FC-703C Wireless M-bus Module DATA SHEET FRIENDCOM TECHNOLOGY DEVELOPMENT CO.,LTD Address: Comprehensive building, Wanyelong science and technology Park, Liyuan Industrial Zone, Shiyan Street, Bao'an District, Shenzhen City 518108 P.R.CHINA. Tel: +86-755- 23230544-8083 Fax: +86-755-86026300 E-mail: technical@friendcom.com Website: http://www.friendcom.cn
TABLE OF CONTENTS FC-703C Wireless M-bus Module Data Sheet Ⅰ. Brief Description... 2 Ⅱ. Technical Specification... 2 Ⅲ. Pin Assignment and Description... 3 Ⅳ. Typical Connection Circuits... 4 Ⅴ. Typical Application Description... 5 Page 1
Ⅰ. Brief Description FC-703C RF transceiver module follows the EN13757-4 protocol.the module adopts low-power and wireless SOC Si1000 Series MCU from silicon labs. It has a UART interface for serial communication and configuration. The dimension is 13.7x25.4x3.4mm.FC-703C can work in S, T, R2 and C mode. It works in sleeping mode with super-low consumption power and be wakened up via serial port. By mounting the module onto the user board,it is easy to use through serial port communication protocol. Main Applications AMR/AMI Electricity meters Gas and Water meters Heat meters, Heat cost allocators Handheld device and gateways In-Home Display and wireless sensor Key Features Embedded Wireless M-Bus protocol supporting EN 13757-4:2011 mode S, T,R2 and C. Easy to use UART interface for communication and configuration Wide supply voltage range, 2.2 3.6 V Ultra low power modes for longer battery lifetime Conforms with EU R&TTE directive (EN 300 220, EN 301 489, EN 60950) Function Description FC-703C wireless M-bus module supports S, T, R2 and C modes. It can be configured as master, slave and repeater. Please refer to the FC-703C User Manual for the detailed function description. Ⅱ. Technical Specification Table 1: Technical Specification Item Min Typ. Max Unit Frequency bands 868 870 MHz Number of channels 12 Supply voltage VCC 2.0 3.3 3.6 VDC Voltage on any pin VCC-0.7 VCC VDC TX Current (RF_POWER=5 10dbm) 40 ma RX/IDLE Current 24 ma Sleep Current 2.8 ua Input/output impedance 50 Ohm RF Data rate 4.8 32.768 kchip/s 100 Max RF output power(vcc=3.3v) 10 dbm Sensitivity, 32.768K -102 dbm Page 2
Spurious emission, TX -36 < 1 GHz dbm -30 > 1 GHz Sensitivity(32.768K) -102 dbm Blocking 1 MHz 4 MHz 8 MHz 52 56 63 dbm Image Rejection 30 dbm Spurious Emissions -54 dbm Harmonics 42 dbm Minimum RST Low Time to Generate a System Reset 15 μs Operating temperature -40 80 C Storage temperature -50 150 C Weight 5 g Notes: 1. Frequency band and data rate comply with the EN13757-4 protocol. 2. A stable power supply is required to assure the module to work stably, or error may occur. Ⅲ. Pin Assignment and Description Pin Assignment: Fig.1. Pin Assignment Page 3
Table 2: Pin Description: Pin Name Describe 1 Ground 2-7 RESERVED For test and future extension, not connected 8 RTS Receive flow control I, output, high: idle, low: busy. 9 CTS Send flow control O, input high: idle, low: busy 10 RESERVED For test and future extension, not connected 11 CONFIG Reserved 12 Ground 13 Ground 14 VCC POWER SUPPLY 15 Ground 16 Ground 17 RF RF pin, connect with antenna 18 Ground 19 Ground 20-24 RESERVED For test and future extension, not connected 25 LED1 LED1 output. If not needed, not connected. Active high. 26 LED2 LED2 output. If not needed, not connected. Active high. 27 RXD Serial RX 28 TXD Serial TX 29 RESET Reset Pin (active in low) 30 Ground Ⅳ. Typical Connection Circuits 2.0-3.6V Antenna VCC RESTET NC RF RXD TXD CONFIG CTS RTS Fig.2. Connection with User Circuit RXD: data receiving of serial port TXD: data transmitting of serial port RTS: flow control optional CTS: flow control optional Page 4
Reset Circuit The reset circuit is shown as below: VCC RS232, RS485, USB TXD RXD VCC RESET 1nF 200Ω Connect to supervisory circuit or MCU I/O-pin Fig.3. Reset Circuit To minimize effect of noise on the Reset-line, the Reset pin on the module must be connected to external circuitry via an RC-network. It is recommended to connect Reset pin to either a supervisory circuit or a microcontroller I/O-pin. Antenna Connection The antenna should be connected to the RF pin which is matched with 50 Ohm impedance. The antenna can be chosen based on customer s needs. We provide technical support on the choice of antenna. Ⅴ. Typical Application Description The FC-703C can be embedded into various base meters such as water, gas and heat meters via UART interface. It can communicate with the remote FC-703C module connected to the gateway, computers or any other meter reading system via UART interface (hardware USB interface). FC-703C can operate in a low-power mode. It is widely used in battery-powered metering system. Fig.4. Typical Application Diagram Page 5