參數(shù)資料
型號(hào)： RE46C180S16TF
廠商： Microchip Technology
文件頁(yè)數(shù)： 11/58頁(yè)
文件大小： 851K
描述： IC ION SMOKE DETECT ASIC 16SOIC
標(biāo)準(zhǔn)包裝： 2,600
系列： *
?2011 Microchip Technology Inc.
DS22275A-page 11
RE46C180
3.0
DEVICE DESCRIPTIONS
3.1
Standby Internal Timing
The internal oscillator is manufactured to ?% toler-
ance. The oscillator period, TPOSC, is 625 祍. The inter-
nal clock period, TPCLK, of 10 ms is derived from the
internal oscillator period.
In Standby, once every 10s, the smoke detection cir-
cuitry is powered on for 5 ms. At the conclusion of the
5 ms, the status of the smoke comparator is latched. If
a Smoke condition is present, the period to the next
detection decreases and additional checks are made.
In Standby, once every 80s, the Low Battery detection
circuitry is powered on for 10 ms. At the conclusion of
the 10 ms, the status of the Low Battery comparator is
latched. RLED is enabled for 10 ms every 320s to
provide a battery load in the loaded battery test.
In Standby, once every 320s, the chamber test circuitry
is powered on for 5 ms. At the conclusion of the 5 ms,
the status   of   the   chamber   test   is   latched.   See
Section 3.3 Supervisory Tests for details.
3.2
Smoke Detection Circuitry
The collection electrode voltage (CEV) of the ionization
chamber is compared to the stored reference voltage at
the conclusion of the 5 ms smoke sample period. After
the first Smoke condition is detected, the smoke detec-
tion rate increases to once every 1s. Three consecutive
smoke detections will cause the device to go into Local
Alarm, and the horn circuit and IO will be active. RLED
will turn on for 10 ms at 1 Hz rate.
In Local Alarm, the smoke reference voltage (smoke
sensitivity) is internally increased to provide alarm
hysteresis.
There are three separate smoke sensitivity settings (all
user programmable):
"  Standby sensitivity
"  Local alarm (hysteresis) sensitivity
"  HUSH sensitivity
During PTT, the standby smoke sensitivity is used in
smoke detection; but the CHAMBER voltage is user
programmable.
The guard amplifier and outputs are always active, and
will be within 50 mV of the DETECT input to reduce
surface leakage. The guard outputs also allow for
measurement of the DETECT input without loading the
ionization chamber.
3.3
Supervisory Tests
Once every 80s, the status of the battery voltage is
checked by comparing a fraction of the V
DD
 voltage to
an internal reference. In each period of 320s, the bat-
tery is checked four times. Of these four battery
checks, three are unloaded and one is loaded with
RLED enabled, which provides a battery load. Low bat-
tery status is latched at the end of the 10 ms RLED
pulse.
If the Low Battery test fails, the horn will chirp for 10 ms
every 40s, and will continue to chirp until the next
loaded Low Battery check is passed. The unloaded
Low Battery checks are skipped in Low Battery
condition.
As a user programmable option, a Low Battery Hush
mode can be selected. If a Low Battery condition
exists, upon release of PTT, the unit will enter the Low
Battery Hush mode, and the 10 ms horn chirp will be
silenced for 8 hours. At the conclusion of the 8 hours
the audible indication will resume, if the Low Battery
condition still exists
In addition, every 320s, a background chamber test is
performed by internally lowering the CHAMBER volt-
age to a pre-determined level (user programmable) for
3.7s. This will emulate a Smoke condition. At the end of
this 3.7s period, the smoke detection circuitry is pow-
ered on for 5 ms, and the Smoke condition is detected.
If two consecutive chamber tests failed to detect a sim-
ulated Smoke condition, the chamber fail latch is set
and the failure warning is generated. The horn will chirp
three times every 40s. Each chirp is 10 ms long and
three chirps are spaced at a 0.5s interval. The chamber
fail warning chirp is separated from the Low Battery
warning chirp by about 20s.
The horn will continue this pattern until the chamber fail
latch is reset. The chamber fail latch resets when any
one of the followings is active:
"  Two consecutive chamber tests pass
"  Local smoke alarm
"  PTT smoke alarm
After the chamber test is completed, the CHAMBER
voltage goes back to its normal standby level.
Chamber test is performed approximately 140s after
the loaded Low Battery test.
In a Local Alarm, PTT Alarm or Remote Alarm condi-
tion, the chamber test is not performed, and the Low
Battery chirping is prohibited.
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