re46c600 - ionization smoke detector companion ic

RE46C600Ionization Smoke Detector Companion IC

Features

• Low Quiescent Current

• Operation from 3V Battery or AC with 3V Battery Backup

• 9V Boost Converter

• Horn Driver

• 4V Regulated Voltage for Microcontroller Operation in AC Condition

• Low Leakage DETECT Input (+/- 1 pA)

• Alarm Interconnect

• Internal Operational Amplifiers:

- Rail-to-rail Input and Output

- 10 kHz Gain Bandwidth Product

- Unity Gain Stable

Applications

• Smoke Detector

Description

The RE46C600 is a low-power CMOS ionization smokedetector companion IC. The RE46C600 provides all ofthe analog, interface, and power regulation functions fora microcontroller-based ionization smoke detector. It isintended for use in both 3V battery and AC battery-backed applications. It features a boost converter anddriver circuit suitable for driving a piezoelectric horn, a4V regulator for microcontroller voltage regulation, anoperational amplifier and an IO for communication withinterconnected units.

Package TypesRE46C600PDIP, SOIC

DETECT

1

2

3

4

5

6

7

8 9

10

11

12

13

14

15

16

GUARD OPOUT

VDD

IOEN

VREGEN

ACDET

VREG

VOLX

VSS

FEED

HS

HB

HRNEN

IO

2018-2021 Microchip Technology Inc. DS20005951D-page 1

RE46C600

Functional Block Diagram

GUARD

DETECT

HRNEN

VSS

LX

VO

HS

HB

VREG

VDD

BOOSTERROR

AMPLIFIER

REFERENCEVOLTAGE

GENERATOR

FEED

IOEN

ACDET

I_ LIMIT

BOOSTGATE

CONTROL

OPOUT

EN

EN

EN

LEVEL SHIFTER

VDDi

INTERCONNECTLEVEL SHIFTER

IO

VREGENLEVEL

SHIFTER

DS20005951D-page 2 2018-2021 Microchip Technology Inc.

RE46C600

1.0 ELECTRICAL CHARACTERISTICS

1.1 Absolute Maximum Ratings†

VDD..............................................................................................................................................................................+5V

VO, LX .......................................................................................................................................................................+15V

IO...............................................................................................................................................................................+18V

Input Voltage Range Except ACDET, FEED ........................................................................VIN1 = -0.3V to VREG + 0.3V

ACDET.....................................................................................................................................VIN2 = -0.3V to VO + 0.3V

FEED Input Voltage Range ...........................................................................................................VINFD = -10V to + 22V

Input Current except FEED............................................................................................................................. IIN = 10 mA

Output Current VREG....................................................................................................................................IREG = 50 mA

Sink Current OPOUT..................................................................................................................................... IOPO= 20 mA

Output Current IHS, IHB ..................................................................................................................... IHS = IHB = 75 mA

Storage Temperature ..................................................................................................................TSTG = -55C to +125C

HBM ESD................................................................................................................................................................1500V

Maximum Junction Temperature ................................................................................................................... TJ = +150C

† Notice:Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. Thisis a stress rating only and functional operation of the device at these or any other conditions above thoseindicated in the operation listings of this specification is not implied. Exposure to maximum rating conditionsfor extended periods may affect device reliability.

DC ELECTRICAL CHARACTERISTICSUnless otherwise indicated, all parameters apply at TA = -10°C to +60°C, VDD = 3V, VSS = 0V, C5 = 10 µF, C4 = 10 µF, ACDET low. (Note 1) (Note 2) (Note 3)

Parameter Sym.TestPin

Min. Typ. Max. Units Conditions

Supply Voltage VDD 10

2 — 3.6 VOperating, battery-only operation

2 — 4.2 VOperating, AC operation, ACDET high, VREGEN high

VO 16 7 — 14 V —

Standby IDD

IDDSTBY1

10— 0.9 1.6 µA

Inputs low, No loads, boost regulator not running, VO = 10V

IDDSTBY2 — 34 50 µAAC operation, ACDET high, VREGEN high, VO = 10V

Standby IVO

IVOSTBY1

16

— — 0.8 µAInputs low, No loads, boost regulator not running, VO = 10V

IVOSTBY2 — 52 68 µAAC operation, ACDET high, VREGEN high, VO = 10V

Note 1: By default, VO is forced externally with the inductor disconnected and the Boost converter is NOT running, with the exception of VVO and VEFF.

