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Hardware
Pin
Name
30
DIO3/AD3
31
DIO2/AD2
32
DIO1/AD1
33
DIO0/AD0
34
[Reserved]
35
GND
36
RF
37
[Reserved]
Notes
Minimum connections: VCC, GND, DOUT and DIN.
Minimum connections for updating firmware: VCC, GND, DIN, DOUT, RTS and DTR.
The table specifies signal direction with respect to the device.
The device includes a 50 kΩ pull-up resistor attached to RESET.
Use the PR (Pull-up/Down Resistor Enable) command to configure several of the input pull-ups.
You can connect other pins to external circuitry for convenience of operation including the Associate
LED pin (pin 15). The Associate LED flashes differently depending on the state of the device.
Leave any unused pins disconnected.
Design notes
The following guidelines help to ensure a robust design.
Power supply design
A poor power supply can lead to poor device performance, especially if you do not keep the supply
voltage within tolerance or if it is excessively noisy. To help reduce noise, place a 1.0 μF and 8.2 pF
capacitor as near as possible to pin 1 on the PCB. If you are using a switching regulator for the power
supply, switch the frequencies above 500 kHz. Limit the power supply ripple to a maximum 100 mV
peak to peak.
Board layout
We design XBee devices to be self sufficient and have minimal sensitivity to nearby processors,
crystals or other printed circuit board (PCB) components. Keep power and ground traces thicker than
signal traces and make sure that they are able to comfortably support the maximum current
specifications. There are no other special PCB design considerations to integrate XBee devices, with
the exception of antennas.
Antenna performance
Antenna location is important for optimal performance. The following suggestions help you achieve
optimal antenna performance. Point the antenna up vertically (upright). Antennas radiate and receive
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide
Direction
Function
Both
Digital I/O 3 / Analog input 3
Both
Digital I/O 2 / Analog input 2
Both
Digital I/O 1 / Analog input 1
Both
Digital I/O 0 / Analog input 0
-
Do not connect
-
Ground
Both
RF connection
-
Do not connect
Design notes
23
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