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RE46C167 Datasheet(PDF) 11 Page - Microchip Technology |
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RE46C167 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 30 page 2010-2016 Microchip Technology Inc. DS20002251B-page 11 RE46C165/6/7/8 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. 2.1 High/Normal Gain Capacitor Pins (C1, C2) The capacitor connected to the C1 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 expressed in pF. The gain should be <10000. The capacitor connected to the C2 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 expressed in pF. 2.2 Photo Diode Input (DETECT) This input is normally connected to the cathode of an external photo diode operated at zero bias. 2.3 Strobed Detection Negative Supply (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 reference circuitry. 2.4 Positive Power Supply (VDD) The VDD pin is the device’s positive power supply input. 2.5 Infrared Emitting Diode Pin (IRED) Provides a regulated pulsed output voltage pre-driver for the infrared emitter. This output usually drives the base of an NPN transistor. 2.6 Interconnect Pin (I/O) This bidirectional pin provides the capability to interconnect many detectors in a single system. This pin has an internal pull-down device. 2.7 Horn Brass, Inverted Output (HB) The HB pin is connected to the metal electrode of a piezoelectric transducer. 2.8 Horn Silver Output Pin (HS) The HS pin is a complementary output to HB and connects to the ceramic electrode of the piezoelectric transducer. TABLE 2-1: PIN FUNCTION TABLE RE46C165/6/7/8 PDIP, SOIC Symbol Function 1 C1 High-Gain Capacitor Pin 2 C2 Normal Gain Capacitor Pin 3 DETECT Photo Diode Input 4 STROBE Strobed Detection Negative Supply 5VDD Positive Power Supply 6 IRED Infrared Emitting Diode Pin 7 IO Interconnect Pin 8 HB Horn Brass, Inverted Output 9 HS Horn Silver Output 10 FEED Horn Feedback Pin 11 LED LED Driver Pin 12 COSC Oscillator Capacitor Input 13 ROSC Oscillator Resistor Drive Low 14 VSS Negative Power Supply 15 VSEN Hush Timer Sensitivity Pin 16 TEST Test Pin |
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