FREESCALE MC14467P-1

Freescale Semiconductor
Technical Data
MC14467-1
Rev 4, 05/2005
Low-Power CMOS
Ionization Smoke Detector IC
The MC14467-1, when used with an ionization chamber and a small number
of external components, will detect smoke. When smoke is sensed, an alarm is
sounded via an external piezoelectric transducer and internal drivers. This circuit
is designed to operate in smoke detector systems that comply with UL217 and
UL268 specifications.
MC14467-1
LOW-POWER CMOS
IONIZATION
SMOKE DETECTOR IC
Features
•
•
•
•
•
•
•
•
•
Ionization Type with On-Chip FET Input Comparator
Piezoelectric Horn Driver
Guard Outputs on Both Sides of Detect Input
Input-Production Diodes on the 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
Comparator Outputs for Detect and Low Battery
Internal Reverse Battery Protection
P SUFFIX
16-LEAD PLASTIC DIP
CASE 648-08
ORDERING INFORMATION
Device
Case No.
Package
MC14467P1
648-08
Plastic Dip
Detect
Comp. OUT
N/C
1
16
Guard Hi-z
2
15
Detect Input
Low V Set
3
14
Guard Lo-z
Low V
Comp. OUT
LED
4
13
Sensitivity Set
5
12
Osc Capacitor
VDD
6
11
Silver
Timing
Resistor
Feedback
7
10
Brass
8
9
VSS
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2005. All rights reserved.
VDD
Priezoelectric
Horn Driver
8
VDD
4
80 K
Low Battery Comp.
–
3
11
Latch
10
+
7
VDD
1045 K
Oscillator
Timer
12
VDD
5
13
+
Latch
–
15
1125 K
6
9
Led Driver
1
Detect Input
14
Lo-Z
VDD
+
–
Active
Guard
Figure 2. Block Diagram
Table 1. Maximum Ratings(1)
(Voltages referenced to VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
VDD
−0.5 to + 15
V
Input Voltage, All Inputs Except Pin 8
Vin
−0.25 to VDD + 0.25
V
DC Current Drain per Input Pin, Except Pin 15 = 1 mA
I
10
mA
DC Current Drain per Output Pin
I
30
mA
Operating Temperature Range
TA
−10 to +60
°C
Storage Temperature Range
Tstg
−55 to + 125
°C
Reverse Battery Time
tRB
5.0
s
1. Maximum Ratings are those values beyond which damage to the device may occur. This device contains circuitry to protect the inputs
against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid application of
any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation it is recommended that except for pin 8,
Vin and Vout be constrained to the range VSS ≤ (Vin or Vout ) VDD. For pin 8, refer to the Electrical Characteristics.
MC14467-1
2
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Freescale Semiconductor
Table 2. Recommended Operating Conditions
(Voltages referenced to VSS)
Parameter
Supply Voltage
Symbol
Value
Unit
VDD
9.0
V
Timing Capacitor
—
0.1
µF
Timing Resistor
—
8.2
MΩ
Battery Load (Resistor or LED)
—
10
mA
Table 3. Electrical Characteristics
(Voltages referenced to VSS, TA = 25°C)
Symbol
VDD
VDC
Min
Typ(1)
Max
Unit
Operating Voltage
VDD
—
6.0
—
12
V
Output Voltage
Piezoelectric Horn Drivers (IOH = -16 mA)
Comparators (IOH = -30 µA)
Piezoelectric Horn Drivers (IOL = +16 mA)
Comparators (IOL = +30 µA)
VOH
7.2
9.0
7.2
9.0
6.3
8.5
—
—
—
8.8
—
0.1
—
—
0.9
0.5
Output Voltage - LED Driver, IOL = 10 mA
VOL
7.2
—
—
3.0
Output Impedance, Active Guard
Pin 14
Pin 16
Lo-Z
Hi-Z
9.0
9.0
—
—
—
—
10
1000
Operating Current (Rbias = 8.2 MΩ)
IDD
9.0
12.0
—
—
5.0
—
9.0
12.0
µA
Input Current - Detect (40% R.H.)
