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CC2642R: Cell coin battery suitability for BLE

Guru 18595 points
Part Number: CC2642R
Other Parts Discussed in Thread: CC2640, CC2541

Dear,

long time no see! :)

I am about to start a project with BLE and was considering cc2642R.

Now, 3 questions come to my mind:

  1. cc2640 employs 6.1 mA to transmit 0 dBm while cc2642R employs 7.4 mA. Just being curious, why is that? Thought the only differences where in terms of memory size.
  2. What is the energy required to transmit, say, 1 MByte of data?  I did some rough calculations and the minimum memory I would want to use is 128 MBytes (1024 Mbits).  How much battery capacity would it take to transfer that data?  And how long would it take?
  3. I think so, but, in your opinion, would the previous point discard the usage of a cell coin battery? That is, around 200 mAh.

Ok guys, really excited to know your points of view.

Have a really nice day!

  • Hi Kazola,

    Welcome back! Good to see that you are considering the CC2642R!

    1. The CC2642R is a bit more capable than the CC2640. For example is the RF core running at a higher clock frequency.
    2. You can take a look at the current calculator we have here: www.ti.com/.../toolssoftware . To change the packet length you would have to manually adjust the TX time for now. To simplify it a bit, 1024 Mbit of data at a rate of 1 Mbps will take 1 second in continuous TX. If you are using BLE you will of course have to break it up in multiple packets, so there will be quite a bit of overhead on top of that.
    3. No, I would not say that it does. We seem to lose perspective a bit as the device current consumption has improved over the years. Keep in mind, there were a lot of people making coin-cell operated devices with CC2541 back in the days :-)

    Regards,
    Fredrik
  • Really nice answer, thanks! :)