Introduction; Figure 1: Sm1231 Application Schematic - Semtech SX1231SKB User Manual

SX1231-31SKB
USER GUIDE

1 Introduction

The SX1231 is a single-chip integrated circuit ideally suited for today's high performance ISM band RF
applications. The advanced feature set, including state of the art packet engine greatly simplifies system
design whilst the high level of integration reduces the external BOM to a handful of passive decoupling
and matching components. It is intended for use as high-performance, low-cost FSK and OOK RF
transceiver for robust frequency agile, half-duplex bi-directional RF links, and where stable and constant
RF performance is required over the full operating range of the device down to 1.8V.
The SX1231 is intended for applications over a wide frequency range, including the 433 MHz and 868
MHz European and the 902-928 MHz North American ISM bands. Coupled with a link budget in excess of
135 dB, the advanced system features of the SX1231 include a 66 byte TX/RX FIFO, configurable
automatic packet handler, listen mode, temperature sensor and configurable DIOs which greatly enhance
system flexibility whilst at the same time significantly reducing MCU requirements.
The SX1231 complies with both ETSI and FCC regulatory requirements and is available in a 5x5 mm
QFN 24 lead package
The SX1231-31SKB is a USB based evaluation tool designed to allow simple and easy evaluation of the
suitability of the SX1231 for a given application. The low component count reference design implemented
in the SM1231 reference design is illustrated below in Figure 1.

Figure 1: SM1231 Application Schematic

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