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HCPL-0720 Datasheet(PDF) 19 Page - Broadcom Corporation. |
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HCPL-0720 Datasheet(HTML) 19 Page - Broadcom Corporation. |
19 / 21 page Broadcom AV02-0876EN 19 HCPL-0720, HCPL-7720, HCPL-0721, and HCPL-7721 Data Sheet 40-ns Propagation Delay, CMOS Optocoupler Implementing PROFIBUS with the HCPL-772X/072X An acronym for Process Fieldbus, PROFIBUS is essentially a twisted-pair serial link very similar to RS-485 capable of achieving high-speed communication up to 12 MBd. As shown in Figure 18, a PROFIBUS Controller (PBC) establishes the connection of a field automation unit (control or central processing station) or a field device to the transmission medium. The PBC consists of the line transceiver, optical isolation, frame character transmitter/receiver (UART), and the FDL/APP processor with the interface to the PROFIBUS user. Figure 18: PROFIBUS Controller (PBC) The recommended PROFIBUS application circuit is shown in Figure 19. Since the HCPL-772X/072X are fully compatible with CMOS logic level signals, the optocoupler is connected directly to the transceiver. Two bypass capacitors (with values between 0.01 μF and 0.1 μF) are required and should be located as close as possible to the input and output power-supply pins of the HCPL-772X/072X. The bypass capacitors are required because of the high-speed digital nature of the signals inside the optocoupler. Being very similar to multistation RS485 systems, the HCPL-061N optocoupler provides a transmit disable function which is necessary to make the bus free after each master/slave transmission cycle. Specifically, the HCPL-061N disables the transmitter of the line driver by putting it into a high state mode. In addition, the HCPL-061N switches the RX/TX driver IC into the listen mode. The HCPL-061N offers HCMOS compatibility and the high CMR performance (1 kV/μs at VCM = 1000V) essential in industrial communication interfaces. PROFIBUS USER: CONTROL STATION (CENTRAL PROCESSING) OR FIELD DEVICE USER INTERFACE FDL/APP PROCESSOR TRANSCEIVER OPTICAL ISOLATION UART PBC MEDIUM |
Similar Part No. - HCPL-0720 |
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Similar Description - HCPL-0720 |
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