Archived by Freescale Semiconductor, Inc., 2009
Freescale Semiconductor
Technical Data
MC145017
Rev. 6.0, 3/2007
Low-Power CMOS
Ionization Smoke Detector IC
with Temporal Pattern Horn Driver
MC145017
LOW-POWER CMOS IONIZATION
SMOKE DETECTOR IC WITH
TEMPORAL PATTERN
HORN DRIVER
Archive Information
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
Supports NFPA 72, ANSi 53.41, and ISO 8201 Audible Emergency
Evacuation Signals
Pb-Free Packaging Designated by Suffix Code ED and EG
ORDERING INFORMATION
Device
MC145017P
MC145017ED
MCZ145017EG/R2
Case No.
648-08
751G-04
Package
Plastic Dip
SOICW
P SUFFIX
ED SUFFIX
(PB-FREE)
PLASTIC DIP
CASE 648-08
EG SUFFIX
(PB-FREE)
16-LEAD
SOICW
CASE 751G-04
DETECT COMP.
OUT
N/C
LOW V SET
LOW V COMP.
OUT
LED
VDD
TIMING
RESISTOR
FEEDBACK
1
2
3
4
5
6
7
16
15
14
13
12
11
10
9
GUARD Hi-Z
DETECT INPUT
GUARD LO-Z
SENSITIVITY SET
OSC CAPACITOR
SILVER
BRASS
VSS
8
DETECT
COMP. OUT
N/C
LOW V SET
LOW V
COMP. OUT
LED
VDD
TIMING
RESISTOR
FEEDBACK
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GUARD HI-Z
DETECT
INPUT
GUARD LO-Z
SENSITIVITY
SET
OSC
CAPACITOR
SILVER
BRASS
VSS
Figure 1. . Pin Connections
Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as may be required, to
permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
Archive Information
The MC145017, 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.
Archived by Freescale Semiconductor, Inc., 2009
V
DD
V
DD
4
80 K
3
-
+
V
DD
1045 K
13
1125 K
12
+
-
15
+
-
1
Detect Input
14 Lo-Z
Active
Guard
Latch
V
DD
16
HI-Z
7
Oscillator
5
Low Battery Comp.
Latch
Piezoelectric
Horn Driver
8
11
10
V
DD
6
9
LED Driver
Archive Information
Figure 2. Block Diagram
Table 1. Maximum Ratings
(1)
(Voltages referenced to V
SS
)
Rating
DC Supply Voltage
Input Voltage, All Inputs Except Pin 8
DC Current Drain per Input Pin, Except Pin 15 = 1 mA
DC Current Drain per Output Pin
Operating Temperature Range
Storage Temperature Range
Reverse Battery Time
Symbol
V
DD
V
IN
I
I
T
A
T
STG
T
RB
Value
-0.5
to + 15
-0.25
to V
DD
+0.25
10
30
-10
to +60
-55
to +125
5.0
Unit
V
V
mA
mA
°C
°C
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 V
IN
and V
OUT
be constrained to the range V
SS
≤
(V
IN
or V
OUT
)
≤
V
DD
.
Table 2. Recommended Operating Conditions
(Voltages referenced to V
SS
)
Parameter
Supply Voltage
Timing Capacitor
Timing Resistor
Battery Load (Resistor or LED)
Symbol
V
DD
—
—
—
Value
9.0
0.1
8.2
10
Unit
V
μF
MΩ
mA
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Table 3. Electrical Characteristics
(1)
(Voltages referenced to V
SS
, T
A
= 25°C)
Characteristic
Operating Voltage
Output Voltage
Piezoelectric Horn Drivers (I
OH
=
-16
mA)
Comparators (I
OH
=
-30
μA)
Piezoelectric Horn Drivers (I
OL
= +16 mA)
Comparators (I
OL
= +30
μA)
Output Voltage — LED Driver, I
OL
= 10 mA
Output Impedance, Active Guard
Pin 14
Pin 16
Operating Current (R
bias
= 8.2 MΩ)
Input Current — Detect (40% R.H.)
