DV2000S1 and DV2000TS1
DV2000S1 and DV2000TS1
Multi-Chemistry Switching Charger
Development System
Features
Ø
Safe management of fast charge for NiCd, NiMH, or
Li-Ion battery packs
Ø
On-board switching regulation for up to 3A charge
current (set to 1A for shipment)
Ø
Fast-charge termination by peak voltage, minimum
current (Li-Ion), maximum temperature, or
maximum charge time
Ø
Programmable charge rate and time-out
Ø
Programmable top-off option for NiMH packs
Ø
Trickle charge for conditioning deeply discharged
batteries
Ø
Charge-status LED
Ø
Direct battery connection
General Description
The DV2000S1 and DV2000TS1 are complete development and evaluation environments for bq2000
multi-chemistry charge- control ICs. The DV2000S1 and
DV2000TS1 support up to 4 Li-Ion or 10 NiCd/NiMH
cells and can be user-programmed for other cell counts.
Connection Descriptions
J1
Charge qualification precedes fast charge. During qualification, full-charge current is inhibited if the battery
voltage or temperature is outside predetermined and
user-defined thresholds, indicating a battery pack that
is deeply discharged, shorted, hot, or cold. During the
qualification interval, the LED flashes at a 1Hz rate. In
the case of a low battery voltage, the IC applies a
low-current trickle charge in an attempt to revive the
battery or to close the pack protector’s discharge switch.
When battery voltage and temperature reach the required thresholds, full charge begins.
The bq2000 completes the fast charge with the appropriate charge algorithm. If the voltage on BAT input rises
to the internal VMCV threshold, the IC assumes a Li-Ion
battery. Otherwise, the bq2000 assumes NiCd/NiMH
chemistry. The user can further customize the algorithm
by programming the device for top-off option
(NiCd/NiMH only) and time-out period.
THERM
Thermistor connection
BAT-
Negative battery terminal and
thermistor return
BAT+
Positive battery terminal
N/C
No connection
DC-
Charger supply ground
DC+
Charger supply positive
JP1
Top-off selection for NiCd or NiMH
JP2
Number of cell selection for Li-Ion
JP3
Number of cell selection for NiCd or
NiMH
Fixed Configuration
Please review the bq2000 data sheet before using the
DV2000S1 and DV2000TS1 boards.
The DV2000S1 and DV2000TS1 boards have the following
fixed characteristics :
SLUU006A–June 1999—Revised OCTOBER 2000
Rev. D Board
1
DV2000S1 and DV2000TS1
An external DC supply is required to power the
board. Please see the Recommended DC Operating
Conditions.
between the THERM and BAT- contacts on J1,
temperature values are as follows:
VCC (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.
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 required adjustment to the Q3 drive for higher charging
currents:
300Ω
2A < ICHG < 3A
91Ω
91Ω
Temperature Cut-Off (TCO): 45°C
Top-off Option (JP1): This jumper enables (Y) or disables (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.
R18
300Ω
–
Please note that a “user” selectable position is also provided 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.
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.
Not installed
High-Temperature Fault (HTF): 40°C
Number of Cells Selection (JP2, JP3): These jumpers 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.
1 
 1

ICHG = 0.05 ∗ 
+
 R7 R19 
ICHG < 1A
1A < ICHG < 2A
–
The DV2000S1 and DV2000TS1 must be configured as
described below. See the jumper selection diagram.
As shipped, the DV2000S1 and DV2000TS1 buck
mode-switching regulators are configured for charging current of 1A. This current is controlled by the
value of sense resistors, R7 and R19 in the following equation:
R17
Low-Temperature Fault (LTF): 0°C
Jumper-Selectable Configuration
Charge initiates on the later application of the battery or DC to the board.
Charge Current
–
Not installed
With the provided thermistor (part number
2322-640-63103, manufacturer Philips) connected
Charge Rate
Time-out (Li-Ion)
Time-out
(NiCd/NiMH)
C/4
C/3
C/2
640 minutes
480 minutes
320 minutes
320 minutes
240 minutes
160 minutes
Figure 2. C/4 Time-out with No Top-off
Figure 1. C/2 Time-out with Top-off
Rev. D Board
2
DV2000S1 and DV2000TS1
Recommended DC Operating Conditions
Symbol
Description
Minimum
Typical
Maximum
Unit
Notes
IDC
Maximum input current
-
-
3
A
VDC
Maximum input voltage
10 (see note)
-
25
V
DC+ to DC-
VBAT
BAT input voltage
-
-
24
V
BAT+ to BAT-
VTHERM
THERM input voltage
0
-
5
V
Therm to BAT-
ICHG
Battery charge current
-
-
3
A
Note:
VDC must be above the battery charge voltage. Voltage drops across D5, Q3, L1, and R7 must be considered when calculating minimum VDC.
C
User Specified*
160 minutes
User Specified
80 minutes
User Specified
Setup Procedure
*Please see the bq2000 data sheet for the equation.
1.
Figures 1 and 2 are examples of time-out with top-off
jumper configurations.
Configure the board for the number of cells and
charging current as described in the above sections.
2.
Set the jumpers for charge rate/time-out and top-off
option.
3.
Connect the battery pack to BAT+ and BAT-.
4.
Connect the thermistor to THERM and BAT-.
5.
Connect the charging supply to J1. Please see the
Recommended DC Operationg Conditions.
Jumper Configuration Diagram
JP2
4
Li-Ion
3
Cell Count 2
1
J1
JP3
User
10
NiCd/NiMH 8
Cell Count 6
5
4
DC-
Y
N
N
Y
N
Y
DC+
N
Y
N
Y
N
C/4
320
JP4
Y
C/3
240
JP1
N/C
C/2
160
BAT+
C
80
BAT-
USER
THERM
DV2000s1.eps
Rev. D Board
3
DV2000S1 and DV2000TS1
DV2000S1 and DV2000TS1 Board Schematic
Rev. D Board
4
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