MC145018 Datasheet, PDF (1/8 Pages) Motorola, Inc – LONIZATION SMOKE DETECTOR IC WITH INTERCONNECT AND TEMPORAL HORN DRIVER

Freescale Semiconductor
Technical Data
MC145018
Rev 4, 05/2005
Low-Power CMOS
Ionization Smoke Detector IC with
Interconnect and Temporal
Horn Driver
The MC145018, 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-Protection 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 Output for Detect
• Internal Reverse Battery Protection
• Strobe Output for External Trim Resistors
• I/O Pin Allows Up to 40 Units to be Connected for Common Signaling
• Supports NFPA 72, ANSi 53.41, and ISO 8201
Audible Emergency Evacuation Signals
• Power-On Reset Places IC in Standby Mode
ORDERING INFORMATION
Device
Case No.
MC145018P
648-08
Package
Plastic Dip
MC145018
IONIZATION SMOKE DETECTOR
IC WITH INTERCONNECT AND
TEMPORAL HORN DRIVER
P SUFFIX
PLASTIC DIP
CASE 648-08
Detect
Comp. Out ¹
I/O 2
Low V Set 3
Strobe 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 Assignment
© Freescale Semiconductor, Inc., 2005. All rights reserved.