MCZ145012EGR2

Sensor And Detector Interfaces Overview

The MCZ145012EGR2 is a CMOS photoelectric smoke detector integrated circuit designed for battery-powered applications. It operates within a supply voltage range of 6.0 V to 12 V, with an average standby current of 8 µA and an operating temperature range of -10 °C to 60 °C. The device interfaces with an infrared photoelectric chamber to detect scattered light from smoke particles. It features on-chip push-pull drivers for external piezoelectric transducers and supports temporal pattern horn drivers compliant with NFPA 72, ANSI S3.41, and ISO 8201 standards. The IC includes an I/O pin for interconnecting up to 40 units for common signaling.

Sensor And Detector Interfaces Feature Summary

• Integrated variable-gain photo amplifier allows direct interface to IR detectors with gain settings determined by external capacitors.
• Supports wired-OR configuration via the I/O pin to connect multiple units for common signaling or activate auxiliary devices.
• Includes power-on reset functionality that places the IC in standby mode upon initialization.
• Features electrostatic discharge (ESD) and latch-up protection circuitry on all pins.

Sensor And Detector Interfaces Applications

• Photoelectric smoke detection systems
• Battery-powered fire alarm units
• Interconnected smoke detector networks

Sensor And Detector Interfaces Procurement Notes

Verify the component revision and package suffix against the official datasheet to ensure compatibility with lead-free manufacturing processes. Confirm that the ordering suffix corresponds to the required packaging type and environmental compliance specifications before finalizing procurement orders.

Sensor And Detector Interfaces Selection Notes

Select this component for designs requiring low-power consumption and compliance with specific emergency evacuation signal standards. Ensure the application utilizes an infrared photoelectric chamber and provides appropriate external components for gain setting and timing control as specified in the typical application circuits.

Sensor And Detector Interfaces Part Context

This component belongs to the MC145012 family of photoelectric smoke detector ICs manufactured by Freescale Semiconductor. It serves as a specialized sensor controller designed to replace discrete analog and digital logic solutions in smoke detection hardware.

Sensor And Detector Interfaces Replacement Considerations

MC145012DW

Sensor And Detector Interfaces FAQ

How does the I/O pin function in a multi-unit system?

The I/O pin allows up to 40 units to be interconnected for common signaling using a wired-OR configuration. A local-smoke condition activates the driver to signal remote smoke to other connected units.

What indicates a degraded chamber sensitivity?

A beep or chirp occurring halfway between LED flashes indicates degraded chamber sensitivity. This can be distinguished from a low-supply condition by performing a push-button test.

Can the device operate if the supply voltage drops below the alarm threshold?

Yes, a low-supply condition does not affect smoke detection capability if the supply voltage remains at or above 6.0 V.