MC145010DWR2 Device Information

Device Overview

• Device Name: MC145010DWR2
• Package Type: SOIC (Small Outline Integrated Circuit)
• Package Pins: 16
• Operating Voltage Range: 6V to 12V
• Operating Temperature Range: -10°C to 60°C
• Average Supply Current: 12μA

Features

• Advanced Smoke Detector Component: Contains sophisticated very-low-power analog and digital circuitry.
• Infrared Photoelectric Chamber: Used for smoke detection by sensing scattered light from smoke particles or other aerosols.
• On-Chip Push-Pull Drivers: For driving an external piezoelectric transducer to sound an alarm.
• Variable-Gain Photo Amplifier: Allows direct interface to IR detectors (photodiodes).
• External Capacitors: Two external capacitors (C1 and C2) determine the gain settings.
• Interconnect Capability: I/O pin can be used to interconnect up to 40 units for common signaling.
• Low-Supply Detection: Conducts periodic checks using a pulsed load current from the LED pin.
• UL Compliance: Designed to operate in smoke detector systems that comply with UL217 and UL268 specifications.
• ESD and Latch-Up Protection: Protection circuitry on all pins.
• Chip Complexity: 2000 FETs, 12 NPNs, 16 resistors, and 10 capacitors.

Pin Assignment

• Pin 1 (C1): Gain setting capacitor for pushbutton test and chamber sensitivity test.
• Pin 2 (C2): Gain setting capacitor for normal operation.
• Pin 3 (Detect): Input to the high-gain pulse amplifier.
• Pin 4 (Strobe): Provides a strobed, regulated voltage referenced to VDD.
• Pin 5 (VDD): Positive supply potential.
• Pin 6 (IRED): Provides pulsed base current for external NPN transistor used as the infrared emitter driver.
• Pin 7 (I/O): Used for interconnecting units and activating escape lights, auxiliary alarms, remote alarms, and auto-dialers.
• Pin 8 (Brass): Half of the push-pull driver output.
• Pin 9 (Silver): Half of the push-pull driver output.
• Pin 10 (Feedback): Input connected to the feedback electrode of a self-resonating piezoelectric transducer.
• Pin 11 (LED): Active-low open-drain output for driving an external visible LED.
• Pin 12 (OSC): Used in conjunction with external resistor R2 and capacitor C3 to form an oscillator.
• Pin 13 (R1): Used in conjunction with resistor R1 and capacitor C3 to determine the IRED pulse width.
• Pin 14 (VSS): Negative supply potential.
• Pin 15 (Low-Supply Trip): Determines the low-supply alarm threshold.
• Pin 16 (Test): Input for manually invoking a test mode.

Electrical Characteristics

• Power Supply Voltage Range: 6.0V to 12V
• Average Operating Supply Current: 12μA (standby mode)
• Peak Supply Current: 2.0mA (during strobe on, IRED off); 3.0mA (during strobe on, IRED on)
• Low-Level Input Voltage: 0.6V to 1.5V (I/O, Feedback, Test)
• High-Level Input Voltage: 3.2V to 8.5V (I/O, Feedback, Test)
• Input Current: ±100nA (OSC, Detect, Low-Supply Trip, Feedback)
• Low-Level Input Current: -1μA (Test)
• Pull-Down Current: 0.5mA to 100μA (Test, I/O)
• Low-Level Output Voltage: 0.6V to 1.0V (LED, Silver, Brass)
• High-Level Output Voltage: VDD - 0.1V to VDD - 5.6V (Silver, Brass)
• Output Voltage: 2.25V to 3.75V (Strobe, inactive); 0.1V to 500μA (Strobe, active)
• High-Level Output Current: -4mA to -16mA (I/O)
• Off-State Output Leakage Current: ±1μA (LED)

AC Electrical Characteristics

• Oscillator Period: 9.5ms to 11.5ms
• LED Pulse Period: 0.60ms to 0.74ms (no local smoke, no remote smoke); 9.5ms to 11.5ms (local smoke or pushbutton test)
• IRED Pulse Period: 9.67ms to 11.83ms (smoke test); 38.9ms to 47.1ms (chamber sensitivity test)
• IRED Pulse Width: 94μs to 116μs
• IRED Rise Time: 30μs
• IRED Fall Time: 200μs
• Silver and Brass Modulation Period: 9.5ms to 11.5ms
• Silver and Brass Duty Cycle: 73% to 77%
• Silver and Brass Chirp Pulse Period: 9.5ms to 11.5ms (low supply or degraded chamber sensitivity)
• Silver and Brass Chirp Pulse Width: 800ms

Ordering Information

• Package Type: SOIC
• Ordering Code: MC145010DW

Package Dimensions

• Case Style: 751G-03
• Dimensions:Length (A): 10.05mm to 10.55mmWidth (B): 2.35mm to 2.65mmHeight (C): 0.23mm to 0.32mmLead Length (D): 0.015mm to 0.021mmLead Width (E): 0.040mm to 0.070mmLead Thickness (F): 0.100mmLead Spacing (G): 0.100mmLead Pitch (H): 0.050mmLead Length (L): 0.295mm to 0.305mmLead Angle (M): 0° to 10°

Additional Information

• Calibration Mode: The device can be placed in a calibration mode by pulling the Test pin below the VSS pin with 100μA continuously drawn out for at least one OSC cycle.
• PCB Layout Recommendations: The layout should minimize noise pickup by keeping leads and traces short, especially for Pin 3 (Detect).