2: Typical values are for design information only.3: The limits shown are 100% tested at 25°C only. Test limits are guard-banded, based on temperature characterization to

warrant compliance at temperature extremes.4: In this test, ACDET = High and VREGEN = High.


RE46C600

Quiescent IDD IDDQ 10 — 34 50 µAInputs low, No loads, VO = 10V, VLX = 0.5V, HRNEN high, ACDET low

Quiescent IVO

IVOQ1

16

— 27 33 µAInputs low, No loads, VO = 10V, VLX = 0.5V, HRNEN high, ACDET low

IVOQ2 — 257 314 µAInputs low, No loads, VO = 10V, VLX = 0.5V, IOEN high, ACDET low

Input Leakage Low

IIL11, 12, 13, 6

— — -100 nAIOEN, ACDET, VREGEN, HRNEN, Inputs VIN = VSS

IILOP 7 — — -1 pADETECT input, VIN = VSS, Ta = 27C, 0-40% RH

IILF 3 — -15 -50 µA FEED = -10V, VO = 14V

Input Leakage High

IIH111, 13,

6— — 100 nA

IOEN, VREGEN, HRNEN Inputs VDD = 4.2V, VIN = 4.2V (Note 4)

IIH2 12 — — 100 nAACDET Input, VIN = 14V, VO = 14V

IIHOP 7 — — 1 pADETECT input, VDD = 4.2V, VIN = 4.2V, Ta = 27C, 0-40% RH (Note 4)

IIHF 3 — 20 50 µA FEED = +22V, VO = 14V

Output Off Leakage High

IIHOZ 1 — — 1 µA LX = VO = 14V

Input Voltage LowVIL1

11, 13, 6

— — 1 VIOEN, VREGEN, HRNEN Inputs

VIL2 12, 3 — — 3 VACDET, FEED Inputs, VO = 10V

Input Voltage HighVIH1

11, 13, 6

2.3 — — VIOEN, VREGEN, HRNEN Inputs

VIH2 12, 3 7 — — VACDET, FEED Inputs, VO = 10V

Output Voltage Low VOL 4, 5 — 0.3 0.5 VHS or HB, IOUT = 16 mA, VO = 10V, HRNEN = VSS

Output Voltage High VOH 4, 5 9.5 9.7 — V

HS or HB, IOUT = -16 mA, VO = 10V, HRNEN high

VOHIO 14 3 — — VIO output, IOUT = -4 mA, VO = 10V, IOEN high

VO Output Voltage VVO 16 8.2 9 9.8 V HRNEN high, IOUT = 10 mA

VO Efficiency VEFF — — 85 — % ILOAD = 10 mA, HRNEN high

DC ELECTRICAL CHARACTERISTICS (CONTINUED)Unless otherwise indicated, all parameters apply at TA = -10°C to +60°C, VDD = 3V, VSS = 0V, C5 = 10 µF, C4 = 10 µF, ACDET low. (Note 1) (Note 2) (Note 3)







RE46C600

VREG Voltage VREG 15 3.92 4 4.08 VIOUT < 20 mA, VREGEN high, ACDET high, VO = 10V

VREG Load Regulation VREGLD 15 — 30 50 mV

IOUT = 0 to 20 mA, HRNEN = High, VREGEN high, ACDET high, VO = 10V

VREG Line Regulation VREGLN 15 — — 5 mVVO = 7 to 14V, IOUT = 1 mA, HRNEN high, VREGEN high, ACDET high

