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參數(shù)資料
| 型號： | RE46C180S16TF |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 19/58頁 |
| 文件大?。?/td> | 851K |
| 描述： | IC ION SMOKE DETECT ASIC 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,600 |
| 系列： | * |
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?2011 Microchip Technology Inc.
DS22275A-page 19
RE46C180
FIGURE 4-1:
Nominal Application Circuit for Programming.
4.2
Smoke Calibration
A separate calibration mode is entered for each mea-
surement mode (Normal, Hysteresis, HUSH and
PTT/Chamber Test) so that independent limits can be
set for each.
In all calibration modes the V
SEN
voltage, which repre-
sents the smoke sensitivity level, can be accessed at
T3 output. The SmkCompOut output voltage is the
result of the comparison of DETECT and V
SEN
, and
can be accessed at TESTOUT output. The FEED input
can be clocked to cycle through the available smoke
sensitivity levels. Once the desired smoke sensitivity
level is reached, the IO input is pulsed low to high to
store the result.
The detailed procedure is described in the following
steps:
1. Power up with the bias condition shown in
Figure 4-1. At power-up:
TEST = IO = FEED = T2 = V
SS
,
DETECT = V
DD
. Now in mode M0.
2. Drive T2 input from V
SS
to V
DD
and hold at V
DD
to enter TM0.
3. Drive TEST from V
SS
to V
DD
and hold at V
DD
.
4. Apply four clock pulses to the T2 input (V
DD
to
V
SS
and back to V
DD
) to enter in TM4 mode.
This initiates the Calibration mode for the normal
sensitivity setting. Drive TEST from V
DD
to V
SS
to turn on the smoke comparator and enable the
T3 switch. The standby smoke sensitivity V
SEN
will appear at T3. The smoke comparator output
will appear at TESTOUT. Clock FEED to
increase or decrease the V
SEN
levels as
needed. The IO input is pulsed low-to-high to
save the result.
5. Drive TEST from V
SS
to V
DD
and hold at V
DD
.
Apply another clock pulse to the T2 input, to
enter in TM5 mode. This initiates the Calibration
mode for the hysteresis setting. Drive TEST
from V
DD
to V
SS
to turn on the smoke compara-
tor and enable the T3 switch. The local alarm
smoke sensitivity V
SEN
will appear at T3. The
smoke comparator output will appear at TES-
TOUT. Clock FEED to increase or decrease the
V
SEN
levels as needed. The IO input is pulsed
low-to-high to save the result.
V
Battery
+
-
R1
1
k
TEST
IO
GLED
CHAMBER
RLED
DD
TESTOUT
FEED
GUARD2
DETECT
T3
T2
HS
HB
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
RE46C180
R2
1
k
V1
V2 V3 V4
V5
V6
Monitor TESTOUT,
T3 and CHAMBER
GUARD1
V
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