Test Setup and Results
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6
SLVUB31A – September 2017 – Revised March 2018
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bq25910EVM-854 Evaluation Module
2.2.2
Setting up the bq25910
This section describes the options available for evaluation of the bq25910 and how to set up the device for
basic evaluation.
•
Once the master charger is set up, select the
bq25910 Field View
tab on bqStudio to continue to set
up the parallel charger.
Figure 4. bq25910 Registers
•
Figure 4
shows the configurable registers, single-bit I2C commands and status registers available for
the bq25910.
•
The bq25910 is a host controlled parallel charger and will automatically shut off when the I2C
watchdog timer is not reset within the timer period (40 seconds by default). While in default mode,
charging is disabled until the host sets the ENABLE CHARGE bit and resets the watchdog timer via
the
WD_RST
bit (RESET WATCHDOG command).
•
After POR, the device is in default mode with the watchdog timer expired. While in default mode, the
bq25910 remains in HIZ mode and will not charge the battery.
•
The
WD_RST
bit needs to be set first to force the charger out of default mode. This can be done by
setting the
RESET WATCHDOG
checkbox on bqStudio, see
Figure 5
for the location of the
WD_RST
bit in the
Single-bit I2C Selection
section of bqStudio.
Figure 5. bq25910 WD_RST bit
•
Once
WD_RST
is set, all the device parameters can be programmed. To keep the device in host
mode, the host has to reset the watchdog timer by setting the
WD_RST
bit before the timer expires or
disable the watchdog timer. For the purpose of this evaluation, we disable the watchdog timer by
writing REG05[5:4] = 00b. This can be done by using the drop-down menu for the
Watchdog Timer
setting on the
Multi-bit I2C Pulldown Menu
. See
Figure 6
for the location in bqStudio.