Iin
9.0
—
—
±1.0
pA
Vlow
Vset
9.0
—
7.2
47
—
50
7.8
53
V
%VDD
Hysteresis
vhys
9.0
75
100
150
mV
Offset Voltage (measured at Vin = VDD/2
Active Guard
Detect Comparator
VOS
9.0
9.0
—
—
—
—
±100
±50
Input Voltage Range, Pin 8
Vin
—
VSS - 10
—
VDD + 10
V
Input Capacitance
Cin
—
—
5.0
—
pF
Common Mode Voltage Range, Pin 15
Vcm
—
0.6
—
VDD - 2
V
Characteristic
Internal Set Voltage
Low Battery
Sensitivity
VOL
V
V
V
kΩ
mV
1. Data labelled “Typ'' is not to be used for design purposes but is intended as an indication of the IC's potential performance.
MC14467-1
Sensors
Freescale Semiconductor
3
Table 4. Timing Parameters
(C = 0.1 µF, Rbias = 8.2 MΩ, VDD = 9.0 V, TA = 25°C, See Figure 7)
Symbol
Min
Typ(1)
Max
Units
tCI
1.34
32
1.67
40
2.0
48
s
ms
tr
8.0
10
12
ms
On Time
Off Time
PWon
PWoff
120
60
160
80
208
104
ms
ms
LED Output
Between Pulses
On Time
tLED
PWon
32
8.0
40
10
48
12
s
ms
Horn Output
(During Low Battery)
On Time
Between Pulses
ton
toff
8.0
32
10
40
12
48
ms
s
Characteristics
Oscillator Period
No Smoke
Smoke
Oscillator Rise Time
Horn Output
(During Smoke)
1. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.
100.0
10.0
TA = 25°C
VDD = 9.0 VDC
TA = 25°C
ID , Drain Current (mA)
ID , Drain Current (mA)
10.0
VDD = 7.2 VDC
1.0
0.1
0
1
2
3
4
5
6
7
8
9
1.0
VDD = 9.0 VDC or 7.2 VDC
0.1
P-CH Source
And N-CH
Sink Current
0.01
10
0
VDS, Drain To Source Voltage (VDC)
1
2
3
4
5
6
7
1000.0
TA = 25°C
VDD = 9.0 VDC
VDD = 9.0 VDC
100.0
ID, Drain Current (mA)
ID, Drain Current (mA)
10
1000.0
TA = 25°C
VDD = 7.2 VDC
10.0
VDD = 7.2 VDC
10.0
P-CH Source Current
1.0
0
9
Figure 4. Typical Comparator Output I-V Characteristic
Figure 3. Typical LED Output I-V Characteristic
100.0
8
VDS, Drain To Source Voltage (VDC)
1
2
3
4
5
6
7
VDS, Drain To Source Voltage (VDC)
N-CH Sink Current
8
9
10
1.0
0
1
2
3
4
5
6
7
8
9
10
VDS, Drain To Source Voltage (VDC)
Figure 5. Typical P Horn Driver Output I-V Characteristic
MC14467-1
4
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Freescale Semiconductor
DEVICE OPERATION
Timing
The internal oscillator of the MC14467-1 operates with a
period of 1.67 seconds during no-smoke conditions. Each
1.67 seconds, internal power is applied to the entire IC and a
check is made for smoke, except during LED pulse, Low
Battery Alarm Chirp, or Horn Modulation (in smoke). Every 24
clock cycles a check is made for low battery by comparing
VDD to an internal zener voltage. Since very small currents
are used in the oscillator, the oscillator capacitor should be of
a low leakage type.
Detect Circuitry
If smoke is detected, the oscillator period becomes 40 ms
and the piezoelectric horn oscillator circuit is enabled. The
horn output is modulated 160 ms on, 80 ms off. During the off
time, smoke is again checked and will inhibit further horn
output if no smoke is sensed. During smoke conditions the
low battery alarm is inhibited, but the LED pulses at a 1.0 Hz
rate.
An active guard is provided on both pins adjacent to the
detect input. The voltage at these pins will be within 100 mV
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. The active
guard op amp is not power strobed and thus gives constant
protection from surface leakage currents. Pin 15 (the Detect
input) has internal diode protection against static damage.
