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Freescale Semiconductor Electronic Components Datasheet

MC146012 Datasheet

Low Power CMOS Photoelectric Smoke Detector IC

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MC146012 pdf
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Freescale Semiconductor
Technical Data
Document Number: MC146012
Rev 0, 09/2005
Low Power CMOS Photoelectric
Smoke Detector IC
MC146012
The MC146012 is an advanced smoke detector component containing
sophisticated very-low power analog and digital circuitry. The IC, when used with
an infrared photoelectric chamber and a small number of external components,
will detect smoke by sensing scattered light from smoke particles. When
detection occurs, a pulsating alarm is sounded via on-chip push-pull drivers and
an external piezoelectric transducer.
The MC146012 provides both audible and visual alarms. Upon sensing a
normal smoke level, both alarms will be activated. It is possible to mute the
audible alarm for approximately eight minutes through the Integrated Mute
Function (IMF), although the LED will continue to flash at a high rate. This feature
is resetable through a pushbutton test. The IMF feature will be overridden by
remote smoke, high smoke level, timeout or reset.
The Alarm memory feature will allow for identification of an alarming detector.
Through a pushbutton test, the LED will flash rapidly if there was a previous
alarm condition detected at the unit.
The variable-gain photo amplifier allows direct interface to IR detector
(photodiode). The gain settings are determined by external capacitors and
compensation resistors. A two stage speed-up is incorporated into the smoke
monitor to minimize time and help reduce false triggering. Further reduction of
false triggering is also addressed with the double sample chamber sensitivity and
double I/O sample.
LOW POWER CMOS
PHOTOELECTRIC SMOKE
DETECTOR IC
16
1
ED SUFFIX
PLASTIC DIP
CASE 648-08
16
Features
1
• Integrated Mute Function (IMF) to Temporarily Disable Horn
• Alarm Memory to Help Identify Alarming Unit
www.DataSheet4U.com• Speed-Up Sampling Rate After First Detection of Smoke
EG SUFFIX
SOG PACKAGE
CASE 751G-04
• Double Sample for Degraded Chamber Sensitivity Monitor
• Digital Noise Filter on the I/O Pin
• Power-Up and Power-Down RESET
• Low-Battery Trip Point Set Externally
• Temporal Horn Pattern
• Operating Temperature: -10 to 75°C
• Operating Voltage Range: 6.0 to 12 V
• Average Supply Current: 6.5 µA
Device
MC146012ED
MC146012EG
ORDERING INFORMATION
Temp. Range
Case No.
-10 to 75°C
648-08
-10 to 75°C
751G-04
Package
Plastic Dip
SOG Package
© Freescale Semiconductor, Inc., 2005. All rights reserved.
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Freescale Semiconductor Electronic Components Datasheet

MC146012 Datasheet

Low Power CMOS Photoelectric Smoke Detector IC

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MC146012 pdf
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DETECT 3
OSC 12
R1 13
TEST 16
OSC
4
STROBE
LOW-SUPPLY 15
TRIP
C1 C2
12
AMP -
VDD - 3.5 V
VDD - 4.0 V
REF
COMP
+
GATE
ON/OFF
TIMING
LOGIC
GATE
ON/OFF
VDD - 5.0 V
REF
SMOKE
ALARM,
MUTE,
& RESET
LOGIC
HORN MODULATOR
AND DRIVER
-
COMP
+
PIN 5 = VDD
PIN 14 = VSS
7
I/O
8 BRASS
9 SILVER
10 FEEDBACK
6 IRED
11 LED
Figure 1. Block Diagram
C1 1
16 TEST/MUTE
C2 2
15
LOW-SUPPLY
TRIP
www.DataSheet4U.comDETECT
STROBE
3
4
14 VSS
13 R1
VDD 5
12 OSC
IRED 6
11 LED
I/O 7
10 FEEDBACK
BRASS 8
9 SILVER
Figure 2. Pin Assignment (16-Pin DIP)
MC146012
2
Sensors
Freescale Semiconductor
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Freescale Semiconductor Electronic Components Datasheet

MC146012 Datasheet

Low Power CMOS Photoelectric Smoke Detector IC

No Preview Available !

