Texas Instruments BQ2004 Evaluation Module for NiCd/NiMH, linear DV2004L1 DV2004L1 Fiche De Données
Codes de produits
DV2004L1
JP2 DSEL
Display select
JP3 VSEL
Voltage termination select
JP4 TM1
TM1 setting
JP5 TM2
TM2 setting
JP6 NOC
Select number of cells
JP7
Auto discharge-before-charge select
Fixed Configuration
The DV2004L1 board has the following fixed character-
istics :
istics :
■
V
CC
(4.75–5.25V) is regulated on-board from the sup-
ply at connector J1 (DC: GND).
■
LEDs indicate charge status.
■
Charge initiates on the later application of the bat-
tery or DC, which provides V
tery or DC, which provides V
CC
to the bq2004.
Pin DCMD may be tied to ground through JP7 for auto-
matic discharge-before-charge. With JP7 open, a toggle
of switch S1 momentarily pulls DCMD low and initiates
a discharge-before-charge. The bq2004 output activates
FET Q1, allowing current to flow through an external
current-limiting load between BAT and LOAD on con-
nector J1.
matic discharge-before-charge. With JP7 open, a toggle
of switch S1 momentarily pulls DCMD low and initiates
a discharge-before-charge. The bq2004 output activates
FET Q1, allowing current to flow through an external
current-limiting load between BAT and LOAD on con-
nector J1.
As shipped from Benchmarq, the DV2004L1 frequency-
modulated linear regulator is configured to a charging
current of 1.13A. This current level is controlled by the
value of sense resistor R
modulated linear regulator is configured to a charging
current of 1.13A. This current level is controlled by the
value of sense resistor R
SNS
by the relationship:
I
0.225V
R
CHG
=
SNS
The value of R
SNS
at shipment is 0.200
Ω. This resistor
can be changed depending on the application.
The suggested maximum I
CHG
for the DV2004L1 board
is 3A. Q4 must be mounted to an appropriate heat
sink.
sink.
The maximum cell voltage (MCV) is scaled to 1.8V/cell.
Note: Use the bqCharge diskette to calculate the
RB1/RB2 resistors to adjust MCV.
RB1/RB2 resistors to adjust MCV.
With the provided NTC thermistor connected between
THERM and SNS, values are: LTF = 10°C, HTF = 49°C,
and TCO = 50°C. The
THERM and SNS, values are: LTF = 10°C, HTF = 49°C,
and TCO = 50°C. The
∆T/∆t settings at 30°C (T
∆T
) are:
minimum = 0.82°C/minute, typical = 1.10°C/minute.
The thermistor is identified by the serial number suffix
as follows:
as follows:
Jumper-Selectable Configuration
The DV2004L1 must be configured as described below.
INH (JP1): Enables/disables charge inhibit (see bq2004
data sheet).
data sheet).
TM1 and TM2 (JP4 and JP5): Select fast charge
safety time/hold-off/top-off (see bq2004 data sheet).
safety time/hold-off/top-off (see bq2004 data sheet).
Number of Cells (JP6): A resistor-divider network is
provided to select 4 to 10 cells (the resulting resistor
provided to select 4 to 10 cells (the resulting resistor
2
DV2004L1
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
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
RB25
User-selectable
RB24
10
RB23
8
RB22
6
RB21
5
Rev. B Board