The BQ25601RTWR is a battery management IC manufactured by Texas Instruments. It is primarily used for charging and Power management in battery-operated devices, such as smartphones, laptops, and portable equipment.
Packaging Information
The BQ25601RTWR comes in a WQFN-24 (Wettable Flank) package, which has 24 pins.Pin Function Specification and Circuit Principle
Here is the detailed pin function table for the BQ25601RTWR in a WQFN-24 package.
Pin # Pin Name Pin Function Description 1 NTC Negative Temperature Coefficient input for thermistor to monitor battery temperature. 2 TS Thermal sense input to monitor temperature for charging safety. 3 I2C SDA I2C Data input/output (serial data line for communication). 4 I2C SCL I2C Clock input (serial clock line for communication). 5 CHG Charge status output (high indicates charging, low indicates no charging). 6 BATSNS Battery sense input for voltage monitoring (senses the voltage level of the battery). 7 VBAT Battery connection input (directly connected to the battery pack). 8 TS1 External thermistor connection for monitoring battery pack temperature. 9 GND Ground connection for the device. 10 EN Enable pin to activate or deactivate the charging process (active low). 11 PROG External resistor input for programming charge current. 12 VSTOR Storage voltage input, used for an external voltage source (e.g., from a DC adapter). 13 D+/D- USB differential pair for data transfer (D+ and D- are the two data lines in USB communication). 14 IN1 Input voltage pin for external power supply (for charging the battery). 15 IN2 Input voltage pin (second input for additional power supply or for system voltage). 16 ISET External resistor to set current regulation for charge management. 17 VREF Voltage reference output pin for the system or external use. 18 FET Battery charge control FET (helps manage current flow to and from the battery). 19 OTG OTG (On-The-Go) configuration for transferring power between devices. 20 POK Power OK output signal (indicates when external power source is present). 21 VBUS USB input for the VBUS line, typically used for charging the battery from a USB port. 22 OUT Output pin for the regulated battery voltage to supply power to the device. 23 BATTSEL Battery selection pin to choose between different battery packs in multi-cell configurations. 24 CAP Internal capacitor connection for smooth operation and voltage stabilization.Pin Function FAQ for the BQ25601RTWR
Q: What is the purpose of the NTC pin (Pin 1) in the BQ25601RTWR? A: The NTC pin is used for connecting an external thermistor to monitor the battery temperature to ensure safe charging and operation.
Q: How does the TS pin (Pin 2) function? A: The TS pin is used for thermal sense input, and it helps monitor the temperature for charging safety, triggering a thermal shutdown if necessary.
Q: What is the function of the I2C SDA and I2C SCL pins (Pins 3 and 4)? A: These pins are used for I2C communication: SDA is the data line, and SCL is the clock line, allowing communication with external controllers or devices.
Q: What does the CHG pin (Pin 5) indicate? A: The CHG pin is an output that indicates the charging status: a high voltage on this pin shows the battery is charging, and a low voltage indicates no charging.
Q: What is the function of the BATSNS pin (Pin 6)? A: The BATSNS pin is used for battery voltage sensing, allowing the IC to monitor the battery's voltage level to regulate charging.
Q: What does the VBAT pin (Pin 7) connect to? A: The VBAT pin connects directly to the battery pack, allowing the IC to manage the charging and discharging processes.
Q: What is the TS1 pin (Pin 8) used for? A: The TS1 pin connects an external thermistor, allowing the IC to monitor the temperature of the battery pack for safety.
Q: What is the role of the GND pin (Pin 9)? A: The GND pin is the ground connection for the device, providing a reference for all voltages within the circuit.
Q: What does the EN pin (Pin 10) do? A: The EN pin is used to enable or disable the charging process. When it is low, the charging function is disabled.
Q: What is the purpose of the PROG pin (Pin 11)? A: The PROG pin connects to an external resistor to set the charging current, which controls the charging rate for the battery.
Q: What is the VSTOR pin (Pin 12) used for? A: The VSTOR pin is used for an external voltage input, which can be a DC supply used to charge the battery or power the device.
Q: How are the D+ and D- pins (Pin 13) used? A: These pins are used for USB communication, transmitting data between the device and the charger or host system.
Q: What are the IN1 and IN2 pins (Pins 14 and 15) for? A: These pins are used to provide input power from external sources for charging the battery, such as a DC power supply or USB charger.
Q: What is the role of the ISET pin (Pin 16)? A: The ISET pin connects to an external resistor to set the charging current regulation, allowing for precise control over the charging process.
Q: What does the VREF pin (Pin 17) provide? A: The VREF pin provides a stable reference voltage, which can be used for system voltage regulation or other external circuits.
Q: What is the function of the FET pin (Pin 18)? A: The FET pin controls the charge and discharge FETs, managing the current flow to and from the battery during charging.
Q: What is the purpose of the OTG pin (Pin 19)? A: The OTG pin enables the On-The-Go function, allowing the system to either charge or provide power to other devices.
Q: What is the significance of the POK pin (Pin 20)? A: The POK pin indicates when the external power source is valid, signaling that power is present for proper charging.
Q: How does the VBUS pin (Pin 21) work? A: The VBUS pin is used to connect to the USB power line for charging the battery from a USB source.
Q: What is the function of the OUT pin (Pin 22)? A: The OUT pin provides the regulated battery voltage to supply power to the device from the battery.
This explanation provides a comprehensive overview of the BQ25601RTWR's 24 pins with detailed descriptions for each one, as well as answers to common questions. Let me know if you need any further clarification!