Pyro-electric motion sensor PYD 1788

indoorhigh-sensitivityhigh-precision

Product overview
The PYD 1788 and PYD 1798 DigiPyros are dual-element pyroelectric motion detectors in a TO-5 metal housing. They are re-engineered for improved energy efficiency (operation down to 1.8 V at 5 µA), making them suitable for long-life, battery-powered and remote sensing applications. Each device integrates signal conditioning and digitization to deliver a high-resolution digital output for direct interfacing to a host microcontroller.

Details
Both models share identical internal element configuration and electronics. Each detector contains two pyroelectric elements connected in series and an on-chip temperature diode. The PYD 1788 features a standard optical window for general sensing ranges; the PYD 1798 uses an enlarged window to provide a broader field of view. The internal circuitry converts each element signal to a 14-bit digital value, producing a combined 2x14-bit data stream transmitted over a single-wire Direct Link to the host.

Features

• Integrated 14-bit digitization per element
• High-responsivity ceramic pyroelectric elements
• Dual-detector configuration with two 1 mm² elements
• Wide field-of-view options (model dependent)
• TO-5 metal housing for EMI immunity
• Optimized for advanced motion detection algorithms and low-power operation

Applications

• Long-range motion detection with lenses
• Battery-powered energy-saving devices
• Intrusion and perimeter alarm systems
• Horizontal and embedded mounting designs

Technical specifications

• Responsivity: 4.0 kV/W (typical)
• Noise: 3 digits (typ), 12 digits (max)
• Housing with optical window: TO-5 metal housing
• Power requirement: 1.8–3.6 V / 5 µA (improved operation at 1.8 V / 5 µA)
• PYD 1798 field-of-view (horiz/vert): 110° / 110°
• PYD 1788 field-of-view (horiz/vert): 95° / 87°
• Element configuration: two elements in series (dual-element)
• Element size: two 1 mm² elements
• Output format: two 14-bit values delivered as a single 2x14-bit digital bit stream via one-wire Direct Link
• Built-in temperature diode: provides temperature-related data included in the combined digital signal