Texas Instruments BQ2003 Evaluation Module for NiCd/NiMH, switchmode, up to 6A DV2003S2 DV2003S2 Fiche De Données
Codes de produits
DV2003S2
JP2 TM1
TM1 setting
JP3 TM2
TM2 setting
JP4 NOC
Select number of cells
Fixed Configuration
The DV2003S2 board has the following fixed characteris-
tics :
tics :
V
CC
(4.75–5.25V) is regulated on-board from the supply
at connector JP6 DC+.
LEDs indicate charge status and temperature fault
status.
status.
Pin CCMD is grounded, providing charge initiation on
the later application of the battery or DC+, which pro-
vides V
the later application of the battery or DC+, which pro-
vides V
CC
to the bq2003.
Pin DCMD is pulled to ground through R12. A toggle of
switch S1 momentarily pulls DCMD high and initiates a
discharge-before-charge. The bq2003 output activates
FET Q4, allowing current to flow through an external
current-limiting load between BAT+ and DSCHG on con-
nector JP6.
switch S1 momentarily pulls DCMD high and initiates a
discharge-before-charge. The bq2003 output activates
FET Q4, allowing current to flow through an external
current-limiting load between BAT+ and DSCHG on con-
nector JP6.
Trickle current is limited by a 150
Ω/2W resistor R10 be-
tween DC+ and BAT+ (maximum potential across R10 =
17.3V). Note that too large a voltage between DC+ and
BAT+ may exceed the wattage rating of resistor R10.
17.3V). Note that too large a voltage between DC+ and
BAT+ may exceed the wattage rating of resistor R10.
As shipped from Benchmarq, the DV2003S1 buck-type
switch-mode regulator is configured to a charging current of
2.35A. This current level is controlled by the value of sense
resistor R26 by the relationship:
switch-mode regulator is configured to a charging current of
2.35A. This current level is controlled by the value of sense
resistor R26 by the relationship:
I
0.235V
R26
CHG
=
The value of R26 at shipment is 0.100
Ω. This resistor can
be changed depending on the application.
The suggested maximum I
CHG
for the DV2003S2 board is
3A. A location for a second sense resistor (R27) is pro-
vided on the DV2003S2 board. R27 is electrically in par-
allel with R26, which assists in user modification of I
vided on the DV2003S2 board. R27 is electrically in par-
allel with R26, which assists in user modification of I
CHG
,
if needed.
Charge current can be halted at any time via external
stimulus. Connector JP5 provides a +5V DC source (+V)
and an inhibit input (IN) node for this function. To in-
hibit charge current, the JP5 inhibit input (IN) is driven
by +5V DC.
stimulus. Connector JP5 provides a +5V DC source (+V)
and an inhibit input (IN) node for this function. To in-
hibit charge current, the JP5 inhibit input (IN) is driven
by +5V DC.
To re-initiate charge, remove the voltage
source from the inhibit input.
The maximum cell voltage (MCV) setting is 1.8V.
With the provided NTC thermistor connected between
THERM and BAT–, values are: LTF = 10°C, HTF = 45°C,
and TCO = 50°C. The
THERM and BAT–, values are: LTF = 10°C, HTF = 45°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 DV2003S1 must be configured as described below.
DVEN (JP1): Enables/disables -
∆V termination (see
bq2003 data sheet).
TM1 and TM2 (JP2 and JP3): Select fast charge safety
time/hold-off/top-off (see bq2003 data sheet).
time/hold-off/top-off (see bq2003 data sheet).
Number of Cells (JP4): A resistor-divider network is
provided to select 2 to 16 cells (the resulting resistor
value equals N – 1 cells). RB1 is a 200K
provided to select 2 to 16 cells (the resulting resistor
value equals N – 1 cells). RB1 is a 200K
Ω resistor, and
RB2 (R16–R25) is jumper-selected.
Temperature Disable: Connecting a 10K
Ω resistor be-
tween THERM and BAT– disables temperature control.
2
DV2003S2
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
Enabled (high)
1 [ 2 3 ]
Disabled (low)
Jumper Setting
Pin State
[ 1 2 ] 3
High
1 [ 2 3 ]
Low
1 2 3
Float