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bq500211.pdf

bq500211.pdf

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简介:本文档为《bq500211pdf》,可适用于硬件技术领域,主题内容包含bqSchematicandMaterialsApplicationPackageReferenceDesignLiteratureNumber:S符等。

bq500211 Schematic and Materials Application Package Reference Design Literature Number: SLUU987 June 2012 Reference Design SLUU987–June 2012 bq500211 Schematic and Materials Application Package 1 Introduction This reference design provides wireless power developers with the schematics and list of materials required to prototype their first practical wireless power transmitter system using the bq500211. The two WPC compatible examples provided offer: • Best cost savings, reduced to the essentials. • A full-feature approach intended for lowest standby power. Link to the datasheet: bq500211 For more information on Texas Instruments Wireless Power product portfolio, including links to FAQ, please visit: www.ti.com/wirelesspower 2 Description The bq500211 wireless power transmitter from Texas Instruments is a high performance, easy-to-use controller for the design of wireless power solutions. The single-channel transmitter enables designers to speed the development of their end-applications. 3 Features • Intelligent Control of Wireless Power Transfer • 5-V Operation Conforms to Wireless Power Consortium (WPC) Type A5 and Type A11 Transmitter Specifications • Dynamic Power Limiting for USB and Limited Source Operation • Digital Demodulation Reduces Components • Comprehensive Charge Status Mode and Fault Indication 4 Applications • WPC 1.0.3 Compliant Wireless Chargers – Mobile and Smart Phones – Handheld Devices – Hermetically Sealed Devices and Tools – Cars and Other Vehicles – Tabletop Charge Surfaces 2 bq500211 Schematic and Materials Application Package SLUU987–June 2012 Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated G N D -T IE Q 1 R 3 R 3 4 R 6 R 5 C 9 C 2 9 C 1 4 C 2 7 Q 2 U 6 R 1 4 C 1 8 D 3 IN C 2 C 6 C 7 Q 3 R 1 R 2 C 1 3 C 1 5 Q 4 U 2 C 1 6 C 1 9 U 1 R 1 1 R 1 0 C 1 C 4 C 4 3 C 3 C 5 R 2 3 C 2 0 R 2 5 R 1 3 R 3 1 R 3 5 R 3 6 R 1 9 R 2 9 R 9 R 3 2 R 3 3 R 8 C 1 0 C 1 1 D P L R 1 2 R 2 7 R 2 8 D 5 U 3 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 3 1 3 5 2 7 4 1 4 3 36 47 3 8 2 8 1 2 3 7 2 5 1 3 5 1 8 4 4 1 5 23 33 2 9 3 0 1 6 1 7 3 9 4 2 1 4 2 6 2 0 4 0 2 4 2 3 2 1 2 2 1 9 1 0 1 1 34 32 4 8 84 4 5 961 4 6 7 49 U G A T E B O O T P W M G N D L G A T E V D D E N /P G P H U G A T E B O O T P W M G N D L G A T E V D D E N /P G P H R E S E R V E D B P C A P R E S E R V E D R E S E R V E D R E S E R V E D GND GND C O M M _ A - R E S E R V E D D P W M _ A C O M M _ A + M S P _ M O S I/ L P W R _ E N D P W M _ B R E S E T M S P _ C L K L E D _ M O D E D O U T _ 2 B T _ S E N S E A D _ 3 V33D R E S E R V E D R E