Two-Wire Loop-Powered PWM Signal Conditioning Module TW147HL

The TW147HL is a two-wire loop-powered PWM signal conditioning module designed to convert PWM input signals into isolated 4–20mA current outputs. Housed in a compact SIP9 package (26×9.5×12.5mm), it delivers 2000VAC isolation and operates reliably across –40°C to +85°C with ultra-low temperature drift (≤50 ppm/°C). This module eliminates external DAC requirements, making it ideal for smart field instruments in industrial automation systems

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Key Features & Specifications

• Direct PWM-to-Current Conversion: Isolates and converts PWM inputs to 4–20mA signals without external DACs.

• Integrated HART Communication: Supports HART protocol for half-duplex communication between field devices and control systems (e.g., via A5191 modem IC)

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• High Precision: 0.1% F.S. linearity with robust anti-interference performance.

• Loop-Powered Operation: Draws power from the 4–20mA output loop to supply front-end devices.

• Extended Protection: ±4kV ESD protection and cold-end temperature auto-compensation

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• Auxiliary Power: Provides isolated 3.3VDC/4mA to support external components (e.g., MCUs or HART modems)

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• Modular Select (ModSelL) Support: Enables multi-module management on a single two-wire interface

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Industrial Applications

Optimized for two-wire smart instrumentation, the TW147HL interfaces seamlessly with PLCs, DCS, and industrial control systems. Its compact design suits:

• Sensor signal conditioning

• Process control loops

• HART-enabled networks

• Space-constrained field devices

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Technical Advantages

Using electromagnetic isolation and efficient power feedback technology, the module ensures accurate signal conversion while reducing installation costs by eliminating compensation wires and temperature transmitters. The SIP9 package simplifies integration in high-density applications

For full specifications and application diagrams, refer to the official TW147HL Datasheet (PDF)