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CC2500: part suitability for multiple transmitters to one receiver for health and fitness application

Alessio Cellante
Prodigy 170 points
Part Number: CC2500
Other Parts Discussed in Thread: CC2640R2F, CC2571, CC2511

Goodmorning,

we are looking for a transceiver device to develop a system with one receiver and some transmitters (up to 5 transmitters) to be used in Health/fitness. Each transmitter has the role to send data of sensors and monitor devices to the single receiver which is a USB dongle plugged into a PC. The idea is that all the sensor devices, that are acquiring different data, are paired in a fixed way with a single receiver which is collecting data from sensors and send them to the PC over USB.
Each sensor send a new value (5 byte) every 10ms, so the receiver needs to be fast enought to receive them.
All the sensor devices (transmitters) must be movable. All the system is intended to be used indoor (in a single room) or outdoor.
All the devices has to be as small as possible, so it's better if we use PCB antennas.

The reason we found the CC2500 device is because of the Proprietary 2.4 GHz that probably allow us to develop a system which is away from issue relating to common Bluetooth pairing for the end user. So it will be plug and play without configurations for the end user.

Is this device suitable for the application we need? Is there any better solution?

Thanks.

Is this device suitable for the application we need?

  • 0
    TI__Guru**** 317180 points

    Yes, you can do what you want with CC2500. You can also look into CC2640R2F which is a wireless MCU which will save you some space on the PCB since an extra MCU is not needed. 

  • 0 in reply to TER
    Prodigy 170 points

    Is there any wireless MCU that include an USB port so that it's easy to develop a USB dongle that act as a receiver? I can't find this kind of support for CC2640R2F.

    Is the CC2640R2F configurable as a stand-alone network where transmitters and receivere are already associated each-other?

    I don't know if I need to open a new question but I found also the CC2571 which I seems to be more close to our requirements. Is it applicable for what we need?

  • 0 in reply to Alessio Cellante
    TI__Guru**** 317180 points

    The CC2511 is the only one which include USB that does prop. 

    CC2640R2F do BLE and prop. If you do prop you have to write your own protocol that handle the network protocol etc and then you can do what you want. 

    CC2571 only support ANT and is a network processor. Is that want you need/ want, it sounds like it sets some limitations that you are not interested in. 

     

  • 0 in reply to TER
    Prodigy 170 points

    Focusing on a BLE will give us more flexibility and easiness on managing the transmission?

  • 0 in reply to Alessio Cellante
    TI__Guru**** 317180 points

    BLE is a standard and we provide te full stack.  If you use prop you have to write your own protocol but it enables you to write it to fit your needs. In this case it sounds like you don't need a complex protocol which reduces the overhead by writing your own.   

  • 0 in reply to TER
    Prodigy 170 points

    Ok, independently by the protocol, is it possible to link many transmitters to a receiver without the pairing process even in the case of BLE (usually BLE devices need to be paired together to communicate)? We want to avoid the process of pairing and use another way to add or replace devices in the system.

  • 0 in reply to Alessio Cellante
    TI__Guru**** 317180 points

    I believe that you in this case know the ID/ address for the devices that are allowed in the network. Meaning that you know that device 123 is allowed in the network but not device 067 as an example. That works fine if you have only one system up and running but if you have 3 receivers that needs to receive from 5 transmitters each you have to have a way to know that the transmitter delivered to be placed on person/ network 1 belong to this network. 

  • 0 in reply to TER
    Prodigy 170 points

    Ok, thanks.

    Comparing BLE and prop, is there any differences in the maximum distance and data rate between receiver and transmitters?

  • 0 in reply to Alessio Cellante
    TI__Guru**** 317180 points

    Range: Sensitivity improves both when you reduce datarate and RX BW. Since both are fixed on the different BLE phys you can run lower datarate and RX BW than BLE using prop. If you use https://www.ti.com/tool/RF-RANGE-ESTIMATOR you can get a feeling of the change. If the chip/ datarate is not available in the preselect, select the one that is closest (in dBm) to the one you need.