S E R V E D D O U T _ 4 A D O U T _ 4 B C O M M _ B + I_ S E N S E M S P _ S Y N C M S P _ T D O /P R O G P M B _ C T R L C O M M _ B - B U Z _ D C B U Z _ A C D O U T _ T X D O U T _ R X P M B _ A L E R T P M B _ C L K P M B _ D A T A V33A GND R E F _ IN M S P _ M IS O /L E D _ B L O P W R A D _ 7 M S P _ T E S T S L E E P A D _ 5 V _ S E N S E M S P _ R S T /L E D _ A EPAD IN G N D E N N /C O U T 1 0 R 0 R 1 0 0 K 1 0 K 0 .1 u F 5 0 V 0 .1 u F 5 0 V 3 3 p F 5 0 V 2 2 u F 2 5 V T P S 2 8 2 2 5 D 2 3 K 2 4 .7 n F 5 0 V B A T 5 4 S W 4 .7 u F 1 0 V 4 .7 u F 1 0 V 4 .7 u F 1 0 V 1 0 R 0 R 0 .1 u F 5 0 V 0 .1 u F 5 0 V T P S 2 8 2 2 5 D 1 0 0 n F 1 0 0 n F 1 0 K 7 6 k 8 1 .0 u F 1 6 V 4 .7 n F 5 0 V 4 .7 u F 1 0 V 1 .0 u F 1 6 V 4 .7 u F 1 0 V 4 2 K 2 1 .0 u F 1 6 V 1 0 K 1 0 R 1 0 K 0 1 0 R 1 0 K 0 1 0 R 1 0 R 1 0 R 1 0 K 0 1 0 K 0 1 0 K 0 1 0 0 n F 1 0 0 n F 1 0 K 0 4 7 0 R 4 7 0 R T L V 7 0 0 3 3 5 V in D C J a c k o r U S B C O IL F u l l 5 0 0 m A R G A G N D G N D D P W M -1 A A G N D G N D G N D A G N D G N D G N D 3 V 3 _ V C C A G N D A G N D A G N D 3 V 3 _ V C C 3 V 3 _ A D C A G N D V IN G N D G N D G N D V IN V IN D P W M -1 B A G N D A G N D 3 V 3 _ V C C 3 V 3 _ A D C A G N D C O M M + 3 V 3 _ V C C A G N D A G N D A G N D D P W M -1 A A G N D D P W M -1 B C O M M - C O M M + C O M M - 3 V 3 _ V C C V IN 3 V 3 _ V C C A G N D A G N D V IN 3 V 3 _ V C C www.ti.com Lowest Cost Schematic 5 Lowest Cost Schematic Figure 1. bq500211 Lowest Cost Schematic 3SLUU987–June 2012 bq500211 Schematic and Materials Application Package Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated G N D -T IE Q 1 R 3 R 3 4 R 6 R 5 C 9 C 2 9 C 1 4 C 2 7 Q 2 R 7 U 6 R 1 4 C 1 8 D 3 U 5 IN C 2 C 6 C 7 L 1 D 1 R 4 Q 3 R 1 R 2 C 1 3 C 1 5 Q 4 U 2 R 1 7 U 7 C 2 6 C 1 6 Q 5 R 2 1 C 8 R 3 0 C 1 9 U 1 R 1 1 R 1 0 BUZ C 1 C 4 C 4 3 C 3 C 5 R 2 2 R 2 3 C 2 0 R 2 5 C 2 4 R 1 3 R 3 1 R 3 5 R 3 6 C 2 5 C 2 8 NTC R 3 7 R 1 9 R 2 9 R 9 R 2 0 R 3 2 R 3 3 R 8 C 1 0 C 1 1 R 2 7 R 2 8 D 5 U 4 R 1 2 R 1 6 R 1 8 C 1 2 C 1 7 C 2 1 R 1 5 C 2 2 R 2 6 Q 6 Q 7 U 3 C 2 3 D P L R 2 4 R 3 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 3 1 3 5 2 7 4 1 4 3 36 47 3 8 2 8 1 2 3 7 2 5 1 3 5 1 8 4 4 1 5 23 33 2 9 3 0 1 6 1 7 3 9 4 2 1 4 2 6 2 0 4 0 2 4 2 3 2 1 2 2 1 9 1 0 1 1 34 32 4 8 84 4 5 961 4 6 7 49 1 2 3 4 5 6 7 891 0 1 1 1 2 1 3 1 4 U G A T E B O O T P W M G N D L G A T E V D D E N /P G P H M O D E S W V IN G N D E N F B U G A T E B O O T P W M G N D L G A T E V D D E N /P G P H R E S E R V E D B P C A P R E S E R V E D R E S E R V E D R E S E R V E D GND GND C O M M _ A - R E S E R V E D D P W M _ A C O M M _ A + M S P _ M O S I/ L P W R _ E N D P W M _ B R E S E T M S P _ C L K L E D _ M O D E D O U T _ 2 B T _ S E N S E A D _ 3 V33D R E S E R V E D R E S E R V E D D O U T _ 4 A D O U T _ 4 B C O M M _ B + I_ S E N S E M S P _ S Y N C M S P _ T D O /P R O G P M B _ C T R L C O M M _ B - B U Z _ D C B U Z _ A C D O U T _ T X D O U T _ R X P M B _ A L E R T P M B _ C L K P M B _ D A T A V33A GND R E F _ IN M S P _ M IS O /L E D _ B L O P W R A D _ 7 M S P _ T E S T S L E E P A D _ 5 V _ S E N S E M S P _ R S T /L E D _ A EPAD IN G N D E N N /C O U T 1 0 R 0 R 1 0 0 K 1 0 K 0 .1 u F 5 0 V 0 . 