RFM31B RFM31B ISM RECEIVER V1.0 Features Frequency Range Programmable GPIOs 433/868/915MHz ISM bands Embedded antenna diversity algorithm Sensitivity = 121 dBm Configurable packet handler Low Power Consumption Preamble detector 18.5 mA receive RX 64 byte FIFO Data Rate = 0.123 to 256 kbps Low battery detector FSK, GFSK, and OOK modulation Temperature sensor and 8-bit ADC Power Supply = 1.8 to 3.6 V 40 to +85 C temperature range Ultra low power shutdown mode Integrated voltage regulators Digital RSSI Frequency hopping capability Wake-up timer On-chip crystal tuning Auto-frequency calibration (AFC) 14-PIN DIP & 16-PIN SMD package Clear channel RX BW 2.6620 kHz RFM31B Low BOM Programmable assessment Power-on-reset (POR) Programmable packet handler Applications Remote control Remote meter reading Home security & alarm Remote keyless entry Telemetry Home automation Personal data logging Industrial control Toy control Sensor networks Tire pressure monitoring Health monitors Wireless PC peripherals Tag readers Description are highly integrated, low cost,433/868/915MHZ wireless HopeRF s RFM31B (121dBm) ensures ISM receiver module. The low receive sensitivity extended range and improved link performance. Built-in antenna diversity used to further extend range and and support for frequency hopping can be enhance performance. Additional system features such as an automatic wake-up timer, low battery detector, 64 byte RX FIFO, automatic packet handling, and preamble detection reduce overall current consumption and allow the use of a lower-cost system MCU. An integrated temperature sensor, general purpose ADC, power-on-reset (POR), and GPIOs further reduce overall system cost and size. The RFM31B s digital receive architecture features a high-performance ADC and DSP based modem which performs demodulation, filtering, and packet handling for increased flexibility and performance. An easy-to-use calculator is provided to quickly configure the radio settings, simplifying customer s system design and reducing time to market. Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales hoperf.com RFM31B TABLE OF CONTENTS Section Page 1. Electrical Specifications 4 2. Functional Description . 10 2.1. Operating Modes 11 3. Controller Interface 12 3.1. Serial Peripheral Interface (SPI) 12 3.2. Operating Mode Control 14 3.3. Interrupts .17 3.4. System Timing .18 3.5. Frequency Control .19 4. Modulation Options 24 4.1. FIFO Mode 24 5. Internal Functional Blocks 25 5.1. RX LNA .25 5.2. RX I-Q Mixer .25 5.3. Programmable Gain Amplifier 25 5.4. ADC 25 5.5. Digital Modem 25 5.6. Synthesizer 26 5.7. Crystal Oscillator 27 5.8. Regulators .27 6. Data Handling and Packet Handler 28 6.1. RX FIFO 28 6.2. Packet Configuration .29 6.3. Packet Handler RX Mode .29 6.4. Data Whitening, Manchester Encoding, and CRC 32 6.5. Preamble Detector 32 6.6. Preamble Length 33 6.7. Invalid Preamble Detector .33 6.8. Synchronization Word Configuration .33 6.9. Receive Header Check .34 7. RX Modem Configuration . 35 7.1. Modem Settings for FSK and GFSK .35 8. Auxiliary Functions 36 8.1. Smart Reset .36 8.2. Microcontroller Clock .37 8.3. General Purpose ADC .38 8.4. Temperature Sensor .39 8.5. Low Battery Detector .41 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales hoperf.com