BQ7694003DBTR Detailed explanation of pin function specifications and circuit principle instructions
The "BQ7694003DBTR" is a part from Texas Instruments (TI). It is a highly integrated Battery Management System (BMS) IC used primarily for battery protection in multi-cell lithium-ion and lithium-polymer battery packs. This IC monitors and protects the battery pack by performing functions such as over-voltage, under-voltage, over-current, and over-temperature protection.
Here’s a detailed explanation and specification for the BQ7694003DBTR, focusing on the package, pin functions, circuit principles, and related frequently asked questions.
Package Type and Pinout
The BQ7694003DBTR is available in a 48-pin TSSOP (Thin Shrink Small Outline Package). Here’s a breakdown of the pinout and function for each pin. Since the number of pins is 48, every pin is documented.
Pin Function List for BQ7694003DBTR (48 Pins)
Pin Number Pin Name Pin Function Description 1 VSTOR Power supply pin for the device. This pin connects to the battery pack voltage. 2 VSS Ground pin for the system. 3 V1P Positive voltage input for the first cell (Cell 1). 4 V1N Negative voltage input for the first cell (Cell 1). 5 V2P Positive voltage input for the second cell (Cell 2). 6 V2N Negative voltage input for the second cell (Cell 2). 7 V3P Positive voltage input for the third cell (Cell 3). 8 V3N Negative voltage input for the third cell (Cell 3). 9 V4P Positive voltage input for the fourth cell (Cell 4). 10 V4N Negative voltage input for the fourth cell (Cell 4). 11 V5P Positive voltage input for the fifth cell (Cell 5). 12 V5N Negative voltage input for the fifth cell (Cell 5). 13 V6P Positive voltage input for the sixth cell (Cell 6). 14 V6N Negative voltage input for the sixth cell (Cell 6). 15 V7P Positive voltage input for the seventh cell (Cell 7). 16 V7N Negative voltage input for the seventh cell (Cell 7). 17 V8P Positive voltage input for the eighth cell (Cell 8). 18 V8N Negative voltage input for the eighth cell (Cell 8). 19 PGOOD Power Good indicator output. High when the power supply is stable and within the required range. 20 TS1 Temperature sensor input for the first sensor. 21 TS2 Temperature sensor input for the second sensor. 22 TS3 Temperature sensor input for the third sensor. 23 ILIM Current limit input for the system's over-current protection. 24 DOUT Data output pin for Communication (usually used for digital communication like SPI). 25 DIN Data input pin for communication. 26 SCLK Serial clock pin for communication (e.g., SPI clock line). 27 CS Chip Select pin for SPI communication. 28 FET_GATE1 Gate drive for the first external FET (for high side switching). 29 FET_GATE2 Gate drive for the second external FET (for low side switching). 30 FET_GATE3 Gate drive for the third external FET (for second high side switching). 31 FET_GATE4 Gate drive for the fourth external FET (for second low side switching). 32 ALERT Alert output pin to signal any abnormal conditions in the system. 33 RESET Reset input pin for restarting the system. 34 REG_5V Internal 5V regulator output. 35 NC No connection. 36 NC No connection. 37 NC No connection. 38 NC No connection. 39 NC No connection. 40 NC No connection. 41 NC No connection. 42 NC No connection. 43 NC No connection. 44 NC No connection. 45 NC No connection. 46 NC No connection. 47 NC No connection. 48 NC No connection.Circuit Principles
The BQ7694003DBTR uses a multi-cell battery monitoring system. It integrates the following features:
Voltage Measurement: Each of the cell voltages (up to 15 cells) is measured using high-precision ADCs. The pins V1P, V1N, etc., correspond to these measurements. Overvoltage and Undervoltage Protection: The device monitors the voltage levels for each cell to ensure safe operation. Current Sensing: The ILIM pin helps in setting the current limit for the battery pack, helping prevent excessive current draw or charging. Temperature Sensing: External temperature sensors are connected to the TS pins to protect the cells from high-temperature conditions. Cell Balancing: The IC allows balancing of each cell to ensure they are charged to the same voltage level. Communication: The device uses an SPI interface (SCLK, CS, DIN, DOUT) for communication with a microcontroller or host system. FET Control: The FET_GATE pins control external MOSFETs for cell isolation or current cut-off when protection is triggered. Fault Detection and Alerts: The ALERT pin is used to signal when a fault is detected, such as overvoltage, undervoltage, or overcurrent.