RE46C803SS20

Sensor And Detector Interfaces Overview

The RE46C803SS20 is a low-voltage, low-power CMOS carbon monoxide detector companion IC designed for microcontroller-based CO or toxic gas detectors. It operates from a 3V battery supply and integrates essential analog, interface, and power regulation functions. Key electrical parameters include a standby supply current of 2.2 µA typical (max 3.5 µA) and a quiescent current of 33 µA typical (max 52 µA). The device features a 9V boost converter, a 3.3V regulator for the microcontroller, and a 1.8V regulator for sensor biasing. It includes an internal operational amplifier with a 10 kHz gain-bandwidth product and unity gain stability.

Sensor And Detector Interfaces Feature Summary

• Integrates a 9V boost converter, dual voltage regulators (3.3V and 1.8V), horn driver, LED driver, and an internal operational amplifier to support microcontroller-based CO detection systems.
• Features a rail-to-rail input/output operational amplifier powered by the 1.8V regulator, providing necessary signal conditioning for electrochemical sensors.
• Includes dedicated logic inputs (HRNEN, LEDEN) to control alarm signaling via piezoelectric horns and visual indicators during boost mode operation.

Sensor And Detector Interfaces Applications

• Microcontroller-based carbon monoxide (CO) detectors
• Toxic gas detection systems requiring low-power analog front-end processing
• Battery-operated safety devices utilizing piezoelectric horns and LED indicators

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix 'SS20' corresponds to the 20-lead SSOP package configuration as defined in the Microchip Product Identification System. Confirm that the required packaging format matches the datasheet specifications for this variant. Ensure compatibility with the intended operating temperature range of -10°C to +60°C for the application environment.

Sensor And Detector Interfaces Selection Notes

Select the RE46C803SS20 when designing a 3V battery-powered CO detector that requires integrated power management and signal conditioning. This component is suitable for applications needing a 9V boost for horn drivers and regulated voltages for both the MCU and sensor circuitry. Consider the thermal resistance of the SSOP package if high ambient temperatures are expected within the specified operating range.

Sensor And Detector Interfaces Part Context

The RE46C803 belongs to Microchip's family of companion ICs specifically engineered for gas detection applications. Unlike smoke detector ICs such as the RE46C1xx series, this device focuses on CO sensing requirements, providing a dedicated 1.8V reference and op-amp for electrochemical sensors. It serves as a specialized solution for integrating analog front-end functions into compact, battery-operated safety devices.

Sensor And Detector Interfaces Replacement Considerations

No direct public substitute part numbers are documented for the RE46C803SS20. Designers should evaluate other Microchip gas detector companion ICs based on specific voltage and feature requirements, noting that pinouts and internal architectures may differ significantly across the product family.

Sensor And Detector Interfaces FAQ

What is the purpose of the VREG2 pin?

The VREG2 pin provides a nominal 1.8V regulated output. It powers the internal low-offset operational amplifier, the voltage reference (VREF) circuit for CO detection, and can externally power other circuits like thermal sensors.

How is the boost mode initiated?

Boost mode is initiated by the microcontroller driving the CEN pin high. This action enables both the 9V boost regulator and the 3.3V voltage regulator, allowing the device to drive high-current loads like horns or LEDs.

What are the absolute maximum ratings for the FEED pin?

The absolute maximum input voltage range for the FEED pin is -10V to +22V. Exceeding these limits may cause permanent damage to the device.