EV2014 Gas Gauge Evaluation Board User Manual
Contents
1. Q1 2N7000 D15 Ss 4 ie vec 5 6 7 8 9 Lio L 11 12 39 R17 J1 R4 R5 R6 R7 SRB SRI R10S R11 o gt t I 200K 249K gt 301K 348K gt 402K 453K 499K 549K e L 300K 29 2 JP9 100 B SEL D13 1N752A 4 JP8 GE DAT DIV REF 5006000 OD SB 9 III C3 ER R12 0 1 49 9K yal UT ae Glen LM358N j R1 D1 J5 R22 20K R3 ois 7 R2 2 Wi 100K DQ Q2 D3 0 1 H R33 D6 2N7000 P 9 o 5 100 weer 1N4148 U1 SE o 3 Y LM358N TS oT ax 1N4148 C2 er ARIS Day VO H Y Y D2 1N4148 D5Y 1N4148 Y EV2014 Rev A 8 8 96 2 of 2 Rev B Board 11 IMPORTANT NOTICE Texas Instruments and its subsidiaries Tl reserve the right to make changes to their products or to discontinue any product or service without notice and advise customers to obtain the latest version of relevant information to verify before placing orders that information being relied on is current and complete All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement including those pertaining to warranty patent infringement and limitation of liability Tl warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty Specific testing of all parameters of each device i2. mmm UNITRODE EV2014 Gas Gauge Evaluation Board Contents Section Page No Introduction EV2014 Functional Description EV2014 Contents EV2014 Connections EV2014 Configuration Installing the User Interface Program Using the EV2014 Program Main Menu Monitor Screen Digital Magnitude Filter Menu Data Logging Display Program Menu Measure Vos Screen Appendix A AP14 User s Guide oO 0 0 O D D D bb NY q Fa m Appendix B Troubleshooting Appendix C EV2014 Schematic KA Pp Introduction The bq2014 Gas Gauge IC provides battery capacity monitoring in a single 16 pin SOIC or DIP package The EV2014 Evaluation Board provides a useful means to test bq2014 functionality and easily interface with the device over the RS 232 port of a PC The bq2014 fea tures m Battery capacity monitoring functions a LED display of available charge m DQ serial UO port communications functions Functional Description The EV2014 provides functional evaluation of the bq2014 IC on a PCB The actual implementation of a bq2014 based design will be significantly smaller in size 10 97 INTERFACE SECTION ta ENCHMARQ EV2014 REV ey GND me EMT Cat DONE 1 D Louis See the bq2014 data sheet Dec 1994 B or later for bq2014 specifications Power Source The bq2014 derives its Vcc from either an external source or from the battery connected to the BAT J1 and BAT J2 terminal blo
3. Modifying NAC and LMD It is possible to change the values of the NAC and LMD parameters from the screen using the F1 and F2 func tion keys as follows Changing NAC F1 1 Press the F1 key The NAC field is highlighted 2 Enter the value in mAH and press the ENTER key to store the value Note Changing NAC disqualifies a subsequent LMD update Changing LMD F2 1 Press the F2 key The LMD field is highlighted 2 Enter the value in mAH and press the ENTER key to store the value Benchmarq BQ2014 Evaluation Board Digital Magnitude Filter Menu Enter DMF Value from List below Current Setting 0 XXmV Vsrd Current Threshold DMF mv Rsns XXXXmA Suggested DMF Settings Default Value ESC to main menu XXX 0 XXmV Vsrq DMF Vsrd nV Vsrq mV 15 0 60 0 75 100 0 45 0 56 150 0 30 0 38 175 0 26 0 32 200 0 23 0 28 F1 to modify DMF Rev B Board Figure 3 Digital Magnitude Filter Menu Data Logging The data log is activated from the Main Menu by select ing the Data Log function A filename to be used and the log sample period must be entered For example Log Data to Filename lt filename ext gt Enter Sample Period 10 sec or greater lt xx gt Opening Data Log File When the data log is started the Monitor Screen dis plays the number of the current log record between the time and date fields at the top of the screen To termi nate the data log press the ESCAPE
