Datasheet

JP2 TM1 TM1 setting
JP3 TM2 TM2 setting
JP4 NOC Select number of cells
P1 External source control
Fixed Configuration
The DV2003L1 board has the following fixed character
-
istics :
V
CC
(4.75–5.25V) is regulated on-board from the supply
at connector J1 DC+.
LEDs indicate charge status and temperature fault status.
Pin CCMD is grounded, providing charge initiation on
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 DIS output acti-
vates FET Q4, allowing current to flow through an ex-
ternal current-limiting load between BAT+ and DSCHG
on connector J1.
Trickle current is limited by a 150
Ω
/2W resistor R10 be-
tween DC+ and BAT+ (maximum potential across R10 =
17.3V). The trickle current may be increased by adding a
parallel resistor from the DC+ source to XTRKL on con-
nector J1. Note that too large a voltage between DC+
and BAT+ may exceed the wattage ratings of these resis-
tors.
If enabled, the linear regulator U2 regulates up to 1.5A
from the supply on connector J1 DC+ to the battery on
BAT+. Because the LM317 current is set by R13 (I =
1.25/R13), increasing this resistance provides regulation
to a lower current. It is set to 1.25A (R13 = 1
Ω
).
When the linear regulator U2 is disabled, the output
MOD on connector J1 is used to control an off-board cur
-
rent source connected to the positive battery terminal.
Note that when an external source is used, the supply to
connector J1 DC+ still provides both the board V
CC
source and a trickle output at BAT+.
Charge current can be halted at any time via external
stimulus. Connector J2 provides a +5V DC source (+V)
and an inhibit input (IN) node for this function. To in
-
hibit charge current, the J2 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 GND or BAT–, values are: LTF = 10°C,
HTF = 44°C, and TCO = 50°C. The average
∆
T/
∆
t set
-
ting (T
∆
T
) is 1.04°C/minute.
The thermistor is identified by the serial number suffix
as follows:
Jumper-Selectable Configuration
The DV2003L1 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).
Number of Cells (JP4): A resistor-divider network is
provided to select 4 to 14 cells (the resulting resistor
value equalsN–1cells). RB1 is a 200K
Ω
resistor, and
RB2 (R16–R22) is jumper-selected.
2
DV2003L1
Identifier Thermistor
K1 Keystone RL0703-5744-103-S1
(blank) Philips 2322-640-63103
F1 Fenwal Type 16, 197-103LA6-A01
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
Closed Jumper Number of Cells
R22 14
R21 12
R20 10
R19 8
R18 6
R17 5
R16 4