BQ24190_15 Datasheet, PDF (22/52 Pages) Texas Instruments – bq2419x I2C Controlled 4.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

bq24190, bq24192, bq24192I
SLUSAW5B – JANUARY 2012 – REVISED DECEMBER 2014
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• Toggle the CE pin HIGH to LOW to HIGH (charge enable)
• Write REG01[5:4] from 00 to 01 (charge enable)
• Write REG05[3] from 0 to 1 (safety timer enable)
During input voltage/current regulation or thermal regulation, or when FORCE_20PCT (REG02[0]) bit is set, the
safety timer counts at half clock rate since the actual charge current is likely to be below the register setting. For
example, if the charger is in input current regulation (IINDPM) throughout the whole charging cycle, and the
safety time is set to 5 hours, the safety timer will expire in 10 hours. This feature can be disabled by writing 0 to
REG07[6].
It is recommended to disable safety timer first by clearing REG05[3] bit before safety timer configuration is
changed. The safety timer should be re-enabled by setting REG05[3] bit.
9.3.3.7 USB Timer when Charging from USB100mA Source
The total charging time in default mode from USB100-mA source is limited by a 45-min max timer. At the end of
the timer, the device stops the converter and goes to HIZ.
9.3.4 Status Outputs (PG, STAT, and INT)
9.3.4.1 Power Good Indicator (PG)
In bq24192, bq24192I, PG goes LOW to indicate a good input source when:
1. VBUS above UVLO
2. VBUS above battery (not in sleep)
3. VBUS below ACOV threshold
4. VBUS above 3.8 V when 30-mA current is applied (not a poor source)
9.3.4.2 Charging Status Indicator (STAT)
The bq24190, bq24192, bq24192I indicates charging state on the open drain STAT pin. The STAT pin can drive
LED as the application diagram shows.
Table 6. STAT Pin State
CHARGING STATE
Charging in progress (including recharge)
Charging complete
Sleep mode, charge disable
Charge suspend (Input over-voltage, TS fault, timer fault, input or system over-
voltage)
STAT
LOW
HIGH
HIGH
blinking at 1Hz (bq24190, bq24192)
or 10-kΩ pull down (bq24192I)
When a fault occurs, instead of blinking, the STAT pin in bq24192I has a 10-kΩ pull-down resistor to ground.
When the pull-up resistor is 30 kΩ, the STAT voltage during fault is 1/4 of the pull-up rail.
9.3.4.3 Interrupt to Host (INT)
In some applications, the host does not always monitor the charger operation. The INT notifies the system on the
device operation. The following events will generate 256-us INT pulse.
• USB/adapter source identified (through PSEL or DPDM detection, with OTG pin)
• Good input source detected
– V_VBUS - V_BAT > V_SLEEPZ
– V_VBUS > V_ACOV
– current limit above I_BADSRC
• Input removed
• Charge Complete
• Any FAULT event in REG09
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