First, LMX2572 chip introduction
Second, the module indicators
1, the power supply voltage: +5V/80mA (LMX2572 core board) low power consumption2, the output frequency: 12.5HZ-6.4GHZ3, the default delivery mode, support amplitude and frequency adjustable4, the output amplitude control word 0-63 (under 50 ohm impedance) specific reference amplitude correspondence table5, the hardware supports external clock input, reserve FSK and other interfaces6, provide reference code (frequency synthesizer) and PDF format schematic for secondary developmentThird, the physical map3.1 core board physical map
set 2:3.2 LMX2572 core board + STC15W microcontroller + 0.96 inch OLED physical map
set 3:3.2 LMX2572 core board + STC32 main control board + 1.3 inch TFT physical map
Fourth, serial communication (STC microcontroller main control board support, STM32 main control board is not supported)The overall structure of the protocol adopts the command line mode. The communication baud rate is 9600 bps. The local machine parses and executes, and then returns the result. The command is limited to lowercase letters a~z, numbers 0~9, and the end symbol of each command is . (hexadecimal is 0x23), the total length of the command is up to 15 characters (including ).First, w command (write data to the main control board)1, wf command: set the frequency value 1 (starting frequency or point frequency)The format is: wfxxxxxxx, a total of 9 bytes;Where xxxxxxx is the frequency value represented by 7 digits, such as:Wf0000000 indicates that the set frequency is 10000000kHz (1GHz);2, wp command: set the amplitude value (amplitude value)The format is: wpx, a total of 4 bytes;Where xx is 2 digits representing the amplitude control word, no dimension:Wp00 The output amplitude is the smallest, about -60DBMWp63 The output amplitude is the largest, about 6DBMSecond, the host sends data to the host computer (response value)Return OK$ after receiving the correct data
V. Output amplitude and amplitude control word correspondence table