Test Summary
Figure 2. BAT_Load (PR1010) Schematic
2.2.3
Load #2 Between SYS and GND
Although not required, a resistive load capable of sinking up to 3 A can be used.
2.2.4
Meters
Four equivalent voltage meters (VM #) and two equivalent current meters (CM #) are required. The current
meters must be able to measure 2-A current.
2.2.5
Computer
A computer with at least one USB port and a USB cable is required. The bq24261M evaluation software
must be properly installed.
2.2.6
HPA172 Communication Kit (USB TO GPIO)
An HPA172 USB-to-I
2
C communication kit is required.
2.2.7
Software
Download
Battery Management Studio.zip
from the charger's product folder, unzip the file, and double-
click on the SETUP.EXE file. Follow the installation steps.
Because the bq24261M has the watchdog timers 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.
It is recommended that the user periodically click the
READ
button to find the IC's instantaneous status.
Alternatively, the
AutoRead
function can be activated to periodically update the GUI with the IC's status.
7
SLUUBB5A – April 2015 – Revised October 2015
User's Guide for WCSP-Packaged bq24261M 3-A Battery Charger
Evaluation Module
Copyright © 2015, Texas Instruments Incorporated