BeagleBone Battery Cape Rev A System Reference
Contents
1. 10 Table 2 BeasleBone Battery Cape Features once tede GR ERG AE RA EN SEGE Ge EKG beagleboardtoys com Page 7 of 24 BeagleBone Battery Cape System Reference Manual Revision A NOTES 6 Page 8 of 24 BeagleBone Battery Cape System Reference Manual Revision A 1 0 Introduction This document is the System Reference Manual for the BeagleBone Battery Cape an add on board for the BeagleBone This document is intended as a guide to assist anyone purchasing or who are considering purchasing the board to understand the overall design and usage of the BeagleBone Battery Cape from the system level perspective The design is subject to change without notice as we will work to keep improving the design as the product matures The key sections in this document are Section 2 0 Change History Provides tracking for the changes made to the System Reference Manual Section 3 0 Overview This is a high level overview of the BeagleBone Battery Cape Section 4 0 Features and Specification Provided here are the features and electrical specifications of the board Section 5 0 System Architecture and Design This section provides information on the overall architecture and design of the BeagleBone Battery Cape This is a very detailed section that goes into the design of each circuit on the board Section 6 0 Mechanical Information is provided here on the dimensions of the BeagleBone Battery Cape Secti2. Ge ee ee 17 9 1 SYSTEM BLOCK DIAGRAM iese kegel ses er Gee Eg eds cse ecu see ceo e ence ea Oca Res gede GEE ee Re 17 5 MA M ee RE 18 5 3 BOOST CONVERTER AR EO N N EE N N Ote N 20 54 AE EE AN OE RE N E EE N 21 5 4 1 EEPROM Ada Ge ee ee ee ee Se ee ee ee ee ee ee Ee ee ee be 21 S ID DE BURE SA EE RE EE EE RD EE NR 22 6 0 MECHANICAL INFORMATIODON cscccsscsscssssssssccssccssssssecsccccsescsscscsccscesssssssceccccsescsscssccescesssssees 23 7 0 DESIGN MATERIALS SE 24 beagleboardtoys com Page 6 of 24 BeagleBone Battery Cape System Reference Manual Revision A Figures Figure 1 The BeagleBone Battery ape ut ee ke nerit We EDEN Dee 11 Figure 2 Battery Cape key components di Rek um ee Ge ie ee RE 14 Figure 3 BeagleBone Battery Cape High Level Block Diagram 17 Figure 4 Battery Holder Configuration sees gs Ries dd 18 Figure 5 Battery voltage level dividere epe is gee Ee Ee 19 Figure 6 Boost converter CIECUIL eoo e esse NEGEER ES Dee dS 20 Figure 7 BeagleBone Battery Cape 2 2 4 2 2 4 21 Figure 8 BeagleBone LCD3 Cape Dimensions Drawing eee 23 Tables Mable ds Change EE
3. The Power LED is located between the Power switch and the 10 position connector 4 4 Expansion Connectors The BeagleBone Battery Cape uses a standard stackable connector set for BeagleBone capes This set is composed of two 46 position connectors and one 10 position connector These connectors can be used to stack on a BeagleBone or be stacked by another cape 4 5 Switch There is a Power switch on the board next to the 10 position expansion connector This button is a standard tactile switch and mounted at right angle The PWR BUT signal which can also be accessed at expansion connector J2 is connected to the Power button When pressed and held for 10 seconds the Power button will turn off the mounted BeagleBone beagleboardtoys com Page 15 of 24 BeagleBone Battery Cape System Reference Manual Revision A 4 6 Mechanical Specifications Size 3 55 x 3 40 Layers 2 PCB thickness 062 RoHS Compliant Yes 4 7 Electrical Specifications Table 3 is the electrical specification of the external interfaces to the BeagleBone Battery panel Table 3 Battery Electrical Specifications Specification Min Typ Max Unit Power Input Voltage VBAT 1 8 3 5 5 V Output Voltage 5 0 V Environmental Temperature range 0 85 C beagle o gt toys com Page 16 of 24 AMS 3 BeagleBone Battery Cape System Reference Manual Revision A 5 0 System Architecture and Design T
