A5366CLWTR-T

A5366 SENSITRON | Alldatasheet

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Description

The A5366 is a low-current BiCMOS circuit providing all of the required features for a photoelectric type smoke detector. This device can be used with an infrared photoelectric chamber to sense scattered light from smoke particles. A networking capability allows as many as 50 units to be interconnected so that if any unit senses smoke all units will sound an alarm. Special features are incorporated in the design to facilitate calibration and testing of the finished detector. The device is recognized by Underwriters Laboratories for use in smoke alarms that comply with Standard UL217. A variable-gain photoamplifier can be directly interfaced to an infrared emitter-detector pair. The amplifier gain levels are determined by two external capacitors and are 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 approximately 10% to reduce false triggering. High gain is used during pushbutton test and to periodically monitor the chamber sensitivity during standby. The internal oscillator and timing circuitry keep standby power to a minimum by sensing for smoke for only 100 μs every 10 s. A special three-stage–speedup sensing scheme is incorporated to minimize the time to an audible alarm and also to reduce false triggering. Chamber sensitivity is periodically monitored and two consecutive cycles of degraded sensitivity are required for a warning signal (chirp) to occur. The A5366 is supplied in a 16-pin dual in-line plastic package (suffix A), and for surface mount, a 16-pin SOICW (suffix LW). The lead (Pb) free versions (suffix –T) have 100% matte- tin leadframe plating. The devices are rated for continuous operation over the temperature range of –25°C to 75°C. 26110.11-DS, Rev. E Features and Benefits ▪ Low average standby current for long battery life ▪ Interconnect up to 50 detectors ▪ Piezoelectric horn driver ▪ Low battery detection (all internal) ▪ Chamber sensitivity test and alarm ▪ Power-on reset (POR) ▪ Internal timer and control for reduced sensitivity mode ▪ Built-in circuits to reduce false triggering ▪ 6 to 12 V operating range ▪ ESD protection circuitry on all pins ▪ Temporal Horn Pattern, per UL217, NFPA72, and ISO8201 ▪ UL Recognized for UL217 applications, per file #S2113 Photoelectric Smoke Detector with Interconnect and Timer Packages: Not to scale A5366 16-pin DIP (Package A) 16-pin SOICW (Package LW) Typical Application Diagram DETECT STROBE VDD IRED HORN1 HORN2 I/O FEEDBACK LED OSC CAP TIMING RES VSS HUSH TESTA5366 To / from other units 220 Ω Rx2 Rx1 100 μF 1 kΩ 4.7 kΩ 5 kΩ 4700 pF 0.047 μF 560 Ω 200 kΩ 220 kΩ 1.5 MΩ 1000 pF 100 kΩ 10 MΩ 330 Ω 1500 pF Red LED Push-to-Test 9 V 22 μF Connect HUSH to VSS to disable timer mode Value of component can vary, based on the piezoelectric horn used Connect to allow timer mode ("hush") operation Piezo Horn 8.2 kΩ VDD 22 Ω Smoke Chamber B C C C C B A A

Photoelectric Smoke Detector with Interconnect and TimerA5366 2Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A. Selection Guide Part Number Pb-free Package Packing A5366CA – 16-pin DIP through hole 25 pieces / tube A5366CA-T Yes 16-pin DIP through hole 25 pieces / tube A5366CLWTR-T Yes 16-pin SOICW surface mount 1000 pieces / reel Absolute Maximum Ratings* Characteristic Symbol Notes Rating Units Supply Voltage Range V DD Referenced to VSS –0.5 to 15 V Input Voltage Range V IN Referenced to VSS –0.3 to VDD+0.3 V Input Current I IN 10 mA Operating Ambient Temperature Range T A Range C –25 to 75 ºC Maximum Junction Temperature T J(max) 150 ºC Storage Temperature Range T stg –55 to 125 ºC *CAUTION: CMOS devices have input static protection but are susceptible to damage if exposed to extremely high static electrical charges. Terminal List Table Number Name Function

