有关数据传输系统设计的中英文翻译.docVIP

NRF905 is the Nordic company introduced single-chip RF transceiver 5 mm, working in the 433 / 868 / 915 MHz three ISM channels (free of charge). NRF905 can automatically complete the processing of prefix and CRC (cyclical redundancy check), can be done automatically on-chip hardware Manchester encoding / decoding, the use of SPI communication with a microcontroller interface, configuration is very convenient. Its very low power consumption, -10dBm output power when it was launched only 11mA current, the current in the receiving mode is 12.5mA. NRF905 non-real-time data transmission methods, namely, a data transmitter, receiver received after the first items on-chip memory, outside the MCU can chip in when necessary and then to fetch. There are two operating modes and two energy-saving modes, respectively idle mode, standby mode, ShockBurst TM receive mode and sent Shock2Burst TM mode. Several models from the outside world by controlling the CPU nRF905 the three-pin PWR_UP, TRX_CE TX_ EN and the high low to decide, PWR_UP TRX_CE TX_EN mode RF delivery mode SPI bus outside MCU configuration nRF905 through the internal registers, read and write data to their home or for standby power-down mode. NRF905 power consumption in standby mode for 40 μA in power-down mode, power consumption is 2.5 μA. nRF905 state output nRF905 a three-pin output for the state, namely: CD (Carrier Detection), AM (address matching) and DR (data ready), are high-effective. NRF905 in a receive mode, if the detected frequency of the receiver Carrier, home CD for high detection carrier then address bytes in the data, and if their address has been configured to receive the same, higher home AM; if detected receive data in the CRC check it correctly, the effective storage data byte, home to high-DR. In addition, the nRF905 there is a clock output pin uPCLK for users choose to use. By configuring the internal registers, can change its output frequency, which is useful for debugging. Wireless systems