2010 Microchip Technology Inc. DS22245A-page 1
RE46C162/163
Features
• Pin Selectable Horn Patterns
• Alarm Memory
• Sensitivity Control Timer:
- 8 minute Timer for RE46C162
- 1 minute Timer for RE46C163
• >1500V ESD Protection (HBM) on All Pins
• Guard Outputs for Ion Detector Input
• ±0.75 pA Detect Input Current
• Internal Reverse Battery Protection
• Low Quiescent Current Consumption (<6.5 µA)
• I/O Filter and Charge Dump
• Internal Low Battery Detection
• Power-up Low Battery Test
• Interconnect up to 66 Detectors
• RoHS Compliant, Lead Free Packaging
Description
The RE46C162/163 devices are low-power, CMOS
ionization type, smoke detector ICs. With few external
components, these circuits will provide all the required
features for an ionization type smoke detector.
An internal oscillator strobes power to the smoke
detection circuitry for 10.5 ms every 1.67 seconds to
keep standby current to a minimum. A check for a low
battery condition is performed every 40 seconds when
in standby. The temporal horn pattern supports the
NFPA 72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected so when one unit alarms, all units will sound.
A charge dump feature will quickly discharge the inter-
connect line when exiting a local alarm. The intercon-
nect input is also digitally filtered.
An internal timer allows for a single button, push-to-test
to be used for a reduced sensitivity mode.
An alarm memory feature allows the user to determine
if the unit has previously entered a local alarm
condition.
Utilizing low-power CMOS technology, the
RE46C162/163 devices are designed for use in smoke
detectors that comply with Underwriters Laboratory
Specification UL217 and UL268.
Package Types
RE46C162/163
PDIP
TSTART 1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IO
TONE
TSTROBE
LED
V
DD
RBIAS
FEED
GUARD2
DETECT
GUARD1
VSEN
OSCAP
HS
HB
V
SS
CMOS Ionization Smoke Detector ASIC with Interconnect,
Timer Mode and Alarm Memory
