The MAX31865 simply and elegantly solves the common industrial design problem of digitizing a platinum RTD (such as a Pt100 or Pt1000) resistance, protects against ±50V input overvoltages, and detects sensor and cable faults. In addition, the device simplifies resistance measurement by eliminating the precisely matched current sources used for 3-wire sensor connections in conventional designs. The built-in overvoltage protection also eliminates the need for external protection circuitry, which lowers cost, reduces board space, and increases factory uptime.
Key Advantages:
• High ±0.5 °C accuracy helps designers meet error budgets
• Improved reliability and cost savings associated with replacing multiple components, including a high-resolution analogue-to-digital converter, a protected analogue switch, and a variety of op amps and comparators
• Smaller form factor, lower heat dissipation, and up to 50% lower system cost
• Automatic detection of open and shorted sensor conditions, input overvoltage, cable shorts, and open circuits
Availability and Pricing:
• Limited sampling now; available mid-November
• Available in a 20-pin TQFN package (5mm x 5mm)
• Pricing starts at $3.00 (1000-up, FOB USA)