Analog Devices: CN0158 Reference Design for Universal Serial Bus Hub Isolator Circuit

atomar — Sun, 27 Oct 2013 05:58:20 GMT

Current Revision posted to Documents by atomar on 10/27/2013 5:58:20 AM

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Kit Overview

The universal serial bus is rapidly becoming the standard interface for most PC peripherals. It is displacing RS-232RS-232 and the parallel printer port because of superior speed, flexibility, and support of device hot swap. There has been a strong desire on the part of industrial and medical equipment manufacturers to use the bus as well, but adoption has been slow because there has not been a good way to provide the isolation required for connections to machines that control dangerous voltages or low leakage defibrillation proof connections in medical applications.

The goal of the application circuit (EVAL-CN0158-EB1ZEVAL-CN0158-EB1Z) is to isolate a hub as if it were a full speed peripheral device. The hub or host function requires that 2.5 W of power be available to each downstream port. Power to run the downstream side of the isolator and power the hub and ports is provided as part of the solution.

In this USB Hub Isolator Circuit (EVAL-CN0158-EB1ZEVAL-CN0158-EB1Z), the ADuM4160ADuM4160 is designed primarily as an isolation element for a peripheral USB device. However, there are occasions when it is useful to isolate a host device. Several issues must be addressed to use the ADUM4160BRWZ.ADUM4160BRWZ. for this application. Whereas the buffers on the upstream and downstream sides of the ADuM4160 are the same and capable of driving a USB cable, the downstream buffers must be capable of adjusting speed to a full or low speed peripheral that is connected to it.

Unlike the case of building a dedicated peripheral interface where the speed is known and not changed, host applications must adapt. The ADuM4160ADuM4160 is intended to be hardwired to a single speed via pins; therefore, it works when the peripheral plugged into its downstream side is the correct speed, but it fails when the wrong speed peripheral is attached. The best way to address this is to combine the ADUM4160BRWZ.ADUM4160BRWZ. with a hub controller.

The upstream side of a hub controller can be thought of as a standard fixed speed peripheral port that can be easily isolated with the ADuM4160ADuM4160, whereas the speed of the downstream ports is handled by the hub controller. The hub controller converts peripherals of different speeds to match the upstream port speed.

Key Applications: Medical and industrial applications

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Development Tools

USB port hub connection with an upstream-downstream data path
ADUM4160BRWZ.ADUM4160BRWZ. isolated USB hub (EVAL-CN0158-EB1ZEVAL-CN0158-EB1Z)
ADuM4160 evaluation board (EVAL-ADUM4160EBZEVAL-ADUM4160EBZ)
Three USB cables
A high speed digital oscilloscope

Technical Documents

Learning Center

Type	Description
User Manual	ADI: User Manual (CN-0158) for Universal Serial Bus (USB) Hub Isolator Circuit
User Manual	ADI: User Guide for iCoupler ADuM4160 USB Isolator Evaluation Board
Datasheet	ADI: Datasheet for ADP3330 High Accuracy Ultralow I(Q), 200 mA, SOT-23, anyCAP Low Dropout Regulator (Rev A)
Datasheet	ADI: Datasheet for ADP3339 High-Accuracy Ultralow IQ, 1.5 A, anyCAP Low Dropout Regulator (Rev C)
Datasheet	ADI: Datasheet for ADuM4160 Full/Low Speed 5 kV USB Digital Isolator (Rev D)
Selection Guide	ADI: Selection Guide for Digital Isolator Products
Application Note	ADI: Application Note (AN-740) for iCoupler Isolation in RS-232 Applications
Application Note	ADI: Application Note (AN-770) for iCoupler Isolation in CAN Bus Applications
Application Note	ADI: Application Note (AN-727) for iCoupler Isolation in RS-485 Applications

Design Elements

Type	Description
Layout	ADI: Layout File for EVAL-CN0158-EB1Z
BOM	ADI: BOM File for EVAL-CN0158-EB1Z Evaluation Board
Simulation Model	ADI: IBIS Model for ADuM4160 (All Speed Grades)

Video

www.youtube.com/watch

Kit Features

The ADUM4160BRWZ.ADUM4160BRWZ. combines with an SMSC USB2512 two-port USB hub controller for
- directly isolating, in the upstream, the USB D+ and D− lines of a hub chip, allowing the hub to manage the downstream host port activity
- implementing an automatic scheme for data flow of control that does not require external control lines.
- providing medical grade isolation
- allowing creation of one or more host ports that meet the USB-IF certification standards.
Supporting flexible power configurations
Full featured, supporting channel by channel current limiting through a MIC2026-1BMMIC2026-1BM power distribution switch and sufficient offline regulated power to provide 2.5 W to each downstream channel
Support peripheral devices running at one of three speeds, low (1.5 Mbps), full (12 Mbps), and high (480 Mbps
The peripherals downstream require full cable power to operate

Devices Used for the EVAL-CN0158-EB1ZEVAL-CN0158-EB1Z Evaluation Board

Features of ADuM4160ADuM4160 USB Digital Isolator:

USB 2.0 compatible
Low and full speed data rate: 1.5 Mbps and 12 Mbps
Bidirectional communication
4.5 V to 5.5 V VBUS operation
- 7 mA maximum upstream supply current @ 1.5 Mbps
- 8 mA maximum upstream supply current @ 12 Mbps
- 2.3 mA maximum upstream idle current
Upstream short-circuit protection
Class 3A contact ESD performance per ANSI/ESD STM5.1-2007
High temperature operation: 105°C
High common-mode transient immunity: >25 kV/μs
16-lead SOIC wide-body package version
16-lead SOIC wide body enhanced creepage version
RoHS compliant
Safety and regulatory approvals (RI-16 package)
- UL recognition: 5000 V rms for 1 minute per UL 1577
- CSA Component Acceptance Notice #5A
  - IEC 60601-1: 250 V rms (reinforced)
  - IEC 60950-1: 400 V rms (reinforced)
- VDE Certificate of Conformity
  - DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
  - VIORM = 846 V peak

Features of ADP3339ADP3339 ANYCAP® Low Dropout Regulator:

High accuracy over line and load: ±0.9% at 25°C, ±1.5% over temperature
Ultralow dropout voltage: 230 mV (typical) at 1.5 A
Requires only COUT = 1.0 μF for stability
anyCAP = stable with any type of capacitor (including MLCC)
Current and thermal limiting
Low noise
2.8 V to 6 V input voltage range
−40°C to +85°C ambient temperature range
SOT-223 package

Features of ADP3330ADP3330 ANYCAP® Low Dropout Regulator:

High Accuracy Over Line and Load: 60.7% @ +258C,
61.4% Over Temperature
Ultralow Dropout Voltage: 140 mV (Typ) @ 200 mA
Requires Only CO = 0.47 mF for Stability
anyCAP = Stable with Any Type of Capacitor
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: <2 mA
2.9 V to 12 V Supply Range
Ultrasmall Thermally Enhanced Chip-on-Lead™
–408C to +858C Ambient Temperature Range
SOT-23-6 6-Lead Package

Kit Contents

The Anaog Devices EVAL-CN0158-EB1ZEVAL-CN0158-EB1Z supplied with below contents:

Evaluation Board

Tags: cn0158, eval-cn0158-eb1z, adum4160, evaluation_board, analog_devices