4. ese se es voos ds ed bes ie eo eed ee dee sede Ge eed Ge dees ee be oe ed eo oe Ge GE 10 2 1 CHANGEHISTOBY i N N Ene YE 10 30 BEAGLEBONE BATTERY CAPE OVERVIEW 11 eM MES eH NN TET 11 3 12 INTHE BOX ERR ER EE OE EO EE ON 12 3 3 GETTING STARTED oe EE ee ie Ge De De ee RE EE N vba neas OE ED Ee ER DE 12 34 REPAIRS 2555 iiie DE N Meu eii 12 4 0 FEATURES AND SPECIFICATIONS eere esee ee ee se se se ee ee ee ee se se tasa ses e Ge asses e Ge asse sese toca 13 4 1 KEY COMPONENT LOCATIONS eere ne n n eene nennen e n 14 4 2 BATTERY HOLDERS eene eere OE RE NE OE N 15 4 32 INDICATORS ER ER RE dede edens venu N RE N 15 4 4 EXPANSIONCONNECTORS ees ee ee ee ee ees se se se se Ee Ee Ee Ee Ee Ee Ee Ee Ee ee aO Ee Ee Ee Ee Ee ee setate sese sese ee eee ee ee 15 45 SWIECH AE ER EN N N N OT ER EE N 15 4 6 MECHANICAL SPECIFICATIONS eeue sees ee ee ee ee ee ee ee n een etete Ee ee Ee Ee Ee Ee Ee ee Ee Ee Ee Ee ee ee ee ee tenete nene ee nene ee ee nen ee ee 16 4 1 ELECTRICAL 6 55 be tus sube sq ve sabe DE be boss eu be be Eg GE 16 5 0 SYSTEM ARCHITECTURE AND DESIGN eere se se ee ee ese se se se ee ee ese se se Ge ee ee ee ee
5. input AIN4 on expansion connector J2 Since the analog inputs on BeagleBone are at 1 8V level a voltage divider is required to bring VBAT to a third of its voltage level Therefore AIN4 will read 1V when VBAT is at its maximum voltage level 3V Figure 5 display the voltage divider for battery voltage level input kop Page 18 of 24 A BeagleBone Battery Cape System Reference Manual Revision A VBAT DGND Figure 5 Battery voltage level divider PR eeste Page 19 of 24 b Y BeagleBone Battery Cape System Reference Manual Revision A 53 Boost Converter The Battery Cape uses TPS61032 to generate a stable output voltage to power rail VDD_SV of BeagleBone TPS61032 provides high efficient power conversion and is capable of delivering output current up to 1A at 5V at a supply voltage down to 1 8V The converter can be disabled to minimize battery drain During shutdown the load is completely disconnected from the battery A low EMI mode is implemented to reduce ringing and in effect lower radiated electromagnetic energy when the converter enters the discontinuous conduction mode The device is put into operation when the EN pin is pulled high This pin on the Battery Cape is connected to VBAT therefore the boost converter will start operation as soon as VBAT reaches 3 0V The internal start up cycle will start with the pre charge phase During this phase the output capacitor is charged to a value close to
6. of 24 A BeagleBone Battery Cape System Reference Manual Revision A 5 42 I2C Bus The EEPROMS on each expansion board is connected to I2C2 For this reason I2C2 must always be left connected and should not be changed by SW to remove it from the expansion header pin mux 2 signals require pull up resistors Each board must have a 5 6K resistor on these signals With four resistors this will be an affective resistance of 1 4K if all Capes were installed beagleboardtoys com Page 22 of 24 BeagleBone Battery Cape System Reference Manual Revision A 6 0 Mechanical Information This section provides information on the mechanical aspect of the BeagleBone Battery Cape Figure 8 is the dimensions of the BeagleBone Battery Cape 3 40 3 55 Figure 8 BeagleBone LCD3 Cape Dimensions Drawing kop Page 23 of 24 A BeagleBone Battery Cape System Reference Manual Revision A 7 0 Design Materials Design information can be found at BeagleBoardToys wiki http beagleboardtoys com wiki index php title BeagleBone Battery Provided there is Schematic in PDF Schematic in OrCAD Manufacturing files o PCB Gerber o PCB Layout Allegro Bill of Materials System Reference Manual This document These design materials are SUPPORTED and DO NOT constitute a reference design Only community support is allowed via resources at BeagleBoard org discuss THERE IS NO WARRANTY FOR THE DESIGN MATERIA
7. related directives 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 retund THE FOREGOING 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 The user assumes all responsibility and liability for proper and safe handling of the goods Further the user indemnifies BeagleBoardtoys com from all claims arising from the handling or use of the goods Due to the open construction of the product it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge 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 BeagleBoardtoys com currently deals with a variety of customers for products and therefore our arrangement with the user is not exclusive BeagleBoardtoys com assumes no liability for applications assistance customer product design software performance or infringement of patents or services described herein 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 temp
