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Freescale Semiconductor Electronic Components Datasheet

MC145010 Datasheet

Photoelectric Smoke Detector IC

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MC145010 pdf
Freescale Semiconductor
Technical Data
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 VSS, 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 VDD 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.
Device
MC145010P
MC145010ED
MC145010DW
MCZ145010EG/EGR2
ORDERING INFORMATION
Temp. Range
Case No.
-55 to +125°C
648-08
751G-04
Package
16 Lead Plastic Dip
16 Lead SOICW
MC145010
Rev 7.0, 05/2006
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
C1 1
C2 2
Detect 3
Strobe
VDD
IRED
I/O
Brass
4
5
6
7
8
16 Test
15
Low-Supply
Trip
14 VSS
13 R1
12 OSC
11 LED
10 Feedback
9 Silver
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2006. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MC145010 Datasheet

Photoelectric Smoke Detector IC

No Preview Available !

MC145010 pdf
Detect 3
OSC
R1
Test
12 OSC
13
16
Strobe
Low-supply
Trip
4
15
C1 C2
12
AMP
VDD - 3.5 V
REF
Gate
On/off
Timing
Logic
Gate
On/off
-
Comp
+
VDD - 5.0
VREF
Smoke
-
Comp
+
Alarm
Logic
Horn Modulator
And Driver
PIN 5 = VDD
PIN 14 = VSS
7 I/O
8 Brass
9 Silver
10 Feedback
6 IRED
11 LED
Figure 2. Block Diagram
Table 1. Maximum Ratings(1)
(Voltages referenced to VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
DC Input Voltage
C1, C2, Detect
OSC, Low-Supply Trip
I/O
Feedback
Test
DC Input Current per Pin
DC Output Current per Pin
DC Supply Current, VDD and VSS Pins
Power Dissipation in Still Air
5 Seconds
Continuous
VDD
VIN
IIN
IOUT
IDD
PD
-0.5 to +15
-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 / -150
1200(2)
350(3)
V
V
mA
mA
mA
mW
Storage Temperature Range
Lead Temperature, 1 mm From Case for 10 Seconds
TSTG
TL
-55 to +125
5.0
°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° to 60°C.
3. Derating -3.5 mW/°C from 25° to 60°C.
This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised normal
precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit. For proper
operation, it is recommended VIN and VOUT be constrained to the range VSS (VIN or VOUT) VDD.
MC145010
2
Sensors
Freescale Semiconductor


Part Number MC145010
Description Photoelectric Smoke Detector IC
Maker Freescale Semiconductor
Total Page 12 Pages
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