1 u F 5 0 V 3 3 p F 5 0 V 2 2 u F 2 5 V 2 0 m T P S 2 8 2 2 5 D 2 3 K 2 4 .7 n F 5 0 V B A T 5 4 S W T P S 6 2 2 3 7 4 .7 u F 1 0 V 4 .7 u F 1 0 V 4 .7 u F 1 0 V B L U E _ L E D4 7 0 R 1 0 R 0 R 0 .1 u F 5 0 V 0 .1 u F 5 0 V T P S 2 8 2 2 5 D 2 0 0 R L M V 9 3 1 0 .0 1 u F 5 0 V 1 0 0 n F B C 8 5 7 C L 2 0 0 R 0 .1 u F 5 0 V 1 0 K 0 1 0 0 n F 1 0 K 7 6 k 8 1 .0 u F 1 6 V 4 .7 n F 5 0 V 4 .7 u F 1 0 V 1 .0 u F 1 6 V 4 .7 u F 1 0 V N o P o p 4 2 K 2 1 .0 u F 1 6 V 1 0 K 4 .7 n F 5 0 V 1 0 R 1 0 K 0 1 0 R 1 0 K 0 2 2 u F 2 5 V 4 .7 u F 1 0 V 1 0 K 0 1 0 R 1 0 R 1 0 R 1 0 K 0 1 0 K 0 1 0 K 0 1 0 K 0 1 0 0 n F 1 0 0 n F 4 7 0 R 4 7 0 R M S P 4 3 0 G 2 0 0 1 1 0 K 0 4 7 K 0 1 0 K 0 0 .0 1 u F 5 0 V 4 .7 u F 1 0 V 1 .0 n F 1 6 V 1 0 .0 k 4 .7 u F 5 2 3 K B S S 1 3 8 B S S 1 3 8 T L V 7 0 0 3 3 0 .1 u F 5 0 V 1 0 K 0 1 0 K 0 5 V in D C J a c k o r U S B A = 5 0 O p ti o n a l T e m p S e n s o r C O IL L o w P o w e r S u p e rv is o r F u ll 5 0 0 m A S e e N o te 1 i n t h e L is t o f M a te ri a ls - + R G V C C P 1 .0 P 1 .1 P 1 .2 P 1 .3 P 1 .4 P 1 .5 P 1 .6 P 1 .7 R S T T E S T X O U T X IN G N D A G N D G N D D P W M -1 A A G N D G N D G N D A G N D G N D G N D 3 V 3 _ V C C A G N D V IN A G N D A G N D 3 V 3 _ V C C 3 V 3 _ A D C A G N D V IN A G N D A G N D A G N D G N D G N D G N D V IN V IN D P W M -1 B V IN A G N D A G N D A G N D 3 V 3 _ V C C A G N D 3 V 3 _ A D C A G N D I_ S E N S E C O M M + 3 V 3 _ V C C A G N D A G N D A G N D A G N D A G N D D P W M -1 A A G N D D P W M -1 B G N D A G N D 3 V 3 _ V C C C O M M - C O M M + C O M M - I_ S E N S E A G N D3 V 3 _ V C C V IN A G N D A G N D A G N D M S P _ T E S T M S P _ C L K M S P _ M O S I M S P _ S Y N C M S P _ R S T 3 V 3 _ V C C M S P _ R S T M S P _ M IS O M S P _ T E S T M S P _ C L K M S P _ R D Y M S P _ M O S I M S P _ S Y N C A G N D V IN A G N D A G N D 3 V 3 _ V C C M S P _ M IS O M S P _ R D Y Lowest Power Schematic www.ti.com 6 Lowest Power Schematic Figure 2. bq500211 Lowest Power Schematic 4 bq500211 Schematic and Materials Application Package SLUU987–June 2012 Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated www.ti.com List of Materials 7 List of Materials Table 1. bq500211 Lowest Cost List of Materials COUNT REF DES DESCRIPTION PART NUMBER MFR 1 U1 bq500211, Wireless Power Controller, QFN48 bq500211 Texas Instruments 2 U2 U6 TPS28225, Half-Bridge MOSFET Driver TPS28225 Texas Instruments 1 U3 