Datasheet

An external DC supply is required to power the
board. Please see the Recommended DC Operating
Conditions.
V
CC
(5V) for the bq2000 is regulated on-board from the
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
CHG
< 1A Not installed Not installed
1A < I
CHG
<2A
300Ω 300Ω
2A < I
CHG
<3A
91Ω 91Ω
With the provided thermistor (part number
2322-640-63103, manufacturer Philips) connected
between the THERM and BAT- contacts on J1,
temperature values areas 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