ANALOG DEVICES ADUM1250 Service Manual
ADuM1250/ADuM1251
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V
DD1
SDA
1
SCL
1
GND
1
V
DD2
SDA
2
SCL
2
GND
2
1
2
3
4
8
7
6
5
06113-001
ENCODE DECODE
ENCODE DECODE
DECODE ENCODE
V
DD1
SDA
1
SCL
1
GND
1
V
DD2
SDA
2
SCL
2
GND
2
1
2
3
4
8
7
6
5
06113-002
FEATURES
Bidirectional I2C communication
Open-drain interfaces
Suitable for hot swap applications
30 mA current sink capability
1000 kHz operation
3.0 V to 5.5 V supply/logic levels
8-lead SOIC RoHS-compliant package
High temperature operation: 125°C
Qualified for automotive applications
Safety and regulatory approvals
UL recognition
2500 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
V
= 560 V peak
IORM
APPLICATIONS
Isolated I2C, SMBus, or PMBus interfaces
Multilevel I
Power supplies
Networking
Power-over-Ethernet
Hybrid electric vehicle battery management
2
C interfaces
Hot Swappable, Dual I2C Isolators
FUNCTIONAL BLOCK DIAGRAMS
Figure 1. ADuM1250
Figure 2. ADuM1251
GENERAL DESCRIPTION
The ADuM1250/ADuM12511 are hot swappable digital isolators
with nonlatching, bidirectional communication channels
compatible with I
splitting I
2
2
C signals into separate transmit and receive signals
C® interfaces. This eliminates the need for
for use with standalone optocouplers.
The ADuM1250 provides two bidirectional channels, supporting a
complete isolated I
2
C interface. The ADuM1251 provides one
bidirectional channel and one unidirectional channel for those
applications where a bidirectional clock is not required.
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. D
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license i s granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Information furnishe d by Analog Devices is be lieved to be accurate and reliable. However, no
Both the ADuM1250 and ADuM1251 contain hot swap circuitry
to prevent glitching data when an unpowered card is inserted
onto an active bus.
These isolators are based on iCoupler® chip scale transformer
technology from Analog Devices, Inc. iCoupler is a magnetic
isolation technology with functional, performance, size, and
power consumption advantages as compared to optocouplers.
With the ADuM1250/ADuM1251, iCoupler channels can be
integrated with semiconductor circuitry, which enables a
complete isolated I
2
C interface to be implemented in a small
form fa c tor.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113 ©2006–2011 Analog Devices, Inc. All rights reserved.
www.analog.com
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