
Hardware
EM357 pin mappings
XBee/XBee-PRO® S2C ZigBee® RF Module
27
Pin
#
Name
Direction
Default
state
Description
3
DIN/CONFIG / DIO14
Both
Input
UART data in
4
DIO12/SPI_MISO
Both
Disabled
GPIO/SPI slave out
5
RESET
Input
Input
Module reset
6
RSSI PWM/PWMO DIO10
Both
Output
RX signal strength indicator/GPIO
7
PWM1/DIO11
Both
Disabled
GPIO
8
[reserved]
-
-
Do not connect
9
DTR/SLEEP_RQ/ DIO8
Both
Input
Pin sleep control line/GPIO
10
GND
-
-
Ground
11
SPI_MOSI/DIO4
Both
Disabled
GPIO/SPI slave in
12
CTS/DIO7
Both
Output
Clear-to-send flow control/GPIO
13
ON_SLEEP/DIO9
Both
Output
Device status indicator/GPIO
14
VREF
-
-
Not connected
15
ASSOCIATE/DIO5
Both
Output
Associate indicator/GPIO
16
RTS/DIO6
Both
Input
Request to send flow control/ GPIO
17
AD3/DIO3/SPI_SSEL
Both
Disabled
Analog input/GPIO/SPI slave select
18
AD2 / DIO2/SPI_CLK
Both
Disabled
Analog input/GPIO/SPI clock
19
AD1/DIO1/SPI_ATTN
Both
Disabled
Analog input/GPIO/SPI attention
20
AD0/DIO0/CB
Both
Disabled
Analog input/GPIO/ Commissioning
button
EM357 pin mappings
The following table shows how the EM357 pins are used on the device.
Note
Some lines may not go to the external device pins in the programmable secondary processor
version.
EM357
pin#
EM357 pin name
XBee
(SMT)
pad#
XBee
(TH)
pin #
Other usage
12
RST
6
5
Programming
18
PA7
8
7