R309 AT Commands
©2015 Telegesis (UK) Ltd - 115 - AT Command Manual (Rev 3.09)
6 ETRX357 Power Consumption (Provisional data)
Typical values at 3.3V 25°C.
Table 8: Power Consumption
Table 9: Averaged power consumption during operation
Notes:
- Sleep modes 1-4 should not be used on a router or coordinator, however it was found that mode 1
may work on a router with light to medium network traffic. Successful operation of a router in mode
1 cannot be guaranteed and needs to be evaluated carefully for each target application in case the
additional energy saving is vital.
- Wakeup from modes 3 and 4 is only possible by external interrupt or reset. Make sure never to set
the initial power mode (S3A) to mode 3 or 4 unless you want the device to always wake up into this
mode.
- Modules in power mode 2-4 will not respond to commands at the serial port, so always make sure
you have defined means to wake it up from these modes.
- Mode 4 is the same as mode 3 except that the device does not wait for any pending
acknowledgements before sleeping.
- If no means of waking up from any of the power down modes has been defined and the module
appears unresponsive the Telegesis factory default resetter can be used to reset the modules
factory defaults via the serial port.
- In order to achieve ultra low power consumption of sub 1µA it is required to either define all I/Os to
be outputs, or to pull all inputs to a defined level as floating input pins will increase the current
consumption.
Approximate value, assuming the unit polls every second. If no polling and other timed actions are
performed the power consumption can be as little as 1.5µA in this mode.
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