ADUM1255AWA+

The ADuM1255 offers two open- drain channels, one unidirectional and one bidirectional for applications, such as I2C, 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 ADuM1255 features independent 2.25V to 5.5V supplies on both side 1 and side 2 of the isolator. The device operates up to 2MHz. The ADuM1255 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 ADuM1255 is available in 8- pin narrow- and widebody SOIC packages. The devices are rated for operation at ambient temperatures of - 40°C to +125°C

Applications

• Isolated I2C/SMBus Interface
• Battery Management Systems
• Power Over Ethernet (PoE)
• Motor Control Systems

Key features

• Low VOL(MAX) for Greater I2C Device Compatibility Side 1: 0.69V Side 2: 0.4V
• Independent VDD1/VDD2 Supplies Support 3.3V and 5V Logic Voltage Levels and Allow Level Shifting 2.25V to 5.5V for Both Sides
• Hot- Swappable Side 2 I/O Prevents Data Corruption
• Initial Side 2 Connection Occurs at Bus Idle or Stop States
• Bidirectional I2C Data Transfer up to 2MHz
• SCL 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: 445VpMS 8- Wide SOIC: 848VRMS
• Withstands ± 10kV Surge per IEC 61000- 4- 5
• Package Creepage and Clearance 8- Narrow SOIC: 4mm 8- Wide SOIC: 8mm
• Safety and Regulatory Approvals (Pending)
• IEC60747- 17 (Pending) Reinforced ViORM Narrow SOIC: 630VPEAK Reinforced ViORM Wide SOIC: 1200VPEAK
• UL 1577 (Pending) 8- Narrow SOIC: 3000VRMS for 1min 8- Wide SOIC: 5000VRMS for 1min
• IEC/EN/CSA 62368- 1 (Pending)
• IEC/EN/CSA 61010- 1 (Pending)
• CAN/CSA- C22.2 No.14- 18 (Pending)