MC146012 pdf
www.DataSheet4U.com
Table 1. Maximum Ratings(1) (Voltages Referenced to VSS)
Symbol
Parameter
Value
Unit
VDD DC Supply Voltage
VIN DC Input Voltage
IIN
IOUT
IDD
PD
DC Input Current, per Pin
DC Output Current, per Pin
DC Supply Current, VDD/VSS pins
(15 Seconds in Reverse Dir.)
Power Dissipation
C1, C2, Detect
Osc, Low-Supply Trip
I/O
Feedback
Test
† in Stil Air, 5 sec.
†† Continuous
-0.5 to +12
-0.25 to VDD +0.25
-0.25 to VDD +0.25
-0.25 to VDD +10
-15 to +25
-1.0 to VDD +0.25
±10
±25
+25 Forward
-150 Reverse
1200(2)
350(3)
V
V
mA
mA
mA
mW
Tstg Storage Temperature
TA Operating Temperature
TL Lead Temperature, 1 mm from case for 10 seconds
-55 to +125
-25 to +75
260
°C
°C
°C
1. Maximum ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the limits in
the electrical characteristics tables.
2. Derating: -12 mW/°C from 25°C to 60°C.
3. Derating: -3.5 mW/°C from 25°C to 60°C.
This device contains protection circuitry to guard against
damage due to high static voltages or electric fields.
However, precautions must be taken to avoid applications of
VOUT) VDD except for I/O pin which can exceed VDD, and
the Test/Mute input, which can go below VSS.
Unused inputs must always be tied to an appropriate logic
voltages any higher than maximum rated voltages to this
voltage level (e.g. either VSS or VDD). Unused outputs and/or
high-impedance circuit. For proper operation, VIN and VOUT
www.DataSheet4U.comshould be constrained to a range of VSS (VIN or
an unused I/O must be left open.
Table 2. Electrical Characteristics (Voltages Referenced to VSS, TA = -10 to 60°C unless otherwise indicated.)
Symbol
Parameter
Test Condition
Test
Pin
VDD
Min
Max
VDD Power Supply Voltage Range
— — 6.0
VTH Supply Threshold Voltage, Low Supply Alarm
Low Supply Trip: VIN = VDD/3
15
7.2
IDD Average Operating Supply Current
(per Package)
(Does not include Current through D3-IR Emitter)
Standby
Configured per Figure 5
— 12 —
— 9.0 —
12
7.8
9.0
7.0
IDD Peak Supply Current (per Package)
During Strobe On, IRED Off
12
1.25
(Does not include IRED Current into base of Q1) Configured per Figure 5
During Strobe On, IRED On
12
2.5
Configured per Figure 5
VIL Low Level Input Voltage
I/O
Feedback
Test
7.0 9.0
10 9.0
16 9.0
1.5
2.7
0.5
VIM Mid Level Input Voltage
VIH High Level Input Voltage
Test
I/O
Feedback
Test
16 9.0 2.0 VDD-2.0
7.0 9.0 3.2
10 9.0 6.3
16 9.0 8.5
IIN Input Current
IIL Test Mode Input Current
OSC, Detect
Low-Supply Trip
Feedback
Test
VIN = VSS or VDD
VIN = VSS or VDD
VIN = VSS or VDD
VIN = VSS or VDD
VIN = VSS or VDD
3.12 12 -100 +100
15 12 -100 +100
10 12 -100 +100
16 12 -100 +100
16
12 -100
-1.0
Unit
V
V
µA
mA
V
V
V
nA
µA
Sensors
Freescale Semiconductor
MC146012
3
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Part Number MC146012
Description Low Power CMOS Photoelectric Smoke Detector IC
Maker Freescale Semiconductor
Total Page 18 Pages
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