Avago Technologies ACPL-7210-00RE User Manual

EVBD-ACSL-7210 PROFIBUS / SPI Evaluation Board

5

ACSL-7210 Dual-Channel (Bidirectional) 25 MBd
CMOS Buered Input Digital Optocoupler

User Guide

Product Description

Avago’s ACSL-7210 optocoupler utilizes the latest CMOS
IC technology to achieve outstanding speed and low
power performance of minimum 25 MBd data rate.

Available in SO-8 package, the basic building blocks of
each channel in ACSL-7210 are a CMOS LED driver IC, a
high speed LED and a CMOS detector IC. A CMOS logic
input signal controls the LED driver IC, which supplies cur­rent to the LED. The detector IC incorporates an integrated
photodiode, a high speed trans-impedance amplier, and
a voltage comparator with an output driver.

Functional Diagram

8

VDD

1

1

2

VO

A

VI

3

B

4

GND

1

Shield

ACSL-7210

TRUTH TABLE (POSITIVE LOGIC)

Input side

VDD state

Power

Supplied

No Power Power

Output side

VDD state V

Power

Supplied

Supplied

VDD

2

7

VI

A

VO

6

B

GND

2

I

HIGH OFF HIGH

LOW ON LOW

X OFF HIGH

LED V

O

Features

• Dual-Channel (Opposite direction orientation)

• 3.3 V and 5 V CMOS Compatibility

• High Speed: DC to 25 MBd

• CMOS output and buer input

• Operating temperature: –40°C to +105°C

• Safety and Regulatory Approvals:

- UL 1577 – 3750 Vrms for 1 minute

- IEC/EN/DIN EN 60747-5-5

About the Evaluation Board

The ACSL-7210 PROFIBUS / SPI evaluation board is con­gurable for either PROFIBUS (RS-485) or SPI communica­tion. The board will accept both 3.3V and 5V power sup­plies.

When congured for PROFIBUS communication, the
ACSL-7210 bi-directional optocoupler provides isolation
for both the transmitting and receiving channels. Isolation
for the Tx Enable signal is provided by the ACPL-M61L, ul­tra low power 10MBd CMOS digital optocoupler. A stan­dard RS-485 transceiver (max. data rate of 20Mbps) is in­cluded on the board.

For SPI interface, the ACSL-7210 is used for serial data in/
out isolation. Isolation for the clock signal is provided by
ACPL-077L, low power 25MBd CMOS digital optocoupler.

Figures 1 and 2 shows the jumper settings for PROFIBUS
and SPI operation. Figure 3 shows the schematic diagram
of the evaluation board.

Board Connection and Operation

PROFIBUS Operation (Refer to Figure 1)

1. Short i) lower 2 pins of J1, ii) lower 2 pins of J4, and iii) upper 2 pins of J5.

2. The jumpers on J2 and J3 should be connected.

3. Connect a 3.3/5V power supply to VDD1 and GND1.

4. Connect a 3.3/5V power supply to VDD2 and GND2.

5. Connect the RS-485 dierential lines to SMA connectors +(485) and –(485).

6. Connect SMA connectors TX_EN(485), TX(485) and Rx(485) to microcontroller.

Short lower

2 pins of J1

Short lower 2 pins of J4,

and upper 2 pins of J5

Figure 1. Conguration for PROFIBUS (RS-485) Operation

2

Jumpers on J2 and J3
should be connected.