TLV70033, LDO TLV70033 Texas Instruments 4 Q1-4 MOSFET, N-channel, 30 V, 13 A, 9.4 mΩ CSD17308Q3 Texas Instruments 1 D3 DIODE, dual Schottky, 30 V, 200 mA BAT54SW STD 1 D5 LED, bicolor, red/green STD STD 1 COIL WPC A5 or a11 coil and ferrite shield assembly, STD STD application specific (see bq500211 datasheet) 1 DPL Switchover to dynamic power limit, application specific STD STD (see bq500211 datasheet) 1 IN Input power connection, application specific STD STD 6 C9 C13 C15 Capacitor, MLCC, 0.1 µF, 50 V, 20%, X7R, 0603C STD STD C29 3 C1 C3 C20 Capacitor, MLCC, 1.0 µF, 16 V, 20%, X7R, 0603 STD STD 1 C27 Capacitor, MLCC, 22 µF, 25 V, 20%, X5R, 1210C STD STD 1 C14 Capacitor, MLCC, 33 pF, 50 V, 5%, C0G, 0603C STD STD 5 C2 C5-7 C43 Capacitor, MLCC, 4.7 µF, 10 V, 20%, X5R, 0603C STD STD 2 C4 C18 Capacitor, MLCC, 4.7 nF, 50 V X7R 0603 STD STD 4 C10 C11 C16 Capacitor, MLCC, 100 nF, 50 V, 5%, C0G, 1210C STD STD C19 (critical part!) C10 C11 Do not load STD STD alternate C16 alternate Capacitor, film, 180 nF, 50 V, 5%, PPS, 2416C STD STD C19 alternate Capacitor, film, 220 nF, 50 V, 5%, PPS, 2416C STD STD 2 R2 R34 Resistor, 0 Ω Jumper, 0603R STD STD 7 R1 R3 R9 R13 Resistor, chip, 0603R STD STD R19 R29 R35 9 R5 R8 R11-12 Resistor, chip, 0603R STD STD R25 R31-33 R36 2 R27 R28 Resistor, chip, 0603R STD STD 1 R6 Resistor, 100 kΩ, 1%, 0603R STD STD 1 R14 Resistor, 23 kΩ, 1%, 0603R STD STD 1 R23 Resistor, 42 kΩ, 1%, 0603R (LED mode default) STD STD 1 R10 Resistor, 76 kΩ, 1%, 0603R STD STD 5SLUU987–June 2012 bq500211 Schematic and Materials Application Package Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated List of Materials www.ti.com Table 2. bq500211 Lowest Power List of Materials (1) COUNT REF DES DESCRIPTION PART NUMBER MFR 1 U1 bq500211, Wireless Power Controller, QFN48 bq500211 Texas Instruments 2 U2 U6 TPS28225, Half Bridge MOSFET Driver TPS28225 Texas Instruments 1 U3 TLV70033, LDO TLV70033 Texas Instruments 1 U4 MSP430G2001, LoCost MCU MSP430G2001 Texas Instruments 1 U5 TPS62237, Sync Step-Down Converter TPS62237 Texas Instruments 1 U7 LMV931, RRIO OpAmp LMV931 Texas Instruments 4 Q1-4 MOSFET, N-channel, 30 V, 13 A, 9.4 mΩ CSD17308Q3 Texas Instruments 1 Q5 Bipolar, PNP, hi gain BC857CL STD 2 Q6-7 MOSFET, N-channel, 50 V, 0.22 A, 3.5 Ω BSS138 STD 1 D1 LED, blue STD STD 1 D3 Diode, dual Schottky, 30 V, 200 mA BAT54SW STD 1 D5 LED, bicolor, red/green STD STD 1 BUZ Buzzer, piezo, 4 kHz STD STD 1 COIL WPC A5 or a11 coil and ferrite shield assembly, STD STD application specific (see bq500211 datasheet) 1 DPL Switchover to dynamic power limit, application specific STD STD (see bq500211 datasheet) 1 IN Input power connection, application specific STD STD 1 L1 Inductor, 1.0 µH, 800 mA (0805L chip) STD STD 1 NTC NTC, optional thermal sense element, application STD STD specific (see bq500211 