8. BeagleBone Battery Cape System Reference Manual Revision A BeagleBone Battery Cape Rev A System Reference Manual Revision A June 20th 2012 beagleboardtoys com Page 1 of 24 a BeagleBone Battery Cape System Reference Manual Revision A THIS DOCUMENT This work is licensed under the Creative Commons Attribution Share Alike 3 0 Unported License To view a copy of this license visit http creativecommons org licenses by sa 3 0 or send a letter to Creative Commons 171 Second Street Suite 300 San Francisco California 94105 USA All derivative works are to be attributed to BeagleBoardtoys com For more information see http creativecommons org license results one license_code by sa For any questions concerns or issues submit them to support beagleboardtoys com BEAGLEBONE BATTERY CAPE DESIGN These design materials referred to in this document are NOT SUPPORTED and DO NOT constitute a reference design Only community support is allowed via resources at Beagleboardtoys com support THERE IS NO WARRANTY FOR THE DESIGN MATERIALS TO THE EXTENT PERMITTED BY APPLICABLE LAW EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND OR OTHER PARTIES PROVIDE THE DESIGN MATERIALS AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES MERCHANTABILITY AND beagle o gt toys com Page 2 of 24 AR e Beagle
9. Bone Battery Cape System Reference Manual Revision A FITNESS FOR A PARTICULAR PURPOSE THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE DESIGN MATERIALS IS WITH YOU SHOULD THE DESIGN MATERIALS PROVE DEFECTIVE YOU ASSUME THE COST OF ALL NECESSARY SERVICING REPAIR OR CORRECTION We mean it these design materials may be totally unsuitable for any purposes beagleboardtoys com Page 3 of 24 BeagleBone Battery Cape System Reference Manual Revision A BeagleBoardToys provides the enclosed product s under the following conditions This evaluation board kit is intended for use for ENGINEERING DEVELOPMENT DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by BeagleBoardtoys com to be a finished end product fit for general consumer use Persons handling the product s must have electronics training and observe good engineering practice standards As such the goods being provided are not intended to be complete in terms of required design marketing and or manufacturing related protective considerations including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards This evaluation board kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility restricted substances RoHS recycling WEEE FCC CE or UL and therefore may not meet the technical requirements of these directives or other
10. LS TO THE EXTENT PERMITTED BY APPLICABLE LAW EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND OR OTHER PARTIES PROVIDE THE DESIGN MATERIALS AS IS WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE DESIGN MATERIALS IS WITH YOU SHOULD THE DESIGN MATERIALS PROVE DEFECTIVE YOU ASSUME THE COST OF ALL NECESSARY SERVICING REPAIR OR CORRECTION We mean it these design materials may be totally unsuitable for any purposes beagleboardtoys com Page 24 of 24
11. battery cells to the battery holders Each holder should only hold one cell 3 As soon as battery cells are installed the BeagleBone will power on Note Due to holder configuration BeagleBone will power on as soon as two battery cells on one wing are installed This is normal You can keep installing battery cells on the other wing 4 The Power LED on the Battery Cape and BeagleBone should be lit You can start using your BeagleBone 3 4 Repairs If you feel the board is in need of repair follow the RMA Request process found at http www beagleboardtoys com support rma Do not send the board in for repair until an RMA authorization has been provided Do not return the board to the distributor unless you want to get a refund You must get authorization from the distributor before returning the board beagleboardtoy com Page 12 of 24 BeagleBone Battery Cape System Reference Manual Revision A 4 0 Features and Specifications This section covers the specifications of the BeagleBone Battery Cape and provides a high level description of the major components and interfaces that make up the board Table 2 provides a list of the BeagleBone Battery Cape s features Table 2 BeagleBone Battery Cape Features Feature Power Supply 3 0V via Lithium battery cells Holder s 4 AA battery holders PCB 3 55 x 3 40 2 layers Indicators Power LED EEPROM Cape Address EEPROM Two 46 position connectors Expan
