti.com/product/CC2540/compare  .  Please let me know what the major difference is between the two, aside from anything on the chart (which seems to indicate mainly the data rate of 1 MB/s vs 2, and sleep current draw of 0.4 vs 0.9 uA).

And now to our main question: Upon wake-up by the sleep timer, how long in ms do these two processes take:

1) Re=service of the sleep counter (if we want to load it again and don't want to do anything else)

2) After a number of such loads of the sleep counter,  how long would a standard communication session with the host take in ms (such as in your software) ?  If you are able to, can you specify the Receive time and Transmit time in ms so we can calculate the current draw ?

Thank you

Afshin Zand

afshin.zand@microrfid.com

  • 0
    TI__Guru 56590 points

    Hello Afshin,

    I am a little confused on what you want. If you want to use Bluetooth Low Energy (BLE) you cannot choose data rate ( it is fixed at 1Mbps with 250 kHz deviation). The CC2541 can also be run in proprietary mode meaning that you can develop your own code on it. In that case you can also switch to other rates (250 kbps, 500 kbps, 1Mbps and 2Mbps). When using BLE, the stack is controlling the radio and power states. You can look at the following app not to get some more details on CC2541 power consumption:

    http://www.ti.com/general/docs/litabsmultiplefilelist.tsp?literatureNumber=swra347a

    Also there is a lot more info on the product pages and wiki.

    In your point 2) it is impossible to say without knowing all the details on both end of the system. There are a lot of parameters to take into account and possibly even some statistics to be able to calculate the average current for such a scenario.