Xbee Rf Module Power Supply; Powerdown Mode - RabbitCore RCM4500W User Manual

C-programmable zigbee core module

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when operating close to the 3.0 V minimum voltage (for example, keep the power supply as close as

possible to the RCM4510W) since your RCM4510W could reset unintentionally.

The RCM4510W has a reset output, pin 3 on header J1.

C.1.4 XBee RF Module Power Supply

The XBee RF module is isolated from digital noise generated by other components by way of a low-

pass filter composed of L5 and C90 on the RCM4510W as shown in Figure C-3. The filtered power

supply powers the XBee RF module, and is available via pin 8 of auxiliary I/O header J4 on the

RCM4510W module. If you draw on this filtered power supply, the maximum current draw is 25

mA.

+3.3 V

Filtered +3.3 V Supply

to ZigBee Modem

C90

10 µF

Figure C-3. XBee RF Module Supply Circuit

C.2 Powerdown Mode

The XBee RF module can power down the remaining RCM4510W circuitry via the

or the

Dynamic C function calls. The real-time clock

zb_Rabbit_poweroff()

xb_sleep()

and the data SRAM will still be powered during the powerdown from the +3.3 V DC supplied to

the RCM4510W module via header J1 as long as that voltage exceeds the voltage of the backup

battery.

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