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Setup
2.1 Setup
The bq2400X EVM board requires a DC power source to provide input power
and a single-cell lithium-ion or lithium-polymer battery to charge.
Note:
Other versions of the bq2400x IC can charge two-cell battery packs.
The test setup connections and jumper setting selections are listed below.
2.1.1
I/O Connections
Jack
J1–VCC
J1–GND
J9–+
J9– –
J9 – VSENSE
J10 – THERM
J10 – GND
2.1.2
Jumper-Selectable Configuration
Jumper
† This jumper enables/disables the IC for bq24001/2/3/4/5/6. For bq24007/8, this jumper enables/
disables the change timer.
‡ For bq24003/6/8 the evaluation board used two LED (red and green) in place of a single
dull-color LED. Therefore, when both LEDs are lit a yellow status is indicated.
2.2 Test Procedures
2.2.1
For Single-Cell Applications
Set up the evaluation board as described above, by making the necessary I/O
connections and jumper selections.
Note:
Before test and evaluation, it is important to verify that the maximum power
dissipation on the IC is not exceeded. Pmax = 2.3 W.
2-2
Connect to:
Power source positive output
Power source negative output
Positive lead of single lithium cell
Negative lead of single lithium cell
Tie to battery's positive terminal
Tie to thermistor lead in battery pack
Tie to other thermistor lead (may be GND)
Selection
J3
1-A charge, use two jumpers placed horizontally; no jumpers on J4
J4
0.5-A charge, use two jumpers placed horizontally, no jumpers on J3
J2
Adapter power good (APD) or battery's thermistor
†
J5
Enable, on or off
J6
Regulation voltage, 4.2 V or 4.1 V (single cell), 8.4 V or 8.2 V (double cell)
J7
Timer, 3-hour (float, no jumper), 4.5-hour, or 6-hour
J8
Stat2 green diode, connect for bq24002/3/5/6/8
P
= (V
– 3 V)
diss, single cell
I
‡
I
where V
= V
–0.1 V
CHG
I
CC
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