ADuM1252/3: ultra-low power, uni-or-bidirectional I2C isolator with extended VDD, idle-bus hot-swap and low VOL
The ADuM1252 works well for applications, such as I2C, that require data to be transmitted in both directions on the same line. The ADuM1253 is ideal for applications that require data to be transmitted in both directions on the same line but have a unidirectional clock.
To prevent latch-up action, side 1 outputs comprise special buffers that regulate the logic-low voltage at 0.64V, and the input logic-low threshold is at least 50mV lower than the output logic-low voltage. Side 2 features conventional buffers that do not regulate logic-low output voltage.
The ADuM1252/3 features independent 1.71V to 5.5V supplies on both side 1 and side 2 of the isolator. The device operates up to 2MHz. The ultra-low standby current of 21μA per side is ideal for battery-operated systems.
The ADuM1252/3 provides a disturbance-free bus connection for hot-plug connections on side 2 by first precharging the bus pins and then monitoring the bus state for either an idle bus or detection of an I2C stop condition before connecting side 1 and side 2.
The ADuM1252/3 is available in an 8-pin narrow SOIC package. The device is rated for operation at ambient temperatures of -40°C to +125°C.
Key Features and Benefits
Low VOL(MAX) for Greater I2C Device Compatibility
Side 1: 0.69V
Side 2: 0.4V
Ultra-Low Power Consumption for Longer Battery Life
142μA (typ) per Channel at 400kHz
Wide Independent VDD1/VDD2 Supply Range Supports More Logic Voltage Levels and Allows Level Shifting
1.71V to 5.5V for Both Sides
Hot-Swappable Side 2 I/O
Initial Side 2 Connection Occurs at Bus Idle or Stop States to Prevent Data Corruption
Bidirectional I2C Data Transfer up to 2MHz SCL
Bidirectional SCL for Advanced Bus Topologies (ADuM1252)
Supports Clock Stretching and Multiple Controllers Across Isolation Barrier (ADuM1252)
Strong Current Sinking Enables Lower RPULL-UP Values for Faster Bus Speeds
Side 1: 5mA
Side 2: 50mA
Robust Galvanic Isolation of Digital Signals
Continuously Withstands (VIOWM)
8-Narrow SOIC: 445VRMS
Withstands ±10kV Surge per IEC 61000-4-5
Package with Creepage and Clearance
8-Narrow SOIC: 4mm
Safety and Regulatory Approvals (Pending)
IEC60747-17 (Pending)
Reinforced VIORM Narrow SOIC: 630VPEAK
UL 1577 (Pending)
8-Narrow SOIC: 3000VRMS for 1min
IEC/EN/CSA 62368-1 (Pending)
IEC/EN/CSA 61010-1 (Pending)
CAN/CSA-C22.2 No. 14-18 (Pending)
Applications
Isolated I2C/SMBus Interface
Battery Management Systems
Power Over Ethernet (PoE)
Motor Control Systems
Evaluation Board
The ADuM1252/3 can be evaluated with the ADuM1252SEVKIT.
Block Diagrams and Tables
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