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5358 ALLEGRO

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PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER The A5358CA is a low-current BiCMOS circuit providing all of the required features for a photoelectric type smoke detector. This device can be used in conjunction with an infrared photoelectric chamber to sense scattered light from smoke particles. Special features are incorporated in the design to facilitate calibration and testing of the finished detector. The device is designed to comply with Underwriters Laboratories Specification UL217 and British Standard BS 5446, Part 1. A variable-gain photo amplifier can be directly interfaced to an infrared emitter/detector pair. The amplifier gain levels are determined by two external capacitors that are then internally selected depending on the operating mode. Low gain is selected during standby and timer modes. During a local alarm this low gain is increased (internally) by ~10% to reduce false triggering. High gain is used during the push- button test and during standby to periodically monitor the chamber sensitivity. The internal oscillator and timing circuitry keeps standby power to a minimum by sensing for smoke every 10 seconds in a 10 µs window. A special three-stage speedup sensing scheme is incorporated to minimize the time to an audible alarm and also to reduce false trigger- ing. Also, two consecutive cycles of degraded chamber sensitivity are required for a warning signal to occur. The A5358CA is supplied in a low-cost 16-pin dual in-line plastic package. It is rated for continuous operation over the temperature range of -25°C to +75°C. OSC. & TIMING HORN DRIVER TEST DETECT HUSH OSC. CAP. HORNHORN – SUPPLYV SS C I / O C STROBE + SUPPLY V DD TIMING RES. FEEDBACK 1 2 LEDIRED LOGIC Data Sheet 26110.10A Dwg. PC-007 ABSOLUTE MAXIMUM RATINGS (Voltages are referenced to V SS) Supply Voltage Range, Input Voltage Range, Operating Temperature Range, Storage Temperature Range, CAUTION: CMOS devices have input static protection but are susceptible to damage if exposed to extremely high static electrical charges. Always order by complete part number: A5358CA .

FEATURES

n Interconnect Up to 50 Detectors n Piezoelectric Horn Driver n All Internal Low-Battery Detection n Power-ON Reset n Internal Timer & Control for Reduced Sensitivity n Built-In Circuits to Reduce False Triggering n 6 V to 12 V Operating Voltage Range n ESD-Protection Circuitry on All Pins 5358

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 FUNCTIONAL BLOCK DIAGRAM 4STROBE – SUPPLY V SS 9 V + SUPPLY I / O TIMING RES. FEEDBACK DETECT OSC. CAP. POWER-ON RESET OSCILLATOR & TIMING LOGIC HORN 1 HORN 2 LED TEST V DD V DD Dwg. FC-006 LOW BATTERY HUSH 6IRED PHOTO AMP V DD BAND-GAP REFERENCE Copyright © 1995, 1996 Allegro MicroSystems, Inc.

