R&E International
A Subsidiary of Microchip Technology Inc.
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode
Product Specification
General Description
Features
The RE46C140 is low power CMOS photoelectric type
smoke detector IC. With minimal external components
this circuit will provide all the required features for a
photoelectric type smoke detector.
•
•
•
•
•
•
•
•
•
•
•
The design incorporates a gain selectable photo
amplifier for use with an infrared emitter/detector pair.
An internal oscillator strobes power to the smoke
detection circuitry for 100us every 10 seconds to keep
standby current to a minimum. If smoke is sensed the
detection rate is increased to verify an alarm condition.
A high gain mode is available for push button chamber
testing.
Internal Power On Reset
Low Quiescent Current Consumption
Available in 16L PDIP, 16L N SOIC or 16L W SOIC
ESD Protection on all Pins
Interconnect up to 40 Detectors
10 Minute Timer for Sensitivity Control
Temporal Horn Pattern
Internal Low Battery and Chamber Test
Compatible with Allegro A5366
UL Recognized per File S24036
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging.
Pin Configuration
A check for a low battery condition and chamber
integrity is performed every 43 seconds when in
standby. The temporal horn pattern supports the NFPA
72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected such that when one units alarms, all units
will sound.
C1
1
16
TEST
C2
2
15
VSEN
3
14
VSS
STROBE
4
13
ROSC
VDD
5
12
COSC
IRED
6
11
LED
IO
7
10
FEED
HORNB
8
9
DETECT
An internal 10 minute timer can be used for a reduced
sensitivity mode.
The RE46C140 is recognized by Underwriters
Laboratories for use in smoke detectors that comply
with specification UL217 and UL268.
HORNS
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VALUE
UNITS
Supply Voltage
Input Voltage Range Except FEED, IO
FEED Input Voltage Range
IO Input Voltage Range
Input Current except FEED
Operating Temperature
Storage Temperature
Maximum Junction Temperature
VDD
Vin
Vinfd
Vio1
Iin
TA
TSTG
TJ
15
-.3 to Vdd +.3
-10 to +22
-.3 to 17
10
-25 to 75
-55 to 125
150
V
V
V
V
mA
°C
°C
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when
handling this product. Damage can occur when exposed to extremely high static electrical charge.
2009 © Microchip Technology Inc.
DS22179B-page 1
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
DC Electrical Characteristics at TA = -25° to 75°C, VDD=9V, Typical Application (unless otherwise noted)
Parameter
Supply Voltage
Supply Current
Input Voltage High
Input Voltage Low
Input Leakage Low
Input Leakage High
Input Pull Down Current
Output Leakage Current
Low
Output Leakage Current
High
Symbol
Test
Pin
VDD
5
IDD1
5
IDD2
5
IDD3
5
IDD4
5
VIH1
Limits
Typ
Max
Test Conditions
Min
Units
6
10
Operating
Configured as in Figure 2,
COSC=VSS, LED off
Configured as in Figure 2, VDD=12V,
COSC=VSS
Configured as in Figure 2, STROBE
on, IRED off, VDD=12V
Configured as in Figure 2, STROBE
on, IRED on, VDD=12V, Note 1
FEED
6.2
VIH2
7
No Local Alarm, IO as an Input
3.2
V
VIH3
15
VSEN
1.6
V
VIH4
16
TEST
8.5
V
VIL1
10
FEED
VIL2
7
No Local Alarm, IO as an Input
1.5
V
VIL3
15
VSEN
.5
V
VIL4
16
7
V
IIL1
1,2,3
-100
nA
IIL2
12,10
TEST
VDD=12V, COSC=12V, STROBE
active
VDD=12V, Vin=VSS
-100
nA
IIL3
15,16
VDD=12V, Vin=VSS
-1
uA
ILFD
10
FEED=-10V
-50
uA
IIH1
1,2
VDD=12V, Vin=VDD, STROBE active
100
nA
12
V
4
6
uA
5.5
8
uA
2
mA
3
mA
4.5
4.5
V
2.7
V
IIH2
3,12,10
VDD=12V, Vin=VDD
100
nA
IHFD
10
FEED=22V
50
uA
IPD1
16
Vin=VDD
.25
10
uA
IPD2
15
Vin=VDD
.1
.5
uA
IPDIO1
7
Vin=VDD
20
80
uA
IPDIO2
7
Vin=17V, VDD=12
140
uA
IOZL1
11,13
Output Off, Output=VSS
-1
uA
IOZH1
11,13
Output Off, Output=VDD
1
uA
.25
Note 1: Does not include Q3 emitter current.
2009 © Microchip Technology Inc.
