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CC2541 chip in PAN1721 module

Bojan Jovanovic
Intellectual 320 points

Other Parts Discussed in Thread: CC2541

Hello guys,

I'm using PAN1721 BLE module whose brain is made of TI's CC2541 chip.

I would like to know the answer on a  few empirical questions:

1. What is a guaranteed communication range that can be obtained using PAN1721 ? In PAN1721 datasheet there is a following statement: "Excellent link budget (up to 96 dB), enabling long-range applications". So what exactly does it means? How many meters: 20m or more ?

2. Which transmission speed can be achieved on the SPI interface of CC2541 (1Mbps, 4Mbps or higher) ?

3. What is the approximate weight of a PAN1721 module ? 1 gram or more.

Thank you very much for your time and efforts to help me.

Sincerely,

Bojan

  • 0
    Guru 22270 points
    Hello Bojan,

    1. There is an Excel Spreadsheet that provides an estimate of The range for the CC254x devices. e2e.ti.com/.../375823
    You will typically get 10 to 20 meters in a concrete building through walls. Through a wall to open air around 20 to 30 meters. In open air with line of sight expect 100 meters and more. Check the spreadsheet.

    2. I have used Transmission speeds of SPI_BAUD_E = 19 (8MHz?) with SPI for communication with a TFT LCD with ST7735 controller without any issues.

    3. The weight from supplies is given as 0.05 Kg.

    You can find the User's Guide for the CC254x here www.ti.com/.../swru191

    Thanks,
  • 0 in reply to Greenja
    Intellectual 320 points
    Hi greenja,

    Thank you very much for your prompt reply and useful info.

    Regarding the speed of SPI communication... frankly, I don't have any idea how to transfer 8 MHz SPI frequency to Mbps !? :) If you know it, please convert the speed you mentioned into Mbps.

    0.05 Kg (50 g) seems pretty "hevy" to me for one little module like PAN1721.

    Thank you for the CC254x user's guide.

    Regards,
    Bojan.
  • 0 in reply to Bojan Jovanovic
    Guru 22270 points

    Hello Bojan,

    In the User's Guide, section 17.4 details how the baud rate is generated from the clock frequency.  The module weight is based on the shipping estimate value found on the distributors sites.  I did not see any numbers given in the data sheets.

    Thanks,

  • 0 in reply to Greenja
    Intellectual 320 points
    Thanks buddy,

    You are the best! :)

    Cheers,
    Bojan.