RE46C800SS20

Sensor And Detector Interfaces Overview

The RE46C800SS20 is a CMOS ASIC designed for microcontroller-based CO, toxic gas, and smoke detectors. It integrates power management, analog sensing, and signaling functions in a 20-lead SSOP package. The device operates from a 3V or 9V battery or AC-derived power. Key electrical parameters include a supply voltage range of 5V to 62V (typical VDD 3V), a boost regulator output of 9.8V nominal, and a regulated 3.3V output for the MCU. Quiescent current is typically 6.8µA at VBST=5V. Operating temperature ranges from -10°C to +60°C.

Sensor And Detector Interfaces Feature Summary

• Integrated low-offset operational amplifier with rail-to-rail input and output capabilities for electrochemical sensor biasing.
• Dual-mode boost regulator providing nominal 4V or 9.8V outputs to drive piezoelectric horns and LED indicators.
• Bidirectional interconnect circuitry enabling communication between interconnected detector units.
• Flexible power management system supporting operation from low-voltage batteries, 9V sources, or AC power.

Sensor And Detector Interfaces Applications

• Carbon Monoxide Detectors
• Toxic Gas Detectors
• Smoke Detectors

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix 'SS20' against official Microchip documentation to confirm the exact package type and tape-and-reel quantity specifications. Ensure that the operating environment remains within the specified -10°C to +60°C range to maintain guaranteed electrical characteristics. Confirm RoHS compliance status through the manufacturer's latest environmental declarations.

Sensor And Detector Interfaces Selection Notes

Select this component when designing systems requiring integrated power management, horn driving, and op-amp functionality for gas sensing. Ensure the external inductor and Schottky diode can handle peak currents exceeding 1A during high-boost operation. Verify that the PCB layout minimizes series resistance below 0.3Ω to support low-voltage battery performance effectively.

Sensor And Detector Interfaces Part Context

The RE46C800 belongs to the RE46C family of specialized application-specific integrated circuits developed by Microchip Technology. These devices are engineered specifically for safety and security applications, combining analog signal processing with power regulation to reduce component count and system complexity in battery-operated detection equipment.

Sensor And Detector Interfaces Replacement Considerations

Consult Microchip datasheets for alternative models within the RE46C series that offer compatible pinouts or enhanced features. Verify functional equivalence regarding boost regulator voltages and op-amp specifications before substitution.

Sensor And Detector Interfaces FAQ

How does the RE46C800 manage power source selection?

The device uses the 9VDET and ACDET pins to determine whether to power internal circuitry from the VDD pin (low-voltage battery) or the VREG pin (regulated 3.3V derived from 9V or AC sources).

What is the function of the FEED pin?

The FEED pin is typically connected to the feedback electrode of a piezoelectric horn through a current-limiting resistor to enable self-oscillation. If unused, it must be connected to VSS.

Can the internal op-amp be used for purposes other than CO sensing?

Yes, the unity gain stable op-amp can be utilized for other analog tasks such as temperature sensing, provided the input and output voltage ranges are respected.