4. D F2 to modify LMD Figure 2 Real Time Monitor Screen Rev B Board EV2014 Final EDV Battery Replaced Capacity Inaccurate Capacity Inaccurate Count FLGS1 FLGS2 cates the present discharge is not valid for LMD update This is the state of the EDVF flag as pro grammed in the Display Program Menu The value of EDVF is 0 1V lower than EDV1 The EDVF flag latches ON if Vsp drops below the EDVF threshold value It remains latched until charging is de tected at which time it is cleared This is the state of the battery replaced flag It is set BRP yes if the battery valid condition returns after setting the battery removed flag The battery re placed flag is cleared if the battery is dis charged to the EDV1 level or if it is charged to NAC LMD This flag is set after a EV2014x initialization This is the state of the capacity inaccurate bit in FLGS1 It is set CI yes to indicate that the battery capacity has not been up dated during the last 64 charge cycles This is the number of charge cycles be tween an LMD update This counter is reset to zero when NAC LMD after a valid LMD update This indicates the present state of the FLGS1 resistor This indicates the present state of the FLGS2 resistor Digital Magnitude Filter Menu This menu sets the digital magnitude filter in the bq2014 see Figure 3 Any value from 1 to 255 is valid Suggested values are displayed on the menu
5. and in good condition If you have any problems please con tact your Benchmarg representative or call Benchmargq EV2014 Connections The connections for the EV2014 are described below Please refer to the attached schematic in conjunction with these descriptions JP1 JP8 JP9 JP10 JP14 Battery cell divider JP1 JP6 are used to divide the battery voltage by 5 to 10 JP7 and JP8 are user definable but are configured for 11 and 12 cells on this board Vcc Supply This jumper is used to se lect the Vcc supply for the bq2014 When JP9 is near Q2 the supply is taken from the BAT input and is regulated by the bq2014 and Q2 When JP9 is near R13 the Vcc supply is provided by LBAT If Vcc is supplied by LBAT it must not ex ceed the specified Vcc voltage range in the bq2014 data sheet Dec 1994 B or later Programming pins 1 5 These jumpers are used to configure the programming pins When the jumper is positioned near the PROG designator the pins are pulled high If the jumper is in the other position the pins are pulled low If the Rev B Board JP16 EMPTY DSP jumper is removed the pins are in the high impedance state The board is shipped with all pins in the high position Please refer to the bq2014 data sheet Dec 1994 or later for the proper con figuration of PROG1 5 LED enable LCOM connection This jumper connectss the LCOM pin of the bq2014 to the LEDs The board is shipped with th
6. key The file is closed and data logging is terminated The data log record contains fields of ASCII data sepa rated by tab characters The field names and descrip tions in record order are listed below TIME Time record written in seconds LMD LMD value in mAh NAC NAC value in mAh Avg Average Vsr battery current Discharge Current BATV Battery cell voltage EV2014 FLAGS1 Binary setting of FLAGS1 flags Bit Meaning O EDVF flag state 1 EDVI flag state 2 Not used 3 VDQ valid discharge 4 Capacity inaccurate 5 Battery removed flag state 6 Battery replaced flag state 7 Charge active flag state FLAGS2 Binary setting of FLAGS2 flags Bit Meaning 0 Overload flag state 1 3 Not used 4 6 Discharge rate 7 Charge rate The log records should be readable by most spreadsheet programs Sense Resistor 0 10 Display Full RELATIVE Self Discharge Rate 1 47 NAC day Number of Cells X EDV1 X XX Programming Pin Configuration Prog 1 Prog 4 Prog 2 Prog 5 Prog 3 Prog 6 Benchmarq BQ2014 Programming Menu Scale Factor 1 320 PFC Count XXXXX PFC mVH XXXX Battery Capacity 9999 mAH F1 SR F2 NOC F3 El DV1 ESC to main menu Figure 4 Display Program Menu Rev B Board EV2014 PFC Select the programmed full count using Display Prog ram Menu JP6 and JP7 Note that the selected PFC and the sense resistor value are used to This menu is accessed by selecting the l
7. pin 16 of the bq2014 to determine if it is above 3V but below 6 5V If the LED is on and the EV2014x Main Menu still does not appear try using AP14 to establish com munication Appendix A describes AP14 If communication cannot be established using AP14 the problem is either the RS 232 port in the PC or the EV2014x interface section Please con tact Benchmarq if the interface section is not work ing properly on the EV2014x board A DISP 3 EMPTY 4 CHG 5 DONE els VCC J4 T CNTL SR1 SRI Lan sr A Sp 220K 220K 220K 220K 220K JP10 9 JP11 JJP12 J JP13 9 JP14 Bre ere are are are Lo K 3lo K CH PG1 PG2 PG3 PG4 PG5 220K 220K 220K 220K 220K C6 Vee SR2 lt SR2 lt SR2 lt SR2 ji R30 D7 REF GC Via seat D8 Da R31 D9 Dis seca e N 470 As spe D10 E Ka R32 DT SEGA Ge BQ2014 A secs SR2 R13 R21 GA S1 Y sar 100K I DISCHARGE J2 R15 l RET 1 BAT 2 100K C5 R16 0 1 0 1 3W EV2014 Rev A 8 8 96 1 of 2 Rev B Board 10 EV2014 Appendix C EV2014 Schematic Continued