DS22179B-page 2
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
DC Electrical Characteristics (continued) at TA= -25° to 75°, VDD=9V, Typical Application (unless
otherwise noted)
Parameter
Output Voltage Low
Symbol
Test
Pin
VOL1
8,9
Iol=16mA, VDD=6.5V
VOL2
13
Iol=5mA, VDD=6.5V
Test Conditions
Min
1
.5
VOL3
11
Iol=10mA, VDD=6.5V
Output Voltage High
VOh1
8,9
Iol=-16mA, VDD=6.5V
5.5
Output Current
IIOH1
7
-4
IIODMP
7
Alarm, Vio=Vdd-2V or Vio=0V
At Conclusion of Local Alarm or
Test, Vio=1V
VLB
5
VSTOF
4
VSTON
4
VIREDOF
6
VIREDON
6
VCM1
1,2,3
Vref
-
TCST
4
TCIRED
6
ΔVSTON
ΔVIREDON
Low Battery Alarm Voltage
Output Voltage
Common Mode Voltage
Smoke Comparator
Reference
Temperature Coefficient
Line Regulation
Internal Reference, Note 1
4,5
VDD=6V to 12V, STROBE Output
Voltage
VDD=6V to 12V, IRED Output
Voltage
Active, VDD=6V to 12V
6,5
Active, VDD=6V to 12V
-16
V
mA
mA
7.2
7.5
Vdd-.1
2.85
V
V
5
VDD 5.25
Units
V
.6
6.9
STROBE off, VDD=12V,
Iout=-1uA
STROBE on, VDD=9V
Iout= 100uA to 500uA
IRED off, VDD=12V, Iout=1uA
IRED on, VDD=9V
Iout=0 to -6mA, Ta=25C
Local smoke, Push to Test or
Chamber Test, Note 1
Limits
Typ
Max
V
V
VDD 5
3.1
VDD 4.75
.1
V
V
3.35
V
.5
VDD-2
V
VDD3.7
VDD3.3
V
.01
%/ºC
.3
%/ºC
-50
dB
-30
dB
Note 1: Not production tested
Typical values are for design information and are not guaranteed.
Limits over the specified temperature range are not production tested and are based on characterization data.
2009 © Microchip Technology Inc.
DS22179B-page 3
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
AC Electrical Characteristics at TA =-25° to 75°, VDD=9V, VSS=0V, Component Values from Figure 2 ;
R9=100KΩ, R12=10MΩ, C5= 1.5nF(unless otherwise noted)
Parameter
Symbol
Test
Pin
TPOSC
12
Oscillator Period
LED and STROBE On Time
Min
Limits
Typ
Max
No Alarm Condition
9.4
10.5
11.5
mS
Test Conditions
Units
TON1
11,4
Operating
9.4
10.5
11.5
mS
TPLED1
11
Standby, No Alarm
39
43
47
S
TPLED2
11
Local Alarm Condition
.45
.5
.55
S
TPLED3
11
Timer Mode, No Local Alarm
9.6
10.75
11.8
S
TPLED4
11
Remote Alarm Only
TPER1
4,6
TPER1A
4,6
TPER1B
4,6
TPER2
4,6
TPER3
4,6
Standby, No Alarm
Standby, After 1 Valid Smoke
Sample
Standby, After 2 Consecutive Valid
Smoke Samples
In Local Alarm – (3 Consecutive
Valid Smoke Samples)
In Remote Alarm
TPER4
4,6
TPER5
4,6
IRED On Time
TON2
6
Pushbutton Test
Chamber Test or Low Battery
Test, no Alarms
Operating
Horn On Time
THON1
8,9
THON2
8,9
THOF1
8,9
THOF2
8,9
THOF3
8,9
TIODMP
7
TIODLY1
7
TIOFILT
7
TIODLY2
7
LED Period
STROBE and IRED Pulse
Period
Horn Off Time
IO Charge Dump Duration
IO Delay
IO Filter
Remote Alarm Delay
Timer Period
TTPER
LED IS NOT ON
S
9.6
10.75
11.8
S
1.8
2
2.2
S
.9
1
1.1
S
.9
1
1.1
S
7.2
8
8.9
S
300
336
370
mS
47.1
S
38.9
94
104
115
uS
Operating, Alarm Condition, Note 1
Low Battery or Failed Chamber
Test , No Alarm
Operating, Alarm Condition, Note 1
450
500
550
mS
9.5
10.5
11.5
mS
450
500
550
mS
Operating, Alarm Condition, Note 1
Low Battery or Failed Chamber
Test, No Alarm
At Conclusion of Local Alarm or
Test Alarm
From Start of Local Alarm to IO
Active
IO pulse width guaranteed to be
filtered. IO as Input, No Local
Alarm
No Local Alarm, From IO Active
Horn Active
No Alarm Condition, Note 2
1.35
1.5
1.65
S
39
43
47
S
1.46
S
.9
0
S
1.05
8
10
600
mS
2.0
S
12
Min
Note 1 – See timing diagram for Horn Temporal Pattern
Note 2 – During the timer mode the LED Period is 10.5 seconds. The LED period will return to a 43 seconds at the conclusion of the timer
mode.
Note 3 - TPOSC and TON2 are 100% production tested. All other timing is guaranteed by functional testing.
Typical values are for design information and are not guaranteed.
Limits over the specified temperature range are not production tested and are based on characterization data.
2009 © Microchip Technology Inc.
DS22179B-page 4
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
2009 © Microchip Technology Inc.
R&E International
A Subsidiary of Microchip Technology Inc.
DS22179B-page 5
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Functional Block Diagram
Figure 1
2009 © Microchip Technology Inc.
DS22179B-page 6
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
PIN DESCRIPTIONS
PIN#
PIN NAME
1
C1
The capacitor connected to this pin sets the photo amplifier gain (high) for the
push-to-test and chamber sensitivity test. The size of this capacitor will depend
on the chamber background reflections. A=1+(C1/10) where C1 is in pF. The
gain should be
