RE46C317/18 Piezoelectric Horn Driver with Boost Converter Features: Description: * * * * * The RE46C317/18 are CMOS piezoelectric horn driver ICs with built-in boost converter. They are intended for use in 3V battery or battery-backed applications. The circuits feature a boost converter and a driver circuit suitable for driving a piezoelectric horn. 3V Operation Low Quiescent Current 10V Boost Converter Low Horn Driver On-Resistance Compatible with RE46C117 The RE46C317/18 are compatible with the RE46C117 device and offer lower standby current. Applications: * * * * The RE46C317 has three valid states of Horn Enable (tri-state, low and high), while the RE46C318 has only two valid states, low and high. Smoke Detectors CO Detectors Personal Security Products Electronic Toys Package Types RE46C317/18 PDIP, SOIC FEED 1 8 HRNEN VDD 2 7 HORNS LX 3 6 HORNB VSS 4 5 VO Typical Application RE46C317/18 R1 C4 1.5M R2 HRNEN VDD HORNS LX HORNB High 200K 1 nF FEED RE46C317 Only Tri-state Low L1 RE46C318 Only 10 H V1 C1 2V to 5V High VO VSS C3 10 F 10 F Low D1 Note 1: Schottky diode D1 must have the maximum peak current rating of at least 1A. For best results, the forward voltage spec should be less than 0.5V at 1A. 2: Inductor L3 must have the maximum peak current rating of at least 1A. For best results, the DC resistance should be less than 0.5. 2012-2013 Microchip Technology Inc. DS20002301B-page 1 RE46C317/18 Functional Block Diagram VO VDD Tri-state Logic Level Shifter (RE46C317 Only) HRNEN Horn Driver HORNB Standard Logic Level Shifter (RE46C318 Only) HORNS R1 FEED LX + - Voltage Reference Gate Control + - R2 R3 VSS DS20002301B-page 2 2012-2013 Microchip Technology Inc. RE46C317/18 1.0 ELECTRICAL CHARACTERISTICS 1.1 Absolute Maximum Ratings VDD.............................................................................................................................................................................5.5V VOUT .........................................................................................................................................................................12.5V Input Voltage Range Except FEED, LX................................................................................VIN = VSS - .3V to VDD + .3V FEED Input Voltage Range ........................................................................................................... VINFD = -10V to + 22V LX Input Voltage ...............................................................................................................................VINLX = VOUT + 0.8V Input Current except FEED, LX ...................................................................................................................... IIN = 10 mA LX Current (Peak) ...........................................................................................................................................IINLX = 1.0A Operating Temperature .....................................................................................................................TA = -10C to +60C Storage Temperature ..................................................................................................................TSTG = -55C to +125C Continuous Operating Current (HORNS, HORNB, VO) .................................................................................. IO = 40 mA Maximum Human Body Model ESD........................................................................................................................1500V Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be used when handling this product. Damage can occur when exposed to extremely high static electrical charge. DC ELECTRICAL CHARACTERISTICS - RE46C317 Unless otherwise indicated, all parameters apply at TA = -10C to +60C, VDD = 3V, VSS = 0V, C3 = 10 F. Typical values are at TA = +25C Symbol Test Pin Supply Voltage VDD 2 Standby Supply Current IDD1 2 Standby IVO IVO1 5 Quiescent Supply Current IDD2 2 Quiescent IVO IVO2 Supply current Parameter Input Current for Tri-state Input Voltage High Note 1: 2: 3: 4: Min. Typ. Max. Units Conditions 2 -- 5 V Operating -- 0.5 1 A HRNEN = Float; No loads -- 0 0.3 A HRNEN = Float; No loads -- 27 49 A HRNEN = Low; No Loads; VO = 11V; VL X = 0.5V 5 -- 71 115 A HRNEN = Low; No Loads; VO = 11V; VL X = 0.5V ISUP 2 -- 300 -- A HRNEN = Low; No Loads, Boost Running IIT 8 -5 -- 5 A HRNEN = Float (Note 4) VIHH 8 2.6 -- -- V HRNEN input VIHF 1 7 -- -- V FEED input; VO = 10V The boost converter in Boost mode (normal VO = 10V) can draw current pulses of ~0.8A and therefore is very sensitive to series resistance. The critical components of this resistance are the inductor DC resistance, the internal resistance of the battery and the resistance in the connections from the inductor to the battery, from the inductor to the LX pin. In order to function properly under full load at VDD = 2V, the total of the inductor and the interconnect resistances should not exceed 0.3. The internal battery resistance should be no more than 0.5. A low ESR capacitance of 10 F or more should be connected in parallel with the battery to average current over the boost converter cycle. In the above table, wherever a specific VO value is listed under test conditions, the VO is forced externally with the inductor disconnected, and the boost converter is not running. The limits shown are 100% tested at +25C only. Test limits are guard-banded, based on temperature characterization to ensure compliance at temperature extremes. This is the maximum input current that will not cause a logic high or logic low to be asserted. 2012-2013 Microchip Technology Inc. DS20002301B-page 3 RE46C317/18 DC ELECTRICAL CHARACTERISTICS - RE46C317 (CONTINUED) Unless otherwise indicated, all parameters apply at TA = -10C to +60C, VDD = 3V, VSS = 0V, C3 = 10 F. Typical values are at TA = +25C Symbol Test Pin Min. Typ. Max. Units VILH 8 -- -- 0.4 V HRNEN input VILF 1 -- -- 3 V FEED input; VO = 10V IIHF 1 -- 20 50 A FEED = 22V; VO = 10V IILF 1 -50 -15 -- A FEED = -10V; VO = 10V IIHH 8 -- 20 50 A HRNEN = VDD IILH 8 -50 -20 -- A HRNEN = VSS Output Leakage IOZH 3 -- -- 1 A HRNEN = Float; VO = 12.5V; VLX = 10V VO Output Voltage VVO 5 9 10 11 V VDD = 3V, HRNEN = Low or High, IOUT = 10 mA VOEFF 5 -- 80 -- % ILOAD = 10 mA, VDD = 3V, HRNEN = 0V Output Low Voltage VOL 6, 7 -- 0.3 0.5 V HORNB or HORNS IOUT = -16 mA, VDD = 3V Output High Voltage VOH 6, 7 9.5 9.7 -- V HORNB or HORNS VO =10V VDD = HRNEN = 3V IOUT = 16 mA Parameter Input Voltage Low Input Leakage VO Efficiency Note 1: 2: 3: 4: Conditions The boost converter in Boost mode (normal VO = 10V) can draw current pulses of ~0.8A and therefore is very sensitive to series resistance. The critical components of this resistance are the inductor DC resistance, the internal resistance of the battery and the resistance in the connections from the inductor to the battery, from the inductor to the LX pin. In order to function properly under full load at VDD = 2V, the total of the inductor and the interconnect resistances should not exceed 0.3. The internal battery resistance should be no more than 0.5. A low ESR capacitance of 10 F or more should be connected in parallel with the battery to average current over the boost converter cycle. In the above table, wherever a specific VO value is listed under test conditions, the VO is forced externally with the inductor disconnected, and the boost converter is not running. The limits shown are 100% tested at +25C only. Test limits are guard-banded, based on temperature characterization to ensure