IO Output Current

IOIH1 14 25 — 60 µAIOEN = VSS, IO = 1V, VO = 10V

IOIH2 14 — — 150 µAIOEN = VSS, IO = 15V, VO = 10V

IOIOH1 14 -4 -5 — mA IOEN high, IO = 3V, VO = 10V

IOIOH2 14 — -5 -16 mAIOEN high, IO = VSS, VO = 10V

IO1IOL1 14 — 10 — mAIO Dump Current, at falling edge of IOEN, IOEN = VSS, IO = 1V, VO = 10V

IO Dump TIODUMP 14 — 500 — msIO Dump duration, at falling edge of IOEN, VO = 10V

Input Offset Voltage VGOS1 7, 8, 9 -3 — 3 mVVDD = 2V, VCM = 0.3V or VCM = 1.7V

Common-Mode Voltage Range

VCMR 7, 8, 9 0.3 — VDD – 0.3 V —

Common-Mode Rejection Ratio

CMRR 7, 8, 9 — 80 — dB VCM = 0.3V to VDD – 0.3V

DC ELECTRICAL CHARACTERISTICS (CONTINUED)Unless otherwise indicated, all parameters apply at TA = -10°C to +60°C, VDD = 3V, VSS = 0V, C5 = 10 µF, C4 = 10 µF, ACDET low. (Note 1) (Note 2) (Note 3)






TEMPERATURE CHARACTERISTICSElectrical Characteristics: Unless otherwise indicated.

Parameter Sym. Min. Typ. Max. Units Conditions

Temperature Ranges

Operating Temperature Range TA -10 — +60 °C —

Storage Temperature Range TSTG -55 — +125 °C —

Thermal Package Resistances

Thermal Resistance, 16L-PDIP JA — +70 — °C/W —

Thermal Resistance, 16L-SOIC JA — +86.1 — °C/W —


RE46C600

NOTES:


RE46C600

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE

RE46C600Name Description

PDIP, SOIC

1 LXOpen-drain NMOS output used to drive the boost converter inductor. The inductor should be connected from this pin to the positive supply through a low-resistance path.

2 VSS Connect to the negative supply voltage.

3 FEEDUsually connected to the feedback electrode (F) of the piezoelectric horn through a current-limiting resistor. If not used, this pin must be connected to VSS.

4 HS HS is a complementary output to HB and connects to the ceramic electrode (M) of the piezoelectric transducer.

5 HB This pin is connected to the metal electrode (G) of a piezoelectric transducer.

6 HRNEN Logic input to control the operation of the horn driver.

7 DETECT Noninverting input of the op amp.

8 GUARD Inverting input of the op amp.

9 OPOUT Output of the op amp.

10 VDD Connect to the positive supply voltage.

11 IOEN Logic input to drive the IO to VVO.

12 ACDET AC detect pin.

13 VREGEN Logic input to enable the regulator.

14 IOOutput pin for connection to remote units. This pin has an internal pull-down device. High level is VVO.

15 VREG Regulated output voltage. Nominal output is 4V.

16 VO Regulated output voltage. Nominal output is 9V.


RE46C600

NOTES:


RE46C600

3.0 DEVICE DESCRIPTION

3.1 Introduction

The RE46C600 provides the necessary analog andinterface functions to build a microcontroller-basedionization smoke detector. This includes a low-leakageop amp, a voltage regulator for the microcontroller, ahorn driver, a detector interconnect function, a boostregulator for 3-volt operation, and a power-controlsystem that allows operation from 3V battery or AC-derived power with or without battery backup. TheRE46C600 provides a simple means for themicrocontroller to control the operation of the ionsmoke detector and provides the necessary signalingfunctions during an alarm condition.

