RE46C140S16F Microchip Technology, RE46C140S16F Datasheet - Page 10
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RE46C140S16F
Manufacturer Part Number
RE46C140S16F
Description
Photoelectric Smoke Detector IC W/temporal, Timer 16 SOIC .150in TUBE
Manufacturer
Microchip Technology
Type
Smoke Detectorr
Datasheet
1.RE46C140S16F.pdf
(13 pages)
Specifications of RE46C140S16F
Input Type
Logic
Output Type
Logic
Interface
CMOS
Current - Supply
8µA
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Product
Driver ICs - Various
Supply Voltage (max)
12 V
Supply Voltage (min)
6 V
Supply Current
5.5 uA
Maximum Operating Temperature
+ 75 C
Mounting Style
SMD/SMT
Maximum Turn-off Delay Time
550 ms
Maximum Turn-on Delay Time
550 ms
Minimum Operating Temperature
- 25 C
Number Of Drivers
2
Number Of Outputs
3
Output Current
5 mA
Output Voltage
7 V
Input Voltage
17V
Ic Output Type
Voltage
Sensor Case Style
SOIC
No. Of Pins
16
Supply Voltage Range
6V To 12V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
RE46C140S16F
Manufacturer:
Microchip
Quantity:
1 083
RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect
and Timer Mode
Product Specification
Low Battery and Chamber Test – In standby an internal reference is compared to the voltage divided VDD supply.
Low battery status is latched at the conclusion of the LED pulse. The horn will chirp for 10ms every 43 seconds
until the low battery condition no longer exists. In standby a chamber test is also performed every 40 seconds by
switching to the high gain capacitor C1 and sensing the photo chamber background reflections. Two consecutive
chamber tests failures will also cause the horn to chirp for 10mS every 43 seconds. The low battery chirp occurs
next to the LED pulse and the failed chamber test chirp ~20 seconds later. The low battery and chamber tests are
not performed in a local or remote alarm condition.
Timer Mode – If resistors R
device enters a 10 minute timer mode. In this mode the smoke comparator reference is switched from the internal
VDD-3.5V reference to the voltage that appears on VSEN (pin 15). This allows the sensitivity to be modified for
the duration of the 10 minute timer period. The chamber test is performed in the timer mode. If VSEN is left
unconnected or tied to VSS the timer mode of operation is inhibited.
Diagnostic Mode – In addition to the normal function of the TEST input a special diagnostic mode is available for
calibration and test of the smoke detector. Taking the TEST pin below VSS and sourcing ~300uA out of the pin
for 1 clock cycle will enable the diagnostic mode. In the diagnostic mode some of the pin functions are redefined.
Refer to the table below for redefined pin functions in the diagnostic mode. In addition in this mode STROBE is
always enabled and the IRED is pulsed at the clock rate of 10.5mS nominal.
Pin Name
IO
VSEN
FEED
COSC
HORNB
LED
2009 © Microchip Technology Inc.
Pin Number
15
10
12
11
7
8
adj1
Disabled as an output. A high on this pin directs the photo amplifier output to pin C1
(1) or C2 (2), determined by the level on VSEN (15). Amplification occurs during the
IRED active time.
If IO is high then this pin controls the gain capacitor that is used. If VSEN is low then
normal gain is selected and the photo amp output appears on C1 (1). If VSEN is
high then high gain is selected and the photo amp output is on C2 (2).
If VSEN (15) is low then taking this input high will enable hysteresis which is a
nominal 10% gain increase in normal gain mode.
If desired this pin can be driven by an external clock.
This pin becomes the smoke integrator output. A high level indicates that an alarm
condition has been detected.
The LED pin is used as a low battery indicator. For VDD above the low battery
threshold the open drain NMOS is off. If VDD falls below the threshold the NMOS
turns on.
and R
adj2
are in place and a high to low transition occurs on the TEST input the
Description
A Subsidiary of Microchip Technology Inc.
R&E International
DS22179B-page 10