EZLINX-IIIDE-EBZ datasheet(6/15 Pages) AD

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Coupler® Isolated Interface

Development Environment

ezLINX™

Hardware User Guide

Rev. PrA | Page 6 of 15

ISOLATED RS-232

The Isolated RS-232 port is implemented using the ADM3252E

Signal and Power isolated RS-232 transceiver. The ADM3252E

connects to UART3 of the ADSP-BF548 and is capable of

functioning at data rates of up to 460kbit/s. Figure 6 shows a

circuit diagram of the implementation of the ADM3252E on the

LINX hardware.

The Isolated RS-232 JP2 jumper when fitted will implement a

loopback of the transmitter output(TOUT1) to the receiver

input(RIN1).

The VCC of the ADM3252E is powered with 3.3V and will

generate an isolated 3.3V on VISO using ADI’s isoPower

technology.

A three pin screw terminal connector, J6 is used for easy access

to the TOUT1(pin 2), RIN1(pin 3) and RS232_ISO_GND(Pin

1) connections.

Figure 6. ADM3252E Isolated RS-232 Implementation

ISOLATED I2C

The Isolated I2C port is implemented using the ADuM1250 I2C

Isolator and ADuM5000 isoPower Isolated DC to DC converter.

The ADuM1250 connects to TW1 of the ADSP-BF548 and is

capable of functioning at a maximum frequency of 1MHz.

Figure 7 shows a circuit diagram of the implementation of the

ADuM1250 and ADuM5000 on the ezLINX hardware.

VDD1 of the ADuM1250 and VDD1 of the ADuM5000 is powered

by 3.3V. The ADuM5000 will generate an isolated 3.3V and is

used to supply power to VDD2 of the ADuM1250.

A three pin screw terminal connector, J22 is used for easy access

to the SDA(Pin 1), SCL(Pin 2) and I2C_ISO_GND(Pin 3)

connections.

EZLINX-IIIDE-EBZ Fiches technique(PDF) 6 Page - Analog Devices