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RE46C165 Schematic ( PDF Datasheet ) - Microchip Technology

Teilenummer RE46C165
Beschreibung CMOS Photoelectric Smoke Detector ASIC
Hersteller Microchip Technology
Logo Microchip Technology Logo 




Gesamt 30 Seiten
RE46C165 Datasheet, Funktion
RE46C165/6/7/8
CMOS Photoelectric Smoke Detector ASIC
with Interconnect, Timer Mode and Alarm Memory
Features
• Temporal Horn Pattern or Continuous Tone
• Alarm Memory
• Sensitivity Control Times:
- 9 minutes (RE46C165/6)
- 1.2 minutes (RE46C167/8)
• I/O Filter and Charge Dump
• Interconnect up to 40 Detectors
• Internal Power-on Reset (POR)
• >2000V ESD Protection (HBM) on All Pins
• Low Quiescent Current Consumption (<8 µA)
• Internal Low Battery Detection and Chamber Test
• RoHS Compliant Lead-Free Packaging
Description
The RE46C165/6/7/8 devices are low-power, CMOS
photoelectric type, smoke detector ICs. With minimal
external components, these circuits will provide all the
required features for a photoelectric type smoke
detector.
Each 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 100 µs, 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.
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 so when one unit alarms, all units will sound.
A charge dump feature will quickly discharge the
interconnect line when exiting a local alarm. The
interconnect input is also digitally filtered.
An internal timer allows for single button, push-to-test
to be used for a Reduced Sensitivity mode.
An alarm memory feature allows the user to determine
if the unit has previously entered a local alarm
condition.
Utilizing low-power CMOS technology, the
RE46C165/6/7/8 was designed for use in smoke
detectors that comply with Underwriters Laboratory
Specification UL217 and UL268.
2010-2016 Microchip Technology Inc.
DS20002251B-page 1






RE46C165 Datasheet, Funktion
RE46C165/6/7/8
DC ELECTRICAL CHARACTERISTICS(3) (CONTINUED)
DC Electrical Characteristics: Unless otherwise indicated, all parameters apply at TA = -25° to +75°, VDD = 9V,
Typical Application (unless otherwise noted), VSS = 0V
Parameter Symbol Test Pin Min. Typ. Max. Units
Conditions
Input Pull-Down
Current
Output Off Leakage
Low
Output Off Leakage
High
Output High Voltage
Output Low Voltage
Output Current
IPD1
IPD2
IPDIO1
IPDIO2
IOZL1
IOZH1
VOH1
VOL1
VOL2
VOL3
IIOH1
16
15
7
7
11, 13
11, 13
8, 9
8, 9
13
11
7
0.25
0.1
20
5.5
-4
0.25
0.5
10
0.5
80
140
-1
1
1
0.6
-16
IIODMP
7
5
——
Low Battery Voltage
Output Voltage
VLB
VSTOF
5 6.9 7.2
4 VDD – 0.1 —
7.5
VSTON
4 VDD – 5.25 VDD – 5 VDD – 4.75
VIREDOF
6
— 0.1
VIREDON
6
2.85
3.1
3.35
Common-Mode
Voltage
Smoke Comparator
Reference
Temperature
Coefficient
VCM1
VREF
TCST
TCIRED
1, 2, 3
0.5
— VDD – 2
— VDD – 3.7 VDD – 3.5 VDD – 3.3
4 — 0.01 —
6 — 0.3 —
Line Regulation
VSTON
4, 5
-50
VIREDON 6, 5
-30
Note 1:
2:
3:
Does not include Q3 emitter current.
Not production tested.
Production tested at room temperature with guardbanded limits.
µA
µA
µA
µA
µA
µA
V
V
V
V
mA
mA
V
V
V
V
V
V
V
%/°C
%/°C
dB
dB
VIN = VDD
VIN = VDD
VIN = VDD
VIN = 15V, VDD = 12V
Outputs off, Output = VSS
Outputs off, Output = VDD
IOH = -16 mA, VDD = 6.5V
IOL = 16 mA, VDD = 6.5V
IOL = 5 mA, VDD = 6.5V
IOL = 10 mA, VDD = 6.5V
Alarm, VIO = VDD – 2V
or VIO = 0V
At conclusion of local alarm
or test, VIO = 1V
STROBE off, VDD = 12V,
IOUT = -1 µA
STROBE on, VDD = 9V,
IOUT = 100 µA to 500 µA
IRED off, VDD = 12V,
IOUT = 1 µA
IRED on, VDD = 9V,
IOUT = 0 to -6 mA,
TA = +25°C
Local smoke, push-to-test
or chamber test (Note 2)
Internal reference (Note 2)
STROBE output voltage,
VDD = 6V to 12V
IRED output voltage,
VDD = 6V to 12V
STROBE output (vs. VDD),
VDD = 6V to 12V
IRED output voltage,
VDD = 6V to 12V
DS20002251B-page 6
2010-2016 Microchip Technology Inc.

6 Page









RE46C165 pdf, datenblatt
RE46C165/6/7/8
2.9 Horn Feedback Pin (FEED)
Usually, this pin is connected to the feedback electrode
through a current-limiting resistor. If not used, this pin
must be connected to VDD or VSS.
When the horn is enabled, FEED drives the buffered
output HS pin and the complementary output HB pin.
2.10 LED Driver Pin (LED)
This pin is an open-drain NMOS output used to drive a
visible LED.
2.11 Oscillator Capacitor Input (COSC)
A capacitor connected to this pin, with a parallel
resistor, sets the internal clock low time, which is
approximately the clock period.
2.12 Oscillator Resistor Drive Low
(ROSC)
A resistor between this pin and the COSC pin sets the
internal clock high time. This also sets the IRED pulse
width.
2.13 Hush Timer Sensitivity Pin (VSEN)
In Timer mode, this input pin can be used to set an
external smoke comparator reference.
2.14 TEST Pin
This input is used to invoke two Test modes and the
Timer mode. This input has an internal pull-down.
DS20002251B-page 12
2010-2016 Microchip Technology Inc.

12 Page





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