RE46C190S16TF

Sensor And Detector Interfaces Overview

The RE46C190 is a low-power, low-voltage CMOS photoelectric smoke detector ASIC designed for two AA battery operation. It features an internal oscillator that powers detection circuitry every 10 seconds to minimize standby current. The device includes a gain-selectable photo amplifier, programmable IRED driver (50-200 mA), and DC-DC boost converter. Electrical characteristics specify a supply voltage range of 3V to 5.0V, with typical standby current of 12 µA. Operating temperature ranges from -10°C to +60°C. It supports interconnect for up to 40 detectors and offers temporal or continuous horn patterns compliant with NFPA 72.

Sensor And Detector Interfaces Feature Summary

• Integrated photoelectric smoke detection with gain-selectable amplifier and internal infrared emitter diode driver
• Supports interconnection of up to 40 units for synchronized alarm signaling via bidirectional IO pin
• Includes supervisory tests for low battery and chamber integrity with configurable hysteresis and silence modes
• Features local alarm memory with visual indication and end-of-life aging counter

Sensor And Detector Interfaces Applications

• Photoelectric-type smoke detectors complying with UL217 and UL268 specifications
• Multi-unit fire alarm systems requiring interconnect capability
• Battery-powered residential smoke alarms utilizing two AA batteries

Sensor And Detector Interfaces Procurement Notes

Verify component authenticity through authorized Microchip distributors. Confirm the specific suffix matches the required package and temperature grade. Note that this component is marked as not recommended for new designs; consult datasheet for RE46C191 alternatives. Ensure ordering documentation aligns with current manufacturing status.

Sensor And Detector Interfaces Selection Notes

Select based on required IRED drive current options ranging from 50 mA to 200 mA. Consider programming flexibility for low battery thresholds between 2.1V and 2.8V. Evaluate horn pattern requirements for temporal versus continuous output. Verify compatibility with external piezoelectric transducers and LED indicators within the specified voltage limits.

Sensor And Detector Interfaces Part Context

The RE46C190 is part of Microchip's specialized analog mixed-signal portfolio for safety applications. It serves as a dedicated ASIC for smoke detection, integrating power management, signal processing, and control logic. This component represents a legacy solution in the company's fire safety line, succeeded by improved versions for modern design requirements.

Sensor And Detector Interfaces Replacement Considerations

The RE46C191 is documented as an improved version recommended for new designs. Consult Microchip marketing for specific substitution details and feature enhancements over the RE46C190.