Datasheet

REGOutput
REGOutput
WDIInput
XALERT
FETControl
AccessbyHost
CHG,DSG,and
ZVCHG=OFF
t (500ms)
DWTINIT
t (500ms)
DWTINIT
t
RST
WDRST=L
t
WDWT
NormalOperation
REGOutput
REGOutput
WDIInput
XALERT
FETControl
AccessbyHost
t (500ms)
DWTINIT
t (500ms)
DWTINIT
t
WDWT
NormalOperation
t
RST
t
RST
t
RST
CHG,DSG,and
ZVCHG=OFF
WDRST=H
bq29330
SLUS673E –SEPTEMBER 2005–REVISED MARCH 2012 www.ti.com
Figure 4. Watchdog Timing Chart – WDI Fault After Startup
DSG and CHG NCH FET DRIVER CONTROL
The bq29330 drives either the DSG or CHG FET off if an OL, SCC, or SCD safety threshold is breached
depending on the current direction. The host can force any FET on or off only if the bq29330 integrated
protection control allows.
The default-state of the FET drive is off. A host can control the FET drive by programming OUTPUT_CONTROL
(b2...b0), where b0 is used to control the discharge FET, b1 is used to control the charge FET, and b2 is used to
control the ZVCHG FET. These controls are only valid when not in the initialized state. The CHG drive FET can
be powered by PACK and the DSG FET can be powered by BAT.
When the bq29330 powers down, the NCH FET drivers power down to GND causing the FETs to turn off.
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Product Folder Link(s): bq29330