Characteristic Symbol Test Conditions Pin V DD Min. Typ. Max. Units Supply Voltage Range V DD 5 – 6.0 – 12 V Operating Supply Current I DD Average Standby 5 12 – – 12 µA Configured per Figure 1 During Strobe ON, IRED OFF, 5 12 – – 2.0 mA Configured per Figure 1 During Strobe ON, IRED ON, 5 12 – – 3.0 mA Configured per Figure 1 Low-Level Input Voltage V IL 79 –– 1 . 5 V 10 9 – – 2.7 V 16 9 – – 7.0 V 15 9 – – 0.5 V High-Level Input Voltage V IH 79 3 . 2 –– V 10 9 6.3 – – V 16 9 8.5 – – V 15 9 1.6 – – V Input Leakage High I IH VIN = VDD , Strobe Active, 1, 2 12 – – 100 nA Pin 12 @ VDD VIN = VDD 3, 10, 12 12 – – 100 nA Input Leakage Low I IL VIN = VST , Strobe Active, 1, 2, 3 12 – – -100 nA Pin 12 @ VDD VIN = VSS 10, 12 12 – – -100 nA 15, 16 12 – – -1.0 µA Input Pull-Down Current I IN VIN = VDD 16, 15 9 0.25 – 10 µA No Local Smoke, VIN = VDD 79 2 0 – 8 0 µA No Local Smoke, VIN = 17 V 7 12 – – 140 µA Low-Level Output Voltage V OL IO = 10 mA 11 6.5 – – 0.6 V IO = 16 mA 8, 9 6.5 – – 1.0 V IO = 5 mA 13 6.5 – 0.5 – V High-Level Output Voltage V OH IO = -16 mA 8, 9 6.5 5.5 – – V Strobe Output Voltage V ST Inactive IO = -1 µA4 1 2 VDD - 0.1 –– V Active, IO = 100 µA to 500 µA4 9 VDD - 5.25 – VDD - 4.75 V Continued... DC ELECTRICAL CHARACTERISTICS at TA = -25°C to +75°C*, VSS = 0 V, in typical application (unless otherwise noted). 5358 PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER Worcester, Massachusetts 01615-0036 (508) 853-5000 Test Limits Characteristic Symbol Test Conditions Pin V DD Min. Typ. Max. Units Line Regulation ΔVST(Δ VDD) Active, VDD = 6 V to 12 V 4 – – -60 – dB Strobe Temperature Coeff. α ST VDD = 6 V to 12 V 4 – – 0.01 – %/ °C IRED Output Voltage V IRED Inactive IO = 1 µA, TA = +25°C 6 12 – – 0.1 V Active IO = -6 mA, TA = +25°C 6 9 2.85 3.1 3.35 V Line Regulation Δ VIRED(ΔVDD) Active, VDD = 6 V to 12 V 6 – -35 – dB IRED Temperature Coefficient αIRED VDD = 6 V to 12 V 6 – – +0.40 – %/ °C High-Level Output Current I OH VDD = Alarm, I/O active, 7 9 -4.0 – – mA VO = VDD - 2 V OFF Leakage Current High I OZ VO = VDD 11, 13 12 – – 1.0 µA OFF Leakage Current Low I OZ VO = VSS 11, 13 12 – – -1.0 µA Low VDD Alarm Threshold V DD(th) 5 - 6.9 7.2 7.5 V Common Mode Voltage V IC Any Alarm Condition 1, 2, 3 - VDD - 4 – VDD - 2 V Smoke Comparator Ref. Volt. V REF Any Alarm Condition Internal - VDD - 3.7 – VDD - 3.3 V DC ELECTRICAL CHARACTERISTICS, continued AC ELECTRICAL CHARACTERISTICS at TA = -25°C to +75°C*, VSS = 0 V, in typical application (unless otherwise noted). Test Limits Characteristic Symbol Test Conditions Pin V DD Min. Typ. Max. Units Oscillator Period t osc 12 9 9.4 10.5 11.5 ms Led Pulse Period t led1 No Local or Remote Smoke 11 9 39 – 48 s tled4 Remote Smoke Only 11 9 None – – – tled6 Local Smoke or Test 11 9 0.60 0.67 0.74 s tled7 Timer Mode, No Alarm 11 9 9.67 10.8 11.8 s Led Pulse Width t w(led) 11 9 9.5 – 11.5 ms Continued... * Limits over the operating temperature range are based on characterization data. Characteristics are production tested at +25°C only. Typical values are at +25°C and are given for circuit design information only.