compliance at temperature extremes. This is the maximum input current that will not cause a logic high or logic low to be asserted. DS20002301B-page 4 2012-2013 Microchip Technology Inc. RE46C317/18 DC ELECTRICAL CHARACTERISTICS - RE46C318 Unless otherwise indicated, all parameters apply at TA = -10C to +60C, VDD = 3V, VSS = 0V, C3 = 10 F. Typical values are at TA = +25C. Symbol Test Pin Supply Voltage VDD Standby Supply Current IDD1 Input Voltage High Parameter Input Voltage Low Input Leakage Min. Typ. Max. Units Conditions 2 2 -- 5 V Operating 2 -- -- 0.1 A HRNEN = Low; No loads VIHH 8 2.3 -- -- V HRNEN input VIHF 1 7 -- -- V FEED input; VO = 10V VILH 8 -- -- 1 V HRNEN input VILF 1 -- -- 3 V FEED input; VO = 10V IIHF 1 -- 20 50 A FEED = 22V; VO = 10V IILF 1 -50 -15 -- A FEED = -10V; VO = 10V IIN 8 -100 -- 100 nA HRNEN = VDD or VSS Output Leakage IOZH 3 -- -- 1 A HRNEN = VSS, VO = 12.5V, VLX = 10V VO Output Voltage VVO 5 9 10 11 V VDD = 3V, HRNEN = High, IOUT = 10 mA VVOEFF 5 -- 80 -- % ILOAD = 10 mA, VDD = 3V, HRNEN = 0V Output Low Voltage VOL 6, 7 -- 0.3 0.5 V HORNB or HORNS; IOUT = -16 mA; VDD = 3V Output High Voltage VOH 6, 7 9.5 9.7 -- V HORNB or HORNS; VO = 10V; VDD = HRNEN = 3V; IOUT = 16 mA VO Efficiency AC ELECTRICAL CHARACTERISTICS Unless otherwise indicated, all parameters apply at TA = -10C to +60C, VDD = 3V, VSS = 0V, C3 = 10 F. Typical values are at TA = +25C. Parameter Horn Delay Note 1: Symbol Test Pin Min. Typ. Max. Units THRN 8/6 or 8/7 -- -- 1 ms Conditions HRNEN = High; Boost Running; 16 mA Load Horn Delay is the delay between a high signal on HRNEN and the horn output turning ON. The internal circuitry delays the horn output until the Boost voltage reaches its set point, 10V nominally. TEMPERATURE CHARACTERISTICS Electrical Characteristics: Unless otherwise indicated, VDD = 3V, VSS = 0V Parameter Symbol Min. Typ. Max. Units Conditions Temperature Ranges TA -10 -- 60 C TSTG -55 -- 125 C Thermal Resistance, 8L-PDIP JA -- 89.3 -- C/W Thermal Resistance, 8L-SOIC JA -- 149.5 -- C/W Operating Temperature Range Storage Temperature Range Thermal Package Resistances 2012-2013 Microchip Technology Inc. DS20002301B-page 5 RE46C317/18 NOTES: DS20002301B-page 6 2012-2013 Microchip Technology Inc. RE46C317/18 2.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE RE46C317/18 Symbol Description PDIP, SOIC 2.1 1 FEED 2 VDD Horn Feedback Positive supply voltage 3 LX External inductor 4 VSS Negative supply voltage 5 VO Output of Boost converter 6 HORNB Horn Brass 7 HORNS Horn Silver 8 HRNEN Horn Enable Horn Feedback Pin (FEED) 2.7 Horn Silver Pin (HORNS) This pin is usually connected to the feedback electrode of the piezoelectric horn through a current limiting resistor. If not used, this pin must be connected to VSS. This is the complementary output to HORNB. It connects to the ceramic electrode (S) of the piezoelectric transducer. 2.2 2.8 Positive Supply Pin (VDD) This pin is connected to the positive supply voltage of the system. 2.3 External Inductor Pin (LX) Horn Enable Pin (HRNEN) This is the logic input for horn enable. Tables 2-2 and 2-3 show the different HRNEN states and their description. TABLE 2-2: RE46C317 HORN ENABLE This is the open drain NMOS output used to drive the boost converter inductor. The inductor should be connected from this pin to the positive supply voltage through a low resistance path. Tri-state Standby mode; Boost converter is Disabled, Horn is Disabled 2.4 Low Boost converter is Enabled, Horn is Disabled High Boost converter is Enabled, Horn is Enabled Negative Supply Pin (VSS) This pin is connected to the negative supply voltage of the system. 