Pyroelectric infrared sensor PYQ 5848

Overview
The PYQ 5848 and PYQ 2898 are 4-element dual-channel digital pyroelectric sensors housed in a TO-5 metal package. They belong to the DigiPyro® family and integrate on-chip circuitry to convert element signals into 14-bit digital outputs.

Details
The PYQ 5848 uses diagonally arranged element pairs for ceiling-mounted installations, providing motion-direction-independent detection. The PYQ 2898 uses parallel element pairs for wall-mounted installations and supports differential motion analysis to help discriminate object size (for example, pet-immune wall applications). Both models include a built-in temperature diode for internal temperature reporting. The combined output is delivered as three 14-bit signals serialized into a single digital bit stream transmitted via a single-wire direct link to a host microprocessor.

Key capabilities

• On-chip digitization with 14-bit digital output
• High-responsivity ceramic pyroelectric elements
• Quad detector configuration with 4 x 1 x 1 (0.4) mm2 elements
• TO-5 metal housing for enhanced EMI immunity
• Optimized for advanced motion-detection algorithms

Applications

• Long-range motion detection with lenses
• Energy-saving presence detection systems
• Intrusion alarm systems
• Pet-immune wall-mounted designs (PYQ 2898)
• Ceiling-mounted installations (PYQ 5848) and horizontal/wall-mounted installations (PYQ 2898)

Technical specifications

• Responsivity: 4.5 kV/W (PYQ 2898), 8 kV/W (PYQ 5848) (typical)
• Noise: 6 digits (typical), 15 digits (max)
• Housing with optical window: TO-5 metal housing
• Power requirement: 2.7–3.6 V / 10 µA
• Field-of-view (PYQ 5848 horiz/vert): 124°
• Field-of-view (PYQ 2898 horiz): 100°
• Quad detector element size: 4 x 1 x 1 (0.4) mm2
• Built-in temperature diode for internal temperature output
• Output format: three 14-bit signals serialized into a single digital bit stream via single-wire direct link
• Element arrangements: diagonal pairs (PYQ 5848) for direction-independent ceiling sensing; parallel pairs (PYQ 2898) for differential motion/size discrimination in wall-mounted applications