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EV2014X View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
EV2014X Gas Gauge and Fast Charge Evaluation Board TI
Texas Instruments TI
EV2014X Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
EV2014x
EV2014x Contents
Each package contains the following items:
1 EV2014x PC Board
This includes the bq2014 sample, current regula-
tors, programming jumpers, battery divider resis-
tors, and the PC serial port interface.
1 EV2014x DQ/RS-232 Cable
1 EV2014x (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 EV2014xx Evalua-
tion Board. The User Interface Program communi-
cates 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 con-
tact your Benchmarq representative or call Benchmarq.
EV2014x Connections
The connections for the EV2014x are described below.
Please refer to the attached schematic in conjunction
with these descriptions.
JP16
TM1
Fast charge timer setting 1
JP2
VSEL Voltage termination select
JP3
TM2
Fast charge timer setting 2
JP4, JP12 NOC Selects number of cells
JP5, JP13 LBAT Gas gauge power supply
JP6-P10 PROG# Gas gauge programming
JP11
LCOM LED enable
EV2014x Fixed Configuration
Charge initiates on the later application of the battery
or DC, which provides VCC to the bq2004.
As shipped from Benchmarq, the EV2014x buck-type
switch-mode regulator is configured to a charging cur-
rent of 2.25A. This current level is controlled by the
value of sense resistor RSNS by the relationship:
ICHG = 0.225V
RSNS
The value of RSNS at shipment is 0.100. This resistor
can be changed depending on the application.
The suggested maximum ICHG for the EV2014x board is
3A. The maximum cell voltage (MCV) setting is 1.8V.
The EV2014x gas gauge uses a 0.100sense resistor to
measure charge and discharge current.
Zener diode D11 is used to limit Q4 VGS per a given DC
voltage. The board is shipped with D5 shorted. The user
can modify this Zener diode for the application. Refer to
Table 1 for suggested D5 values for DC voltages.
With the provided NTC thermistor connected between
THERM and SNS, values are: LTF = 10°C, HTF = 45°C,
and TCO = 50°C. The T/t settings at 30°C (Tt) are:
minimum = 0.82°C/minute, typical = 1.10°C/minute.
The thermistor is identified by the serial number suffix
as follows:
Table1. Lookup Table for D11 Selection
+VDC Input
(Volts)
Below 15
15–18
18–21
21–24
24–27
27–30
30–32
32–35
Motorola
Part No.
Shorted
1N749
1N755
1N758
1N964A
1N966A
1N967A
1N968A
Nominal Zener
Voltage
0
4.3
7.5
10
13
16
18
20
The EV2014x board has the following fixed characteristics:
VCC (4.75–5.25V) for the bq2004 is regulated onboard
from the supply at connector J2 DC.
LEDs 1 and 2 indicate charge status.
LED3 can replace LED1 and LED2 and provide an op-
tional tri-color LED feature.
LEDs D4 through D8 indicate battery capacity in 20%
increments.
Jumper-Selectable Configuration
The EV2014x must be configured as described below.
TM1 and TM2 (JP3): Select fast charge safety
time/hold-off (see bq2004 data sheet, page 7).
Number of Cells (JP4, JP12): Two resistor-divider
networks are provided to select 4 to 10 cells.
Dec. 1996
2
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