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RE46C141S16F データシート(PDF) 6 Page - Microchip Technology

部品番号 RE46C141S16F
部品情報  A Subsidiary of Microchip Technology Inc.
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

RE46C141S16F データシート(HTML) 6 Page - Microchip Technology

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RE46C141
CMOS Photoelectric Smoke Detector ASIC with Interconnect
R&E International
Product Specification
A Subsidiary of Microchip Technology Inc.
© 2009 Microchip Technology Inc.
DS22177B-page 6
PIN DESCRIPTIONS
PIN#
PIN NAME
DESCRIPTION
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 <10000.
2
C2
The capacitor connected to this pin sets the photo amplifier gain (normal) during
standby. The value of this capacitor will depend on the smoke sensitivity
required. A=1+ (C2/10) where C2 is in pF.
3
DETECT
Positive input to the photo amplifier. This input is normally connected to the
cathode of an external photo diode operated at zero bias.
4
STROBE
Regulated output voltage of VDD-5 which is active during a test for smoke. This
output is the negative side of the photo amplifier circuitry.
5
VDD
Connect to the positive supply voltage
6
IRED
Provides a regulated pulsed output voltage pre-driver for the infrared emitter.
This output usually drives the base of an NPN transistor.
7
IO
This bidirectional pin provides the capability to interconnect many detectors in a
single system. This pin has an internal pull-down device.
8
HB
This pin is connected to the metal electrode of a piezoelectric transducer.
9
HS
HS is a complementary output to HB and connects to the ceramic electrode of
the piezoelectric transducer.
10
FEED
Usually connected to the feedback electrode through a current limiting resistor. If
not used this pin must be connected to VDD or VSS.
11
LED
Open drain NMOS output used to drive a visible LED.
12
COSC
A capacitor connected to this pin with parallel resistor sets the internal clock low
time which is approximately the clock period.
13
ROSC
A resistor between this pin and pin 12 (COSC) sets the internal clock high time.
This also sets the IRED pulse width (100-200uS).
14
VSS
Connect to the negative supply voltage.
15
LBSET
This input is connected to a VDD reference voltage to set the low battery
warning voltage.
16
TEST
This input is used to invoke two test modes. This input has an internal pull-down.


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