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PDF MC145017 Data sheet ( Hoja de datos )
| Número de pieza | MC145017 | |
| Descripción | Low-Power CMOS Ionization Smoke Detector IC | |
| Fabricantes | Freescale Semiconductor | |
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Technical Data
MC145017
Rev. 6.0, 3/2007
Low-Power CMOS
Ionization Smoke Detector IC
with Temporal Pattern Horn Driver
The MC145017, when used with an ionization chamber and a small number
of external components, will detect smoke. When smoke is sensed, an alarm is
sounded via an external piezoelectric transducer and internal drivers. This circuit
is designed to operate in smoke detector systems that comply with UL217 and
UL268 specifications.
Features
• Ionization Type with On-Chip FET Input Comparator
• Piezoelectric Horn Driver
• Guard Outputs on Both Sides of Detect Input
• Input-Production Diodes on the Detect Input
• Low-Battery Trip Point, Internally Set, can be Altered Via External Resistor
• Detect Threshold, Internally Set, can be Altered Via External Resistor
• Pulse Testing for Low Battery Uses LED for Battery Loading
• Comparator Outputs for Detect and Low Battery
• Internal Reverse Battery Protection
• Supports NFPA 72, ANSi 53.41, and ISO 8201 Audible Emergency
Evacuation Signals
• Pb-Free Packaging Designated by Suffix Code ED and EG
ORDERING INFORMATION
Device
Case No.
Package
MC145017P
MC145017ED
648-08
Plastic Dip
MCZ145017EG/R2 751G-04
SOICW
MC145017
LOW-POWER CMOS IONIZATION
SMOKE DETECTOR IC WITH
TEMPORAL PATTERN
HORN DRIVER
P SUFFIX
ED SUFFIX
(PB-FREE)
PLASTIC DIP
CASE 648-08
EG SUFFIX
(PB-FREE)
16-LEAD
SOICW
CASE 751G-04
DETECT COMP.
OUT
N/C
LOW V SET
LOW V COMP.
OUT
LED
VDD
TIMING
RESISTOR
FEEDBACK
1
2
3
4
5
6
7
8
16 GUARD Hi-Z
15 DETECT INPUT
14 GUARD LO-Z
13 SENSITIVITY SET
12 OSC CAPACITOR
11 SILVER
10 BRASS
9 VSS
DETECT
COMP. OUT
N/C
LOW V SET
LOW V
COMP. OUT
LED
VDD
TIMING
RESISTOR
FEEDBACK
1
2
3
4
5
6
7
8
16 GUARD HI-Z
15
DETECT
INPUT
14 GUARD LO-Z
13
SENSITIVITY
SET
12
OSC
CAPACITOR
11 SILVER
10 BRASS
9 VSS
Figure 1. . Pin Connections
Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to
permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
1 page  
battery, respectively. Pin 1 = VDD for smoke and Pin 4 = VDD
for low battery. In this mode and during the 10 ms power
strobe, chip current rises to approximately 50 µA.
Led Pulse
The 9-volt battery level is checked every 40 seconds
during the LED pulse. The battery is loaded via a 10 mA
pulse for 11.6 ms. If the LED is not used, it should be replaced
0.1 µF
330 Ω
8.2 MΩ
+
9V
1 16
MC145017
2 15
3 14
4 13
5 12
6 11
7 10
89
with an equivalent resistor such that the battery loading
remains at 10 mA.
Hysteresis
When smoke is detected, the resistor/divider network that
sets sensitivity is altered to increase sensitivity. This yields
approximately 100 mV of hysteresis and reduces false
triggering.
1M 1M
Test
0.1 µF
1.5 MΩ* 0.001 µF
220 kΩ*
OSC
Pin 12
Smoke - N
-Y
Low Bat - Y
-N
HYST
Pin 13
*NOTE: Component values may change depending on type of piezoelectric horn used.
Figure 6. Typical Application as Ionization Smoke Detector
1 23 45 67 8 9
23 24 1
6 12
18
No Smoke, Low Battery
No Smk
No Low Bat
Smoke
Latch Alarm Condition
( 100 mV Level Shift)
24 OSC
Pin 12
Smoke - N
-Y
No Smk
LOW BAT - Y
-N
HORN - On LOW BATTERY CHIRP >>
- Off
NFPA MOD >>
(Note 1)
LED - Off
- On
24 Clocks
24 Clocks
NOTES:
1. Horn modulation is self-completing. When going from smoke to no smoke, the alarm condition will terminate only when horn is off.
2. Comparators are strobed once per cycle (1.65 sec for no smoke, 40 msec for smoke).
Figure 7. MC145017 Timing Diagram
Sensors
Freescale Semiconductor
HORN - ON
- OFF
LED - OFF
- ON
MC145017
5
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| PDF Descargar | [ Datasheet MC145017.PDF ] | |
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