M75018 [ETC]
IONIZATION SMOKE DETECTOR WITH INTERCONNECT; 与互连电离烟雾探测器
| 型号： | M75018 |
| 厂家： | 
ETC |
| 描述： | IONIZATION SMOKE DETECTOR WITH INTERCONNECT |
| 文件： | 总6页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
WITH INTERCONNECT
M75018
GENERAL DESCRIPTION
The M75018 is a low-current CMOS circuit providing all of the required features for an ionization-type smoke detector. A
networking capability allows as many as 40 units to be interconnected so that if any unit senses smoke, all units will sound an
alarm. In addition, special features are incorporated to facilitate alignment and test of the finished smoke detector. can be used in
numerous other battery-operated safety/security applications.
FEATURES
‧Piezoelectric Horn driver.
‧Guard outputs on both sides of detect Input.
‧Low-battery trip point, internally set , can be altered via external resistor.
‧Detect threshold, internally set , can be altered via external resistor.
‧Pulse testing for low-battery uses LED for battery loading.
‧Comparators output for detect.
‧Strobe output for external trim resistors.
‧I/O Pin allows up to 40 units to be connected for common signaling.
‧Power-on reset places IC in standby mode.
PIN ASSIGNMENT
M75018P
1
16
GUARD 2
DECTOR IN
GUARD 1
SEN_SET
OSC_CAP.
HORN2
DET_COMP
I/O
LOW-V SET
STROBE OUT
LED
VDD
TIME_RES
HORN1
VSS
8
9
FEED BACK
1/6
2007-07-27
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
WITH INTERCONNECT
M75018
PIN AND CIRCUIT DESCRIPTION
Pin No
Pin Name
I/O
Function
1
DET_COMP
O This pin provide a method of measuring the detect signal.
To allow multiple smoke detectors to be command. If any single unit detect smoke (I/O is
driven high), all connected units will sound their associated horns. The Led is suppressed
I/O when an alarm is signaled from an interconnected unit. An internal NMOS device acts as a
charge dump to aid in applications involving a large (distributed) capacitance on pin 2. The
charge dump is activated only on the removal of a local alarm.
2
I/O
The low battery threshold is set internally by a voltage divider connected between VDD and
VSS. The threshold can be increased by connecting a resistor to VDD. The threshold can be
3
4
LOW-V SET
I
decreased by connecting a resistor to VSS. It will be a slight interaction here due the
common voltage divider network. The battery voltage level is checked every 40 seconds
during the 10mA, battery loading remains at 10 mA.10ms LED pulse.
STROBE OUT
I
The detector sensitivity can be decreased by connecting a resistor to pin 13.
The 9 Volt battery level is checked every 40 seconds during the LED pulse. The battery is
loaded via a 10mA pulse for 11.6 ms.
5
6
LED
O
VDD
─ Power supply
A resistor between this pin and VDD is part of the oscillator and sets the capacitor charge
and discharge current（default 8.2MΩ）.
7
TIME_RES.
I
This pin input to the feedback electrode. If the FEEDBACK pin is not used, it must be
connected to VDD or VSS.
8
9
FEEDBACK
VSS
I
─ Ground
These two pins are used in conjunction with external passive components and a self-
resonating piezoelectric transducer. HORN1 is connected to the piezo metal support
electrode; the complementary output, HORN2, is connected to the ceramic electrode. A
continuous modulated tone indicates either a local or remote alarm condition. A short (10ms)
chirp indicates a low-battery chirp occurs almost simultaneous with the visible LED flash.
10 HORN1
O
O
I
11 HORN2
A capacitor between this pin and VSS is part of the oscillator and sets charge and discharge
time (default 0.1μF).
12 OSC_CAP.
The detector sensitivity to smoke is set internally by a voltage divider connected between
VDD and VSS The sensitivity can be externally adjusted to the individual characteristics of
the ionization chamber by connecting a resistor between pin13 and VDD, or between pin 13
and VSS. It will be a slight interaction here due the common voltage divider network.
.
13 SEN_SET
I
This will keep surface leakage currents to a minimum and provide a method of measuring the
input voltage without loading the ionization chamber.
14 GUARD1
I
I
15 DECTOR IN
This pin is the ionization-type smoke detector input.
The voltage at these pins will be within 100mV of the input signal. This will keep surface
leakage currents to a minimum and provide a method of measuring the input voltage without
loading the ionization chamber.
16 GUARD2
I
2/6
2007-07-27
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
WITH INTERCONNECT
M75018
ABSOLUTE MAXIMUM RATING
Sym.
VDD
VIN
IIN
Parameter
Supply Voltage Range
Input Voltage Range
Rating
-0.5 ~ 13
-0.3 to VDD +0.3
10
Unit
V
V
Input Current
mA
℃
TA
Operating Temperature Range
Storage Temperature Range
-10 ~ 60
TS
℃
-35 ~ 125
DC ELECTRICAL CHARACTERISTICS
(Voltage referenced to Vss , TA=25℃)
Characteristics
Operating Voltage
Sym.
VDD
VDD
─
Min.
6.0
6.3
8.5
─
Typ.
Max.