Characteristic Symbol Test Conditions Pin V DD Min. Typ. Max. Units Strobe Pulse Period t st1 No Local or Remote Smoke 4 9 9.6 – 11.9 s tst2 After 1 of 3 Valid Samples 4 9 2.42 2.70 2.96 s tst3 After 2 of 3 Valid Samples 4 9 1.21 1.34 1.47 s and During Local Alarm tst4 Remote Alarm 4 9 9.67 10.8 11.8 s tst5 Chamber Test or Low Supply 4 9 38.9 – 47.1 s Test, No Local Alarm tst6 Pushbutton Test, No Alarm 4 9 300 336 370 ms Strobe Pulse Width t w(st) 4 9 9.5 – 11.5 ms IRED Pulse Period t ired1 No Local or Remote Smoke 6 9 9.6 – 11.9 s tired2 After 1 of 3 Valid Samples 6 9 2.42 2.70 2.96 s tired3 After 2 of 3 Valid Samples 6 9 1.21 1.34 1.47 s and During Local Alarm tired4 Remote Alarm 6 9 9.67 10.8 11.8 s tired5 Chamber Test, No Local Alarm 6 9 38.9 – 47.1 s tired6 Pushbutton Test, No Alarm 6 9 300 336 370 ms IRED Pulse Width t w(ired) 6 9 94 – 116 µs IRED Rise Time t r(ired) 10% to 90% 6 – – 30 µs IRED Fall Time t f(ired) 90% to 10% 6 – – 200 µs I/O to Active Delay t d(io) Local Alarm 7 9–0– s Rising Edge on I/O to Alarm tr(io) No Local Alarm 7 9 – – 1.34 s Horn Warning Pulse Period t horn Low Supply and Degraded 8, 9 9 38.9 – 47.1 s Chamber Sensitivity Horn Warning Pulse Width t w(horn) Low Supply and Degraded 8, 9 9 9.5 – 11.5 ms Chamber Sensitivity Horn ON Time t on(horn) Local or Remote Alarm 8, 9 9 – 252 – ms Horn OFF Time t off(horn) Local or Remote Alarm 8, 9 9 – 84 – ms AC ELECTRICAL CHARACTERISTICS, continued. * Limits over the operating temperature range are based on characterization data. Characteristics are production tested at +25°C only. Typical values are at +25°C and are given for circuit design information only. 5358 PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER Worcester, Massachusetts 01615-0036 (508) 853-5000 PIN AND CIRCUIT DESCRIPTION (In Typical Application) PIN 1 (C1) A capacitor connected to this pin determines the gain of the photo amplifier during the push-to-test mode and during the chamber monitor test. A typical value for this high-gain mode is 0.047 µF but should be selected based on the photo chamber background reflections reaching the detector and the desired level of sensitivity. A e ≈ 1+(C1/10) where C1 is in pF. Ae should not exceed 10 000. PIN 2 (C2) A capacitor connected to this pin determines the gain of the photo amplifier during standby. A typical value for this low-gain mode is 4700 pF but should be selected based on a specific photo chamber and the desired level of sensitivity to smoke. A e ≈ 1+(C2/10) where C2 is in pF. Ae should not exceed 10 000. This gain increases by a nominal 10% after a local alarm is detected (three con- secutive detections). Coupling of other signals to C (C1 and the DETECT inputs also) must be minimized. A resistor must be installed in series with C2. PIN 3 (DETECT) This is the input to the photo amplifier and is con- nected to the cathode of the photo diode. The photo diode is operated at zero bias and should have low dark- leakage current and low capacitance. PIN 4 (STROBE) This output provides a strobed, regulated voltage of V DD – 5 V. The minus side of all internal and external photo amplifier circuitry is referenced to this pin. PIN 5 (VDD) This pin is connected to the most-positive supply potential and can range from 6 V to 12 V with respect to V SS . PIN 6 (IRED) This output provides a pulsed base current for the external npn transistor, which drives the IR emitter. Its beta should be greater than 100. The I RED output is not active, to minimize noise impact, when the horn and visible LED outputs are active. PIN 7 (I/O) A connection at this pin allows multiple smoke detec- tors to be interconnected. If a local smoke condition occurs, this pin is driven high. As an input, this pin is sampled nominally every 1.35 seconds during standby. Any local-alarm condition causes this pin to be ignored as an input. This pin has an on-chip pull-down resistor and must be left unconnected if not used. In application, there is a series current-limiting resistor to other smoke alarms. PIN 8 (HORN PIN 9 (HORN2) PIN 10 (FEEDBACK) These three pins are used in conjunction with external passive components and a self-resonating piezoelectric transducer. HORN 1 is connected to the piezo metal support electrode; the complementary output, HORN2, is connected to the ceramic electrode and the FEEDBACK input to the feedback electrode. A continuous modulated tone indicates either a local or remote alarm condition. A short (10 ms) chirp indicates a low-battery condition or degraded chamber sensitivity. The low-battery chirp occurs almost simultaneous with the visible LED flash. If the FEEDBACK pin is not used, it must be connected to V DD or VSS . Continued...

PIN AND CIRCUIT DESCRIPTION, continued PIN 11 (LED) This open-drain NMOS output is used to directly drive a visible LED. The load for the low-battery test is applied to this output. The low-battery test does not occur coinci- dent with any other test or alarm signal. The LED also indicates detector status as follows (with component values as in the typical application, all times nominal): Standby - Pulses every 43 seconds. Local Smoke - Pulses every 0.67 second. Remote Alarm - No pulses. Test Mode - Pulses every 0.67 second. Timer Mode - Pulses every 10 seconds. PIN 12 (OSC. CAP.) A capacitor between this pin and V DD , along with a parallel resistor, forms part of a two-terminal oscillator and sets the internal clock low time. With component values as shown, this nominal time is 11 ms and essentially the oscillator period. PIN 13 (TIMING RES.) A resistor between this pin and OSC. CAP. (pin 12) is part of the two-terminal oscillator and sets the internal clock high time, which is also the I RED pulse width. With component values as shown, this nominal time is 105 µs. PIN 14 (VSS) This pin is connected to the most negative supply potential (usually ground). PIN 15 (HUSH) This input pin serves two purposes in normal opera- tion. It serves as an enable for the internal 10-minute (nominal) timer and also as the reference for the smoke comparator during the timer mode. This reference is established by a resistive divider between V DD and STROBE (R X1 and RX2). This allows the detector to have a different sensitivity set point during the timer mode. If the timer mode is not used, this pin can be left open or connected to V SS , which disables this mode. PIN 16 (TEST) This pin has an internal pull-down device and is used to manually invoke two test modes and a Timer Mode. The Push-to-Test Mode is initiated by a high logic level on this pin (usually the depression of a normally open push-button switch to V DD ). After one oscillator cycle, IRED pulses every 336 ms (nominal) and amplifier gain is increased by internal selection of C1. Background reflections in the smoke chamber can be used to simulate a smoke condition. After the third I RED pulse, a successful test (three consecutive simulated smoke conditions) activates the horn drivers and the I/O pin. When the push-button is released, the input returns to V SS due to the internal pull down. After one oscillator cycle, the amplifier gain returns to normal and after three additional I RED pulses (less than one second), the device exits this mode and returns to standby. This high-to-low transition on pin 16 also resets and starts the 10 minute hush timer (timer mode). Pin Name Pin No. Configuration I/O 7 Disabled as an output. A logic high on this pin places the photo amplifier output on pin 1 or pin 2 as determined by pin 15. The amplifier output appears as pulses. HUSH 15 If the I/O pin is high, this pin controls the amplifier gain capaci tor. If pin 15 is low, normal gain is selected and the amplifier output is on pin 1. If pin 15 is high, supervisory gain is selected and the amplifier output is on pin 2. FEEDBACK 10 If pin 7 is high and pin 15 is low (normal gain), taking this pin to a high logic level increases the amplifier gain by ~10% (hyster- esis). OSC. CAP. 12 This pin may be driven by an external clock source. Driving this pin low and high drives the internal clock low and high. The external RC network may remain intact. 5358 PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER Worcester, Massachusetts 01615-0036 (508) 853-5000 TYPICAL APPLICATION 8 9 OSC. & TIMING HORN DRIVER VSS V DD LOGIC Dwg. EC-006 TO/FROM OTHER UNITS 9 V PUSH TO TEST VDD CONNECT FOR TIMER MODE OR "HUSH" OPERATION CONNECT FOR NON-TIMER MODE OPERATION SMOKE CHAMBER RX1RX2 8.2kW 5kW4.7kW 1kW 100mF 22W 100kW 1500pF 10M W 1000pF 220kW 100kW 560W 200kW 220W 330W 22mF+ C 1 C 2 The Diagnostic Test Mode is initiated by pulling this pin below VSS and continuously sourcing 400 µA from the pin for at least one clock cycle on the OSC. CAP. pin. This mode is used to facilitate calibration and test of the IC and the assembled detector. In this mode, certain device pins are reconfigured as described below. In this mode, the I RED pulse rate is increased to one every OSC. CAP. cycle and the STROBE pin is always active. To exit this mode, the test pin is floated for at least one OSC. CAP. cycle. Pin Name Pin No. Configuration HORN 1 8 This pin is reconfigured as the smoke integrator output. Three consecutive smoke detections will cause this pin to go high and three consecutive no- smoke detections cause this pin to go low. LED 11 This pin becomes a low-battery indicator. The open-drain NMOS output is normally OFF. If V DD falls below the low- battery threshold, the output turns ON. PIN AND CIRCUIT DESCRIPTION, continued

