Texas Instruments WCSP-Packaged bq24272, User Manual

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Test Summary
2.2.7 Software
Download bq2427xSW.zip from the charger's product folder, unzip the file, and double-click on the
SETUP.EXE file. Follow the installation steps.
Because the watchdog timer is enabled, it is recommended that you set the software's Reset Watchdog
Timer to reset every 5 seconds. Otherwise, after 30 seconds of operation, the IC enters Default mode.
Note that the 27-minute safety timer is not reset by this function and eventually times out if charging does
not complete, unless the Safety Timer Time Limit is expanded or disabled via the GUI. One way to reset
the safety timer is to allow the 30-second watchdog timer to expire. See Figure 3 in the data sheet for
more information about the timers.
Also, it is generally helpful to activate the Write On Change functions, in the upper left of the GUI window,
to ON. The Write On Change function writes any changes to the GUI's check boxes, drop-down boxes,
and registers to the IC. Otherwise, the user must click the WRITE button to write changes to the software.
Periodically click the READ button to find the IC's instantaneous status. Alternatively, the AutoRead
function can be activated, periodically updating the GUI with the IC's status.
2.3 Recommended Test Equipment Setup
1. For all power connections, use short, twisted-pair wires of appropriate gauge wire for the amount of the
current.
2. Set PS #1 for 6-V, 3-A current limit and then turn the supply off.
3. If BAT_Load as shown in Figure 1 is used, connect PS #2 set to approximately 3.1 V to the input side
(PS #2) of BAT_Load, then turn off PS #2.
4. Connect the output side of the battery or BAT_Load in series with CM #2 to J9 and J11 or J10 (BAT,
GND). Ensure that a voltage meter is connected across J9 or TP8 and J11 (BAT, GND).
5. bq24272 only: Connect the electronic load or resistor decade box in series with a current meter
(multimeter) to J6(SYS, GND). Ensure the electronic load is in current mode and set to 0 A or the
resistor decade box is set to the maximum resistance.
6. bq24272 only: Connect VM #3 across J4 or TP4 and J8 (SYS, GND).
7. Connect VM #4 across J12 and J14 (DRV, GND).
8. Connect J5 to the HPA172 kit by the 10-pin ribbon cable. Connect the USB port of the HPA172 kit to
the USB port of the computer. The connections are shown in Figure 4 .
Figure 4. Connections of HPA172 Kit
9. Ensure jumpers are at the default factory settings per Section 1.6
9 SLUU916 – April 2012 WCSP-Packaged bq24272/273 Evaluation Modules
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