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Contents
Section
Introduction
The bq2050/H Power Gauge IC provides battery capacity
monitoring in a single 16-pin SOIC or DIP package. The
EV2050/H Evaluation Board provides a useful means to
test bq2050/H functionality and easily interface with the
device over the RS-232 port of a PC. The bq2050/H fea-
tures:
n
Battery capacity monitoring functions
LED display of available charge
n
DQ serial I/O port communications functions
n
Functional Description
The EV2050/H provides functional evaluation of the
bq2050/H IC on a PCB. The actual implementation of a
bq2050/H-based design will be significantly smaller in
size. See the bq2050/H data sheet for bq2050/H specifi-
cations.
June 1995
Power Gauge™ Evaluation Board
Page No.
1
1
2
2
2
3
3
3
3
6
7
8
Power Source
9
The bq2050/H derives its V
10
source or from the battery connected to the BAT+ (J1) and
BAT- (J2) terminal blocks. Refer to Table 4 in Using the
11
bq2010--A Tutorial for Gas Gauging for the proper size of
R17 as part of the V
tion Board is shipped with a 200KΩ resistor for R17.
Current Path
The bq2050/H uses a sense resistor (R16) on the nega-
tive terminal of the battery to measure charge and dis-
charge of the battery. This resistor may be changed if
necessary. The system load is connected between the
BAT+ (J1) and RET- (J2) terminal blocks (see the sche-
matic in Appendix C).
Parameter Programming
The EV2050/H is programmed by the segment program-
ming pins, using jumpers PROG1-PROG5. The pro-
gramming pins determine:
n
Programmed full count
Scale factor
n
Discharge compensation factor
n
1
EV2050/H
from either an external
CC
regulation. The EV2050/H Evalua-
CC
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Table of Contents
Summary of Contents for Benchmark Power Gauge EV2050/H
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Page 1: Table Of Contents
EV2050/H Power Gauge™ Evaluation Board Contents Section Page No. Introduction EV2050/H Functional Description EV2050/H Contents EV2050/H Connections EV2050/H Configuration Installing the User Interface Program Using the EV2050/H Program Main Menu Monitor Screens Data Logging Program Menu Measure V Screen Power Source Appendix A: AP50 User's Guide The bq2050/H derives its V from either an external... -
Page 2: Ev2050/H Contents
EV2050/H Self-discharge compensation (on/off) shipped with all pins in the high position. Please refer to the bq2050/H data sheet for the proper configuration of PROG EV2050/H Contents JP16 LED enable (LCOM connection). This jumper connects the LCOM pin of the Each package contains the following items: bq2050/H to the LEDs. -
Page 3: Installing The User Interface Program
EV2050/H sense resistor (R16) is in series with the ENTER Press the ENTER key to select the value negative terminal of the battery. The currently being displayed for a parame- EV2050/H board is supplied with a 0.1, ter, or to perform a function selected by 1% 3W resistor. - Page 4 EV2050/H program continually updates the monitor screen. Average V This is the average battery current. conditions change, the new values are displayed. Current Time Time of day in HH:MM:DD, 24-hour nota- Time During discharge, this is the time re- tion. Remaining maining at the average current (NAC / Avg.
- Page 5 EV2050/H It remains latched until charging is de- Pack voltage This is the cell voltage at the SB pin of tected, at which time it is cleared. the bq2050/H. Valid This is the state of the VDQ bit in FLGS1. Capacity This is the state of the capacity inaccurate Discharge...
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Page 6: Data Logging
EV2050/H It is possible to change the values of the NAC and LMD Data Logging parameters from the screen using the F1 and F2 func- tion keys as follows. The data log is activated from the Main Menu by selecting the Data Log function. -
Page 7: Program Menu
EV2050/H LMD value in mAh NAC value in mAh Bit Meaning Avg. Average V battery current Overload flag state Discharge 1–3 Not used Current 4–6 Discharge rate PACK V Pack voltage Not used CAC value in mAh The log records should be readable by most spreadsheet programs. -
Page 8: Measure Vos Screen
EV2050/H formation in terms of A, mA, mAh, and value slightly lower than (within 5%) the mWh in relation to battery capacity and rated battery capacity is recommended. current. The default value is 0.1. Values Self- Set at C per day for lithium-ion. from 0.005 to 0.256 are saved in the bat- Discharge tery ID RAM byte of the bq2050/H. -
Page 9: Appendix A: Ap50 User's Guide
EV2050/H increases the resolution of the test. A “beep” signals test –> R## completion. If R## is entered in response to –>, where ## is an applica- Appendix A: AP50A User's ble address in HEX format, AP50 returns the value at that location from the EV2050/H. -
Page 10: Appendix B: Troubleshooting
EV2050/H Confirm the battery is attached between BAT+ and Appendix B: Troubleshooting BAT– (J1 and J2). If the EV2050/H Main Menu does not appear after start- Push S1. SEG1 LED should be on indicating that ing EV2050/H, then communication to the bq2050/H has the bq2050/H is properly powered. -
Page 11: Appendix C: Ev2050/H Schematic
EV2050/H Appendix C: EV2050/H Schematic June 1995... - Page 12 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.
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