XBee®/XBee‐PRO® ZB SMT RF Modules
Pin Signals
Pin Assignments for XBee Modules
(Low‐asserted signals are distinguished with a horizontal line above signal name.)
Pin #
Name
GND
Direction
Default State
Description
Ground
1
2
-
-
-
VCC
-
Power Supply
3
DOUT / DIO13
DIN / CONFIG / DIO14
DIO12
Both
Both
Both
Input
Both
Both
-
Output
Input
UART Data Out / GPIO
UART Data In / GPIO
GPIO
4
5
6
RESET
Module Reset
7
RSSI PWM / DIO10
PWM1 / DIO11
[reserved]
Output
Disabled
Disabled
Input
RX Signal Strength Indicator / GPIO
Pulse Width Modulator / GPIO
Do Not Connect
8
9
10
11
DTR / SLEEP_RQ / DIO8
GND
Both
-
Pin Sleep Control Line / GPIO
Ground
-
Serial Peripheral Interface Attention
Do not tie low on reset
SPI_ATTN / BOOTMODE
/ DIO19
12
Output
Output
13
14
15
16
17
18
19
20
21
22
23
24
25
26
GND
SPI_CLK / DIO18
SPI_SSEL / DIO 17
SPI_MOSI / DIO16
SPI_MISO / DIO15
[reserved]*
-
-
Ground
Serial Peripheral Interface Clock / GPIO
Serial Peripheral Interface not Select / GPIO
Serial Peripheral Interface Data In / GPIO
Serial Peripheral Interface Data Out / GPIO
Do Not Connect
Input
Input
Input
Input
Input
Input
Output
Output
Disabled
Disabled
Disabled
Disabled
-
-
[reserved]*
-
Do Not Connect
[reserved]*
-
Do Not Connect
[reserved]*
-
Do Not Connect
GND
-
Ground
[reserved]
-
Disabled
Disabled
Output
Output
Do Not Connect
DIO4
Both
Both
Both
GPIO
CTS / DIO7
Clear to Send Flow Control / GPIO
Module Status Indicator / GPIO
ON / SLEEP / DIO9
Not used for EM357. Used for programmable
secondary processor. For compatibility with other
XBee modules, we recommend connecting this pin
to the voltage reference if Analog Sampling is
desired. Otherwise, connect to GND.
27
VREF
Input
-
28
29
30
31
32
33
34
35
36
37
ASSOCIATE / DIO5
RTS / DIO6
AD3 / DIO3
AD2 / DIO2
AD1 / DIO1
AD0 / DIO0
[reserved]
GND
Both
Both
Both
Both
Both
Both
-
Output
Input
Associate Indicator / GPIO
Request to Send Flow Control / GPIO
Analog Input / GPIO
Analog Input / GPIO
Analog Input / GPIO
Analog Input / GPIO
Do Not Connect
Disabled
Disabled
Disabled
Input
Disabled
-
-
Ground
RF
Both
-
-
RF IO for RF Pad Variant
Do Not Connect
[reserved]
Disabled
• Signal Direction is specified with respect to the module
• See Design Notes section below for details on pin connections.
• * Refer to the Writing Custom Firmware section for instructions on using these pins if JTAG
functions are needed.
© 2010 Digi International, Inc.
11
DCD [ DIGITAL CORE DESIGN ]