1 C1 Sets photoamplifier gain in supervisory mode

2 C2 Sets photoamplifier gain in standby mode

3 DETECT Photoamplifier input

4 STROBE Strobed supply (V

DD – 5 V) for photoamplifier low-side reference

5 VDD Positive supply voltage

6 IRED Output to smoke chamber IR LED driver

7 I/O Input-output to interconnected detectors

8 HORN1 Output for driving piezoelectric horn

9 HORN2 Complementary output for driving piezoelectric horn

10 FEEDBACK Input for driving piezoelectric horn

11 LED Output to drive visible LED

12 OSC CAP Connection for capacitor to set clock frequency

13 TIMING RES Connection for resistor to set clock frequency

14 VSS Negative supply voltage

15 HUSH Input for photoamplifier timer mode reference; can also

16 TEST Enables push-to-test mode and diagnostic test/calibration

mode; starts timer mode, if enabled TEST HUSH VSS TIMING RES OSC CAP LED FEEDBACK HORN2 DETECT STROBE VDD IRED I/O HORN1 TEST HUSH VSS TIMING RES OSC CAP LED FEEDBACK HORN2 DETECT STROBE VDD IRED I/O HORN1 Package A Package LW Pin-out Diagrams Thermal Characteristics Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance R θJA Package A, on 4-layer PCB based on JEDEC standard 38 ºC/W Package LW, on 4-layer PCB based on JEDEC standard 48 ºC/W *Additional thermal information available on Allegro website.

Photoelectric Smoke Detector with Interconnect and TimerA5366 3Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Band-gap Reference Low Battery Photoamp 9 V Logic Oscillator and Timing Power-On Reset VDD VDD VDD VDD VDD I/O FEEDBACK HORN1 HORN2 LED TIMING RES OSC CAP TESTHUSH VSS IRED STROBE DETECT +Supply –Supply Functional Block Diagram

Photoelectric Smoke Detector with Interconnect and TimerA5366 4Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. DC ELECTRICAL CHARACTERISTICS at TA = –25°C to 75°C1. VSS = 0 V, in typical ap pli ca tion (un less oth er wise noted) Characteristic Symbol Test Conditions Test Pin V DD Min. Typ. 2 Max. Units Supply Voltage Range V DD 5 – 6.0 – 12 V Operating Supply Current I DD Average in standby mode, configured per typical application 51 2 – – 9 μA During STROBE on, IRED off, configured per typical application 5 12 – – 2.0 mA During STROBE on, IRED on, configured per typical application 5 12 – – 3.0 mA Low-Level Input Voltage V IL 7 9 – – 1.5 V 10 9 – – 2.7 V 16 9 – – 7.0 V 15 9 – – 0.5 V High-Level Input Voltage V IH 7 9 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, OSC CAP = VDD 1, 2 12 – – 100 nA VIN = VDD 3, 10, 12 12 – – 100 nA Input Leakage Low I IL VIN = VST, STROBE active, OSC CAP = VDD 1, 2, 3 12 – – –100 nA 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 7 9 20 – 80 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 to 500 μA4 9 VDD – 5.25 – VDD – 4.75 V Line Regulation ΔVST(ΔVDD) Active, VDD = 6 to 12 V 4 – – –60 – dB Strobe Temperature Coefficient αST VDD = 6 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 Continued on the next page…

