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  • Case ID: 105523
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High current consumption during RF sending

Vicnet

Hi,

  1. I would to know why when the DC/DC is enabled the current is very high (57mA) during RF sending.

  2. Why at the end of RF sending the current is higher than previously (15.4mA -> 16.5mA) & 12.3mA -> 57mA)

Test conditions:

  • nRF51822 - (Insight 130301)

  • RF sending every 90ms

  • Payload size: 32bytes

  • Supply voltage 2.400V

image description

Thanks you

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    As for your DCDC measurement, I recall when I used to work with the Ti CC2540 that when using a DCDC, there can be high swing currents at the enable/disable points. This is due to the fact that the Voltage rail switches from Coil Cell level (3.0V) to DCDC level (~2.1V on Nordic) and back during RF events. With this voltage swing you will see an in-rush current when measuring the board with a resistor. Though 57mA seems quite high.

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    As for your DCDC measurement, I recall when I used to work with the Ti CC2540 that when using a DCDC, there can be high swing currents at the enable/disable points. This is due to the fact that the Voltage rail switches from Coil Cell level (3.0V) to DCDC level (~2.1V on Nordic) and back during RF events. With this voltage swing you will see an in-rush current when measuring the board with a resistor. Though 57mA seems quite high.

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