RE46C162E MICROCHIP [Microchip Technology], RE46C162E Datasheet - Page 12

• Manufacturer Part Number: RE46C162E
• Description: CMOS Ionization Smoke Detector ASIC with Interconnect, Timer Mode and Alarm Memory
• Manufacturer: MICROCHIP [Microchip Technology]

RE46C162/163
3.8
If a detector has entered a local alarm, once it exits the
local alarm, the alarm memory latch is set. Initially the
LED can be used to visually identify any unit that had
previously been in a local alarm condition. The LED will
flash 3 times spaced 3.3 seconds apart. This pattern
will repeat every 40 seconds. The duration of the flash
is 10.5 ms. In order to conserve battery power, this
visual indication will stop after a period of 24 hours. The
user will still be able to identify a unit with an active
alarm memory by pressing the push-to-test button.
When the push-to-test button is active, the horn will
chirp for 10.5 ms every 250 ms.
If the alarm memory condition is set, any time the push-
to-test button is pressed and then released, the alarm
memory latch is reset.
FIGURE 3-1:
DS22245A-page 12
Oscillator
Inte rnal Clock
LED
Sample Smoke
Horn
IO (Pin 2) as Output
IO Charge Dump
IO ( Pin 2) a s Input
Horn
Inte rnal Clock
Note s:
1. Smoke is not sampled when the ho rn is active. Horn cycle is self completing in local alarm.
2. L ow battery warnin g chirp is suppressed in local or re mote alarm
3. IO Dump active on ly in loca l alarm, inactive if external alarm
Complete Temporal Horn Pattern
Non -Temporal Horn Pattern
Start of horn tem poral pattern is not sy nc hroniz ed to an ex ternal alarm
Alarm Memory
Standby Mode; No Low Bat tery; No Alarm
P in 15 > Pin 13
T
24 Cloc k Cyc les (40 S)
PER1
Timing Diagram – Standby, Local Alarm, Low Battery.
T
IOFILT
T
T
HON1
PW
Timing not same scale as above
T
HOF1
T
HON3
T
HOF3
24 Cloc k Cy cles (1S)
See F igure Below for C omplete Horn Cycle
T
IODLY2
Pin 13 > Pin 15; 130mV Level Shift on P in 13
T
HOF2
T
T
Alarm; No Low Battery
IODLY1
PER2
The initial 24 hour visual indication is not displayed if a
low battery condition exits.
3.9
The TONE pin selects the NFPA72 temporal horn tone
(high), or the 2/3 duty cycle continuous tone (low). If
this pin is externally connected high, use a current
limiting resistor of at least 1.5K from TONE pin to V
3.10
The RE46C162/163 internally limits the current from
V
If an input is connected to V
through a resistance of at least 1.5K to limit the reverse
current through this path.
SS
Horn pattern not self completing for external alarm,s ee timing below for complete horn c ycle
to V
LED supress ed in remote alarm mode
DD
Alarm; Low Battery
Tone Select
Reverse Battery Protection
in the event of accidental polarity reversal.
Pin 15 > Pin 13
T
IODMP
 2010 Microchip Technology Inc.
No Alarm; Low Battery
DD
Low Battery Warning Chirp
it should be done
DD
.