An external DC supply is required to power the

board. Please see the Recommended DC Operating

Conditions.

V

DC input on J1.

LED1 indicates the charge status according to the

bq2000 data sheet.

Charge initiates on the later application of the bat-

tery or DC to the board.

As shipped, the DV2000S1 and DV2000TS1 buck

mode-switching regulators are configured for charg-

ing current of 1A. This current is controlled by the

value of sense resistors, R7 and R19 in the follow-

ing equation:

I0.05

1

R7

1

R19

CHG

=∗

+













At shipment, the value of R7 is 0.05Ω and R19 is not

connected. These resistors can be changed depending on

the application. The maximum charge current for this

board is 3A.

The DV2000S1 and DV2000TS1 can be safely operated

at currents up to 1A without adjusting the drive current

for Q3. Please refer to the following table for the re-

quired adjustment to the Q3 drive for higher charging

currents:

Charge Current

R17

R18

I

Not installed

Not installed

1A < I

300Ω

300Ω

2A < I

91Ω

91Ω

With the provided thermistor (part number

2322-640-63103, manufacturer Philips) connected

between the THERM and BAT- contacts on J1,

temperature values are as follows:

–

Low-Temperature Fault (LTF): 0

°C

–

High-Temperature Fault (HTF): 40

°C

–

Temperature Cut-Off (TCO): 45

°C

Jumper-Selectable Configuration

The DV2000S1 and DV2000TS1 must be configured as

described below. See the jumper selection diagram.

Number of Cells Selection (JP2, JP3)

: These jump-

ers set the number of cells for either Li-Ion or

NiCd/NiMH batteries. These jumpers should be changed

only if the battery is absent or if DC power is turned off.

Please note that only one jumper (either JP2 or JP3)

should be selected at a time.

Please note that a “user” selectable position is also pro-

vided on JP3. This position can be used to configure the

board for other cell counts by selecting an appropriate

value for R28. Please refer to the bq2000 data sheet for

the equation.

Top-off Option (JP1)

: This jumper enables (Y) or dis-

ables (N) the top-off option for NiMH batteries. This

jumper has no effect on Li-Ion batteries.

Charge Rate and Time-out (JP4):

The following

charge rate and time-out are available. Please note that

for each charge rate and time-out settings, there are two

possible selections: one with top-off enabled (Y) and one

with top-off disabled (N). This selection must match the

jumper setting of JP1.

Charge Rate

Time-out (Li-Ion)

Time-out

(NiCd/NiMH)

C/4

640 minutes

320 minutes

C/3

480 minutes

240 minutes

C/2

320 minutes

160 minutes

2

DV2000S1 and DV2000TS1

Figure 1. C/2 Time-out with Top-off

Figure 2. C/4 Time-out with No Top-off

Rev. D Board