8. C real time clock affects the operation of the EV2014 For proper operation the EV2014 should not be operated from a DOS shell program If the PC is a notebook or portable type it may be config ured to save battery power by adjusting the clocks ac cording to the activity under way Configure the notebook to run in High Performance mode for reliable communication between the EV2014 and the PC The EV2014 UIP terminates if communication with the EV2014 board is lost Start the User Interface Program as follows C gt EV2014 EV2014 Using the EV2014 Program EV2014 is a menu driven program Almost all of the functions and entries are made by positioning the high lighted cursor on the function desired and pressing the ENTER key or by typing a value and then pressing the ENTER key Key functions are as follows ARROW Use the arrow keys to move the high keys lighted cursor around the screen ENTER Press the ENTER key to select the value key currently being displayed for a parameter or to perform a function selected by the highlighted cursor ESCAPE Press the ESCAPE key to escape from key any function back to the main menu or to escape from any parameter value screen back to the menu displaying that parame ter F3 key Press the F3 key to display a help file for the selected function or parameter Main Menu The Main Menu appears after the EV2014 program has started If this menu does not appear communication wit
9. cks Refer to Table 4 in Using the bq2010 A Tutorial for Gas Gauging for the proper size of R17 as part of the Vcc regulation The EV2014 Evaluation Board is shipped with a 200KQ resistor for R17 Current Path The bq2014 uses a sense resistor R16 on the negative terminal of the battery to measure charge and discharge activity This resistor may be changed if necessary The system load is connected between the BAT J1 and PACK J2 terminal blocks see the schematic in Appen dix C Parameter Programming The EV2014 is programmed by the segment program ming pins using jumpers PROG1 PROG6 The pro gramming pins determine a Programmed full count m Scale factor Rev B Board EV2014 Self discharge rate Display mode EV2014 Contents Each package contains the following items ul EV2014 PC Board This includes the bq2014 sample current regula tors programming jumpers battery divider resis tors and the PC serial port interface EV2014 DQ RS 232 Cable EV2014 v2 0 User Interface Program Diskette This program runs on any AT compatible computer equipped with a standard RS 232 COM1 COM2 COMB or COMA serial port and provides the user with a complete menu driven system to control monitor and log data from the EV2014x Evaluation Board The User Interface Program communicates with the bq2014 over the DQ serial I O port using the RS 232 interface Please check to make sure that all items are present
10. h the EV2014 has not been established please refer to Appendix B Troubleshooting if the EV2014x does not display the Main Menu The Main Menu shows six functions that may be acti vated see Figure 1 Use the cursor keys arrow keys to position the highlighted cursor over the function to be activated and press the ENTER key For help press the F3 key and a help note about the function appears Press the ESCAPE key to exit from the EV2014 pro gram The Main Menu functions are as follows lt Initialize gt Sends a reset command to the bq2014 lt Monitor gt Activates a screen from which the bq2014 activity is monitored on a real time basis lt Digital Activates a screen from which the Digital Filter gt Magnitude Filter can be changed The default filter value is 0 3mV 0 38mV The bq2014 data sheet Dec 1994 B or later defines valid options for this filter lt Data Log gt Allows entering a file name to which bq2014 data will be logged and the log ging period in seconds When the log is Rev B Board EV2014 lt Display Program Menu gt lt Measure Vos gt activated the display changes to the Monitor screen with a top display of Logging Record xx Activates a screen showing the current program settings for the bq2014 This allows the user to determine the ap parent offset voltage of the bq2014 under test A minimum of 6 minutes are re quired to complete the Vos measurement which has a resolution
