Check the listing for details. PE4302 Digital RF Attenuator Module DC-4000MHz Attenuation Digital Master Panel. Condition: New. Listed at 33.18 USD. Title： PE4302 Digital RF Attenuator Module DC-4000MHz High Attenuation Digital Master Panel 5V Module model: PE4302 Digital RF Attenuator Module Product power supply: 5V Product size: 50mmx50mm The maximum input power is: +24dBm Module instructions: When LE is set to the opposite side of ON and P/S is set to ON, the module is in program control mode; when LE is set to ON and P/S is set to the opposite side of ON, the module is in DIP control mode, and the attenuation is determined by C0.5 ~C16 six dial control, the attenuation is the sum of the dial values. For example, when you need to attenuate 20dB, you can dial C16 and C4 to the ON end. STM32 module parameter specifications: Module model: digital module driver boardModule power supply: DC5VModule current: 45mA (TYP)Module communication interface: USB2.0 (STM32 MCU comes with USB, the communication program needs to be developed by yourself)Main control chip: STM32F103RBT6Program download interface: JTAGModule system main frequency: 72MHz (MAX)Functional peripherals: 1. ADC: 8 channels (input voltage range 0-3.3V); 2. RS232 serial portModule size: 70x50x12mmModule weight: 30g Frequently Asked Questions: 1. (Q): The main control board defaults to the JTAG interface. How do I connect it to STLINK?(A): The JTAG interface contains the interface required for SWD download. You can ask Baidu for how to correspond.2.(Q): If you accidentally supply 7V and the module burns, is the microcontroller still good?(A): This is not sure whether the microcontroller is still in good condition. It is recommended to replace the power chip first. After testing the microcontroller, you can send it back for repair if it does not work.3.(Q): How to operate the digital module driver board?(A): The five-key keyboard long press the middle button to switch function, up and down are addition and subtraction numbers, and left and right are shift operations, which is a simple human-computer interaction. Package: 1*PE4302 Digital Radio Frequency Attenuator Module or 1*Digital Module Driver Board On Oct-10-21 at 22:53:12 PDT, seller added the following information: