cc1120 sleep problem

Michele Mancini

Intellectual 276 points

Other Parts Discussed in Thread: CC1120

Hi,

I try to send cc1120 in sleep mode.

In the datasheet the consumption in this mode is 0.3uA but in my tests the consumption is ~230uA !!!

To send cc120 in sleep mode, I send these commands :

trxSpiCmdStrobe(CC112X_SRES);
trxSpiCmdStrobe(CC112X_SXOFF);
trxSpiCmdStrobe(CC112X_SPWD);

The measured current after these commands is ~230uA (3.3Vcc power).

How can I reach the value of 0.3uA?

over 12 years ago

0 TER over 12 years ago

TI__Guru**** 317180 points

Please check the state on the MCU IOs. Note that the SO line from CC1120 is high impedance default and hence undefined in SLEEP which could cause increased power consumption.

CC1120 should consume <1uA in power down.

0 Michele Mancini over 12 years ago in reply to TER

Intellectual 276 points

The problem is in my MCU? ,

In my MCU I go power low mode with IO in alalog high impedence

0 Michele Mancini over 12 years ago in reply to Michele Mancini

Intellectual 276 points

Now I have 50uA , but I am still far from <1uA

//Disable I/O

writeByte = 0x80;
cc112xSpiWriteReg(CC112X_IOCFG3, &writeByte, 1);
writeByte = 0x80;
cc112xSpiWriteReg(CC112X_IOCFG2, &writeByte, 1);
writeByte = 0x80;
cc112xSpiWriteReg(CC112X_IOCFG1, &writeByte, 1);
writeByte = 0x80;
cc112xSpiWriteReg(CC112X_IOCFG0, &writeByte, 1);

trxSpiCmdStrobe(CC112X_SXOFF);
trxSpiCmdStrobe(CC112X_SPWD);

What is missing to reach the target <1uA ?

0 TER over 12 years ago in reply to Michele Mancini

TI__Guru**** 317180 points

Do you measure the current to flow in CC1120 only? (MCU etc is not in the measurement)

Try to probe all pins and see if a pin has a potential different from 0V or Vdd.

Other wireless

Other wireless technologies forum

cc1120 sleep problem