3.2 Ionization Sensor Detect Circuit

The RE46C600 provides a low-leakage, high-impedance op amp for an ionization smoke sensor. Theunity gain stable op amp provides rail-to-rail inputs andoutput. The op amp output is monitored by themicrocontroller to determine the smoke density.

3.3 Power Control System

The power control system allows the RE46C600 to bepowered from a 3V battery or AC-derived power. ACpower is supplied as a DC voltage derived from an ACpower supply. The DC voltage is diode-connected tothe VO pin of the RE46C600. A 3V battery is connectedto the VDD pin for low-voltage systems. When only a 3Vbattery is available, the internal circuitry is poweredfrom VDD. When AC power is available, the internalcircuitry is powered from VREG, which is a regulated 4V.

The AC detect (ACDET) pin will disable the boostconverter if ACDET is high. For a 3V battery-onlysystem, the ACDET pin should be connected to VSS,which will enable the boost converter. Under thiscondition, the boost converter will turn on as necessaryto achieve the desired output voltage at VO.

3.4 Boost Regulator

The boost regulator only operates in low-voltageapplications. The ACDET pin will disable the boostconverter if ACDET is high. The boost regulator can beenabled with HORNEN, or with IOEN asserted high.The boost regulator is a fixed off-time boost converterwith peak current limiting. In boost operation, the peakcurrent is nominally 0.8A. The boost regulator providesa nominal 9V on the VO pin.

3.5 Voltage Regulator

The voltage regulator provides a nominal 4V output atthe VREG pin and is intended to power a microcontrollerwhen AC-supplied power is available. The voltageregulator is disabled if ACDET is low. The voltageregulator is enabled if both ACDET and VREGEN arehigh. VREGEN has a pull-up current to VDD. In normaloperation, the regulator will source current up to20 mA, but the current sinking capability is typicallyunder 1 µA. The voltage regulator is powered from theVO pin. In low-voltage applications, the regulator isdisabled.

3.6 Interconnect Operation

The interconnect circuitry provides the means for thesmoke detector to be connected to other smokedetectors. The IO pin is an output-only pin thatconnects to other detectors. IOEN connects to themicrocontroller and determines when IO is driven high.When IOEN is asserted high, the IO output acts as acurrent source that is biased from VO. In low-voltageapplications when IOEN is asserted high, the boostregulator will be active. This ensures there is adequateIO drive capability.

An internal sink device on the IO pin helps to dischargethe interconnect line. This charge dump device isactivated automatically when IOEN transitions fromhigh to low.

3.7 Horn Driver

The horn driver drives a standard three-terminalpiezoelectric horn connected to the HB, HS, and FEEDpins. The alarm is sounded when the microcontrollerdrives the HRNEN pin with the required hornmodulation pattern. In low-voltage applications whenHRNEN is asserted high, the boost regulator is active.This ensures there is adequate horn drive capability toachieve the necessary sound pressure levels. The hornwill begin to sound before the boost regulator reachesthe high boost level.


RE46C600

NOTES:


RE46C600

4.0 APPLICATION NOTES

4.1 Boost Regulator

The boost converter in Active mode (nominal VO = 9V)can draw current pulses of greater than 1A and istherefore very sensitive to series resistance. Criticalcomponents of this resistance are the inductor DCresistance, the internal resistance of the battery, andthe resistance in the connections from the inductor tothe battery, from the inductor to the LX pin, from theinductor through the boost capacitor, and from the VSSpin to the battery. In order to function properly under fullload at VDD = 2V, the total of the inductor andinterconnect resistances should not exceed 0.3Ω.

The internal battery resistance should be no more than0.5Ω and a low-ESR capacitor of 10 µF or more shouldbe connected in parallel with the battery to average thecurrent draw over the boost converter switching cycle.

The Schottky diode and inductor should be specifiedwith a maximum operating current of 1.5A or higher.The boost capacitor should have a low ESR.

