The ADM2483 is an isolated RS485 transceiver from ADI that integrates ADI's patented icoupler isolation technology, which is equivalent to integrating three single-channel optocouplers and one RS485 transceiver at 500Kbps. The package is SOW--16. There are several advantages and points of attention in the application:
1. Small size: Originally we used three 6N137 and one MAX485, and one DC-DC isolated power supply module to do RS485 communication interface isolation, but these only use one ADM2483 and one DC-DC isolated power supply module. Because the magnetic isolation technology is voltage type, there is no need for an external current limiting resistor, and the front end supports 3.3V/5V power supply, which greatly simplifies the circuit and improves performance.
Illustration: Transmission waveform diagram when the transceiver is high and low
2, unique power monitoring function: ADM2483 has a power monitoring foot PV, the function of this pin is power supply monitoring, when the power supply is lower than 2.0V, this pin is set low, ADM2483 does not work, when the power supply is higher than At 2.0V, this pin will automatically be set high, and the ADM2483 will work. Generally, in practical applications, it will be set high or left floating. (Note: It is better to connect a 10K pull-up resistor when setting high to prevent the current from being too large. The foot burned out), the actual circuit diagram is as follows:
(Because the signal isolation is integrated internally, the transceiver and control pins can be directly connected to the CPU)
Graphic: ADM2483 practical application circuit diagram (for reference only)
3, A, B bus terminal: ADM2483 internal integrated RS485 transceiver, with thermal shutdown and input failure protection. However, the ADM2483 does not have ESD protection function (up to 4000V in human body mode). Therefore, the bus terminal needs to be protected. The value I actually tested is that it can reach ±8 after only accessing the 6.7V TVS tube. kV contact discharge, so for some basic applications, it is good.
4. Cost: Now ADI's US dollar offer is $3.00, but we are using more than 10 yuan. Basically, it is about 16 blocks.
Adm2483 application circuitThe ADM2483 differential bus transceiver is an integrated galvanic isolation device for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E) standards. The device uses ADI's iCoupler technology to integrate 3-channel isolators, tri-state differential line drivers, and differential input receivers in a single package. The logic side of the device can be powered from a 5 V or 3 V supply and the bus terminal is powered from a 5 V supply.
Typical circuit:
ADM2483 Features: Integrated RS-485 Transceiver with Electrical Data Isolation; High Common Mode Transient Immunity: 》25 kV/μs; Thermal Shutdown Protection; Low Power Operation: 2.5 mA Max
Typical application range of ADM2483: isolated interface; building control network; multi-point data transmission system
ADM2483 reference design application circuit:
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