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MAXREFDES1160: Full-duplex, 500kbps and 2.75kVRMS Isolated RS-485 Module Using the MAX14853

MAXREFDES1160

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Description

The MAXREFDES1160 is a 5V supplied, 2.75kVRMS, full-duplex and 500kbps isolated RS-485 module using the MAX14853. This reference design demonstrates how to build an isolated RS-485 module with a low-cost transformer to provide isolated power. A transformer from HanRun, the HR600755, is used in this design. The power supply on the reference design is derived from a single 5V source. Connect the design board to a USB port or connect an external supply from VDDA to GNDA to provide 5V power supply on the logic side (A). The integrated push-pull transformer driver and external transformer (TX1) generate an isolated supply for powering the isolated side (B) of the board.

The MAX14853 isolated RS-485/RS-422 transceiver provides 2750VRMS (60s) of galvanic isolation between the cable-side (RS-485/RS-422 driver/receiver-side) and the UART-side of the module. This device allows for robust communication up to 500kbps. The MAX14853 includes an integrated 450kHz transformer driver for power transfer to the cable-side of the transceiver using an external transformer. An integrated LDO provides a simple and space-efficient architecture for providing power to the cable-side of the IC. The MAX14853 includes one drive channel and one receive channel. The receiver is ¼-unit load, allowing up to 128 transceivers on a common bus. Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when cable-side or UART-side power supplies are below functional levels. The driver outputs and receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable-side, as specified by the Human Body Model (HBM).

The MAXREFDES1160 is a 5V supplied, 2.75kV<sub>RMS</sub>, full-duplex and 500kbps isolated RS-485 module using the MAX14853.

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Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Schematic

PCB Layout

Test Results

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX14853 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection and Integrated Transformer Driver Transceivers Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Transceivers
2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection and Integrated Transformer Driver

Design Files (4)

Title Type Size Date
maxrefdes1160-schematic PDF 21KB 2019-05-08
maxrefdes1160-bom PDF 90KB 2019-05-08
maxrefdes1160-pcb PDF 2MB 2019-05-08
MAXREFDES1160 Design Verification Testing PDF 162KB 2019-05-08
Date Type
2019-05-08

maxrefdes1160-schematic

(PDF, 21KB)

2019-05-08

maxrefdes1160-bom

(PDF, 90KB)

2019-05-08

maxrefdes1160-pcb

(PDF, 2MB)

2019-05-08

MAXREFDES1160 Design Verification Testing

(PDF, 162KB)

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