MC145017 Datasheet, PDF (1/8 Pages) Freescale Semiconductor, Inc – Low-Power CMOS Ionization Smoke Detector IC with Temporal Pattern Horn Driver

Freescale Semiconductor
Technical Data
MC145017
Rev 5, 05/2005
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
ORDERING INFORMATION
Device
Case No.
Package
MC145017P 648-08
Plastic Dip
MC145017
LOW-POWER CMOS IONIZATION
SMOKE DETECTOR IC WITH
TEMPORAL PATTERN
HORN DRIVER
P SUFFIX
PLASTIC DIP
CASE 648-08
Detect
Comp. Out
1
N/C 2
Low V Set 3
Low V
Comp. Out
4
LED 5
V_DD 6
Timing
Resistor
7
Feedback ⁸
16 Guard Hi-Z
15 Detect Input
14 Guard Lo-Z
13 Sensitivity Set
12 Osc Capacitor
11 Silver
10 Brass
9 V_SS
Figure 1. . Pin Connections
© Freescale Semiconductor, Inc., 2005. All rights reserved.