Photoelectric Smoke Detector with Interconnect and TimerA5366 5Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Line Regulation ΔVIRED(ΔVDD) Active, VDD = 6 to 12 V 6 – –35 – dB IRED Temperature Coefficient αIRED VDD = 6 to 12 V 6 – – 0.40 – %/°C High-Level Output Current I OH VDD = Alarm, I/O active,VO = VDD – 2 V 7 9 –4.0 – – mA 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-Battery 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 Reference Voltage VREF Any alarm condition Internal - VDD – 3.7 – VDD – 3.3 V 1Limits over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only. 2Typical values are at 25°C and are given for circuit design information only. DC ELECTRICAL CHARACTERISTICS (continued) at TA = –25°C to 75°C1, VSS = 0 V, in typical ap pli ca tion (un less oth er wise noted) Characteristic Symbol Test Conditions Test Pin V DD Min. Typ. 2 Max. Units AC ELECTRICAL CHARACTERISTICS at TA = –25°C to 75°C1. VSS = 0 V, in typical ap pli ca tion (un less oth er wise noted) Characteristic Symbol Test Conditions Test Pin V DD Min. Typ. 2 Max. Units Oscillator Period t osc 12 9 9.4 10.5 11.5 ms LED Pulse Period tled1 No local or remote smoke 11 9 39 – 48 s tled3 Local smoke 11 9 0.45 0.50 0.55 s tled4 Remote smoke only 11 9 – No LED Pulses –s tled6 Pushbutton test, induced alarm 11 9 0.45 0.50 0.55 s tled7 Timer mode, no alarm 11 9 9.67 10.75 11.83 s LED Pulse Width t w(led) 11 9 9.5 – 11.5 ms STROBE Pulse Period tst1 No local or remote smoke 4 9 9.6 – 11.9 s tst2 After 1 of 3 valid samples 4 9 1.8 2.0 2.2 s tst3 After 2 of 3 valid samples and during local alarm 4 9 0.8 1.0 1.1 s tst4 Remote smoke only 4 9 7.2 8.0 8.9 s tst5 Chamber test or low battery test, no local alarm 4 9 38.9 – 47.1 s tst6 Pushbutton test, induced alarm 4 9 225 252 278 ms STROBE Pulse Width t w(st) 4 9 9.5 – 11.5 ms Continued on the next page…

Photoelectric Smoke Detector with Interconnect and TimerA5366 6Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. IRED Pulse Period tired1 No local or remote smoke 6 9 9.6 – 11.9 s tired2 After 1 of 3 valid samples 6 9 1.8 2.0 2.2 s tired3 After 2 of 3 valid samples and during local alarm 6 9 0.8 1.0 1.1 s tired4 Remote smoke only 6 9 7.2 8.0 8.9 s tired5 Chamber test, no local alarm 6 9 38.9 – 47.1 s tired6 Pushbutton test, induced alarm 6 9 225 252 278 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 I/O Charge Dump Duration t dump End of local alarm or test 7 9 0.9 1.0 1.1 s Rising Edge on I/O to Alarm t r(io) No local alarm 7 9 – – 128 × tOSC s Horn Warning Pulse Period t horn Low battery or degraded chamber sensitivity 8, 9 9 38.9 – 47.1 s Horn Warning Pulse Width t w(horn) Low battery or degraded chamber sensitivity 8, 9 9 9.5 – 11.5 ms Horn On-Time t on(horn) Local or remote alarm 8, 9 9 450 500 550 ms Horn Off-Time toff1(horn) Local or remote alarm (see Timing Diagrams section) 8, 9 9 450 500 550 ms toff2(horn) Local or remote alarm (see Timing Diagrams section) 8, 9 9 1350 1500 1650 ms 1Limits over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only. 2Typical values are at 25°C and are given for circuit design information only. AC ELECTRICAL CHARACTERISTICS (continued) at TA = –25°C to 75°C1, VSS = 0 V, in typical ap pli ca tion (un less oth er wise noted) Characteristic Symbol Test Conditions Test Pin V DD Min. Typ. 2 Max. Units

