Hot Swappable, Dual I2C Isolators
Data Sheet
ADuM1250/ADuM1251
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
Bidirectional I2C communication
Open-drain interfaces
DECODE
ENCODE
DECODE
ENCODE
ENCODE
DECODE
ENCODE
DECODE
8
7
6
5
V
V
DD2
1
2
3
4
DD1
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, RoHS-compliant SOIC package
High temperature operation: 125°C
Qualified for automotive applications
Safety and regulatory approvals
UL recognition
SDA
SCL
GND
SDA
SCL
1
1
1
2
2
GND
2
Figure 1. ADuM1250
8
7
6
5
V
DECODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
V
DD2
1
2
3
4
DD1
2500 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE certificate of conformity
SDA
SDA
1
1
1
2
SCL
SCL
2
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
V
IORM = 560 V peak
GND
GND
2
APPLICATIONS
Figure 2. ADuM1251
Isolated I2C, SMBus, or PMBus interfaces
Multilevel I2C interfaces
Power supplies
Networking
Power-over-Ethernet
Hybrid electric vehicle battery management
GENERAL DESCRIPTION
The ADuM1250/ADuM12511 are hot swappable digital isolators
with nonlatching, bidirectional communication channels that
are compatible with I2C interfaces. This eliminates the need for
splitting I2C signals into separate transmit and receive signals
for use with standalone optocouplers.
Both the ADuM1250 and the ADuM1251 contain hot swap
circuitry to prevent glitching data when an unpowered card
is inserted onto an active bus.
These isolators are based on the 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 I2C interface to be implemented in a small form factor.
The ADuM1250 provides two bidirectional channels, supporting
a complete isolated I2C interface. The ADuM1251 provides one
bidirectional channel and one unidirectional channel for applica-
tions where a bidirectional clock is not required.
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. G
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