|
Details, datasheet, quote on part number:EV2014
| |
| Part: | EV2014 |
| Category: | Others |
| Description: | Gas Gauge With 1-WIRE (DQ) Interface, 5 Led Drivers And Control Signals For The BQ2004 Fast Charge i |
| Company: | Texas Instruments, Inc. |
| Datasheet: | Download EV2014 datasheet File size : 411 kB |
| Request For quote: | Find where to buy EV2014
|
| |
Datasheet text preview:
EV2014
Gas Gauge Evaluation Board
Contents
Section 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 Appendix B: Troubleshooting Appendix C: EV2014 Schematic Page No. 1 1 2 2 2 3 3 3 4 6 6 7 8 9 10 11 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 blocks. 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 200K resistor for R17.
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 features:
n n n
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 Appendix C).
Battery capacity monitoring functions LED display of available charge DQ serial I/O port communications functions
Parameter Programming
The EV2014 is programmed by the segment programming pins, using jumpers PROG1-PROG6. The programming pins determine:
n n
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
Programmed full count Scale factor
Rev. B Board
1
EV2014
n n
Self-discharge rate Display mode
EV2014 Contents
Each package contains the following items: 1 EV2014 PC Board This includes the bq2014 sample, current regulators, programming jumpers, battery divider resistors, and the PC serial port interface. 1 1 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, COM3, or COM4) 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 and in good condition. If you have any problems, please contact your Benchmarq representative or call Benchmarq. JP16
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 configuration of PROG1-5. LED enable (LCOM connection). This jumper connectss the LCOM pin of the b q 2 0 1 4 t o t h e L E D s. T h e b o a r d i s shipped with this 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 divided battery voltage is less than the E DV F t h r e s h o l d ( f i n a l e n d - o f - d i s c h a r g e warning). Display input (DISP pin). DSP is connected 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 discharging, the LED outputs are active to reflect the charge state. When the DISP input is pulled low, the LEDs reflect the charge state.
EMPTY
DSP
EV2014 Connections
The connections for the EV2014 are described below. Please refer to the attached schematic in conjunction with these descriptions. JP1-JP8 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 select 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 exceed the specified VCC voltage range in t h e b q 2 0 1 4 d a t a s h e e t ( D e c. 1 9 9 4 B o r later). Programming pins 1-5. These jumpers are used to configure the programming pins. When the jumper is positioned near t h e P R O G # d e s i g n a t o r, t h e p i n s a r e pulled high. If the jumper is in the other position, the pins are pulled low. If the
EV2014 Configuration
T h e E V 2 0 1 4 E v a l u a t i o n B o a r d m ay b e u s e d w i t h o r without the DQ/RS-232 Interface Program. The Evaluation Board should first be configured before connecting the battery or the RS-232 cable. Step 1 Enabling the LEDs (optional) JP16 should be installed Step 2 Connecting the power supply The EV2014 can operate from power provided by the battery being monitored or f r o m L BAT + . S e t t h e b a t t e r y d i v i d e r (JP1-JP8) to the correct number of battery 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. Step 3 Connecting the RS-232 cable Connect the cable provided to the serial port of any PC. Please ensure that no
JP9
JP10-JP14
Rev. B Board
2
EV2014
memory-resident programs are using this serial port.
Using the EV2014 Program
EV2014 is a menu-driven program. Almost all of the functions and entries are made by positioning the highlighted 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 keys ENTER key U s e t h e a r r o w k e y s t o m o v e t h e h i g hlighted cursor around the screen. Press the ENTER key to select the value currently being displayed for a parameter, or to perform a function selected by the highlighted cursor. P r e s s t h e E S CA P E k e y t o e s c a p e f r o m any function back to the main menu, or to escape from any parameter value screen back to the menu displaying that parameter. Press the F3 key to display a help file for the selected function or parameter.
