CA-IS2092A Isolated RS-485 Transceivers with Integrated DC-DC Converter

The CA-IS2092A family of devices is galvanically-isolated RS-485 transceivers with built-in isolated DC-DC converter, that eliminates the need for a separate isolated power supply in space constrained isolated designs. The transceivers have the logic input and output buffers separated by a silicon oxide (SiO2) insulation barrier that provides up to 2.5kVRMS (60s) of galvanic isolation and ±150kV/μs typical CMTI Isolation improves data communication by breaking ground loops and reduces noise where there are large differences in ground potential between ports. An integrated DC-DC converter generates the 3.3V or 5V operating voltage for the cable-side.

The CA-IS2092A is designed for multi-drop operation with high ESD protection of up to ±8kV Human Body Model (HBM) on the bus pins. The receiver is 1/8-standard-unit load, allowing up to 256 transceivers (loads) on a common bus. The CA-IS2092A provides half-duplex transceivers.This device provides slow slew rate to minimize EMI and reflections, allowing for error-free data transmission up to 0.5Mbps. The individual logic supply input allows fully compatible 2.5V to 5.5V logic on logic input lines.

The CA-IS2092A device is available in LGA16 package and operates over -40°C to +125°C temperature range.

1. Features

• High-Performance and Compliant with RS-485 EIA/TIA-485 Standard
• • Data rate is up to 0.5Mbps
  • 1/8 unit load enables up to 256 nodes on the bus
  • 3.0V to 5.5V DC-DC supply voltage range(VDDP)
  • 2.5V to 5.5V RS-485 supply input(VDDL)

• Integrated DC-DC Converter for Cable-side Power
• • 3.3V and 5V output options
  • High integration with internal transformer
  • Soft-start reduces input inrush current
  • Overload and short-circuit protection
  • Thermal shutdown

• Robust Galvanic Isolation of Digital Signals
• • 2.5kVRMS withstand isolation voltage for 60s (galvanic isolation)
  • ±150kV/μs typical CMTI
  • High lifetime: >40 years

• Integrated Protection for Robust Communication
• • ±8kV Human Body Model(HBM) ESD protection on bus I/O
  • True fail-safe guarantees known receiver output state
  • Driver current limit and thermal shutdown

• Wide operating temperature range: –40°C to 125°C
• LGA16 Package

• Safety Regulatory Approvals(pending)

• • 3535VPK VIOTM and 566VPK VIORM per DIN VDE V0884-11:2017-01
  • 2.5kVRMS isolation for 1 minute per UL 1577

2. Applications

• Industrial Automation Equipment
• Solar inverter
• Motor drivers
• Building automation