11. is jumper enabled Empty output This connection allows the user to monitor the EMPTY output pin provided on the bq2014 This pin is high impedance when the single cell di vided battery voltage is less than the EDVF threshold final end of discharge warning Display input DISP pin DSP is con nected in parallel with the push button switch S1 provided on the EV2014 board An external switch configuration can be made using DSP When the EV2014 is floating and detects charging or discharg ing the LED outputs are active to reflect the charge state When the DISP input is pulled low the LEDs reflect the charge state EV2014 Configuration The EV2014 Evaluation Board may be used with or without the DQ RS 232 Interface Program The Evalua tion Board should first be configured before connecting the battery or the RS 232 cable Step 1 Step 2 Step 3 Enabling the LEDs optional JP16 should be installed Connecting the power supply The EV2014 can operate from power pro vided by the battery being monitored or from LBAT Set the battery divider JP1 JP8 to the correct number of bat tery cells prior to connecting the battery If the bq2014 will be powered from the battery connect JP9 closer to Q2 If the bq2014 will be powered from an external supply connect JP9 closer to R13 Important Connect the battery ONLY after setting JP1 JP8 and JP9 Connecting the RS 232 cable Connect the cable provided to the serial p
12. ischarged or if it is idle no charging taking place OVERLOAD is displayed if the voltage drop across the sense resistor exceeds the Vsri threshold Please note that the ap pearance of CHARGE or DISCHARGE in dicators is rate dependent and may take some time after the application of a charging current or a discharge load de pending on the PFC and scale selected and the rate of charge or discharge being applied Benchmarg BQ2014 Evaluation Board Main Menu v2 3 lt Initialize gt lt Digital Filter gt lt Display Program gt lt Monitor gt lt Data Log gt lt Measure Vos gt Please enter the SR of cells in Display Program for Proper Operation ESC to exit program F3 for Help Rev B Board Figure 1 Main Menu VSR Step GG Step Charge Rate First EDV This is the value of the Vsr current step as defined in the bq2014 data sheet This is the lower four bits of the TMPGG register that correspond to the current NAC value relative to either the LMD or the original programmed full count as determined by PROG14 The GG step is reported as a step number from 0 to 15 with step 0 representing available capacity from 0 to Ve of full and 15 representing available capacity from 154 full to full Indicates whether the present charge is TRICKLE or FAST depending on the state of the charge rate CR bit in FLGS2 This is the state of the EDV1 flag as pro grammed in the Display Progra
13. m Menu The default is 1 05V The EDV1 flag latches ON if Nep drops below the EDV1 EV2014 threshold value It remains latched until charging is detected at which time it is cleared Cell voltage This is the cell voltage at the SB pin of the bq2014 Battery This multiplies the cell voltage by the voltage number of cells programmed in the Dis play Program Menu The default is one cell Battery This is the state of the battery removed Removed flag It is set BRM yes if one of the conditions indicating battery removed oc curs This flag is reset when the battery is replaced Valid This is the state of the VDQ bit in Discharge FLGS1 VDQ yes if the bq2014 is charged until NAC LMD VDQ no indi Benchmarq BQ2014 Evaluation Board Real Time Monitor Screen Time 99 99 99 EMPTY NAC 99999 mAH IMD Avg Vsr Current 9999mA Digital Filter Setting Activity XXXXX Charge Rate XXXX Valid Discharge XXX Cell Voltage XXX V Capacity Inaccurate XXX FIGS1 XXXXX XX CBBCVNEE HRRID DD GPM QUVV S LE ESC to main menu 2 FULL 99999 mAH 0 XXmV Vsrd 0 XXmV Vsrq Vsr Current Step First EDV XXX Final EDV XXX Batt Voltage XXX V Capacity Inaccurate Count XXX Fl Date 99 99 9999 Sense Resistor Value XXXm Q Time remaining 9999 min Temp Step XX XX GG Step XX Batt Rem vd XXX Batt Repl d XXX F1 to modify NAC ICS2 XXXX___X CDDDNNNO RRRR V 210UUUL
