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Design and realization of remote control unit for ESC antenna based on AISG2.0 protocol

Design and realization of remote control unit for ESC antenna based on AISG2.0 protocol


The ESC Antenna Remote Control Unit (RCU) is the core component for antenna downtilt adjustment and remote real-time monitoring of antenna status.

Starting from the practical application, this paper expounds the hardware design of RCU and the realization of related software modules, and briefly summarizes the problems that are easily overlooked in the process of docking between RCU and base station.

The AISG communication interface circuit in this system is shown in Figure 2. Since the antennas are generally distributed in relatively high and open areas, the lightning protection function of the RCU communication interface is essential.

The lightning protection part of the communication interface circuit includes three parts: gas discharge tube, PTC and TVS. The gas discharge tube constitutes the first line of lightning protection, and PTC and TVS serve as the second line of defense, which further ensures the lightning protection performance of the communication interface.

Considering that all RET controllers are hung in the air, and finally connected to the ground through a single point of the base station, there is no ground potential difference, so a non-isolated solution is adopted.

Motor Control Module


The core of the motor control driver module is Allegro's stepping motor driver chip A3977. The chip has 1/2, 1/4 and 1/8 microstepping modes.

In this system, through software configuration, MS1 is high level, MS2 is low level, the motor works in half-step mode, and the motor rotates one circle every time the MCU sends 400 pulses.

The A3977 output driver has a capacity of 35 V, 2.5 A, and internally includes - a fixed downtime current regulator that can operate in low, fast or mixed decay modes, which can effectively reduce motor noise and increase stepping accuracy and reduce power dissipation.


Storage module


The storage module mainly includes antenna-related parameter storage and RCU firmware storage.

Antenna parameter storage adopts ferroelectric memory FM24LC16, including product serial number, antenna parameters, antenna configuration data and phase shifter configuration data.

The main reasons for choosing ferroelectric memory are: AISG protocol stipulates that after receiving the command from the base station, the RCU must send a response frame within 10 ms, otherwise the communication is considered to be timed out, which requires the command to write the antenna parameters into the memory It must be completed within 10 ms; considering the time consumption of executing the program, in the case of a large amount of antenna data, ordinary EEPROM cannot meet the requirements; compared with EEPROM, ferroelectric memory has a faster writing speed, and the writing process does not need to wait. meet this requirement.

The RCU firmware storage uses the internal Flash of the μPSD microcontroller. Using the unique Flash structure inside the μPSD MCU, both the executing firmware and the updated firmware are stored in the on-chip Flash of the MCU, thus eliminating the need for external memory, saving the BOM cost, and improving the reliability and safety of the product. sex.

Power module

The AISG2.0 protocol stipulates that the supply voltage range is 10 V~30 V.

Since the ESC antenna phase shifter needs a large torque in this design, a stepper motor with a power supply voltage of 12V is selected, which poses a challenge to the system power supply, that is, when the power supply voltage is higher than 12V, it needs to be stepped down. When the supply voltage is lower than 12 V, the power supply circuit needs to be boosted.

This design adopts the circuit structure of first step-down and then step-up. The input voltage is first lowered to 8V, and then boosted to 12V to supply power for the stepper motor. The system power supply is converted from 8 V to 3.3 V through an LDO.
Premier Cable make a lot of AISG Cable, AISG RET Cable,  Remote control unit cable


You can see the products details from below link ,

If you need product details, drawings, and samples, you can use below contact info : 

Skype : James198585 

Wechat : 13929497934


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