Input Current, Pin 8
Input Current @ 50°C, Pin 15
Internal Set Voltage
Low Battery
Sensitivity
Hysteresis
Offset Voltage (measured at V
IN
= V
DD
/2
Active Guard
Detect Comparator
Input Voltage Range, Pin 8
Input Capacitance
Common Mode Voltage Range, Pin 15
Symbol
V
DD
V
OH
V
OL
V
OL
LO-Z
HI-Z
I
DD
I
IN
I
IN
I
IN
V
LOW
V
SET
V
HYS
V
OS
V
DD
V
DC
—
7.2
9.0
7.2
9.0
7.2
9.0
9.0
9.0
12.0
9.0
9.0
—
9.0
—
9.0
9.0
9.0
—
—
—
Min
6.0
6.3
8.5
—
—
—
—
—
—
—
—
—
—
7.2
47
75
—
—
V
SS
-10
—
0.6
Typ
—
—
8.8
—
0.1
—
—
—
3.2
—
—
—
—
—
50
100
—
—
—
5.0
—
Max
12
—
—
0.9
0.5
3.0
10
1000
7.0
10.0
±1.0
±0.1
±6.0
7.8
53
150
±100
±50
V
DD
+ 10
—
V
DD
- 2
V
pF
V
μA
pA
μA
pA
V
%V
DD
mV
mV
Unit
V
V
V
V
Archive Information
V
IN
C
IN
V
CM
1. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.
Table 4. Timing Parameters
(C = 0.1
μF,
R
bias
= 8.2 MΩ, V
DD
= 9.0 V, T
A
= 25°C, See
Figure 7)
Characteristics
Oscillator Period
Oscillator Rise Time
Horn Output
(During Smoke)
LED Output
Horn Output
(During Low Battery)
On Time
Off Time
Between Pulses
On Time
On Time
Between Pulses
No Smoke
Smoke
Symbol
t
CI
t
R
PW
ON
PW
OFF
t
LED
PW
ON
t
ON
t
OFF
Min
1.46
37.5
10.1
450
450
35.0
10.1
10.1
35.0
Max
1.85
45.8
12.3
550
550
44.5
12.3
12.3
44.5
Units
s
ms
ms
ms
ms
s
ms
ms
s
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kΩ
Archived by Freescale Semiconductor, Inc., 2009
100.0
V
DD
= 9.0 Vdc
T
A
= 25°C
10.0
T
A
= 25°C
I
D
, Drain Current (mA)
1.0
V
DD
= 9.0 Vdc or 7.2 Vdc
I
D
, Drain Current (mA)
10.0
V
DD
= 7.2 Vdc
1.0
0.1
P-CH Source
And N-CH Sink
Current
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0
1
2
4
5
6
7
V
DS
, Drain To Source Voltage (Vdc)
3
8
9
10
0
1
2
3
4
5
6
7
8
V
DS
, Drain To Source Voltage (Vdc)
9
10
Figure 3. Typical LED Output I–V Characteristic
1000.0
T
A
= 25°C
I
D
, Drain Current (mA)
100.0
I
D
, Drain Current (mA)
V
DD
= 9.0 Vdc
Figure 4. Typical Comparator Output I–V Characteristic
1000.0
T
A
= 25°C
V
DD
= 9.0 Vdc
100.0
10.0
V
DD
= 7.2 Vdc
V
DD
= 7.2 Vdc
10.0
N-CH Sink Current
1.0
0
P-CH Source Current
1.0
0
1
2
4
5
6
7
V
DS
, Drain To Source Voltage (Vdc)
3
8
9
10
1
2
4
5
6
7
V
DS
, Drain To Source Voltage (Vdc)
3
8
9
10
Figure 5. Typical P Horn Driver Output I–V Characteristic
DEVICE OPERATION
Timing
The internal oscillator of the MC145017 operates with a
period of 1.65 seconds during no-smoke conditions. Each
1.65 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
V
DD
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
41.67 ms and the piezoelectric horn oscillator circuit is
enabled. The horn output is modulated 500 ms on, 500 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
MC145017
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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
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0.1
0.01
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battery, respectively. Pin 1 = V
DD
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 11.6 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
16
15
14
13
12
11
10
9
0.1
μF
Archive Information
2
3
4
5
330
Ω
6
7
8
0.1
μF
+
9V
8.2 MΩ
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
OSC
Pin 12
Smoke - N
-Y
1
2
3
4
5
6
7
8
9
23
24 1
6
12
18
24
OSC
Pin 12
Smoke - N
-Y
No Smk
No Low Bat
Smoke
Latch Alarm Condition
No Smk
No Smoke, Low Battery
Low Bat - Y
-N
HYST
Pin 13
(
100 mV Level Shift)
LOW BAT - Y
-N
HORN - On
- Off
LED - Off
- On
LOW BATTERY CHIRP
>
>
NFPA MOD
>
>
(Note 1)
HORN - ON
- OFF
LED - OFF
- ON
24 Clocks
24 Clocks
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 once per cycle (1.65 sec for no smoke, 40 msec for smoke).
Figure 7. MC145017 Timing Diagram
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