Photoelectric Smoke Detector with Interconnect and TimerA5366 7Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Pin and Circuit Description (In Typical Application) C1 Pin A capacitor connected to this pin determines the gain, Ae, of the photoamplifier during the push-to-test mode and during the chamber monitor test. A typical capacitor value for this high- gain (supervisory) mode is 0.047 μF, but it should be selected based on the photochamber 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 and thus C1 should not exceed 0.1 μF. Coupling of other signals to the C1, C2, and DETECT inputs must be minimized. C2 Pin A capacitor connected to this pin determines the gain, Ae, of the photoamplifier during standby. A typical capacitor value for this low-gain mode is 4700 pF, but it should be selected based on a specific photochamber and the desired level of sensitiv- ity to smoke. A e = 1 + (C2 / 10), where C2 is in pF. Ae should not exceed 10,000 and thus C2 should not exceed 0.1 μF. This gain increases by a nominal 10% after a local alarm is detected (three consecutive detections). A resistor must be installed in series with the C2 capacitor. DETECT Pin This is the input to the photoamplifier and is connected to the cathode of the photodiode. The photodiode is operated at zero bias and should have low dark leakage current and low capaci- tance. A shunt resistor must be installed in parallel with the photodiode. STROBE Pin This output provides a strobed, regulated voltage of V DD – 5 V . The minus side of all internal and external photoamplifier cir- cuitry is referenced to this pin. VDD Pin This pin is connected to the positive supply potential and can range from 6 to 12 V with respect to VSS. IRED Pin This output provides a pulsed base current for the external NPN transistor, which drives the IR emitter. Its beta should be greater than 100. To minimize noise impact, the IRED output is not active when the horn and visible LED outputs are active. I/O Pin A connection at this pin allows multiple smoke detectors to be interconnected. If any single unit detects smoke, its I/O pin is driven high, and all connected units will sound their associated horns. As an input, this pin is sampled every 128 clock cycles (nominally 1.34 s) during standby. The LED is suppressed when an alarm is signaled from an interconnected unit, and any local- alarm condition causes this pin to be ignored as an input. An internal NMOS device acts as a charge dump to aid in applica- tions involving a large (distributed) capacitance, and is activated at the end of a local or test alarm. This pin has an on-chip pull- down device and must be left unconnected if not used. In the application, there should be a series current-limiting resistor to other smoke alarms. HORN1, HORN2, and FEEDBACK Pins These three pins are used with a self-resonating piezoelectric transducer and horn-starting external passive components. The output HORN1 is connected to the piezo metal support elec- trode. The complementary output, HORN2, is connected to the ceramic electrode. The FEEDBACK input is connected to the feedback electrode. If the FEEDBACK pin is not used, it must be connected to VSS. LED Pin 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. If an LED is not used, it should be replaced with an equivalent resistor (typically 500 to 1000 Ω) such that the battery load- ing remains about 10 mA. The low-battery test does not occur coincident 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): Condition Pulse Occurrence Standby Every 43 s Local Smoke Every 0.5 s Remote Alarm No pulses Test Mode Every 0.5 s Timer Mode Every 10 s

Worcester, Massachusetts 01615-0036 U.S.A. low = 0.693 × ROSCCAP × COSCCAP . high = 0.693 × RTIMINGRES × COSCCAP . as the reference for the smoke comparator during timer mode. ally invoke two test modes and timer mode. Table 1. Alternate Pin Configuration During Diagnostic the HUSH pin. The amplifier output appears as pulses. amplifier gain by ≈10% (hysteresis). This pin may be driven by an external clock source. and high. The external RC network may remain intact. This pin is reconfigured as the smoke integrator output. battery threshold, the output turns on. SS due to the internal pull down. “hush” timer mode, if the mode is enabled via the HUSH pin. 400 μA from the pin for at least one clock cycle on OSC CAP.

