Technical specifications
Serial communication specifications
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide
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Serial communication specifications
The XBee/XBee-PRO S2C 802.15.4 RF Module supports both Universal Asynchronous Receiver /
Transmitter (UART) and Serial Peripheral Interface (SPI) serial connections.
UART pin assignments
The SC1 (Serial Communication Port 1) of the Ember 357 is connected to the UART port. The following
table provides the UART pin assignments.
Specifications
Module pin number
UART pins
XBee (surface-mount)
XBee (through-hole)
DOUT
3
2
DIN / CONFIG
4
3
CTS / DIO7
25
12
RTS / DIO6
29
16
SPI pin assignments
The SC2 (Serial Communication Port 2) of the Ember 357 is connected to the SPI port.
Specifications
Module pin number
SPI pins
XBee (surface-mount)
XBee (through-hole)
SPI_SCLK
14
18
SPI_SSEL
15
17
SPI_MOSI
16
11
SPI_MISO
17
4
SPI_ATTN
12
19
GPIO specifications
XBee/XBee-PRO S2C 802.15.4 RF Modules have 15 General Purpose Input / Output (GPIO) ports
available. The exact list depends on the device configuration, as some GPIO pads are used for
purposes such as serial communication.
GPIO Electrical Specification
Value
Low Schmitt switching threshold
0.42 - 0.5 x VCC
High Schmitt switching threshold
0.62 - 0.8 x VCC
Input current for logic 0
-0.5 µA