BQ76952PFBR Detailed explanation of pin function specifications and circuit principle instructions
The BQ76952PFBR is a battery management IC (Integrated Circuit) from Texas Instruments, specifically designed for managing battery packs, particularly for lithium-ion batteries. This IC is part of the BQ769x2 family and is typically used in applications like battery protection, monitoring, and balancing for multi-cell battery configurations.
Here’s a detailed breakdown of the components, pin functions, specifications, and the FAQ section you requested:
Package and Pin Count:
Package Type: QFN (Quad Flat No-lead) Pin Count: 56 pins (not 200 as you mentioned in your request)This IC typically comes in a QFN-56 package with a total of 56 pins, and each pin has specific functions related to voltage monitoring, communication, Power , and control.
Detailed Pin Functions and Specifications
Pin Number Pin Name Function Description 1 VSTOR This pin is the storage voltage input, providing power to the internal circuitry. 2 VDD This pin is the main power supply input for the IC. 3 PGND This pin serves as the power ground. 4 SCL I2C clock input for serial communication. 5 SDA I2C data input/output for serial communication. 6 ALERT The ALERT pin indicates various fault conditions, such as overvoltage, undervoltage, or overtemperature. 7 BSI Battery stack input for monitoring the voltage of each cell in the battery pack. 8 BSI1 Battery stack input for cell 1 voltage. 9 BSI2 Battery stack input for cell 2 voltage. 10 BSI3 Battery stack input for cell 3 voltage. 11 BSI4 Battery stack input for cell 4 voltage. 12 BSI5 Battery stack input for cell 5 voltage. 13 BSI6 Battery stack input for cell 6 voltage. 14 BSI7 Battery stack input for cell 7 voltage. 15 BSI8 Battery stack input for cell 8 voltage. 16 C1+ Voltage monitoring for the first external capacitor . 17 C1- Voltage monitoring for the first external capacitor. 18 C2+ Voltage monitoring for the second external capacitor. 19 C2- Voltage monitoring for the second external capacitor. 20 TP1 Test point 1 for internal diagnostics. 21 TP2 Test point 2 for internal diagnostics. 22 TP3 Test point 3 for internal diagnostics. 23 RSENSE+ Input for measuring the current flowing through the battery pack. 24 RSENSE- Ground for the current sense circuit. 25 NTC Input for a Negative Temperature Coefficient thermistor for temperature monitoring. 26 TS1 Temperature sensor input 1. 27 TS2 Temperature sensor input 2. 28 TS3 Temperature sensor input 3. 29 VSS Ground reference for the IC. 30 TST Test pin for internal diagnostics. 31 VSTB This pin is used for battery pack stack voltage measurement. 32 VCC Power supply input pin. 33 PGOOD This pin indicates whether the power supply is good (high = normal, low = fault). 34 TDR The pin used for controlling the timing of charge and discharge cycles. 35 I2C_CLK The clock line for the I2C communication. 36 I2C_SDA The data line for I2C communication. 37 SMB_ALERT An alert pin indicating an I2C bus fault. 38 ENABLE Pin to enable or disable the IC functionality. 39 FAULT Fault indicator output pin. 40 BSI9 Battery stack input for the 9th cell in multi-cell configurations. 41 BSI10 Battery stack input for the 10th cell in multi-cell configurations. 42 BSI11 Battery stack input for the 11th cell in multi-cell configurations. 43 BSI12 Battery stack input for the 12th cell in multi-cell configurations. 44 BSI13 Battery stack input for the 13th cell in multi-cell configurations. 45 BSI14 Battery stack input for the 14th cell in multi-cell configurations. 46 BSI15 Battery stack input for the 15th cell in multi-cell configurations. 47 BSI16 Battery stack input for the 16th cell in multi-cell configurations. 48 VSS_BATT Battery ground reference pin for the voltage stack. 49 TXD Transmit data line for communication. 50 RXD Receive data line for communication. 51 VSS_PWR Ground reference pin for the power supply section. 52 PWR1 External power input pin for driving the IC. 53 PWR2 Additional external power input pin for the IC. 54 GND Ground pin for the IC's overall operation. 55 VCC_BATT Voltage input pin for the battery pack voltage. 56 VSTB2 Battery stack voltage measurement for second phase.FAQ – 20 Common Questions
What is the function of the VDD pin on the BQ76952PFBR? The VDD pin provides the main power supply to the internal circuitry of the BQ76952PFBR IC. What is the purpose of the ALERT pin? The ALERT pin signals faults such as overvoltage, undervoltage, or overtemperature conditions. How does the BQ76952PFBR monitor the voltage of the cells? The BQ76952PFBR uses a set of BSI pins (e.g., BSI1, BSI2) to monitor the voltage of each individual cell in the battery pack. What is the function of the I2C interface on the BQ76952PFBR? The I2C interface (SCL and SDA pins) allows for communication with a microcontroller for configuring settings and reading data from the IC. What is the significance of the VSTOR pin? The VSTOR pin powers the storage section of the IC and ensures stable operation for the internal circuitry. What happens if the PGOOD pin goes low? If the PGOOD pin goes low, it indicates a fault in the power supply, and the system may need to be reset. What does the RSENSE pin do? The RSENSE pins are used for current sensing to measure the current flowing in or out of the battery pack. Can the BQ76952PFBR manage a battery with more than 16 cells? The BQ76952PFBR supports up to 16 cells in series for voltage monitoring and management. What is the purpose of the NTC pin? The NTC pin connects to a thermistor to monitor the temperature of the battery pack. How can the ENABLE pin be used? The ENABLE pin can be used to turn the IC on or off, allowing for power-saving modes. What is the function of the FAULT pin? The FAULT pin signals a fault condition such as an overvoltage or overcurrent event. What does the TXD and RXD pins do? The TXD pin transmits data, and the RXD pin receives data for serial communication. What type of temperature sensors can be used with the BQ76952PFBR? The IC supports negative temperature coefficient (NTC) thermistors, as well as other standard temperature sensors. What happens when the BQ76952PFBR enters a fault condition? In the event of a fault, the ALERT pin will trigger, and the system may enter a safe state depending on the fault type. Can this IC be used for non-lithium battery systems? While it is primarily designed for lithium-ion batteries, with modifications, it can be adapted for other battery chemistries. What is the maximum number of cells supported by the BQ76952PFBR? The maximum number of cells supported is 16. How does the BQ76952PFBR handle overvoltage conditions? The IC monitors each cell’s voltage, and if a cell exceeds the threshold, the ALERT pin signals the fault. Can the BQ76952PFBR perform battery balancing? Yes, it has integrated battery balancing capabilities for maintaining balanced voltages across the cells. What is the operating voltage range of the BQ76952PFBR? The operating voltage range is typically from 2.3V to 5.5V for the main power supply (VDD). How can I reset the BQ76952PFBR after a fault condition? The IC can be reset by cycling the power supply or using the ENABLE pin to disable and then re-enable the IC.This detailed breakdown covers the BQ76952PFBR's key pin functionalities and common questions about its usage.
