BQ25601 Datasheet, PDF (29/60 Pages) Texas Instruments – I2C Controlled 3-A, Single-Cell Battery Charger for High Input Voltage and Narrow Voltage DC (NVDC) Power Path Management

bq25601
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SLUSCK5 – MARCH 2017
Additionally, the device has thermal shutdown to turn off the converter and BATFET when IC surface
temperature exceeds T_SHUT(160ºC). The fault register CHRG_FAULT is set to 1 and an INT is asserted to the
host. The BATFET and converter is enabled to recover when IC temperature is T_{SHUT_HYS} (30ºC) below
T_SHUT(160ºC).
8.4.10.3.2 Thermal Protection in Boost Mode
The device monitors the internal junction temperature to provide thermal shutdown during boost mode. When IC
surface temperature exceeds T_SHUT (160ºC), the boost mode is disabled (converter is turned off) by setting
OTG_CONFIG bit low and BATFET is turned off. When IC surface temperature is below T_SHUT(160ºC) -
T_{SHUT_HYS} (30ºC), the BATFET is enabled automatically to allow system to restore and the host can re-enable
OTG_CONFIG bit to recover.
8.4.10.4 Battery Protection
8.4.10.4.1 Battery overvoltage Protection (BATOVP)
The battery overvoltage limit is clamped at 4% above the battery regulation voltage. When battery over voltage
occurs, the charger device immediately disables charge. The fault register BAT_FAULT bit goes high and an INT
is asserted to the host.
8.4.10.4.2 Battery Over-Discharge Protection
When battery is discharged below V_{BAT_DPL_FALL}, the BATFET is turned off to protect battery from over discharge.
To recover from over-discharge, an input source is required at VBUS. When an input source is plugged in, the
BATFET turns on. The battery is charged with I_SHORT (typically 100 mA) current when the VBAT < VSHORT, or
precharge current as set in IPRECHG register when the battery voltage is between V_SHORTZ and V_{BAT_LOWV}.
8.4.10.4.3 System Over-Current Protection
When the system is shorted or significantly overloaded (IBAT > IBATOP) so that its current exceeds the
overcurrent limit, the device latches off BATFET. Section BATFET Enable (Exit Shipping Mode) can reset the
latch-off condition and turn on BATFET.
8.4.11 Serial interface
The device uses I²C compatible interface for flexible charging parameter programming and instantaneous device
status reporting. I²CTM is a bi-directional 2-wire serial interface developed by Philips Semiconductor (now NXP
Semiconductors). Only two bus lines are required: a serial data line (SDA) and a serial clock line (SCL). Devices
can be considered as masters or slaves when performing data transfers. A master is the device which initiates a
data transfer on the bus and generates the clock signals to permit that transfer. At that time, any device
addressed is considered a slave.
The device operates as a slave device with address 6BH, receiving control inputs from the master device like
micro controller or a digital signal processor through REG00-REG0B. Register read beyond REG0B (0x0B)
returns 0xFF. The I²C interface supports both standard mode (up to 100kbits), and fast mode (up to 400kbits).
connecting to the positive supply voltage via a current source or pull-up resistor. When the bus is free, both lines
are HIGH. The SDA and SCL pins are open drain.
8.4.11.1 Data Validity
The data on the SDA line must be stable during the HIGH period of the clock. The HIGH or LOW state of the
data line can only change when the clock signal on the SCL line is LOW. One clock pulse is generated for each
data bit transferred.
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