unitrode EV2014 Manual Download Page 1

Contents

Section

Page No.

Introduction

1

EV2014 Functional Description

1

EV2014 Contents

2

EV2014 Connections

2

EV2014 Configuration

2

Installing the User Interface Program

3

Using the EV2014 Program

3

Main Menu

3

Monitor Screen

4

Digital Magnitude Filter Menu

6

Data Logging

6

Display Program Menu

7

Measure V

OS

Screen

8

Appendix A: AP14 User's Guide

9

Appendix B: Troubleshooting

10

Appendix C: EV2014 Schematic

11

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:

n

Battery capacity monitoring functions

n

LED display of available charge

n

DQ serial I/O 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.

See the bq2014 data sheet (Dec. 1994 B or later) for
bq2014 specifications.

Power Source

The bq2014 derives its V

CC

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 V

CC

regulation. The EV2014

Evaluation Board is shipped with a 200K

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:

n

Programmed full count

n

Scale factor

1

EV2014

Gas Gauge Evaluation Board

10/97

Rev. B Board

Summary of Contents for EV2014

Page 1: ...es functional evaluation of the bq2014 IC on a PCB The actual implementation of a bq2014 based design will be significantly smaller in size 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 Tutoria...

Page 2: ...h If the jumper is in the other position the pins are pulled low If the 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 JP16 LED enable LCOM connection This jumper connectss the LCOM pin of the bq2014 to the LEDs The board is shipped wi...

Page 3: ...014 UIP terminates if communication with the EV2014 board is lost Start the User Interface Program as follows C 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 ARR...

Page 4: ...tor Value This is the sense resistor value from the Programming menu Average VSR Current This is the average battery current Time Remaining During discharge only this is the time re maining at the average current NAC Avg VSR current Digital Filter Setting This is the value of the digital magnitude filter Temp Step This is a display of the active tempera ture step which ranges from 0 for tem peratu...

Page 5: ...l voltage by the number of cells programmed in the Dis play Program Menu The default is one cell Battery Removed This is the state of the battery 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 Discharge This is the state of the VDQ bit in FLGS1 VDQ yes if the bq2014 is charged until NAC LMD VDQ no ind...

Page 6: ...valid LMD update FLGS1 This indicates the present state of the FLGS1 resistor FLGS2 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 Modifying NAC and LMD It is possible to change the values of the NAC and LMD paramet...

Page 7: ... LMD LMD value in mAh NAC NAC value in mAh Avg Discharge Current Average VSR battery current BATV Battery cell voltage FLAGS1 Binary setting of FLAGS1 flags Bit Meaning 0 EDVF flag state 1 EDV1 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 Ov...

Page 8: ... initial battery full capacity mAh represented by the PFC Battery Capacity This display indicates the battery capacity represented by dividing the PFC by the sense resistor In practice picking a PFC and sense resistor that provide a battery full value slightly lower than within 5 the rated battery capacity is recommended Self Discharge Rate Select one of two available self discharge rates dependin...

Page 9: ...communication has not been established please refer to Appendix B for trouble shooting procedures R If R is entered in response to 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 R03 causes the display to show R03 where is the current NAC value in HEX format Address 00 is used to r...

Page 10: ...enu still does not appear try using AP14 to establish com munication Appendix A describes AP14 8 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 10 Rev B Board EV2014 CHG DISP DONE SR SB EMPTY DQ REF VSS SEG5 SEG4 SEG3 S...

Page 11: ...2K R8 453K R9 499K R10 549K R11 J5 1 2 JP8 100 R33 1N4148 D14 100 R22 1N751A D6 20K R1 100K R3 2N7000 Q2 1N4148 D3 LM358N U1 0 1 C1 0 1 C2 100K R2 1N4148 D4 1N4148 D5 1N4148 D1 LM358N U1 1N4148 D2 P1 1 2 3 4 5 6 7 8 9 REF BAT L B LBAT SB DQ DQ I O B SEL BAT DIV 12 11 10 9 8 7 6 5 EV2014 Rev A 8 8 96 2 of 2 Appendix C EV2014 Schematic Continued ...

Page 12: ...CONDUCTOR 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 ...

Page 13: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments EV2014 ...

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