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CC1310 TX Power Consumption

Other Parts Discussed in Thread: CC1310

Hi,

My customer reported around 40mA peak current when CC1310 7XD is transmitting at 14dBm output power. I have used the Launchpad to verify and find the same. Details as below.

1. Datasheet spec, we can see 10dBm transmit current is 12.9mA and 14dBm is 22.6mA.

2. Setup using launchpad

Using 3V battery to power the Launchpad, with a 10 Ohm resistor in serial to measure the current. All jumpers are removed.

Software #1 : Using the rfPacketTX, 10dBm output power; 

Software #2 : Using the rfPacketTX, 14dBm output power; (CCFG_FORCE_VDDR_HH is set);

3. Experiments results:

Above is for 10dBm TX power, we can see the current is around 210mV on 10 Ohm resistor, which is around 21mA.

Above is 14dBm output power, it's 400mv which is 40mA.

Questions:

Even we take the 48MHz active M3 into consideration (2.5mA), the current is still high. (I don't think the external flash would consume too much power).

Could you help review above experiments and share comments? Thanks. 

  • The picture above shows the current consumption on the CC1310 LP with the rfPacketTx running with the 14 dBm setting. 

    I notice from the picture that the LP is placed on something that looks like a ESD mat. If this is the case the ground level in the ESD mat will detune the antenna and the power consumption will go up. Try to do the measurement with the antenna in some distance from other objects. 

  • HI TER,

    Thanks for the information. I've verified that the Mat will indeed influence the measurements. Also, I found if i hold the ground part of the board will also impact lot. 

    The strange part is if I left the board in the air, the current consumption will be higher than I put it on my laptop. Is this making sense? Thanks.

  • The size of the ground plane will impact the antenna tuning. If you hold on the ground part of the board you will change the size of the ground and thereby change the tuning. Changing the tuning could cause the power consumption to change, we have mostly seen that the power consumption goes up but looking at the load pull data the power also goes down for some loads.

    Having the Launchpad in the air will most likely mean the antenna is close to 50 ohm.