Problems with Sleep of XBEE-Wi-Fi

XBee & XBee Gateway XBee - WiFi
1

Hello,

I am using the XBEE-Wifi module in the following configuration:

  • communication via SPI
  • sleep mode: Pin sleep with SleepRQ (SM 1)
  • sleep options: associated sleep (SO 0x40)
  • sending and receiving data over UDP.

Without the sleep mode, all runs perfect for hours.

The sleep mode is controlled by the processor as follows:

The processor sets the SleepRQ to high, if there is nothing to send and the pin SPI_nATTN is high. The XBEE answers by pulling On_nSleep low.
If either there is something to send or the SPI_nATTN goes low, the processor deactivates SleepRQ and waits until On_nSleep goes high. After that, the SPI data is read or written. After that SleepRq is activated again.

Problem 1:

after about 10 to 20 seconds successful data transfers with sleep states between, the signal On_nSleep hangs at low level.

I know of the known issue of Version 102D:

Sometimes the SleepRq pin must be toggled more than once to awaken the module.
Toggling the signal SleepRQ as it is described does not change anything, the signal On_nSleep stays low until I reset the module.

If the module hangs in this way, I made the following observations:

  • Power consumption is high (140mA)!
  • The Associate Indicator (DIO5) blinks
  • SPI_nATTN is low

Problem 2:

not so often, the opposite problem appears: The module will not go into sleep mode. This problem can only be resolved with a module reset.

The observations in this case:

  • Power consumption is high (140mA)
  • The Associate Indicator (DIO5) blinks
  • SleepRQ is high
  • On_nSleep is high
  • the module does not answer AT commands, even when SleepRQ is set to low again

Because we are using the XBEE in a mobile battery powered device, the sleep mode is essential for us.

Thank your for your help.

Best regards
Joachim

2

Joachim,

can you replicate the problem if you put the xbee wifi on the digi daughter board?

Keith

3

Hi Keith,

no I can’t, because I cannot activate the SLEEPRQ Pin on the eval board like my application does.

regards
Joachim

4

I have the same problem regarding to the pin sleep mode. My XBee just freezes and refuse to work again, even if I drive the SLEEP_RQ pin low manually the

I use a XBee WIFI with firmware 102D, Sleep mode: pin Sleep, and Sleep options: 140 (associated sleep), mounted on an Arduino WIFI shield and controlled by an arduino UNO.

What I found is that if I set the arduino to wake the XBee with an interval between sleeping and waking of 2+ seconds it work fine. I can read, send, wake and sleep perfectly. But if I set less time it freezes.

Did you find any solution or workarround in your case?

Thanks

5

I have the same problem with the pin sleep mode.
When it works, the current is 140mA, pin 9 is low, and pin 13,15 high.
when i set it sleep ,the parameters are same…

It still confuses me…