cc2420 current draw

vreg

Prodigy 90 points

Other Parts Discussed in Thread: CC2420

Hi,

The CC2420 datasheet defines current draw for different states as follows:

Power Down mode: 20 uA

Idle mode: 426 uA

Receive mode: 18.8 mA

Transmit mode: 17.4 mA (at 0 dBm)

Do Receive/Transmit correspond to the state when the transceiver is active and actually receiving/transmitting a packet OR just when the transceiver is active i.e. receiver/transmitter is ON?

If its the second case, what does Idle state refer to?

Thanks.

over 11 years ago

0 TER over 11 years ago

TI__Guru**** 317180 points

The current consumption is measured when the device is actually sending/ receiving.

0 vreg over 11 years ago in reply to TER

Prodigy 90 points

Hi,
So the current consumption when the receiver/transmitter is ON (but not transmitting/receiving) is equal to 426 uA, i.e. the current in Idle state.. And power down is when the receiver/transmitter is off... right?

0 TER over 11 years ago in reply to vreg

TI__Guru**** 317180 points

No. In Rx the current will be the same if you receive or not receive as long as the chip is in Rx. Not sure if the question is valid in Tx since if you strobe Tx the chip will send whatever is in the buffer. In power down nothing is on.

0 vreg over 11 years ago in reply to TER

Prodigy 90 points

So when exactly does the Idle state come into the picture, since the transceiver can either be ON or OFF:
When it is ON its either in Receive/Transmit mode..
When it is OFF its in Power Down...

0 TER over 11 years ago in reply to vreg

TI__Guru**** 317180 points

In IDLE the receive and transmit path are off but the synth and xosc are on.

0 vreg over 11 years ago in reply to TER

Prodigy 90 points

Could you please elaborate how IDLE state is reached ? What is its use?

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cc2420 current draw