STW4102IQT STMicroelectronics, STW4102IQT Datasheet - Page 20

• Manufacturer Part Number: STW4102IQT
• Description: IC LI-ION BATT CHRGR DUAL 24QFN
• Manufacturer: STMicroelectronics

Specifications of STW4102IQT

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4.25 V ~ 16 V
• Operating Temperature: -30°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Product: Charge Management
• Output Voltage: 4.7 V
• Output Current: 100 mA to 1000 mA
• Operating Supply Voltage: 4.25 V to 16 V
• Supply Current: 2 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• For Use With: 497-8514 - BOARD EVAL STW4102/STM32497-8338 - BOARD EVAL BASED ON STW4102
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6840-2

Battery charger
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Watchdog timer
When the fast charge is active, a watchdog timer starts to prevent damage on the battery.
The system controller refreshes the watchdog periodically in order let the charge continue.
When the watchdog time elapses, the charge is stopped.
When the charge starts in trickle mode, to allow the battery to be charged although the
system controller is not running, the watchdog is disabled. However, if for any reason the
charger goes from fast charge mode to trickle mode, then the watchdog is not disabled to
protect against battery failure.
Watchdog timing can be 1 minute, 15 minutes, 30 minutes or 60 minutes. It is programmable
through the I
or by unplugging the charger (PWRDETECTN goes to low). The watchdog can also be
enabled and disabled through the I
In the standard configuration, the default state at powerup is watchdog enabled and the
timing is one minute.
Thermal regulation
A thermal regulation circuit limits the charge current in case of high power dissipation due to
high input voltage or high ambient temperature. The charge current is progressively reduced
to maintain the die temperature in a safe area. This allows to charge the battery with the
highest possible current depending on the operating conditions, and protects the device
against any damage.
2
C interface. The watchdog can be reset by the I
2
C interface.
2
C interface (bit WDOG_RST)
STw4102