2.5 Boost Converter Output Pin (VO) State TABLE 2-3: This is the output pin of the boost converter, typically 10V. 2.6 State 2012-2013 Microchip Technology Inc. RE46C318 HORN ENABLE Description Low Standby mode; Boost converter is Disabled, Horn is Disabled High Boost converter is Enabled, Horn is Enabled Horn Brass Pin (HORNB) This pin is connected to the metal electrode (B) of the piezoelectric transducer. Description DS20002301B-page 7 RE46C317/18 NOTES: DS20002301B-page 8 2012-2013 Microchip Technology Inc. RE46C317/18 3.0 DEVICE DESCRIPTION RE46C317 and RE46C318 have three main blocks: * Horn driver * Boost regulator * Horn Enable logic The following sections describe these blocks. 3.1 Horn Driver The horn driver is a push-pull circuit, capable of driving a three-terminal piezoelectric horn. It can also drive a modified two-terminal Piezo horn. 3.2 Horn Enable In RE46C317, the HRNEN is a tri-state signal with three valid states: low, high and tri-state (or midsupply). The three levels of HRNEN determine the modes of operation. When HRNEN is in tri-state, the device is in Standby mode and all circuits are disabled. This is the lowest current operating mode. When HRNEN is low, the device is in Boost-Only mode. In this mode, only the boost regulator is enabled and the output voltage is boosted to 10V nominally. The horn driver circuit is disabled in this mode. This mode can be used to check for a low battery condition. 3.3 Boost Regulator The boost regulator in the RE46C317/18 is a current-mode controller with two control loops, that work together in maintaining a constant output voltage and supply the required load current. The inner current control loop provides cycle-by-cycle current limiting, while the outer control loop provides output voltage control. When the boost converter is turned on using the HRNEN input, the NMOS switch turns on and the inductor current ramps up to its peak value, approximately 0.6A nominally. The current comparator turns off the NMOS switch for a fixed period of time to allow energy to be transferred to the output capacitor. When the voltage on the output capacitor equals or exceeds the desired output voltage, 10V nominally, the current loop is disabled until the load discharges the output capacitor to a voltage lower than the desired output voltage. Every time the output voltage falls below the desired value, the switching cycle starts and continues until the desired value is reached. The constant switching resulting in the charging and discharging of the output capacitor causes a ripple on the output voltage. The ripple on the output voltage depends on the external component parameters, such as the value of external capacitor, its ESR, etc. The RE46C318 uses a binary logic circuit, rather than tri-state logic, to determine the mode of operation. In both RE46C317 and RE46C318, when logic high is asserted on the HRNEN pin, the boost regulator is enabled. However, the horn output is not enabled until the output voltage reaches its nominal set point, 10V nominally. This ensures that the output voltage rises quickly to the necessary drive voltage for the Piezo horn. When HRNEN is low, the boost and horn driver circuits are disabled and the device is in Standby. This is the lowest current operating mode. The boost regulator has been optimized to work with the external components as shown in the Typical Application circuit. When HRNEN is high, the part is in Normal Operation. The boost regulator and the horn driver circuits are enabled in this mode. When HRNEN is high, the boost and horn driver circuits are enabled. 