Sensitivity/Low Battery Thresholds
Both the sensitivity threshold and the low battery voltage
levels are set internally by a common voltage divider (please
see Figure 2) connected between VDD and VSS. These
voltages can be altered by external resistors connected from
pins 3 or 13 to either VDD or VSS. There will be a slight
interaction here due to the common voltage divider network.
The sensitivity threshold can also be set by adjusting the
smoke chamber ionization source.
Test Mode
Since the internal op amps and comparators are power
strobed, adjustments for sensitivity or low battery level could
be difficult and/or time-consuming. By forcing Pin 12 to VSS,
the power strobing is bypassed and the outputs, Pins 1 and
4, constantly show smoke/no smoke and good battery/low
battery, respectively. Pin 1 = VDD for smoke and Pin 4 = VDD
for low battery. In this mode and during the 10 ms power
strobe, chip current rises to approximately 50 µA.
LED Pulse
The 9-volt battery level is checked every 40 seconds
during the LED pulse. The battery is loaded via a 10 mA
pulse for 10 ms. If the LED is not used, it should be replaced
with an equivalent resistor such that the battery loading
remains at 10 mA.
Hysteresis
When smoke is detected, the resistor/divider network that
sets sensitivity is altered to increase sensitivity. This yields
approximately 100 mV of hysteresis and reduces false
triggering.
1M
1M
Test
1
330 Ω
8.2 MΩ
0.1 µF
+
9.0 V
MC14467-1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
0.1 µF
1.5 MΩ*
0.001* µF
220 kΩ*
*NOTE: Component values may change depending on type of piezoelectric horn used.
Figure 6. Typical Application as Ionization Smoke Detector
MC14467-1
Sensors
Freescale Semiconductor
5
Standby
No Smoke/
No Low Battery
Smoke/no Low Battery
Smoke/Low Battery
10 m s
40 m s
Oscillator
(Pin 12)
No Smoke/low Battery
1.67 s
Detect Out
(Pin 1)
Low Battery Out
(Pin 4)
Hysteresis (Internal)
(Pins 13 & 14)
Sample (Internal)
Smoke
Horn
(Pins 10 & 11)
(Note 1)
Battery Test
LED
(Pin 5)
Suppressed Chirp
(Note 3)
24 Clock Cycles
24 Clock Cycles (0.96 s)
(Note 3)
24 Clock Cycles
6 Clock
Cycles (10.0 s)
(40 s)
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 (1.67 s for no smoke, 40 ms for smoke).
3. Low battery comparator information is latched only during LED pulse.
4. ~ 100 mVp–p swing.
Figure 7. Timing Diagram
MC14467-1
6
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Freescale Semiconductor
PACKAGE DIMENSIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
-A16
9
1
8
B
F
C
L
S
SEATING
PLANE
-TK
H
G
D
M
J
16 PL
0.25 (0.010)
M
T A
STYLE 1:
PIN 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
M
CATHODE
CATHODE
CATHODE
CATHODE
CATHODE
CATHODE
CATHODE
CATHODE
ANODE
ANODE
ANODE
ANODE
ANODE
ANODE
ANODE
ANODE
STYLE 2:
PIN 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
DIM
A
B
C
D
F
G
H
J
K
L
M
S
INCHES
MILLIMETERS
MIN
MAX MIN MAX
0.740
0.770 18.80 19.55
0.250
0.270
6.35
6.85
0.145
0.175
3.69
4.44
0.015
0.021
0.39
0.53
0.040
0.70
1.02
1.77
0.100 BSC
2.54 BSC
0.050 BSC
1.27 BSC
0.008
0.015
0.21
0.38
0.110
0.130
2.80
3.30
0.295
0.305
7.50
7.74
0
10
0
10
0.020
0.040
0.51
1.01
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
COMMON DRAIN
GATE
SOURCE
GATE
SOURCE
GATE
SOURCE
GATE
SOURCE
CASE 648-08
ISSUE R
16-LEAD PLASTIC DIP
MC14467-1
Sensors
Freescale Semiconductor
7
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MC14467-1
Rev. 4
05/2005
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