14. n a register basis AP14 uses a driver to communicate with the EV2014 over serial port on a PC AT personal computer AP14 The AP14 utility is started by executing AP14A EXE After AP14 is started the following prompt is displayed Select COM Port lt 1234 gt Commands The user can respond with various commands at the prompt Pressing Q causes the program to terminate gt Pressing the key displays following menu The following commands are available This display is shown A Send break Q Quit and return to DOS RH Read at address SH Scan at address WH Write at address value These commands may be used to send or receive data from the EV2014x gt A EV2014 If A is entered in response to gt then a break bit is sent to the EV2014x This may be used to restart the com munication if a problem appears Ifthe prompt does not return immediately then proper communication has not been established please refer to Appendix B for trouble shooting procedures gt R If R is entered in response to gt where is an applicable address in HEX format AP14 returns the value at that lo cation from the EV2014x The addresses are defined in the bq2014 data sheet For example gt R03 causes the display to show RO3 where is the current NAC value in HEX format Address 00 is used to read and display all readable reg isters gt S If S i
15. of 0 15mV per 6 minutes Monitor Screen This screen monitors real time changes of the bq2014 see Figure 2 The program continually updates the monitor screen As conditions change the new values are displayed Time Empty Full Date NAC LMD Time of day in HH MM DD 24 hour nota tion This indicates the current value for GG in the TMPGG register of the bq2014 The capacity value is given in 4th steps Current date in MM DD YY notation NAC register values multiplied by the scale value and divided by the sense resis tor value to give mAh Last Measured Discharge expressed in terms of mAH This is the 8 bit LMD reg ister value multiplied by the scale value Sense Resis tor Value Average Vsr Current Time Remaining Digital Filter Setting Temp Step Activity times 256 and divided by the sense resistor to give mAh This is the sense resistor value from the Programming menu This is the average battery current During discharge only this is the time re maining at the average current NAC Avg Vsr current This is the value of the digital magnitude filter This is a display of the active tempera ture step which ranges from 0 for tem peratures lt 30 C to 12 for temperatures gt 80 C This indicates the charging discharging activity occurring with the battery CHARGE is displayed if the battery is charging while DISCHARGING is dis played if the battery is being d
16. ort of any PC Please ensure that no memory resident programs are using this serial port Step 4 Connecting the load The external load is connected between BAT and RET J2 on the EV2014 A sense resistor R16 is in series with the negative terminal of the battery The EV2014 board is supplied with a 0 1 1 3W resistor Please ensure that the dis charge load does not exceed the Vsr speci fication for the bq2014 R16 may be changed to a different value resistor Installing the User Interface Program The User Interface Program named EV2014 runs on any PC compatible computer The program may be run from the disk provided or it may be installed on any di rectory on the computer s hard disk To run the program from the hard disk simply copy all the files from the disk supplied to the hard disk All the files should re side in the same directory The User Interface Program installs a driver to control the DQ RS 232 interface This driver asks which COM port is connected to the EV2014 Evaluation board If communication is not established with the EV2014 board the Main Menu does not appear Please refer to Appendix B Troubleshooting if the program does not establish communication with the EV2014 The EV2014x uses the PC AT real time clock to provide the proper bit timing for serial communication with the bq2014 The modem control lines are used as the single wire serial interface to the bq2014 Any TSR that uses the P
17. plays indicates the programming Factor scales using JP8 and JP9 Cont Pin of he woe O H Z or L de onfigura pending on the state of the program pins Like the sense resistor the scale factor is tion Please refer to the bq2014 data sheet for used to develop meaningful information for the programmed full count tables battery full and available capacity indications PFC Count Program full count from Table 2 from the bq2014 data sheet further details Present DMF Setting XXXmV Vsrd Benchmarg EV2014 Evaluation Board V Measurement XXXmV Vsrq Current Threshold DMF mv Rsns XXXXmA Do you want to test Vos Y N Calculated Vos Vos XXXmV over last xxxx seconds Elapsed time XXXX seconds Note There must be no charge discharge activity on the bq2014 for this test to be valid Running the test for a longer period of time increases the Vos measurement resolution This test requires a minimum of 6 minutes before any value is displayed Figure 5 VOS Measurement Screen Rev B Board Measure Vos Screen This screen is used to measure the Vos of the bq2014 see Figure 5 A minimum of 360 seconds are required to perform this test Pressing the ESC key terminates the test in progress Operating the test for a longer period increases the resolution of the test A beep signals test completion Appendix A AP14A User s Guide The AP14 utility AP14A EXE is used to communicate with the bq2014 o
