Datasheet
Fixed Configuration
The DV2002L2/TL2 board has the following fixed char
-
acteristics:
V
CC
(4.75–5.25V) is regulated on-board from the supply
at connector JP4 (DC:GND).
LED
indicates charge status.
Charge initiates on the later application of the battery
or DC, whichprovidesV
CC
to the bq2002/T.
As shipped from Benchmarq, the DV2002L2/TL2 linear
regulator is configured to a charging current of 1.25A.
This current level is controlled by the value of sense re-
sistor R
7
by the relationship:
I=
1.25V
R
CHG
7
The value of R
7
at shipment is 1Ω. This resistor can be
changed depending on the application.
The suggested maximum I
CHG
for the DV2002L2/TL2
board is 1.5A. U2 must be mounted to an appropri-
ate heat sink.
The maximum cell voltage (MCV) is scaled to 2V/cell.
With the provided NTC thermistor connected between
THERM and BAT–,TCO = 50°C.
The thermistor is identified by the serial number suffix
as follows:
Jumper-Selectable Configuration
The DV2002L2/TL2 must be configured as described be
-
low.
INH (JP2): Enables/disables charge inhibit (see
bq2002/T data sheet).
TM (JP1): Selects fast charge safety time/top-off (see
bq2002/T data sheet).
Number of Cells (JP3): A resistor-divider network is
provided to select 4 to 10 cells (the resulting resistor
value equalsN–1cells). RB1 is a 100K
Ω
resistor, and
RB2 (RB20–RB25) is jumper-selected.
Temperature Disable: Connecting a 10KΩ resistor be-
tween THERM and BAT–disablestemperaturecontrol.
Setup Procedure
1. Configure TM, INH, and number-of-cells (NOC)
jumpers.
2. Connect the provided thermistor or a 10K
Ω
resistor
between THERM and BAT–.
3. Attach the battery pack to BAT+ and BAT–. For
temperature control, the thermistor must contact
the cells.
4. Attach DC current source to DC (+) and GND (–)
connections in JP4.
2
DV2002L2/TL2
Rev. C Board
Jumper Setting Pin State
[ 1 2 ] 3 Disabled (high)
1 [ 2 3 ] Enabled (low)
Jumper Setting Pin State
[ 1 2 ] 3 High
1 [ 2 3 ] Low
1 2 3 Float
Closed Jumper Number of Cells
R13 10
R12 8
R11 6
R10 5
R9 4
Input
Voltage Current Resistance Wattage
to 25V
1A 1.25
Ω
2W
1.5A 0.83
Ω
2W
Table 1. Lookup Table for R7 Selection
Identifier Thermistor
K1 Keystone RL0703-5744-103-S1
(blank) Philips 2322-640-63103
F1 Fenwal Type 16, 197-103LA6-A01
O1 Ozhumi 150-108-00(4)
S1 Semetic 103AT-2