The horn driver requires a high voltage, so thepiezoelectric horn can achieve the necessary soundpressure levels. The interconnect function provided byIO needs a high voltage to provide proper interconnectoperation with interconnected alarms.

4.2 Operation Truth Table

Table 4-1 summarizes the basic logic inputs required toenable various operating modes for the RE46C600.

TABLE 4-1: RE46C600 TRUTH TABLE

Inputs Outputs

ACDET VREGEN HRNEN IOEN Boost Reg VREG HORN IO

0 0 0 0 Off Off Off Off


0 0 1 0 On Off On Off

0 1 1 0 On Off On Off

0 0 0 1 On Off Off On

0 1 0 1 On Off Off On

0 0 1 1 On Off On On

0 1 1 1 On Off On On


1 1 0 0 Off On Off Off

1 0 1 0 Off Off On Off

1 1 1 0 Off On On Off

1 0 0 1 Off Off Off On

1 1 0 1 Off On Off On

1 0 1 1 Off Off On On

1 1 1 1 Off On On On


RE46C600

4.3 Typical Applications

A few typical applications using the RE46C600 areshown in Figure 4-1, Figure 4-2 and Figure 4-3.

FIGURE 4-1: Typical Application: AC with 3V Battery Backup.

FIGURE 4-2: Typical Application: 3V Battery Operation.

DETECT

1

2

3

4

5

6

7

8 9

10

11

12

13

14

15

16

GUARD OPOUT

VDD

IOEN

ACDET

VREGEN

IO

VREG

VOLX

VSS

FEED

HS

HB 10 µFC5

1 µFC2

100

R3

10 µFC1

3V

VBAT

Line

NeutralDC

VBAT RE46C600

C61 nFR8

150KR9

1.5 Meg

L110 uH

D5

C410 µF

10-12V

PTT

AC POWER

R5

1 Meg

IOEN

HRNEN

D1

D3

R11M

R21M

VREGDIS

R7

560

IO_IN

R6

D4

OPOUT

HRNEN

100K

C310 µF

C710 µF

VDD

LIVE

GND

Microcontroller

R10

R11

R4

ACDET

390K

100K

100K

MN1

MN2

MP1

R6100K

BATDET

MP2

DETECT

1

2

3

4

5

6

7

8 9

10

11

12

13

14

15

16

GUARD OPOUT

VDD

IOEN

ACDET

VREGEN

IO

VREG

VOLX

VSS

FEED

HS

HB

1 µFC2

100

R3

10 µFC1

3V

VBAT

VBAT RE46C600

C61 nFR8

150KR9

1.5 Meg

L110 uH

D5

C410 µF

PTT

IOEN

HRNEN

R11M

R21M

R7

560

IO_IN

R6

D4

OPOUT

HRNEN

100K

C310 µF

VDD

Microcontroller


RE46C600

FIGURE 4-3: Typical Application: AC Only.

DETECT

1

2

3

4

5

6

7

8 9

10

11

12

13

14

15

16

GUARD OPOUT

VDD

IOEN

ACDET

VREGEN

IO

VREG

VOLX

VSS

FEED

HS

HB

10 µFC5

Line

NeutralDC

RE46C600

C61nFR8

150KR9

1.5 Meg

C410 µF

10-12V

PTT

AC POWER

IOEN

HRNEN

R11M

R21M

R7

560

IO_IN

R6

D4

OPOUT

HRNEN

100K

C310 µF

VDD

LIVE

GND

Microcontroller

D1


RE46C600

NOTES:


RE46C600

5.0 PACKAGING INFORMATION

5.1 Package Marking Information

Legend: XX...X Customer-specific informationY Year code (last digit of calendar year)YY Year code (last 2 digits of calendar year)WW Week code (week of January 1 is week ‘01’)NNN Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn)* This package is Pb-free. The Pb-free JEDEC designator ( )

can be found on the outer packaging for this package.