12. eratures and voltages For additional information on BeagleBoardtoys com environmental and or safety programs please contact visit BeagleBoardtoys com No license is granted under any patent right or other intellectual property right of BeagleBoard org covering or relating to any machine process or combination in which such BeagleBoardtoys com products or services might be or are used Mailing Address Beagleboardtoys com 1380 Presidential Dr 100 Richardson TX 75081 U S A jc Page 4 of 24 A BeagleBone Battery Cape System Reference Manual Revision A WARRANTY The BeagleBone Battery Cape is warranted against defects in materials and workmanship for a period of 90 days from purchase This warranty does not cover any problems occurring as a result of improper use modifications exposure to water excessive voltages abuse or accidents All boards will be returned via standard mail if an issue is found If no issue is found or express return is needed the customer will pay all shipping costs Before returning the board please visit Beagleboardtoys com support To return a defective board please request an RMA at http www beagleboardtoys com support rma Page 5 of 24 BeagleBone Battery Cape System Reference Manual Revision A Table of Contents JU GUI HO 5 EE ENE EO N 7 Um 7 1 0 INTRODUCTION Rm 9 2 0 CHANGE HISTORWV sossesieed sedes
13. his section provides a high level description of the design of the BeagleBone Battery Cape and its overall architecture 51 System Block Diagram Figure 3 is the high level block diagram of the BeagleBone Battery Cape POWER 2 1 LED i x m U1 VBAT 5V BOOST CONVERTER TPS61032 com go L GPIO1_16 AIN4 DO HOMZ ZOO DO HOMZ ZOO U2 EEPROM J3 CAT24C256W rc PWR_BUTTON POWER SWITCH rz OY e Figure 3 BeagleBone Battery Cape High Level Block Diagram kop Page 17 of 24 A BeagleBone Battery Cape System Reference Manual Revision A 52 VBAT The BeagleBone Battery Cape is powered from 4 single Lithium AA battery cells These cells will provide power to the VBAT power rail which is the input to the boost converter When installed 4 battery cells are connected as two sets in parallel each sets consists of two cells in series Since the nominal voltage of each AA cell is 1 5V two cells in series will provide a maximum voltage of 3 0V to VBAT By having two series groups of battery cells in parallel more current can be supplied to the boost converter Figure 4 shows the battery holder configuration VBAT VBAT J5 2460 J7 2460 DGND DGND Figure 4 Battery Holder Configuration The voltage level of VBAT can be monitored by an analog
14. on 7 0 Design Materials This section provides information on where to get the design files beagleboardtoys com Page 9 of 24 BeagleBone Battery Cape System Reference Manual Revision A 2 0 Change History 2 1 Change History Table 1 tracks the changes made for each revision of this document Table 1 Change History Rev Changes Date By EE Lo Page 10 of 24 BeagleBone Battery Cape System Reference Manual Revision A 3 0 BeagleBone Battery Cape Overview 31 Descriptions The BeagleBone Battery Cape provides a portable power solution for BeagleBone boards and its Capes This Cape provides 5V power supply to the BeagleBone using 4 Lithium AA battery cells Power will be provided to BeagleBone s VDD 5V power rail as soon as battery cells are installed The BeagleBone Battery cape is also equipped with a power switch a power indicator LED and an EEPROM for muxing configuration Figure 1 below is a picture of the board Figure 1 The BeagleBone Battery Cape beagleboardtoys com Page 11 of 24 BeagleBone Battery Cape System Reference Manual Revision A 3 2 In The Box The final packaged BeagleBone Battery Cape Rev A product will contain the following items 1 BeagleBone Battery Cape 1 Wiki information card 3 3 Getting Started Following the instructions below to start using your BeagleBone Battery Cape 1 Mount the Battery Cape on the BeagleBone 2 Install 4 AA Lithium
