Pin Connection Recommendations; Xbee Header Connector Requirements; Rssi Pwm - Digi XBee 3 Cellular LTE-M User Manual

Hardware
Pin Name
AD3 / DIO3 / SPI_
17
SS / CTS2
18 AD2 / DIO2 / SPI_
CLK / RTS2
AD1 / DIO1 / SPI_
19
ATTN / I2C_SCL
20 AD0 / DIO0
Note Secondary UART: TX2, RX2, RTS2, and CTS2 (pins 4, 11, 18, and 17) may optionally be configured
as a secondary UART serial port using MicroPython. See
Programming Guide
Note Class I2C: For more information, see

Pin connection recommendations

To ensure compatibility with future updates, make USB D+ and D- (pin 7 and pin 8) available in your
design.
The recommended minimum pin connections are VCC, GND, DIN, DOUT, RTS, DTR and RESET.
Firmware updates require access to these pins.

XBee header connector requirements

The XBee header connectors require the following attributes:
female
n
2 mm pitch
n
10 positions
n
single row
n

RSSI PWM

The XBee Smart Modem features an RSSI/PWM pin (pin 6) that, if enabled, adjusts the PWM output to
indicate the signal strength of the cellular connection. Use
the RSSI pulse width modulation (PWM) output on the pin. If P0 is set to 1, the RSSI/PWM pin outputs a
PWM signal where the frequency is adjusted based on the received signal strength of the cellular
connection.
The RSSI/PWM output is enabled continuously unlike other XBee products where the output is enabled
for a short period of time after each received transmission. If running on the XBIB development board,
DIO10 is connected to the RSSI LEDs, which may be interpreted as follows:
Digi XBee® 3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
Direction Default
Either Disabled
Either Disabled
Either Disabled
Either Input
and for details.
Class I2C
XBee header connector requirements
Description
Analog Input 3 / Digital I/O 3 / SPI low
enabled select line / Clear to Send (CTS2)
Input
See the secondary UART note
information.
Analog Input 2 or Digital I/O 2, SPI Clock line /
Ready to Receive (RTS2) Output
See the secondary UART note
information.
Analog Input 1 or Digital I/O 1, SPI Attention
line output / I2C SCL
See the I2C note below for more information
Analog Input 0, Digital I/O 0
Class UART in the Digi MicroPython
in the Digi MicroPython Programming
P0 (DIO10/PWM0 Configuration)
below for more
below for more
Guide.
to enable
106