Texas Instruments BQ24023 bqTINY-II Evaluation Module BQ24023EVM BQ24023EVM Datenbogen

5



-II) Evaluation Module

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Input DC voltage, VI(DC)

VREG + 0.5

5.0

5.2

V

Battery charge current(1), IO(CHG)

0.7

1.0

A

Power dissipation

 ICHG  

×

 (V(DC+) – V(BAT+))

1.5

W

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This input voltage maximum is a function of the maximum allowable power dissipation on the device.  The current level is
programmed for 0.7 A.  If the programmed charge is changed, then the maximum input voltage needs to be adjusted.  
PMAX(IC) = 1.5 W = ICHG (V(DC+) – V(BAT+)).  The device has a maximum recommended operation of 6.5 VDC.

This section shows the test setups used, and the tests performed, in evaluating the EVM. See the
bq24020/bq24023 datasheet (SLUS549) for complete details on operation and specifications for the
charger device.

The bq24020/bq24023 EVM board requires a regulated 5-VDC, 1-A power source or a USB, 0.5-A port
maximum), to provide input power and a single-cell Li-Ion or Li-Pol battery pack.

If powered from an USB, 0.1-A port, make sure ISET2 is pulled low to program the board for the

100mA charge.  Skip any test steps that program the UUT to 0.5 A.

The test setup connections and jumper setting selections are configured for a stand-alone evaluation but
can be changed to interface with external hardware such as a microcontroller.

J1–DC+

Power supply positive connection, preset to 5.0-VDC, 1.2-A current limit. Can also be powered by J2 (USB) if J1
power is absent.

J1–DC–

Power supply return connection, ground

J2–USB Plug

USB 0.5-A port – source for charging when J1 source is absent

J5–BAT+

Positive battery pack terminal

J5–BAT–

Negative battery pack terminal, BAT–, is common with DC–

J5–TS/TTE

No connection – R4 is set to 20 k

Ω

 to bias the TS signal in a charging state (bq24020) or to enable timers (TTE) for

bq24023.  See datasheet (SLUS549) to activate TS for bq24020. Connection provides for optional external control.

J5–BAT–

Return for thermistor (when used)

J3 (jumper)

ISET2 program – 0.5A (HIGH) | 0.1 A (LOW)

J4 (jumper)

CE (charge enable) – HIGH | LOW

J6 (jumper)

BIAS power for EVM (jumper to active source) – DC+ | USB

J7 (jumper)

STAT1 indication location – LED (EVM) | EXT

J9 (jumper)

STAT2 indication location – LED (EVM) | EXT

J8–STAT1

External monitor hardware if J7–EXT is jumpered (not jumpered from factory)

J8–STAT2

External monitor hardware if J9–EXT is jumpered (not jumpered from factory)

J10 –CE

External CE  control (TTL) –  LOW–Enabled, HIGH–Disabled  (remove jumper J4 when using J10–CE)  EVM set
up for local control with jumper J4–LOW installed

J10–ISET2

External USB load control (TTL) – HIGH (0.5 A) | LOW (0.1 A) (remove jumper J3 when using J10–ISET2. EVM set
up for local control with jumper J3–0.1-A installed.

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Factory jumper selections are shown in BOLD