MC145011 Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
componentes Descripción
Fabricante
MC145011 Datasheet PDF : 12 Pages
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MC145011
C1
0.047 µF
1 TO 22 µF +
SW1
C4**
C2*
V+
4700 pF
1
C1
R14
R8
560 Ω
8.2 k
2 C2
R9†
R11ă250 k
5k
3 DETECT
R10
D1
4.7 k
IR DETECTOR
4
STROBE
R12
1k
C5 +
100 µF
D2
IR EMITTER
5
VDD
Q1
6
IRED
IR R13*
CURRENT 4.7 TO 22
TO OTHER
MC145011(s),
ESCAPE LIGHT(S),
AUXILIARY ALARM(S),
REMOTE ALARM(S),
AND/OR AUTO-DIALER
7 I/O
8 BRASS
16
TEST
LOW-SUPPLY 15
TRIP
MC145011
14
VSS
13
R1
OSC 12
11
LED
FEEDBACK 10
SILVER 9
PUSHBUTTON
TEST
R6
100 k
R7
47 k
R1
100 k
C3
1500 pF
R2
10 M
R3
470
R4H
100 k
0.01 µF
C6H
2.2 M
R5H
D3
VISIBLE
LED
HORN
X1
H Values for R4, R5, and C6 may differ depending on type of piezoelectric horn used.
* C2 and R13 are used for coarse sensitivity adjustment. Typical values are shown.
† R9 is for fine sensitivity adjustment (optional). If fixed resistors are used, R8 = 12 k, R10 is 5.6 k to 10 k, and R9 is eliminated. When R9
is used, noise pickup is increased due to antenna effects. Shielding may be required.
** C4 should be 22 µF if supply line resistance is high (up to 50 Ω). C4 could be reduced to 1 µF when supply line resistance is < 30 Ω.
Figure 5. Typical Application
PIN DESCRIPTIONS
C1 (Pin 1)
A capacitor connected to this pin as shown in Figure 5
determines the gain of the on–chip photo amplifier during
pushbutton test and chamber sensitivity test (high gain). The
capacitor value is chosen such that the alarm is tripped from
background reflections in the chamber during pushbutton
test.
Av ≈ 1 + (C1/10) where C1 is in pF. CAUTION: The value
of the closed–loop gain should not exceed 10,000.
C2 (Pin 2)
A capacitor connected to this pin as shown in Figure 5
determines the gain of the on–chip photo amplifier except
during pushbutton or chamber sensitivity tests.
Av ≈ 1 + (C2/10) where C2 is in pF. This gain increases
about 10% during the IRED pulse, after two consecutive
local smoke detections.
Resistor R14 must be installed in series with C2. R14 ≈
[1/(12√C2)] – 680 where R14 is in ohms and C2 is in farads.
DETECT (Pin 3)
This input to the high–gain pulse amplifier is tied to the
cathode of an external photodiode. The photodiode should
have low capacitance and low dark leakage current. The
diode must be shunted by a load resistor and is operated at
zero bias.
The Detect input must be ac/dc decoupled from all other
signals, VDD, and VSS. Lead length and/or foil traces to this
pin must be minimized, also. See Figure 6.
STROBE (Pin 4)
This output provides a strobed, regulated voltage refer-
enced to VDD. The temperature coefficient of this voltage is
± 0.2%/°C maximum from – 10° to 60°C. The supply–voltage
coefficient (line regulation) is ± 0.2%/V maximum from 6 to
12 V. Strobe is tied to external resistor string R8, R9, and
R10.
8
Motorola Sensor Device Data
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