XL7108-SMT using amiccom (amiccom) in July 2011: a new generation of application in smart grid RF chip, module design in Europe, America and Asia common 433.92mhz, support of smart grid in China, the choice of 470MHz ~ includes, as well as the European wireless automatic reading table used 868.3MHz and 868.95MHz band. In addition, a7108 also support below 1GHz free license ISM band applications (300MHz ~ 950mhz), such as Japanese 310MHz, of Taiwan and the United States allowed 915MHz and band. However, such as the work of these channels, the module needs to modify the parameters, the specific contact with my company's business personnel. Belonging to the a7108 amiccom fourth generation high performance chip, the data rate support 2kbps ~ 250kbps, modulation can select FSK / GFSK, MCU through the SPI interface and can be operated a7108 RF mode, and access to the construction of 64 bytes TXFIFO and RXFIFO.
A7108's greatest advantage lies in super high quality RF performance, in order to 510MHz ~ 410MHz band, built in the PA can output up to 20dBm of the transmit power, the receiver has super high sensitivity (-114dBm @ 10Kbps). Under the conditions of XL7108-D01, 10Kbps with a vertical single heart line antenna (cut 1/4 wavelength length of 1.6mm single core line), measured in the open area of the sea can be 1300 meters, the distance measured 1000 meters. If the rate data from 10Kbps down to 2Kbps, the open area measured distance increased to 1600 meters.
In addition to the long-distance transmission capability, built-in a7108 RSSI can assist software engineers detection clean transmission channel, inside the chip of auto calibration mechanism, variation of semiconductor process to overcome, work stably in various environments, the function of automatic frequency compensation (AFC) can be in dealing with the recession caused by the RF frequency offset sensitivity. In the data processing, A7108 provides direct mode (mode Direct) and FIFO mode. The direct mode is suitable for MCU to choose its own packet format, while the FIFO mode uses the TXFIFO packet format (including FEC, CRC and Manchester code).
