MC145010EG datasheet, PDF - EEWORLD Datasheet

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MC145010EG: DescriptionIC smoke detect photoelec 16soic; Categorysemiconductor Analog mixed-signal IC; File Size387KB，12 Pages; ManufacturerFREESCALE (NXP); Environmental Compliance

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IC smoke detect photoelec 16soic

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Freescale Semiconductor

Technical Data

MC145010

Rev 7.0, 05/2006

Photoelectric Smoke

Detector IC with I/O

The CMOS MC145010 is an advanced smoke detector component containing

sophisticated very-low-power analog and digital circuitry. The IC is used with an

infrared photoelectric chamber. Detection is accomplished by sensing scattered

light from minute smoke particles or other aerosols. When detection occurs, a

pulsating alarm is sounded via on-chip push-pull drivers and an external

piezoelectric transducer.

The variable-gain photo amplifier allows direct interface to IR detectors

(photodiodes). Two external capacitors, C1 and C2, C1 being the larger, determine

the gain settings. Low gain is selected by the IC during most of the standby state.

Medium gain is selected during a local-smoke condition. High gain is used during

push button test. During standby, the special monitor circuit which periodically

checks for degraded chamber sensitivity uses high gain, also.

The I/O pin, in combination with V

, can be used to interconnect up to 40 units

for common signaling. An on-chip current sink provides noise immunity when the I/

O is an input. A local-smoke condition activates the short-circuit-protected I/O

driver, thereby signaling remote smoke to the interconnected units. Additionally, the

I/O pin can be used to activate escape lights, enable auxiliary or remote alarms,

and/or initiate auto-dialers.

While in standby, the low-supply detection circuitry conducts periodic checks

using a pulsed load current from the LED pin. The trip point is set using two external

resistors. The supply for the MC145010 can be a 9 V battery.

A visible LED flash accompanying a pulsating audible alarm indicates a local-

smoke condition. A pulsating audible alarm with no LED flash indicates a remote-

smoke condition. A beep or chirp occurring virtually simultaneously with an LED

flash indicates a low-supply condition. A beep occurring half-way between LED

flashes indicates degraded chamber sensitivity. A low-supply condition does not

affect the smoke detection capability if V

≥

6 V. Therefore, the low-supply

condition and degraded chamber sensitivity can be further distinguished by

performing a push button (chamber) test.

Features

•

Circuit is designed to operate in smoke detector systems that comply with

UL217 and UL268 Specifications

Operating Voltage Range: 6 to 12 V

Operating Temperature Range: - 10 to 60°C

Average Supply Current: 12

µA

Power-On Reset Places IC in Standby Mode (Non-Alarm State)

Electrostatic Discharge (ESD) and Latch Up Protection Circuitry on All Pins

Chip Complexity: 2000 FETs, 12 NPNs, 16 Resistors, and 10 Capacitors

Ideal for battery powered applications.

ORDERING INFORMATION

Device

MC145010P

MC145010ED

MC145010DW

MCZ145010EG/EGR2

-55 to +125°C

751G-04

16 Lead SOICW

Temp. Range

Case No.

648-08

Package

16 Lead Plastic Dip

MC145010

PHOTOELECTRIC SMOKE

DETECTOR IC WITH I/O

P SUFFIX

ED SUFFIX (PB-FREE)

PLASTIC DIP

CASE 648-08

DW SUFFIX

EG SUFFIX (PB-FREE)

SOICW

CASE 751G-04

Detect

Strobe

IRED

I/O

Brass

Test

Low-Supply

Trip

OSC

LED

Feedback

Silver

Figure 1. Pin Connections

Table 4. Pin Description

Symbol

Description

A capacitor connected to this pin, shown in

Figure 8,

determines the gain of the on-chip photo amplifier during push button

test and chamber sensitivity test (high gain). The capacitor value is chosen such that the alarm is tripped from background

reflections in the chamber during push button test.

ª 1 + (C1/10) where C1 is in pF. CAUTION: The value of the closed-loop gain should not exceed 10,000.

A capacitor connected to this pin as shown in

Figure 8

determines the gain of the on-chip photo amplifier except during

push button or chamber sensitivity tests. A

≈

1 + (C2/10) where C2 is in pF. This gain increases about 10% during the

IRED pulse, after two consecutive local smoke detections.

Resistor R14 must be installed in series with C2. R14

≈

[1/(12√C2)] - 680 where R14 is in ohms and C2 is in farads.

DETECT This input to the high-gain pulse amplifier is tied to the cathode of an external photodiodes. The photodiodes should have

low capacitance and low dark leakage current. The diode must be shunted by a load resistor and is operated at zero bias.

