
Hardware
Pin signals
Digi XBee® 3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
105
The following table shows the pin assignments for the through-hole device. In the table, low-asserted
signals have a horizontal line above signal name.
Pin
Name
Direction
Default
Description
1
V
CC
Power supply
2
DOUT
Output
Output
UART Data Out
3
DIN / CONFIG
Input
Input
UART Data In
4
DIO12 / SPI_MISO
/ TX2
Either
Disabled
Digital I/O 12 / SPI Slave Output line /
Transmit (TX2) Output
See the
below for more
information.
5
RESET
Input
6
PWM0 / RSSI /
DIO10/USB_VBUS
Either
Output
PWM Output 0 / RX Signal Strength Indicator /
Digital I/O 10
7
PWM1 /
DIO11/USB D+ /
I2C_SDA
Either
Disabled
PWM Output 1 / Digital I/O 11 or USB Direct
D+ line / I2C SDA
See the
below for more information.
8
USB D-
USB Direct D- line
9
DTR / SLEEP_RQ/
DIO8
Either
Disabled
Pin Sleep Control Line or Digital I/O 8
10
GND
Ground
11
DIO4 / SPI_MOSI /
RX2
Either
Disabled
Digital I/O 4 or SPI Slave Input Line / Receive
(RX2) Input
See the
below for more
information.
12
CTS / DIO7
Either
Output
Output Clear-to-Send Flow Control or Digital
I/O 7
13
ON /SLEEP/DIO9
Output
Output
Module Status Indicator or Digital I/O 9
14
VREF
-
Feature not supported on this device. Used
on other XBee devices for analog voltage
reference.
15
Associate / DIO5
Either
Output
Associated Indicator, Digital I/O 5
16
RTS / DIO6
Either
Disabled
Input Request-to-Send Flow Control, Digital
I/O 6