MC145010EG

Sensor And Detector Interfaces Overview

The MC145010 is a CMOS integrated circuit designed for photoelectric smoke detection systems. It operates on a 6 V to 12 V supply with an average standby current of 12 µA. The IC interfaces directly with infrared photodiodes and uses variable-gain amplification to detect scattered light from smoke particles. It features a wired-OR I/O pin capable of connecting up to 40 units for common signaling, alongside drivers for external piezoelectric transducers and visible LEDs. The device includes internal power-on reset, ESD protection, and low-supply detection circuits.

Sensor And Detector Interfaces Feature Summary

• Variable-gain photo amplifier allows direct interface to IR detectors
• Wired-OR I/O pin supports interconnection of up to 40 units
• Integrated push-pull drivers for external piezoelectric transducers
• Low-supply detection circuitry conducts periodic checks using pulsed load current

Sensor And Detector Interfaces Applications

• Photoelectric smoke detector systems complying with UL217 and UL268 specifications
• Battery-powered fire alarm devices
• Interconnected multi-unit smoke alarm networks

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix (P, ED, or DW) to confirm the required package type and temperature range before procurement. Ensure that the selected variant matches the intended operating environment constraints. Confirm component authenticity through authorized distribution channels to guarantee compliance with specified electrical characteristics.

Sensor And Detector Interfaces Selection Notes

Select the P suffix for plastic DIP packaging or the ED/DW suffixes for SOICW packages based on board layout requirements. Consider the extended temperature range (-55°C to +125°C) available in specific variants if operation outside the standard -10°C to +60°C range is necessary. Evaluate external component values for gain setting and oscillator timing to meet specific sensitivity calibration needs.

Sensor And Detector Interfaces Part Context

This component belongs to the family of specialized analog-digital mixed-signal ICs developed by Freescale Semiconductor, now part of NXP. It is engineered specifically for safety-critical sensing applications requiring high reliability and low power consumption. The design integrates complex signal processing functions into a single compact package to simplify system architecture.

Sensor And Detector Interfaces Replacement Considerations

Direct functional replacements are not explicitly listed in the provided documentation. When substituting, ensure the alternative device supports the same 6 V to 12 V operating voltage, compatible pinout for C1/C2 gain settings, and similar I/O drive capabilities for interconnected alarm systems.

Sensor And Detector Interfaces FAQ

How is the gain of the photo amplifier determined?

The gain is set by two external capacitors, C1 and C2. Low gain is used during standby, medium gain during local smoke conditions, and high gain during push-button tests or chamber sensitivity monitoring.

What is the maximum number of units that can be interconnected?

Up to 40 units can be connected together using the I/O pin in a wired-OR configuration for common signaling.

How does the device indicate a low-supply condition?

A beep or chirp occurs virtually simultaneously with an LED flash to indicate a low-supply condition, distinguishing it from smoke alarms which feature pulsating audible tones.