ADuM1255
RECOMMENDED FOR NEW DESIGNSI2C Isolator with Unidirectional SCL, Idle-bus Hotswap and Low VOL
Part Details
- 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: 445VRMS
- 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)
- Continuously Withstands (VIOWM)
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
Documentation
This is the most up-to-date revision of the Data Sheet.
Tools & Simulations
IBIS Model 1
Evaluation Kits
Evaluates: ADuM1252, ADuM1253, ADuM1254, ADuM1255
Resources
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