15. ormation that will allow the SW to identify the board and to configure the expansion headers pins as needed EEPROMS are required for all Capes sold in order for them to operate correctly when plugged in the BeagleBone The EEPROM used on this cape is the same one as is used on the BeagleBone a CAT24C256 The CAT24C256 is a 256 kb Serial CMOS EEPROM internally organized as 32 768 words of 8 bits each It features a 64 byte page write buffer and supports the Standard 100 kHz Fast 400 kHz and Fast Plus 1 MHz protocol Figure 7 is the design of the EEPROM circuit VDD 3V3 VDD 3V3 R17 10K 2 2 SCL gt VCC 2C2 SDA lt gt A TP1 lt T POINT A SW DIP 2 NC DGND Address 0x Figure 7 BeagleBone Battery Cape EEPROM 5 41 EEPROM Address In order for each Cape to have a unique address a board ID scheme is used that sets the address to be different depending on the order in which it is stacked onto the main board A two position dipswitch or jumpers is used to set the address pins of the EEPROM It is the responsibility of user to set the proper address for each board Address line A2 is always tied high This sets the allowable address range for the expansion cards to 0x54 to 0 57 other I2C addresses can be used by the user in the design of their Capes But these addresses must not be used other than for the board EEPROM information kop Page 21
16. sion Connector E 10 position connector beagle o gt toys com Page 13 of 24 AMS 3 BeagleBone Battery Cape System Reference Manual Revision A 4 4 Key Component Locations Figure 2 below shows the top side locations of key components on the PCB layout of the BeagleBone Battery Cape EEPROM CONNECTOR BATTERY HOLDER BATTERY HOLDER BOOST CONVERTER CONNECTORS Figure 2 Battery Cape key components Page 14 of 24 ZF BeagleBone Battery Cape System Reference Manual Revision A 4 2 Battery Holders The BeagleBone Battery Cape features 4 battery holders distributed equally on each side of PCB Holders on each wing are mounted on the opposite sides of the PCB These holders are the 2460 model and provided by Keystone Each holder can hold a single AA battery cell Four Battery holders are configured as 2 parallel sets on both wings of the Battery Cape Each set consists of 2 holders populated on opposite sides of the PCB The holders in each set are connected in series Thus if both holders in one set are installed with battery cells 5V will be provided to power rail VDD 5V right away Installing the other set will provide more current to the boost converter 4 3 Indicators There is one indicator on the board and this indicator is the Power LED D2 The Power LED indicates that power from battery cells is applied to the VDD 5V power rail which is used to power the BeagleBone
17. the input voltage Until the output voltage is reached the boost switch current limit is set to 40 of its nominal value to avoid high peak currents at battery during startup Output voltage of the boost converter is determined by voltage divider resistors R4 and R9 The maximum output voltage is 5 5V In this case R4 and R9 are chosen to be 180K and 1 74M respectively to set the output voltage to be 5 35V 350mV will be dropped across Schottky diode D1 to provide 5V to power rail VDD_SV The SYNC pin is connected to Ground to enable the power save mode The LBI input is pulled low to disable the low battery detector circuit The LBO output which is mapped to GPIO1_16 will stay at high impedance Figure 6 is the boost converter circuit 5V 1 5A VBAT VDD 5V 7447779006 TPS61032RSA DI 4 DOON t i VOUT Hg pi swe ne HI PMEG1020EJ e VOUT3 R4 VDD D2 Ins Ee a 74M c2 LTST C190GKT 5 RE 11 EN NC x 10uF 10V 470 10V lt ki 4 MUS im pl T7 mm Ne IPOWER 5 DGND D ND EE lt E Se PGNDI TS em x PGND2 7 lt 52 16 D ND 2 E ps R m 5 S10 7 DGND U DGND DGND DGND DGND D ND Figure 6 Boost converter circuit Page 20 of 24 BeagleBone Battery Cape System Reference Manual Revision A 54 EEPROM The BeagleBone Battery Cape has an EEPROM containing inf
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