ADUM2250 Datasheet, PDF (1/16 Pages) Analog Devices – Hot-Swappable, Dual I2C Isolators, 5 kV

Hot-Swappable, Dual I²C Isolators, 5 kV
ADuM2250/ADuM2251
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
Wide body, 16-lead SOIC package with >8 mm creepage
High temperature operation: 105°C
Safety and regulatory approvals
UL recognition (pending)
5000 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
VIORM = 846 V peak
APPLICATIONS
Isolated I²C, SMBus, or PMBus Interfaces
Multilevel I²C interfaces
Power supplies
Networking
Power-over-Ethernet
GENERAL DESCRIPTION
The ADuM2250/ADuM2251¹ 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.
The ADuM2250 provides two bidirectional channels support-
ing a complete isolated I²C interface. The ADuM2251 provides
one bidirectional channel and one unidirectional channel for
those applications where a bidirectional clock is not required.
The ADuM2250/ADuM2251 contain hot-swap circuitry to
prevent data glitches 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 performance, size, power consump-
tion, and functional advantages compared to optocouplers.
The ADuM2250/ADuM2251 integrate iCoupler channels
with semiconductor circuitry to enable a complete, isolated
I²C interface in a small form-factor package.
1 _{Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329; other patents}
pending.
FUNCTIONAL BLOCK DIAGRAMS
GND₁ 1
NC 2
ADuM2250
16 GND₂
15 NC
V_DD1 3
NC 4
DECODE
ENCODE
14 V_DD2
13 NC
SDA₁ 5
SCL₁ 6
ENCODE
DECODE
DECODE
ENCODE
12 SDA₂
11 SCL₂
GND₁ 7
ENCODE
DECODE
10 NC
NC 8
9 GND₂
NC = NO CONNECT
Figure 1. ADuM2250 Functional Block Diagram
GND₁ 1
NC 2
ADuM2251
16 GND₂
15 NC
V_DD1 3
NC 4
DECODE
ENCODE
14 V_DD2
13 NC
SDA₁ 5
SCL₁ 6
ENCODE
ENCODE
DECODE
DECODE
12 SDA₂
11 SCL₂
GND₁ 7
10 NC
NC 8
9 GND₂
NC = NO CONNECT
Figure 2. ADuM2251 Functional Block Diagram
Rev. 0
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