The BQ25895RTWR is a battery Management IC (integrated circuit) from Texas Instruments, primarily designed for managing battery charging and Power conversion. It supports charging protocols such as Li-Ion and Li-Polymer battery management, while also providing features like power-path management and USB charging.
Package Information
Package Type: WQFN (Quad Flat No-lead) package Pin Count: 28 pins Package Size: 5mm x 5mmDetai LED Pinout and Function List
Below is the full pin function specification for the BQ25895RTWR:
Pin Number Pin Name Pin Function Description 1 VSTOR Input voltage for power storage (typically from an adapter or USB) 2 ACN Negative connection for adapter power input (used for AC detection) 3 ACP Positive connection for adapter power input (used for AC detection) 4 SYS System output voltage for powering the device and connected peripherals 5 NTC Connection for negative temperature coefficient thermistor for battery temperature sensing 6 TS Battery temperature sensing input 7 I2C_SCL Serial clock line for I2C communication (clock signal) 8 I2C_SDA Serial data line for I2C communication (data signal) 9 PGND Ground for Power Management circuit 10 BGND Ground for the battery management circuit 11 CHG Charge enable pin for controlling charge functionality 12 BAT Battery voltage input pin (from battery pack) 13 STAT1 Charge status indicator ( LED driver for charging status) 14 STAT2 Additional charge status indicator (LED driver for additional status) 15 EN Enable control pin for enabling or disabling various functions 16 FAULT Fault indicator pin for indicating fault conditions (such as overvoltage, undervoltage) 17 PG Power Good pin indicating when the system voltage is within an acceptable range 18 INH Input inhibit pin, disables input power under certain conditions 19 VDDIO Voltage for I/O circuits, separate from the main power supply 20 MPPSEP Maximum Power Point tracking separate input for power optimization 21 ISET Current set pin, used for configuring charging current limits 22 VBUS Input voltage from USB port, used to detect USB charging source 23 VREF Voltage reference output pin used for voltage regulation 24 PRECHG Pre-charge pin for slow charge mode (low current charging) 25 CHGOUT Charge output pin (voltage to charge the battery) 26 FETB FET control pin for power-path switching circuit 27 AUX Auxiliary pin used for auxiliary sensing or additional functionality 28 DPM Dynamic Power Management pin, helps optimize power distribution20 Frequently Asked Questions (FAQ) about BQ25895RTWR
Q: What is the function of pin VSTOR on the BQ25895RTWR? A: Pin VSTOR is the input voltage pin for the power storage, typically receiving power from an adapter or USB input.
Q: What is the significance of the TS pin on the BQ25895RTWR? A: The TS pin is used for battery temperature sensing, providing input for thermal protection of the battery.
Q: Can I use the I2CSCL and I2CSDA pins for communication with a microcontroller? A: Yes, I2CSCL (serial clock line) and I2CSDA (serial data line) are used for I2C communication with a microcontroller or external devices.
Q: How does the BQ25895RTWR handle battery charging? A: The BQ25895RTWR manages battery charging through the CHG, BAT, and related pins, providing regulation for safe charging.
Q: What is the purpose of the STAT1 and STAT2 pins? A: STAT1 and STAT2 are status pins used to drive LEDs, indicating the charging status (e.g., charging, full, fault).
Q: Can I use the BAT pin for connecting a battery directly? A: Yes, the BAT pin is designed for connecting the battery pack and serves as the input voltage from the battery.
Q: How does the FAULT pin behave in fault conditions? A: The FAULT pin indicates a fault condition when there is an overvoltage, undervoltage, overcurrent, or other abnormal conditions.
Q: What is the role of the PG pin on the BQ25895RTWR? A: The PG (Power Good) pin indicates when the system voltage is within an acceptable range, signaling that the device is operating normally.
Q: How does the BQ25895RTWR handle power-path management? A: The BQ25895RTWR uses power-path management to dynamically switch between the input power (e.g., USB) and the battery based on power availability and system requirements.
Q: What is the voltage range for the VBUS pin? A: The VBUS pin typically operates in the USB voltage range, which is 5V.
Q: Can I use the VDDIO pin to power external peripherals? A: Yes, the VDDIO pin is used to supply voltage to external peripherals and I/O circuits at a regulated voltage level.
Q: What is the function of the EN pin? A: The EN pin is used to enable or disable various device functions, such as charging or power conversion features.
Q: Can I monitor the charging current through the ISET pin? A: Yes, the ISET pin allows you to set the charging current limits by configuring an external resistor.
Q: Is the BQ25895RTWR compatible with both lithium-ion and lithium-polymer batteries? A: Yes, the BQ25895RTWR is designed to work with both lithium-ion and lithium-polymer batteries.
Q: What happens if the input power is insufficient for charging the battery? A: If the input power is insufficient, the device may enter a low power mode or stop charging to protect the system and battery.
Q: What is the maximum current the BQ25895RTWR can provide for charging? A: The maximum charging current depends on the configuration, but the device can typically provide up to 5A for charging applications.
Q: How do I use the MPPSEP pin in the BQ25895RTWR? A: The MPPSEP pin is used for maximum power point tracking, optimizing the input power for efficient charging.
Q: Can the BQ25895RTWR operate without an external thermistor? A: No, the device requires a thermistor connected to the NTC pin for temperature sensing to ensure safe charging.
Q: How is the battery protection handled by the BQ25895RTWR? A: Battery protection is managed by monitoring the battery voltage, temperature, and current. If a fault condition is detected, the device will disable charging.
Q: How can I monitor the charge status using the BQ25895RTWR? A: The STAT1 and STAT2 pins allow you to monitor the charge status through LEDs, providing visual feedback of the charging state.
I hope this comprehensive pinout and FAQ list is helpful! If you need further clarification or more details on any specific aspect of the BQ25895RTWR, feel free to ask!
