DV2003S2 datasheet(2/6 Pages) ETC2

2 / 6 page

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 :

VCC (4.75–5.25V) is regulated on-board from the supply

at connector JP6 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 VCC 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.

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.

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:

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 ICHG 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 ICHG,

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.

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

∆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:

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).

Number of Cells (JP4): A resistor-divider network is

provided to select 2 to 16 cells (the resulting resistor

value equalsN–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.

DV2003S2

Identifier

Thermistor

Keystone RL0703-5744-103-S1

(blank)

Philips 2322-640-63103

Fenwal Type 16, 197-103LA6-A01

Ozhumi 150-108-00(4)

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

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