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CC 2511 Sleep Mode, Current Consumption

Omid
Prodigy 130 points
Other Parts Discussed in Thread: CC2511

Hi,

I am using a cc2511 and I put it in sleep mode PM2. I am measuring the current drawn and it is about 20uA ,but based on datasheet it must be around 0.5uA in this mode.

I am wondering if anybody knows what the problem can be.

BTW, I am using the CC2511 USB Dongle.

 

I really appreciate your help.

 

Omid

  • 0
    TI__Expert 3595 points

    Usually this is because a general I/O pin is configured as an output and pulled high/low with a load on it.  Check how your I/O pins are configured and look for one that could be pulling current.

    Chris

  • 0 in reply to Chris M
    Prodigy 130 points

    Hi Chris,

     

    Thanks a lot for the message. Actually, I already looked at that. I have no load on any of the ports and they are all set as output.

    I thought, that high current might be drawn by regulator on the dongle. Any idea??

     

    Omid

  • 0 in reply to Omid
    TI__Genius 10955 points

    Another typical issue with the I/Os when doing current measurements in low power modes are the P1.0 and P1.1 pins. Those pins do not have pull-up/pull-down capability, and if they are not connected, they will be floating. This increases the current consumption. If these pins are not connected to GND or VDD, they should be configured as outputs. If they are connected to a high-impedance component such as an LED, they should be outputs with the value that causes no current to run (an LED should be off, for instance).

    Furthermore, the other GPIO pins are configured with pull-ups by default. If any of these pins are pulled low externally, there will be some current. To avoid this, such pins should be configured as tri-state or pull-down.