BQ24190_15 Datasheet, PDF (27/52 Pages) Texas Instruments – bq2419x I2C Controlled 4.5-A Single Cell USB/Adapter Charger with Narrow VDC Power Path Management and USB OTG

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bq24190, bq24192, bq24192I
SLUSAW5B – JANUARY 2012 – REVISED DECEMBER 2014
1
7
1
1
S Slave Address 0 ACK
8
Reg Addr
1
1
7
1
1
ACK S Slave Address 1 ACK
8
Data @ Addr
1
ACK
8
Data @ Addr+1
1
ACK
8
1
1
Data @ Addr+1 ACK P
Figure 24. Multi-Read
The fault register REG09 locks the previous fault and only clears it after the register is read. For example, if
Charge Safety Timer Expiration fault occurs but recovers later, the fault register REG09 reports the fault when it
is read the first time, but returns to normal when it is read the second time. To verify real time fault, the fault
register REG09 should be read twice to get the real condition. In addition, the fault register REG09 does not
support multi-read or multi-write.
9.4 Device Functional Modes
9.4.1 Host Mode and Default Mode
The bq24190, bq24192, bq24192I is a host controlled device, but it can operate in default mode without host
management. In default mode, bq24190, bq24192, bq24192I can be used as an autonomous charger with no
host or with host in sleep.
When the charger is in default mode, REG09[7] is HIGH. When the charger is in host mode, REG09[7] is LOW.
After power-on-reset, the device starts in watchdog timer expiration state, or default mode. All the registers are in
the default settings.
Any write command to bq24190, bq24192, bq24192I transitions the device from default mode to host mode. All
the device parameters can be programmed by the host. To keep the device in host mode, the host has to reset
the watchdog timer by writing 1 twice to REG01[6] before the watchdog timer expires (REG05[5:4]), or disable
watchdog timer by setting REG05[5:4] = 00.
POR
watchdog timer expired
Reset registers
I2C interface enabled
Y
I2C Write?
N
Default Mode
Reset watchdog timer
Reset registers
Host Mode
Start watchdog timer
Host programs registers
Reset REG01
Y
bit[6]?
N
Y
N
I2C Write?
Y
Watchdog Timer
N
Expired?
Figure 25. Watchdog Timer Flow Chart
9.4.1.1 Plug in USB100mA Source with Good Battery
When the input source is detected as 100-mA USB host, and the battery voltage is above batgood threshold
(V_BATGD), the charger device enters HIZ state to meet the battery charging spec requirement.
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