Overview
The ISO1642DWR from Texas Instruments is a robust, hot-swappable, bidirectional I²C isolator designed to provide reliable and high-speed data transfer across isolated domains. This device is part of the ISO164x family, which integrates the necessary logic for bidirectional communication and additional isolated GPIO channels. The ISO1642DWR is particularly suited for applications requiring high isolation ratings, low emissions, and robust electromagnetic compatibility (EMC).
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC1, VCC2) | -0.5 | 6 | V | |
| Input/Output Voltage (SDA1, SCL1, SDA2, SCL2) | -0.5 | VCCX + 0.5 | V | |
| Input/Output Current (SDA1, SCL1) | 0 | 20 | mA | |
| Input/Output Current (SDA2, SCL2) | 0 | 100 | mA | |
| Maximum Junction Temperature (TJ) | 150 | °C | ||
| Storage Temperature (Tstg) | -65 | 150 | °C | |
| Isolation Voltage (VIOWM) | 5000 | VRMS | ||
| Common Mode Transient Immunity (CMTI) | ±100 | kV/μs | ||
| Data Rate | 50 | Mbps | ||
| Propagation Delay (tpLH / tpHL) | 70ns / 88ns |
Key Features
- Hot-swappable, low-power, bidirectional I²C isolator
- Bidirectional SDA and SCL communication with up to 1.7 MHz operation
- Up to 3 additional unidirectional isolated GPIO channels supporting 50 Mbps speed
- Robust isolation barrier with >100-year projected lifetime at 450 VRMS working voltage (D-8) and 1500 VRMS working voltage (DW-16)
- Up to 5000 VRMS isolation rating per UL1577 and up to 10 kV reinforced surge capability
- ±100 kV/μs typical CMTI and ±8 kV IEC-ESD 61000-4-2 contact discharge protection across isolation barrier
- Supply range: 3 V to 5.5 V (Side 1) and 2.25 V to 5.5 V (Side 2)
- Open-drain outputs with 3.5-mA (Side 1) and 50-mA (Side 2) current-sink capability
- Operating temperature range: -40°C to +125°C
- Safety-related certifications including UL 1577, DIN VDE V 0884-11, IEC 62368-1, IEC 61010-1, and IEC 60601-1
Applications
- Isolated I²C buses
- Isolated I²C and SPI buses
- SMBus and PMBus interfaces
- Power Over Ethernet (PoE)
- Motor control systems
- Battery management systems
Q & A
- What is the primary function of the ISO1642DWR?
The ISO1642DWR is a bidirectional I²C isolator designed to provide isolated communication between two domains while maintaining high-speed data transfer and robust EMC.
- What are the key isolation specifications of the ISO1642DWR?
The device has an isolation rating of up to 5000 VRMS, a maximum transient isolation voltage of 7071 VPK, and a maximum surge isolation voltage of 6250 VPK.
- What is the data rate supported by the ISO1642DWR?
The ISO1642DWR supports bidirectional data transfer up to 1.7 MHz and additional GPIO channels with speeds up to 50 Mbps.
- What are the supply voltage ranges for the ISO1642DWR?
The supply voltage ranges are 3 V to 5.5 V for Side 1 and 2.25 V to 5.5 V for Side 2.
- What are the safety-related certifications for the ISO1642DWR?
The device is certified according to UL 1577, DIN VDE V 0884-11, IEC 62368-1, IEC 61010-1, and IEC 60601-1.
- What is the operating temperature range of the ISO1642DWR?
The operating temperature range is -40°C to +125°C.
- Does the ISO1642DWR support hot-swapping?
- What is the common mode transient immunity (CMTI) of the ISO1642DWR?
The CMTI is typically ±100 kV/μs.
- What are the package options for the ISO1642DWR?
The device is available in 16-SOIC (DW-16) and 8-SOIC (D-8) package options.
- What is the maximum power dissipation for the ISO1642DWR?
The maximum power dissipation is 96 mW for both sides, with 43 mW for Side 1 and 53 mW for Side 2.
