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current consumption; CC2510

Stefan Steger
Prodigy 10 points
Other Parts Discussed in Thread: CC2510, Z-STACK, CC2430

To verify the current consumption of the CC2510 at the different Power Modes, I plugged a 1.2, 11 and 22 ohm shunt resistor between the SmartRF04EB and the VDD pin of the CC2510EM. To get a adequate resolution in the measured voltage I used a non-inverting amplifier with a gain of 1000. On the CC2510 I used the PM (Power Mode) Software Examples.

Now I have several problems understanding the measured results. There are current peaks of 15-20 uA at frequencies of 660 Hz (with the 1.2 Ohm Shunt), 266 Hz (11 Ohm Shunt) and 380 Hz (22 Ohm Shunt).

Furthermore I had results in the current consumption of 5.37 mA in Active Mode, 3.9 mA in Power Mode 0, 0.65 mA in Power Mode 1 and 0.5 mA in Power Mode 3. So it is way to much compared to the values in the datasheet.

The transition time between PM1 and Active Mode took about 0.8 ms. In the datasheet it is specified with 4us.

I would be very thankful for any suggetions.

Thank you very much!

Stefan

 

 

  • 0
    TI__Expert 4470 points

     Hi Stefan,

    It could be you will get more accurate results if you power the EM directly from a power supply and not use the SmartRf04EB. The application note AN053 describes current measurements done on the CC2430 and Z-stack software. The hardware setup used in the application note was only a standalone EM powered directly from power supply. You can see more information on the HW setup in the document. It can be found here: http://www.ti.com/litv/pdf/swra144

    Hope this will give some help.

    Regards,

    Bjørn

     

  • 0
    Expert 1670 points

    Have you had any further luck with this yet?

    I would question the op-amp circuit used to amplify the current measured through the resistor. Any small input offset voltage or input bias currents can lead to a large offset in the measurement. Have you tried a null measurement (measure current with the circuit turned off, or just measure current with the 1.2 ohm resistor connected to ground with no power)?

    If there's a large offset, I'd try measuring a different way - do you have a 6 1/2 digit benchtop type meter? 

    Next, check that all peripherals and I/O are shut down and in their proper states. Check for pull-ups or pull-downs enabled that could be fighting anything else. I don't recall if the Software Examples set all the I/O properly or not. 

    The 4us PM1-> Active Mode is specified for keeping the HS RC and HS XOSC powered down - are you running off of the 32khz oscillator for this test?

    Are the current spikes of 15-20ua or 15-20mA? I'm asking because it seems difficult to see 15-20uA on top of 5mA average.

    Sorry, that's all I can think of for now...

    -Chad