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Choice of MCU for a Self-Powered Wireless Current Transformer

Zhi Jing
Prodigy 50 points
Other Parts Discussed in Thread: CC1310, CC1312R, CC2642R, CC2640R2F

Hi all,

I have been assigned a project to develop a Self-Powered Wireless Current Transformer.

A number of low-level nodes measure the current through a current transformer, then send the information to a master.

The requirements are:

Power for the entire system is extracted from the secondary side of the Current Transformer, therefore the MCU has to be as low power consumption as possible.

Has an integrated RF module (To further lower power consumption)

I initially chose CC1310, however, I am not sure if this is the best choice for my application. 

Which MCU/Module fits my application the most?

Zhi Jing

  • 0
    TI__Guru** 106705 points

    Hi Zhi,

    What is your range requirement? Have you considered 2.4 GHz? That would give you lower transmit current consumption and allow you to use smaller antenna.

    The CC1310, CC1312R, CC2640R2F or CC2642R would all be good devices for this application. You can leverage the sensor controller to handle the actual current measurement in a very low power manner. Note that the CC1312R and CC2642R have improved power consumption for the Sensor Controller.

    Regards,
    Fredrik

  • 0 in reply to Fredrik K
    Prodigy 50 points

    Hi Fredrik,

    Thanks for replying. The required range is 10 - 20 meter under industrial environments. Does 2.4 Ghz work well under interference? The logic for the slave device is going to be fairly simple, therefore very low processing power is going to be required (The MCU should be in lowest power mode or shut down for the majority of the time, too).

    Regards,

    Zhi

  • 0 in reply to Zhi Jing
    TI__Guru** 106705 points

    Hi Zhi,

    The CC26xx devices have good blocking and selectivity performance, so generally they will cope well under interference. Exactly how the interference will affect your system does of course depend on a lot of different factors, so I recommend you do some testing in the actual environment your application will be operating in. You can also implement frequency hopping, or use BLE, to mitigate interference issues.

    Regards,
    Fredrik