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 n e g a t i v e t e r m i n a l o f t h e b a t t e r y. T h e EV2014 board is supplied with a 0.1, 1% 3W resistor. Please ensure that the discharge load does not exceed the VSR specification 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 directory 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 reside 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 PC 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 configured to save battery power by adjusting the clocks acc o r d i n g t o t h e a c t i v i t y u n d e r w a y. C o n f i g u r e t h e 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>EV2014
ESCAPE key
F3 key
Main Menu
The Main Menu appears after the EV2014 program has started. If this menu does not appear, communication with 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 activated; 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 program. The Main Menu functions are as follows: Sends a reset command to the bq2014. Activates a screen from which the bq2014 activity is monitored on a real-time basis. Activates a screen from which the Digital 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. Allows entering a file name to which bq2014 data will be logged, and the logging period in seconds. When the log is
Rev. B Board
3
EV2014
activated, t h e d i s p l a y c h a n g e s t o t h e 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 apparent offset voltage of the bq2014 under test. A minimum of 6 minutes are required to complete the VOS measurement, which has a resolution of ±0.15mV per 6 minutes. Sense Resistor Value Average VSR Current Time Remaining 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 remaining at the average current (NAC / Avg. VSR current)
Digital This is the value of the digital magnitude Filter Setting filter. Temp Step This is a display of the active temperature step, which ranges from 0 (for temperatures 80°C). T h i s i n d i c a t e s t h e ch a r g i n g / d i s ch a r g i n g a c t i v i t y o c c u r r i n g w i t h t h e b a t t e r y. C H A R G E i s d i s p l ay e d i f t h e b a t t e r y i s charging, while DISCHARGING is displayed if the battery is being discharged, or if it is idle (no charging taking place). OVERLOAD is displayed if the voltage drop across the sense resistor exceeds the VSR1 threshold. Please note that the appearance of CHARGE or DISCHARGE indicators is rate-dependent, and may take some time after the application of a charging current or a discharge load depending on the PFC and scale selected, and the rate of charge or discharge being applied.
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 Time of day in HH:MM:DD, 24-hour notation. This indicates the current value for GG in the TMPGG register of the bq2014. The capacity value is given in 1 16th steps. Current date in MM/DD/YY notation. NAC register values multiplied by the scale value and divided by the sense resistor value to give mAh. L a s t M e a s u r e d D i s ch a r g e e x p r e s s e d i n terms of mAH. This is the 8-bit LMD register value multiplied by the scale value Activity
Date NAC
LMD
Benchmarq BQ2014 Evaluation Board Main Menu (v2.3)
Please enter the SR, # of cells in Display Program for Proper Operation
ESC to exit program
F3 for Help
Figure 1. Main Menu
Rev. B Board
4
EV2014
VSR Step GG Step 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 PROG1-4). The GG step is reported as a step number from 0 to 15, with step 0 representing available capacity from 0 to 1 16 of full, and 15 representing available capacity from 15 16 full to full. Indicates whether the present charge is T R I C K L E o r FA S T d e p e n d i n g o n t h e state of the charge rate (CR) bit in FLGS2. This is the state of the EDV1 flag as programmed in the Display Program Menu. T h e d e f a u l t i s 1 . 0 5 V. T h e E D V 1 f l a g latches ON if VSB drops below the EDV1 Cell voltage Battery voltage threshold value. It remains latched until charging is detected, at which time it is cleared. This is the cell voltage at the SB pin of the bq2014. This multiplies the cell voltage by the number of cells programmed in the Display Program Menu. The default is one cell. This is the state of the battery removed flag. It is set (BRM = yes) if one of the conditions indicating battery removed occurs. This flag is reset when the battery is replaced. This is the state of the VDQ bit in FLGS1. VDQ = yes if the bq2014 is charged until NAC = LMD. VDQ = no indi-
Charge Rate
Battery Removed
First EDV
Valid Discharge
Benchmarq BQ2014 Evaluation Board Real-Time Monitor Screen Time: 99:99:99 NAC: 99999 mAH EMPTY ****_____FULL LMD: 99999 mAH Date: 99-99-9999
Sense Resistor Value: XXXm Time remaining: 9999 min. Temp Step: XX GG Step: XX Batt. Rem'vd: XXX Batt. Repl'd: XXX
Avg Vsr Current: ± 9999mA
Digital Filter Setting: -0.XXmV=Vsrd +0.XXmV=Vsrq Activity: XXXXX Charge Rate: XXXX Valid Discharge: XXX Cell Voltage: XXX V Vsr Current Step: XX First EDV: XXX Final EDV: XXX Batt. Voltage: XXX V
Capacity Inaccurate: XXX FLGS1: X C H G S X B R P XXX_X BCVNE RID/D M QUV 1 X E D V F
Capacity Inaccurate Count: XXX FLGS2: X X X X CDDD RRRR 210 _ N / U _ N / U _ N / U X O V L D
ESC to main menu
F1 to modify NAC
F2 to modify LMD
Figure 2. Real-Time Monitor Screen
Rev. B Board
5
|
|
