RF and wireless data transmission system

RF and wireless data transmission system SoCnRF9E5 implementation, nRF9E5, radio, data transmission system chip - Communications Industry
51 to introduce the latest RF-compatible SoC (system on chip) nRF9E5 system framework, the various components, methods of work and configuration, wireless data transmission system of the structure and use of wireless data communication protocol nRF9E5 design, gives the hardware schematics and flowchart; summarizes the design of advanced wireless data transmission system nRF9E5.
  About NRF9E5 is NordicVLSI 2 5 February, 2004, system-level RF transmitter chip, built-in nRF905433/868/915MHz transceiver, 8051 compatible microcontroller and a 4 input 10-bit 80kSPsA / D converter, is the real SoC shown in Figure 1. Built-in transceiver nRF905 nRF905 transceiver chip operates as in ShockBurst method (prefix, address and CRC automatic processing). Built-in voltage regulator module, the maximum noise suppression, the system provides 1.9 ~ 3.6V operating voltage, QFN5 × 5mm package, the carrier detect. nRF9E5 line with the U.S. Federal Communications Commission and the European Telecommunications Standards Institute, the relevant standard. As nRF905 low-power, reliable, so it is suitable for wireless data transmission system.
1 nRF9E5 Features 1.1 nRF9E5 Hardware (1) chip micro-controller with the standard micro-controller 8051 NRF9E5 compatible with the standard 8051 instruction time is slightly different. The typical difference is: nRF9E5 chip microcontroller instruction cycle is 4 to 20 instruction cycles. Interrupt controller supports five extended interrupt sources: ADC interrupt, SPI interrupt, Radio 1, interrupt, interrupt and wake-up timer option argument interrupt. There are three controller chip, the same as the timer 8052. With a serial port 8051, you can use an asynchronous communication baud rate generator timer 1 and timer 2. In addition, expansion of the two data pointers, for reading data from the XRAM area. The data in RAM and ROM 256B microprocessor 512B. Power-on reset or software reset, the processor automatically ROM boot code. Under the guidance of the user program from EEROM 4KB of RAM loaded into a guide is usually 4KB of RAM, can be used to store data. NRF9E5 registers and 8051 the same standards, only a small number of special function registers, such as radio (small b), ADCCON, ADCDATAH, ADCDATAL, ADCSTATIC, PWMCON, PWMDUTY, RCAP2L's, RCAP2H's, CKLFCON so, most of them. In the P0, P1 and P2 port 8051 and register address is the same standard nRF9E5 0x80, 0x90, 0xA0, but the functions and 8051 standards are different.
(2) CKLF clock, RTC wake-up timer, GPIO wake-up and the WTD
NRF9E5 a low-frequency clock CKLF, the clock is always open. When the crystal began to work to the CKLF 4Hz frequency; crystal does not work, CKLF RC oscillator is a low-power devices, as long as VDD of 1.8, continuous work long hours. RTC wake-up timer, WTD (watchdog), and GPIO wake-up frequency in CKLF all the work, the chip's power consumption to ensure the completion of these tasks, the three functions. RTC wake-up timer is programmable by a 24-bit down counter control, WTD is a 16-bit programmable control down counter. WTD RTC wake-up timer and the general cycle of 80ms ~ 300 seconds, the default is 1ms. RTC wake-up timer can be GPIO output source, that is, when the RTC wake-up timer overflow occurs, the initialization time, produce a program output pulse used as GPIO.
(3) SPI interface and A / D converter
SPI (Serial Peripheral Interface) interface, MISO pin (in the SDO's EEPROM to receive data sent) when, SCK (SCK as the clock provided to the EEPROM), ramie (send data to the spatial data infrastructure EEPROM), EECSN (EEPROM of the country strategy note to send the enable signal.) The SPI of the MISO, SCK and MOSI and reuse of low-3, P1 port, the port is controlled by controlling the function of register between SPI_CTRL replaced. SPI hardware does not generate any chip select signal can be elected with the GPIO port chip. Typically, when the power system, SPI and chip 25,320 is automatically connected. When the program is loaded, the miso (port P1.2), ramie (P1.0) might be used for other purposes, such as other SPI devices or LCD module graphic.
NRF9E5 with 10-bit on-chip ADC, A / D converter reference voltage can be set between AREF and 1.22V the (internal reference voltage) software. The A / D converter, 4 inputs are software, channel select 0 to 3 pin can be converted into digital values corresponding to the voltage AIN0 ~ AIN3, channel 4 for nRF9E5 voltage monitoring. A / D conversion 10-bit default on how to work through the software in six, eight or 12-bit mode.
(4) RF transceiver NRF9E5 through an internal parallel port or an internal SPI port to communicate the same transceiver and single-chip RF transceiver nRF905 the same function of other LCD modules. Transceiver port through the parallel port or SPI communication with a microcontroller, data preparation, carrier detect and address match the chip microcontroller signals to a microcontroller and interrupts.
nRF905 work 433/868/915MHzISM band. Out of a transceiver frequency synthesizer, power amplifier, voltage regulator and the way the two receiver components. Output power, channel and other radio frequency parameters of special function registers Radio (0XA0) control program. Firing, the RF current consumption 11mA, 12.5 mA receive mode. For energy, the transceiver can be programmed on / off.
1.2 nRF9E5 transceiver nRF401 different ways and nRF903, nRF9E5 micro-controller using a wireless data transmission module and SPI interface. This RF transceiver in nRF9E5 nRF905 8051 between the core and the finished part. nRF9E5 8051 nRF905 chip RF transceiver core was completed. 8051 nRF905 RF transceiver chip nRF905 completed between the kernel. nRF9E5 transceiver work in three ways, ShockBurst the receiver (RX) mode, ShockBurst transmission (TX) mode and idle mode. When the transceiver is in idle mode, the micro-controller is still running.
NRF9E5 use NordicVLSI the ShockBurst, high-speed data transmission. The relevant agreement was signed by nRF9E5 N - chip RF data. LCD LCM