18. s entered in response to gt where is a valid bq2014 address in HEX format AP14 continuously reads and displays the value at that location The ad dressed are defined in the bq2014 data sheet For exam ple gt 503 causes the display to show Address 3 after XXX XX sec where is the value at location 03 and XXX XX is the number of seconds between changes in this value gt W If W is entered in response to gt where is an ap plicable address in HEX format and is the value to be written AP14 writes the value to that location The ad dresses are defined in the bq2014 data sheet For exam ple gt W05 A0 causes the program to write AO in location 05hex LMD register Rev B Board EV2014 Appendix B Troubleshooting If the EV2014x Main Menu does not appear after start 6 ot ing EV2014x then communication to the bq2014 has not been established Please check the following 1 Confirm the proper serial port is being used 2 Confirm the battery divider is properly set for the number of cells in the battery pack 3 Confirm JP5 and JP13 are properly set for either an external supply through LBAT J1 or the mi croregulator 4 Confirm the battery is attached between BAT and BAT J1 and J2 Appendix C EV2014 Schematic Push S1 SEG1 LED should be on indicating that the bq2014 is properly powered If the LED is not on check the battery voltage on
19. s not necessarily performed except those mandated by government requirements CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH PERSONAL INJURY OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE CRITICAL APPLICATIONS TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN LIFE SUPPORT DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER S RISK In order to minimize risks associated with the customer s applications adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards Tl assumes no liability for applications assistance or customer product design TI does not warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other intellectual property right of TI covering or relating to any combination machine or process in which such semiconductor products or services might be or are used Te publication of information regarding any third party s products or services does not constitute Te approval warranty or endorsement thereof Copyright 1999 Texas Instruments Incorporated
20. t Display Pro determine the initial battery full capacity gram gt function on the Main Menu The programming mAh represented by the PFC menu allows the user to set and observe the program state of the bq2014 see Figure 4 To change the bq2014 Battery This display indicates the battery capacity PFC programming reconfigure jumpers JP6 JP10 and Capacity represented by dividing the PFC by the initialize the bq2014 The reset allows the bq2014 to sense resistor In practice picking a PFC read the program pins and sense resistor that provide a battery full value slightly lower than within 5 Sense Press F1 to enter the value of sense resis the rated battery capacity is recommended Resistor tor in ohms Typical values range from 0 02 to 0 1Q Self Select one of two available self discharge he Geet value de sed hy th Discharge rates depending on the application and is u EV2014 UIP to develop meaningful infor Rale battery ype usme JPO mation in terms of A mA and mAH in re Numberof Press F2 to enter the number of cells in lation to battery capacity and current Cells the battery stack This shows the battery The default value is 0 1 Values from pack voltage on the monitor screen SE ad Ln EDV1 Press F3 to enter the desired end of dis than 0 256 must be re entered each time charge voltage for the battery pack The EV2014x is started default value is 1 05V for the bq2014 Scale Select the scale factor from the available Program This dis
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