Digi XBEE2

Module support Improving low power current consumption
XBee/XBee-PRO ZigBee RF Modules User Guide 180
GPIO_DIRSETL = GPIO(1) | GPIO(2);// Set GPIO 1,2 as outputs
GPIO_CLRL = GPIO(1);// Drive GPIO 1 low
GPIO_SETL = GPIO(2);// Drive GPIO 2 high
Improving low power current consumption
To improve low power current consumption, the XBee should set a couple of unused IO lines as output low. This
can be done during application initialization as shown below.
XBee (non-PRO) initialization:
/* GPIO 1 and 2 are not used in the XBee (non-PRO) and should be set as outputs and driven low to reduce
current draw. */
GPIO_DIRSETL = GPIO(1) | GPIO(2);// Set GPIO 1,2 as outputs
GPIO_CLRL = GPIO(1) | GPIO(2);// Set GPIO 1,2 low
XBee-PRO modules should disable the power compensation circuitry when sleeping to reduce current draw. This
is shown below.
When sleeping (end devices):
/* The power compensation shutdown line on XBee-PRO modules (GPIO 1) should be set high when entering
sleep to reduce current consumption. */
GPIO_SETL = GPIO(1);
When waking from sleep (end devices):
/* The power compensation shutdown line on XBee-PRO (GPIO 1) should be set low to enable the
power compensation circuitry and LNA. */
GPIO_CLRL = GPIO(1);