Photoelectric Smoke Detector with Interconnect and TimerA5366 9Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. increased to one pulse every OSC CAP cycle and the STROBE pin is always active. To exit this mode, the TEST pin should be floated, or returned to V SS, for at least one OSC CAP cycle. Alarm Indications Alarm conditions include: local smoke detection, a remote alarm, low battery, or degraded chamber sensitivity. These are indicated by a combination of horn and LED signals, which continue until the alarm condition is resolved. A local alarm always overrides a remote alarm, and a local or remote alarm will inhibit warning signals for low battery or degraded chamber. During a local or a remote alarm condition, the horn output is a continuous modulated tone (temporal horn pattern), nominally: visible LED distinguishes a local alarm from a remote alarm. During a local alarm, the LED blinks every 0.5 s (nominally), but during a remote alarm, the LED is disabled and does not blink. The degraded-chamber test occurs periodically (nominally every 43 s). During this test, the gain of the photoamplifier is switched to the high (supervisory) level, set by C1. The device expects that the photodiode will receive enough reflected background light in the chamber to cause an alarm condition. If a faulty, dirty, or obstructed chamber prevents this for two consecutive tests, the device signals degraded chamber with one short (nominally 10 ms) horn chirp every 43 s, essentially halfway between LED flashes. The condition is resolved when the chamber is either cleared or cleaned. The low-battery test also occurs periodically (also nominally every 43 s, but offset from the degraded-chamber test). Dur- ing this test, the load of the LED is applied to the battery, and a resistive divider off V DD is compared to an internal band-gap reference. If VDD is below the threshold, the device signals low battery with one short (nominally 10 ms) horn chirp every 43 s, occurring almost simultaneously with the visible LED flash. The condition is resolved when the battery is replaced.

Photoelectric Smoke Detector with Interconnect and TimerA5366 10Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Timing Diagrams (Not to Scale) Standby Mode Low Battery Condition Degraded Chamber Condition OSC CAP Pin STROBE Pin IRED Pin LED Pin LED Pin LED Pin Internal Clock Test event Horn Enable VDD Pin Chamber Sensitivity Photo Sample Chamber Test Low-Battery Test Low-Battery Test Chamber Test Horn Enable tosc tw(st) tw(led) tw(horn) tw(horn) thorn thorn Chirps occur at the end of a failed “test period,” and are nearly coincident with LED flashes Chirps occur after 2 consecutive failed tests, and are offset from LED flashes and from chirps that indicate failure of low-battery tests tst1, tired1 tst5, tired5 tled1, tst5 LED off (High-Z) LED on LED off (High-Z)LED on LED off (High-Z)LED on (Low battery) Failed “test period” (Degraded chamber) 10% 50% 90% tw(ired) tf(ired) tr(ired)

Photoelectric Smoke Detector with Interconnect and TimerA5366 11Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Horn Enable ton(horn) toff1(horn) toff2(horn) I/O Pin LED Pin ttst2, ired2 tw(led) 3rd strobe without smoke STROBE Pin IRED Pin tw(st) tdump O Charge Dump/I tdump O Charge Dump/I (Output) (Input) Horn Enable I/O Pin ton(horn) toff1(horn) toff2(horn) tr(io) tw(st) STROBE Pin LED Pin LED Pin Horn Enable I/O Pin STROBE Pin TEST Pin ton(horn) toff1(horn) toff2(horn) (Output) tw(st) tw(led) tled6 tled3 tst3, ired3t tst3, ired3t tst4, ired4t tst6, ired6t 1st strobe with smoke 3rd strobe with smoke LED off (High-Z) LED off (High-Z) LED on LED off (High-Z) LED on Local Smoke Detection Alarm Condition Remote Alarm Condition Test Alarm Mode

Photoelectric Smoke Detector with Interconnect and TimerA5366 12Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. Package A, 16-Pin DIP .750 [19.05] .210 [5.33] MAX .300 [7.62] .010 [0.25] .018 [0.46] .100 [2.54] .130 [3.30] .060 [1.52] .005 [1.27] A Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area All dimensions nominal, not for tooling use (reference JEDEC MS-001 BB) Dimensions in inches, metric dimensions (mm) in brackets, for reference only Package LW, 16-Pin SOIC 10.30 10.30 0.27 0.84 0.25

2.65 MAX

0.20 1.27 0.41 7.50 CSEATING PLANEC0.10 16X GAUGE PLANE SEATING PLANE All dimensions nominal, not for tooling use Dimensions in millimeters (reference JEDEC MS-013 AA) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area A

Photoelectric Smoke Detector with Interconnect and TimerA5366 13Allegro MicroSystems, Inc. Worcester, Massachusetts 01615-0036 U.S.A. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems offers an industry-leading range of ionization and photoelectric smoke detector ICs. For a current listing, please visit our website at: www.allegromicro.com Copyright ©2001-2007, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. The in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use.