Revision 1.0 11/2009 Page 4 of 8 www.semtech.com
© Semtech 2009
SM1231
USER GUIDE
• SMA Connector: Provided for SMA Cable or antenna connection. Each board is delivered with a
quarter-wave SMA antenna appropriate to the frequency band of operation. Note that the
SM1231 module has two independent connectorized RF ports; RF_IO, the common LNA and low
power transmitter PA port and RF_PA, the high power transmitter port.
• VDD jumper: Enables current consumption to be monitored and / or apply independent power
supply to the module. When VDD jumper is made, power should be supplied via the MCU
connector.
The pin-out of the MCU connector is tabulated below in Table 1.
PIN # NAME TYPE DESCRIPTION
1 SCK I SPI Clock Input
2 VDD I Supply Voltage Connection
3 MOSI I SPI Data Input
4 GND - Ground Connection
5 DIO1/DCLK I/O Digital I/O, Software Configurable
6 DIO3 I/O Digital I/O, Software Configurable
7 NSS I SPI Chip Select
8 MISO O SPI Data Output
9 DIO5 I/O Digital I/O, Software Configurable
10 RESET I/O Reset Trigger Input / POR Flag
11 DIO4 I/O Digital I/O, Software Configurable
12 DIO0 - Digital I/O, Software Configurable
13 RXTX O RX/TX Switch Control; High in TX
14 - - Not Connected
15 DIO1/DCLK I/O Digital I/O, Software Configurable
16 - - Not Connected
17 DIO2/DATA I/O Digital I/O, Software Configurable
18 - - Not Connected
19 - - Not Connected
20 - - Not Connected
Table 1: MCU Connector Pin Description
The SM1231 reference design is available for download from the Semtech website, and contains the
latest schematic, PCB Gerber files and BOMs for 315 MHz, 434 MHz, 868 MHz and 915 MHz frequency
bands of operation.
The SM1231 Schematic diagram is illustrated in Figure 2.
Software drivers are available for the SX1231 and can be found in technical note TN8000.18 and source
code ("XE8000 Driving XE1200 Transceivers Standard API Definitions") available for download from the
Semtech website.