Note: In the event the full Microchip part number cannot be marked on one line, it willbe carried over to the next line, thus limiting the number of availablecharacters for customer-specific information.

3e

3e

16-Lead PDIP Example

16-Lead SOIC Example

RE46C600-V

1802256

RE46C600

V/SL^^

1802256

3e


RE46C600

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RE46C600

Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging


RE46C600



RE46C600

NOTES:


RE46C600

APPENDIX A: REVISION HISTORY

Revision D (September 2021)

• Updated the Functional Block Diagram.

• Updated Section 1.1 “Absolute Maximum Rat-ings†”.

Revision C (December 2020)

• Initial public release of this document.

• Updated Section 1.1 “Absolute Maximum Ratings†”.

Revision B (July 2020)

• Document not publicly released.

• Updated Section 1.1, Absolute Maximum Ratings† and the DC Electrical Characteristics table.

• Minor typographical edits.

Revision A (February 2018)

• Initial Release of this Document.(Document not publicly released.)


RE46C600

NOTES:


RE46C600

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO. X

PackageDevice

Device: RE46C600 Ionization Smoke Detector Companion IC

Package: E = Plastic Dual In-Line - 300 mil Body,16-Lead (PDIP)

S = Plastic Small Outline - Narrow, 3.90 mm Body,16-Lead (SOIC)

Tape and Reel: T = Tape and Reel

Examples:

a) RE46C600E16: Ionization Smoke Detector Companion IC,16LD PDIP package

b) RE46C600S16: Ionization Smoke Detector Companion IC, 16LD SOIC package

c) RE46C600S16T: Ionization Smoke Detector Companion IC, 16LD SOIC package,Tape and Reel

X

Number of Pins

X

Tape andReel


RE46C600

NOTES:


Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specifications contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is secure when used in the intended manner and under normal conditions.

• There are dishonest and possibly illegal methods being used in attempts to breach the code protection features of the Microchip devices. We believe that these methods require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Attempts to breach these code protection features, most likely, cannot be accomplished without violating Microchip's intellectual property rights.

• Microchip is willing to work with any customer who is concerned about the integrity of its code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not mean that we are guaranteeing the product is "unbreakable." Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication is provided for the solepurpose of designing with and using Microchip products. Infor-mation regarding device applications and the like is providedonly for your convenience and may be superseded by updates.It is your responsibility to ensure that your application meetswith your specifications.

THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS".MICROCHIP MAKES NO REPRESENTATIONS OR WAR-RANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,WRITTEN OR ORAL, STATUTORY OR OTHERWISE,RELATED TO THE INFORMATION INCLUDING BUT NOTLIMITED TO ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR APARTICULAR PURPOSE OR WARRANTIES RELATED TOITS CONDITION, QUALITY, OR PERFORMANCE.

IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDI-RECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUEN-TIAL LOSS, DAMAGE, COST OR EXPENSE OF ANY KINDWHATSOEVER RELATED TO THE INFORMATION OR ITSUSE, HOWEVER CAUSED, EVEN IF MICROCHIP HASBEEN ADVISED OF THE POSSIBILITY OR THE DAMAGESARE FORESEEABLE. TO THE FULLEST EXTENTALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ONALL CLAIMS IN ANY WAY RELATED TO THE INFORMATIONOR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IFANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIPFOR THE INFORMATION. Use of Microchip devices in life sup-port and/or safety applications is entirely at the buyer's risk, andthe buyer agrees to defend, indemnify and hold harmlessMicrochip from any and all damages, claims, suits, or expensesresulting from such use. No licenses are conveyed, implicitly orotherwise, under any Microchip intellectual property rightsunless otherwise stated.

2018-2021 Microchip Technology Inc.

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© 2018-2021, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 978-1-5224-8814-9

DS20005951D-page 25

www.microchip.com/quality

www.microchip.com/quality


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re46c600 - ionization smoke detector companion ic

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