RE46C194S16

Sensor And Detector Interfaces Overview

The RE46C194 is a low-power, low-voltage CMOS photoelectric smoke detector ASIC designed for operation from a single 3V lithium cell or two AA batteries. It integrates a programmable gain photo amplifier, a 6-bit ADC, and an internal oscillator that powers the detection circuitry every 10 seconds to minimize standby current. The device supports temporal and continuous horn patterns, interconnects up to 40 detectors, and includes features such as a 9-minute hush timer, chamber testing, and long-term drift adjustment. It operates within a temperature range of 0°C to +60°C.

Sensor And Detector Interfaces Feature Summary

• Integrates a programmable gain photo amplifier with a 6-bit ADC for precise smoke detection.
• Supports interconnection of up to 40 detectors with horn synchronization and auto alarm locate capabilities.
• Includes a 9-minute hush timer and multiple user-selectable hush operation modes.
• Features automatic low battery testing and chamber integrity checks in standby mode.

Sensor And Detector Interfaces Applications

• Photoelectric smoke detectors
• Multi-unit fire alarm systems requiring interconnect
• Battery-powered safety devices

Sensor And Detector Interfaces Procurement Notes

Verify the specific package type and ordering suffix against the manufacturer's official documentation before purchase. Confirm that the component meets the required environmental specifications and RoHS compliance standards for the intended application. Ensure compatibility with existing design constraints regarding voltage levels and interface requirements.

Sensor And Detector Interfaces Selection Notes

Select this component for applications requiring low quiescent current consumption and minimal external components. Consider the programmable IRED drive current and alarm limits if customization during manufacturing is required. Evaluate the need for interconnect features and specific horn patterns when designing the system architecture.

Sensor And Detector Interfaces Part Context

This component belongs to Microchip Technology's family of low-voltage photoelectric smoke detector ICs. It shares functional similarities with other models in the series but offers specific integration levels and feature sets tailored for standalone or interconnected smoke detection systems.

Sensor And Detector Interfaces Replacement Considerations

The datasheet notes compatibility with the RE46C191. Verify pinout and electrical characteristics before substituting. No other direct replacements are confirmed in the provided documentation.

Sensor And Detector Interfaces FAQ

How does the RE46C194 handle long-term drift?

It can be enabled to calculate a long-term drift adjustment by averaging 64 integration measurements over 8 hours, which is then added to the stored alarm limits.

What is the function of the TEST input pin?

The TEST input invokes test modes, programming modes, and can initiate Push-To-Test or Hush operations depending on the duration and state of the signal.

How often does the device perform a low battery check?

A low battery condition check is performed every 86 seconds, with four checks occurring in each 344-second period.