Si4x55-C EASY-TO-USE, LOW-CURRENT OOK/(G)FSK SUB-GHZ TRANSCEIVER, TRANSMITTER, AND RECEIVER Features Frequency Max data rate = 500 kbps range = 284960 MHz Power supply = 1.8 to 3.6 V Receive sensitivity = 116 dBm TX and RX 64 byte FIFOs Modulation Automatic frequency control (AFC) (G)FSK Automatic gain control (AGC) OOK Integrated battery voltage sensor Max output power = +13 dBm Packet handling including preamble, Low active power consumption sync word detection, and CRC 10 mA RX Low BOM 18 mA TX +10 dBm 20-Pin 3x3 mm QFN package Low standby current = 40 nA Low shutdown current = 30 nA Preamble sense mode Pin Assignments 6 mA average RX current at 1.2 kbps Applications Remote control Remote keyless entry GND 1 20 19 18 17 16 nSEL Home security and alarm Home automation SDN 2 15 SDI Telemetry Industrial control Garage and gate openers Sensor networks RXp 3 14 SDO Si4455 Health monitors RXn 4 13 SCLK Description TX 5 12 nIRQ GND 6 7 8 9 10 11 GPIO1 Silicon Laboratories Si4455 is an easy-to-use, low current, sub-GHz EZRadio transceiver. The Si4055 is a transmit-only device, and the Si4355 is a receiver-only device based on the Si4x55 architecture. This data sheet covers all three products with the transmit descriptions being relevant for Si4455 and Si4055 and the receive descriptions being relevant for Si4455 Patents pending and Si4355. Covering all major bands, it combines plug-and-play simplicity with the flexibility needed to handle a wide variety of applications. The compact 3x3 mm package size combined with a low external BOM count makes the Si4x55 both space efficient and cost effective. The +13 dBm output power and excellent sensitivity of 116dBm allows for a longer operating range, while the low current consumption of 18 mA TX (at 10 dBm), 10 mA RX, and 40 nA standby, provides for superior battery life. By fully integrating all components from the antenna to the GPIO or SPI interface to the MCU, the Si4x55 makes it easy to realize this performance in an application. Design simplicity is further exemplified in the Wireless Development Suite (WDS) user interface software. WDS provides simplified programming options for a broad range of applications in an easy-to-use format that results in faster and lower risk development. The Si4x55 is capable of supporting major worldwide regulatory standards, such as FCC, ETSI, ARIB, and China regulatory standards. Rev 1.0 10/14 Copyright 2014 by Silicon Laboratories Si4x55-C VDD GPIO3 VDD GPIO2 GND XIN GPIO0 XOUTSPI Interface Controller Si4x55-C Functional Block Diagram GPIO3 GPIO2 XIN XOUT Synthesizer SDN 25-32MHz XO Rx Chain nSEL SDI RXp Rx/Tx LNA PGA ADC SDO Modem RXn SCLK nIRQ Battery TX PA Voltage Aux ADC GPIO1 Sensor VDD GPIO0 2 Rev 1.0