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BQ21062 データシート(PDF) 23 Page - Texas Instruments

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部品番号 BQ21062
部品情報  BQ21062 I2C Controlled 1-Cell 500-mA Linear Battery Charger with Power Path, Load Switch, 10-nA Ship Mode, and Regulated System (PMID) Voltage
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

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9.3.8 14-Second Watchdog for HW Reset
The BQ21062 integrates a 14-second watchdog timer that makes the BQ21062 perform a HW reset/power cycle
if no I2C transaction is detected within 14 seconds of a valid adapter being connected. If the adapter is
connected and the host responds with an I2C transaction before the 14-second watchdog window expires, the
part continues in normal operation. The 14-second watchdog is disabled by default and may be enabled through
I2C by setting the HWRESET_14S_WD bit. Figure 9-7 shows the basic functionality of this feature.
R/W
VIN
SHIPMODE
VDD
I2C
HWRESET_14S_WD
PMID
14s
14s
R/W
14s
R/W
HW Reset due to no I2C
transaction after VIN
detected
No HW Reset since
function was not re-
enabled after boot up
No HW Reset since I2C
transaction occurred
within 14s window of
VIN detection
Figure 9-7. 14-Second Watchdog for HW Reset Behavior
9.3.9 Faults Conditions and Interrupts ( INT)
The device contains an open-drain output that signals an interrupt and is valid only after the device has
completed start-up into a valid state. If the part starts into a fault, interrupts will not be sent. The INT pin is
normally in high impedance and is pulled low for 128 µs when an interrupt condition occurs. When a fault or
status change occurs or any other condition that generates an interrupt such as CHARGE_DONE, a 128-µs
pulse (interrupt) is sent on INT to notify the host. All interrupts may be masked through I2C. If the interrupt
condition occurs while the interrupt is masked an interrupt pulse will not be sent. If the interrupt is unmasked
while the fault condition is still present, an interrupt pulse will not be sent until the INT trigger condition occurs
while unmasked.
9.3.9.1 Flags and Fault Condition Response
Table 9-3 below details the BQ21062 behavior when a fault condition occurs.
Table 9-3. Interrupt Triggers and Fault Condition Response
FAULT / FLAG
DESCRIPTION
INTERRUPT
TRIGGER
BASED ON
STATUS BIT
CHANGE
CHARGER
BEHAVIOR
CHARGER SAFETY
TIMER
PMID BEHAVIOR
CHRG_CV_FLAG
Set when charger
enters Constant
Voltage operation
Rising Edge
Enabled
No effect
IN powered if VIN is
valid
CHARGE_DONE_FLA
G
Set when charger
reaches termination
Rising Edge
Paused- Charging
resumes with VIN or
CE toggle or when
VRCH is reached
Reset
IN powered if VIN is
valid
IINLIM_ACTIVE_FLAG
Set when Input Current
Limit loop is active
Rising Edge
Enabled. Reduced
charge current.
Doubled if option is
enabled
IN powered VIN
powered unless
supplement mode
condition is met.
VINDPM_ACTIVE_FL
AG
Set when VINDPM
loop is active
Rising Edge
Enabled. Reduced
charge current.
Doubled if option is
enabled
VIN powered unless
supplement mode
condition is met.
THERMREG_ACTIVE
Set when Thermal
Charge Current
Foldback (Thermal
Regulation) loop is
active
Rising Edge
Enabled. Reduced
charge current.
Doubled if option is
enabled
VIN powered unless
supplement mode
condition is met.
www.ti.com
BQ21062
SLUSE42 – JULY 2020
Copyright © 2020 Texas Instruments Incorporated
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