RE46C800SS20T

Sensor And Detector Interfaces Overview

The RE46C800SS20T is a CMOS ASIC designed for microcontroller-based CO, toxic gas, and smoke detectors. It integrates power management, analog signal conditioning, and output drivers 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 2V to 5.5V on VDD, a boost regulator output (VBST) typically at 4V or 9.8V, and a regulated 3.3V output (VREG). Standby current is 13.6 µA with the boost running. The internal op amp features ±1 mV input offset voltage, 10 kHz gain bandwidth product, and rail-to-rail I/O.

Sensor And Detector Interfaces Feature Summary

• Integrated power management system supporting 3V/9V batteries and AC power sources
• Built-in boost regulator providing nominal 4V or 9.8V outputs for horn driver operation
• Low offset operational amplifier with rail-to-rail inputs and outputs for sensor biasing
• Bidirectional interconnect circuitry enabling communication between interconnected alarm units

Sensor And Detector Interfaces Applications

• Carbon Monoxide Detectors
• Toxic Gas Detectors
• Smoke Detectors

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature range. Ensure component authenticity through authorized distribution channels. Confirm that the delivered part matches the exact alphanumeric designation required for the design specification.

Sensor And Detector Interfaces Selection Notes

Select this component when designing systems requiring integrated power regulation, piezoelectric horn driving, and electrochemical sensor amplification. Verify that the operating environment falls within the specified -10°C to +60°C range. Ensure external components meet the low ESR requirements for the boost regulator capacitor and inductor connections.

Sensor And Detector Interfaces Part Context

This component belongs to the RE46C800 family of detector power management systems. It consolidates functions previously handled by multiple discrete components into a single ASIC. The family is specifically engineered for safety applications requiring reliable low-power operation and acoustic signaling capabilities.

Sensor And Detector Interfaces Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative Microchip RE46Cxxx series devices only if they offer compatible pinouts and functional equivalents for the specific application requirements.

Sensor And Detector Interfaces FAQ

How does the RE46C800 handle power source selection?

The device uses the 9VDET and ACDET pins to select between VDD and VREG as the internal supply. If 9VDET is high, VREG is disabled. If ACDET is high, VREG is enabled regardless of the 9VDET state.

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. If the horn driver is not used, this pin must be connected to VSS.

What are the absolute maximum ratings for the VDD pin?

The absolute maximum rating for the VDD supply voltage is -0.3V to 5.5V. Exceeding these limits may cause permanent damage to the device.