datasheet) 1 C21 Capacitor, MLCC, 1.0 nF, 16 V, 10%, X7R, 0603C STD STD 2 C12 C26 Capacitor, MLCC, 0.01 µF, 50 V, 10%, X7R, 0603C STD STD 6 C8 C9 C13 Capacitor, MLCC, 0.1 µF, 50 V, 20%, X7R, 0603C STD STD C15 C23 C29 3 C1 C3 C20 Capacitor, MLCC, 1.0 µF, 16 V, 20%, X7R, 0603 STD STD 1 C25 C27 Capacitor, MLCC, 22 µF, 25 V, 20%, X5R, 1210C STD STD 1 C14 Capacitor, MLCC, 33 pF, 50 V, 5%, C0G, 0603C STD STD 8 C2 C5-7 C17 Capacitor, MLCC, 4.7 µF, 10 V, 20%, X5R, 0603C STD STD C22 C28 C43 3 C4 C18 C24 Capacitor, MLCC, 4.7 nF, 50 V X7R 0603 STD STD 4 C10 C11 C16 Capacitor, MLCC, 100 nF, 50 V, 5%, C0G, 1210C STD STD C19 (critical part!) 2 C10 C11 Do not load STD STD alternate 1 C16 alternate Capacitor, film, 180 nF, 50 V, 5%, PPS, 2416C STD STD 1 C19 alternate Capacitor, film, 220 nF, 50 V, 5%, PPS, 2416C STD STD (1) I_Sense Circuitry is optional but provides roadmap to WPC1.1 compatibility: • Do Not Load: C8, C25, C26, R17, R21, Q5, U7 • Change: R7 = 0 Ohm (jumper) • Leave R30! (I_Sense Referenced to GND) 6 bq500211 Schematic and Materials Application Package SLUU987–June 2012 Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated www.ti.com List of Materials Table 2. bq500211 Lowest Power List of Materials (1) (continued) COUNT REF DES DESCRIPTION PART NUMBER MFR 2 R2 R34 Resistor, 0 Ω, jumper, 0603R STD STD 7 R1 R3 R9 R13 Resistor, chip, 0603R, 10 Ω STD STD R19 R29 R35 16 R5 R8 R11-12 Resistor, chip, 0603R, 10 kΩ STD STD R15 R18 R20 R24-25 R30-33 R36-38 3 R4 R27 R28 Resistor, chip, 0603R, 470 Ω STD STD 1 R16 Resistor, chip, 0603R, 47 kΩ STD STD STD STD 1 R7 Resistor, 0.02 Ω, 1/4 W, 1%, 0805R, 200 PPM, STD STD (current sense) 1 R6 Resistor, 100 kΩ, 1%, 0603R STD STD 1 R22 Resistor, 100 kΩ, 1%, 0603R, do not load (Loss_THR STD STD Default) 2 R17 R21 Resistor, 200 Ω, 1%, 0603R STD STD 1 R14 Resistor, 23 kΩ, 1%, 0603R STD STD 1 R23 Resistor, 42 kΩ, 1%, 0603R (LED mode default) STD STD 1 R26 Resistor, 523 kΩ, 1%, 0603R STD STD 1 R10 Resistor, 76 kΩ, 1%, 0603R STD STD 7SLUU987–June 2012 bq500211 Schematic and Materials Application Package Submit Documentation Feedback Copyright 2012, Texas Instruments Incorporated EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. REGULATORY COMPLIANCE INFORMATION As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules. For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. General Statement for EVMs including a radio User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this are strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization. For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant Caution This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC Interference Statement for Class A EVM devices This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measur

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