2012-2013 Microchip Technology Inc. DS20002301B-page 9 RE46C317/18 Figure 3-1 shows the horn turn-on delay after the HRNEN has been asserted high. After the boost voltage reaches its nominal set point, the HORNB output turns on. In this case, the HORNB output is driving a load current of 20 mA DC. FIGURE 3-1: Delay. RE46C317 Horn Turn-On Figure 3-2 shows the typical switching waveforms of the boost regulator. The top waveform shows the boost output, the center waveform shows the LX switching waveform, and the lower waveform shows the inductor current. FIGURE 3-2: Waveforms. DS20002301B-page 10 RE46C317/18 Switching 2012-2013 Microchip Technology Inc. RE46C317/18 4.0 PACKAGING INFORMATION 4.1 Package Marking Information 8-Lead PDIP (300 mil) XXXXXXXX XXXXXNNN Example RE46C318 3 V/P e^^256 1315 YYWW 8-Lead SOIC (3.90 mm) NNN Legend: XX...X Y YY WW NNN e3 * Note: Example RE46C317 3 SN e^^1315 256 Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 2012-2013 Microchip Technology Inc. DS20002301B-page 11 RE46C317/18 3 & ' !&" & 4# *!( !!& 4 %& &#& && 255***' '5 4 N NOTE 1 E1 1 3 2 D E A2 A L A1 c e eB b1 b 6&! '! 9'&! 7"') %! 7,8. 7 7 & ; < & & 7: 1, = = - 1!& & = = . - - ##4 "# & 4!! "# >#& ##4>#& . < : 9& -< -? 9 - < ) ? ) < 1 = = & & 9# 6 4!! 9#>#& 9 * 9#>#& : * + - !"#$%&" ' ()"&'"!&) &#*& & & # +%&, & !& - '! !#.# &"#' #%! & "! ! #%! & "! !! &$#/ !# '! #& .0 1,21!'! &$& "! **& "&& ! DS20002301B-page 12 * ,<1 2012-2013 Microchip Technology Inc. RE46C317/18 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2012-2013 Microchip Technology Inc. DS20002301B-page 13 RE46C317/18 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20002301B-page 14 2012-2013 Microchip Technology Inc. RE46C317/18 ! ""#$%& !' 3 & ' !&" & 4# *!( !!& 4 %& &#& && 255***' '5 4 2012-2013 Microchip Technology Inc. DS20002301B-page 15 RE46C317/18 NOTES: DS20002301B-page 16 2012-2013 Microchip Technology Inc. RE46C317/18 APPENDIX A: REVISION HISTORY Revision B (May 2013) The following has been modified: 1. Added Maximum Human Body Model ESD value to Section 1.1, Absolute Maximum Ratings. Revision A (June 2012) * Original Release of this Document. 2012-2013 Microchip Technology Inc. DS20002301B-page 17 RE46C317/18 NOTES: DS20002301B-page 18 2012-2013 Microchip Technology Inc. RE46C317/18 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. Device X X X Package Number Lead Free/ of Pins Tape and Reel Device: RE46C317 RE46C318 Package: E S Examples: a) RE46C317E8F: b) RE46C317S8F: c) RE46C317S8TF: a) RE46C318E8F: b) RE46C318S8F: c) RE46C318S8TF: CMOS Piezo Horn Driver IC CMOS Piezo Horn Driver IC = Plastic Dual In-Line (300 mil Body), 8-Lead (PDIP) = Small Plastic Outline - Narrow, 3.90 mm Body, 8-Lead (SOIC) 2012-2013 Microchip Technology Inc. 8LD PDIP package, Lead Free 8LD SOIC package, Lead Free 8LD SOIC package, Tape and Reel 8LD PDIP package, Lead Free 8LD SOIC package, Lead Free 8LD SOIC package, Tape and Reel DS20002301B-page 19 RE46C317/18 NOTES: DS20002301B-page 20 2012-2013 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: * Microchip products meet the specification contained in their particular Microchip Data Sheet. * Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. * There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. * Microchip is willing to work with the customer who is concerned about the integrity of their code. * Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "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 regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, dsPIC, FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor, MTP, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. Analog-for-the-Digital Age, Application Maestro, BodyCom, chipKIT, chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O, Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA and Z-Scale are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. GestIC and ULPP are registered trademarks of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. (c) 2012-2013, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. 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