BQ25872 Datasheet, PDF (22/68 Pages) Texas Instruments – Battery Switch Charger

bq25872
SLUSCQ6 – OCTOBER 2016
www.ti.com
Feature Description (continued)
If OCP_RES = ‘1’ (hiccup mode), the device will turn off the battery switch within t_{IBUS_OCP} and will attempt to turn
on the battery switch every t_{IBUS_OCP_HP}, up to seven times before latching off the battery switch. Upon latching
off after the seventh try, IBUS_OCP_FLT is set to ‘1’. Once the battery switch is latched off, CHG_EN is set to ‘0’
and host intervention is required to set CHG_EN to ‘1’ to enable the battery switch again.
Hiccup count = 1 Hiccup count = 2
Hiccup count = 1
I_SCP
IBUS_OCP
Hiccup count resets
IBUS
t_{IBUS_OCP}
VOUT
t_{IBUS_OCP_HP}
t_{OFF_FET}
t_{IBUS_OCP}
t_{IBUS_HP_RST}
t_{IBUS_OCP}
t_{OFF_FET}
t_{OFF_FET}
Figure 12. IBUS OCP in Hiccup Mode
VBUS over-voltage protection (VBUS_OVP) monitors the voltage on VBUS. VBUS_OVP protection is always
active when the device voltage is above at least one PRESENT level (VBUS or VOUT), and the protection has a
selectable deglitch time set by VBUS_OVP_DLY. When VBUS_OVP threshold is reached, the battery switch is
turned off in t_{VBUS_OVP} and latched off. If the VBUS_OVP or IBUS_OCP value written to the register is greater
than the max defined value for the register, then the corresponding register will be set to the highest defined
value.
If a threshold has been crossed (IBUS_OCP or VBUS_OVP), the appropriate bit in the EVENT_1 register is
updated (set to ‘1’ if threshold is crossed, ‘0’ if threshold is not crossed). If the EVENT_1_MASK bit is not set to
‘1’ for the corresponding bit in the EVENT_1 register, then INT will assert low to alert the host of a fault.
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