12
Unit
Conditions
─
─
8.8
─
0.1
─
─
─
5.0
─
─
─
─
─
50
100
─
─
─
5.0
─
─
─
V
V
─
7.2
9.0
7.2
9.0
7.2
9.0
9.0
9.0
12.0
9.0
9.0
─
Piezoelectric Horn Drivers (IOH = -16 mA)
Comparators (IOH = -30μA)
Piezoelectric Horn Drivers (IOL = +16 mA)
Comparators (IOL = +30μA)
Led Driver (IOL =10 mA)
Pin 14
VOH
VOL
─
V
Output Voltage
0.9
V
─
0.5
V
─
VOL
Lo-Z
Hi-Z
3.0
V
─
KΩ
KΩ
μA
μA
pA
μA
10
Output Impedance, Active Guard
Operating Current
─
1000
9.0
Pin 16
─
RBIAS =8.2 MΩ
IDD
─
12.0
±1.0
±0.1
±6.0
7.8
─
Detect ( 40% R.H. )
Pin 8
─
Input Current
IIN
─
pA @50℃, Pin 15
Low Battery
VLOW
VSET
VHYS
9.0
─
7.2
47
V
Internal Set Voltage
Hysteresis
53
%VDD Sensitivity
mV
9.0
9.0
9.0
─
75
─
150
±100
±50
VDD+10
─
mV Active Guard
mV Detect Comparator
Offset Voltage
(measure at Vin=VDD/2)
Vos
─
Input Voltage Range
VIN
CIN
VCM
IIH
Vss-10
─
V
pF
Pin 8
─
Input Capacitance
─
Common Mode Voltage Range
0.6
25
VDD-2
100
-25
V
Pin 15
─
μA
Input , VIH = VDD-2 ( Pin 2 )
I/O Current
─
IOH
-10
mA Output , IOH = VDD-2 ( Pin 2 )
TIMING PARAMETERS
( C=0.1μF, RBIAS = 8.2MΩ, VDD = 9.0V , TA=25℃)
Characteristics
Sym.
Min.
1.46
37.5
10.1
450
Max
1.85
45.8
12.3
550
Unit
s
No Smoke
Smoke
Oscillator Period
tCI
ms
ms
ms
ms
s
Oscillator Rise Time
tr
On Time
Off Time
Between
On Time
On Time
Off Time
PWon
PWoff
tLED
PWon
ton
Horn Output ( During Smoke )
450
550
35.0
10.1
10.1
35.0
44.5
12.3
12.3
44.5
LED Output Pulses
ms
ms
s
Horn Output Pulses ( During Low Battery )
toff
3/6
2007-07-27
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
M75018
WITH INTERCONNECT
TIMING DIAGRAM
STANDBY
NO SMOKE /
SMOKE
NO LOW BATTERY
LOW BATTERY
NO SMOKE / LOW BATTERY
10ms 1.67s
SMOKE / NO LOW BATTERY
40ms
OSC
(PIN 12)
DETECT OUT
(PIN 1)
LOW BATTERY
(INTERNAL)
HYSTERESIS (INTERNAL)
(PIN 13)
(PIN 14)
LOW = DISABLE
HIGH = ENABLE
HORN
LOW BATTERY CHIRP
(Note1)
(PIN 10 & 11)
BATTERY TEST
SUPPRESSED CHIRP
(Note3)
LED
(PIN 5)
(Note3)
24 CLOCK CYCLES
(40S)
6 CLOCK CYCLES
(10.0s)
24 CLOCK CYCLES (0.96s)
24 CLOCK CYCLES
STROBE OUT
(PIN 4)
I/O (PIN2)
OUTPUT (LOCAL)
I/O (PIN2)
INPUT (REMOTE)
LED
(SUPPRESSED LED FOR REMOTE ONLY)
Notes：
1. Horn modulation is self-completing. When going from smoke to no smoke , the alarm condition will terminate only when
horn is off.
2. Comparators are strobed on once per clock cycle (1.67s for no smoke , 40 ms for smoke ).
3. Low battery comparator information is latched only during LED pulse.
4/6
2007-07-27
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
WITH INTERCONNECT
M75018
BLOCK DIAGRAM
VDD
I/O
2
FEEDBACK
6
8
40K
LOW BATTERY
COMPARATOR
HORN 2
HORN 1
11
10
-
3
1
LOW-V SET
ALARM
DETECT COMP. OUT
LOGIC
280K
DETECT
COMPARATOR
SENSITIVITY SET
13
-
POWER-ON
RESET
320K
GUARD
AMP
4
STROBE OUT
VDD
5
OSCILLATOR
& TIMING
LED
15
DETECT INPUT
-
14
16
GUARD1
GUARD2
12
OSC CAP.
9
7
GND
TIME RES.
5/6
2007-07-27
一華半導體股份有限公司
SMOKE DETECTOR
MOSDESIGN SEMICONDUCTOR CORP.
IONIZATION SMOKE DETECTOR
WITH INTERCONNECT
M75018
APPLICATION DIAGRAM
VDD = 9V
1MΩ
1MΩ
TEST
M75018P
DET_COMP
I/O
GUARD 2
DECTOR IN
GUARD 1
1
16
TO OTHER UNITS
LOW-V SET
STROBE OUT
SEN_SET
OSC_CAP.
LED
330Ω
VDD
HORN2
HORN1
0.1uF
TIME_RES.
8.2MΩ
FEED BACK
VSS
8
9
0.1uF
0.001uF
220KΩ
1.5MΩ
* All specs and applications shown above subject to change without prior notice.
(以上電路及規格僅供參考,本公司得逕行修正)
6/6
2007-07-27
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