(not to scale) Dwg. WC-008 OSC. CAP (PIN 12) INTERNAL CLOCK IRED (PIN 6) STROBE (PIN 4) LED (PIN 11) SAMPLE SMOKE HORN ENABLE NO LOW SUPPLY CHAMBER SENSITIVITY NORMAL LOW SUPPLY OR DEGRADED SENSITIVITY WARNING CHIRPS ARE OFFSET WARNING CHIRP tosc tw(st) tst tw(led) tled thorn tw(horn) tw(ired) tired 5358 PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER Worcester, Massachusetts 01615-0036 (508) 853-5000 LOCAL ALARM TIMING DIAGRAM (not to scale) Dwg. WC-009 IRED (PIN 6) STROBE (PIN 4) LED (PIN 11) I/O (PIN 7) HORN ENABLE TESTREMOTE SMOKE (NO LOCAL SMOKE) LOCAL SMOKE (REMOTE SMOKE = DON'T CARE) (AS OUTPUT)(AS INPUT)(AS OUTPUT) (NO PULSES) NO SMOKE 3RD STROBE WITHOUT SMOKE 3RD STROBE WITH SMOKE 10% 90% w(ired) w(st)t led1 r(io) ired6 w(led) on(horn) off(horn) led6 st6t ired3 st3 ired4 st4 on(horn) off(horn) t t t t t tt t t t t t tt 10% f(ired)t

(controlling dimensions) Dimensions in Millimeters (for reference only) NOTES: 1. Lead thickness is measured at seating plane or below. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor’s option within limits shown. 0.014 0.008 0.300 BSC Dwg. MA-001-16A in 0.430 MAX 1 8 0.280 0.240 0.210 MAX 0.070 0.045 0.015 MIN 0.022 0.014 0.100 BSC 0.005 MIN 0.150 0.115 0.775 0.735 0.355 0.204 7.62 BSC Dwg. MA-001-16A mm 10.92 MAX 1 8 7.11 6.10 5.33 MAX 1.77 1.15 0.39 MIN 0.558 0.356 2.54 BSC 0.13 MIN 3.81 2.93 19.68 18.67 5358 PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER

PHOTOELECTRIC SMOKE DETECTOR with INTERCONNECT and TIMER Worcester, Massachusetts 01615-0036 (508) 853-5000 Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. SAFETY & SECURITY ICs SELECTION GUIDE Part Number Function A3054KU/SU Multiplexed Two-Wire Hall-Effect Sensor A5347CA Ionization-Type Smoke Detector with Interconnect and Timer A5348CA Ionization-Type Smoke Detector with Interconnect, Timer, and Reverse-Battery Protection A5349CA Ionization-Type Smoke Detector with Interconnect and Timer for AC Line Operation A5350CA Ionization-Type Smoke Detector with Interconnect and Reverse-Battery Protection A5358CA Photoelectric-Type Smoke Detector with Interconnect and Timer

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Allegro MicroSystems 5358 overview.

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PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER

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PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER

Source title 5358 Datasheet(PDF) - Allegro MicroSystems

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