The Detect input must be ac/dc decoupled from all other signals, V

, and V

. Lead length and/or foil traces to this pin

must be minimized, also. See

Figure 9.

STROBE This output provides a strobed, regulated voltage referenced to V

. The temperature coefficient of this voltage is

0.2%/

°C

maximum from - 10° to 60°C. The supply-voltage coefficient (line regulation) is

0.2%/V maximum from 6 to 12 V.

Strobe is tied to external resistor string R8, R9, and R10.

IRED

This pin is connected to the positive supply potential and may range from +6 to +12 V with respect to V

. CAUTION: In

battery-powered applications, reverse-polarity protection must be provided externally.

This output provides pulsed base current for external NPN transistor Q1 used as the infrared emitter driver. Q1 must have

β ≥

100. At 10 mA, the temperature coefficient of the output voltage is typically + 0.5%/°C from - 10° to 60°C. The supply-

voltage coefficient (line regulation) is

0.2%/V maximum from 6 to 12 V. The IRED pulse width (active-high) is determined

by external components R1 and C3. With a 100 kΩ/1500 pF combination, the nominal width is 105

µs.

To minimize noise

impact, IRED is not active when the visible LED and horn outputs are active. IRED is active near the end of Strobe pulses

for Smoke Tests, Chamber Sensitivity Test, and Push button Test.

This pin can be used to connect up to 40 units together in a wired-OR configuration for common signaling. V

is used as

the return. An on-chip current sink minimizes noise pick up during non-smoke conditions and eliminates the need for an

external pull-down resistor to complete the wired-OR. Remote units at lower supply voltages do not draw excessive current

from a sending unit at a higher supply voltage.

I/O can also be used to activate escape lights, auxiliary alarms, remote alarms, and/or auto-dialers.

As an input, this pin feeds a positive-edge-triggered flip-flop whose output is sampled nominally every 625 ms during

standby (using the recommended component values). A local-smoke condition or the push button-test mode forces this

current-limited output to source current. All input signals are ignored when I/O is sourcing current. I/O is disabled by the

on-chip power-on reset to eliminate nuisance signaling during battery changes or system power-up. If unused, I/O must

be left unconnected.

This half of the push-pull driver output is connected to the metal support electrode of a piezoelectric audio transducer and

to the horn-starting resistor. A continuous modulated tone from the transducer is a smoke alarm indicating either local or

remote smoke. A short beep or chirp is a trouble alarm indicating a low supply or degraded chamber sensitivity.

This half of the push-pull driver output is connected to the ceramic electrode of a piezoelectric transducer and to the horn-

starting capacitor.

I/O

BRASS

SILVER

FEEDBA This input is connected to both the feedback electrode of a self-resonating piezoelectric transducer and the horn-starting

resistor and capacitor through current-limiting resistor R4. If unused, this pin must be tied to V

or V

LED

This active-low open-drain output directly drives an external visible LED at the pulse rates indicated below. The pulse width

is equal to the OSC period.

The load for the low-supply test is applied by this output. This low-supply test is non-coincident with the smoke tests,

chamber sensitivity test, push button test, or any alarm signals.

The LED also provides a visual indication of the detector status as follows, assuming the component values shown in

Figure 8:

Standby (includes low-supply and chamber sensitivity tests) - Pulses every 43 seconds (nominal) Local Smoke

- Pulses every 0.67 seconds (nominal) Remote Smoke - No pulses

Push button Test - Pulses every 0.67 seconds (nominal)

This pin is used in conjunction with external resistor R2 (10 MΩ) to V

and external capacitor C3 (1500 pF) to V

form an oscillator with a nominal period of 10.5 ms.

This pin is used in conjunction with resistor R1 (100 kΩ) to pin 12 and C3 (1500 pF, see pin 12 description) to determine

the IRED pulse width. With this RC combination, the nominal pulse width is 105

µs.

This pin is the negative supply potential and the return for the I/O pin. Pin 14 is usually tied to ground.

OSC

VSS

LOW-

This pin is connected to an external voltage which determines the low-supply alarm threshold. The trip voltage is obtained

SUPPLY through a resistor divider connected between the V

and LED pins. The low-supply alarm threshold voltage (in volts)

≈

TRIP

(5R7/R6) + 5 where R6 and R7 are in the same units.

MC145010

Sensors

Freescale Semiconductor

MC145010EG Related Products

	MC145010EG	MC145010DW	MC145010ED	MC145010EGR2	MC145010P	MCZ145010EGR2	MCZ145010EG
Description	IC smoke detect photoelec 16soic	IC smoke detect with I/O 16soic	IC smoke detect photoelec 16-dip	IC smoke detect photoelec 16soic	IC smoke detect photoelec 16-dip	IC smoke detect photoelec 16soic	IC smoke detect photoelec 16soic

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