The bq76PL455A-Q1 device is an integrated 16-cell battery monitoring and protection device for high reliability automotive applications. The integrated high-speed differential capacitive isolated communication interface allows 16 bq76PL455A-Q1 devices to communicate with the host through a single high-speed universal asynchronous receiver/transmitter (UART) interface.
The bq76PL455A-Q1 monitors and detects several different fault conditions, including: overvoltage, undervoltage, overtemperature, and communication faults. It also includes six GPIP ports and eight analog AUX ADC inputs for enhanced monitoring and programmable functions. It also has a secondary thermal shutdown feature that provides further protection.
Main features of bq76PL455A-Q1
High-precision monitoring of 6~16 cells can be monitored and balanced for each device;
With internal benchmarks;
High performance 14-bit analog-to-digital converter (ADC);
All battery conversions are completed within 2.4ms (rated value);
8 AUX inputs for temperature and other sensors, input voltage is 0~5V;
Internal precision reference;
Integrated protector with independent Vref for overvoltage (OV) and undervoltage (UV) comparators with programmable VCELL setpoints;
Used to achieve high system robustness;
Stackable isolated differential UART up to 1-Mb/s;
Up to 16 ICs in a daisy chain with twisted pairs;
Passed the high current injection (BCI) test;
Used to achieve robust hot plug performance;
Passive equalization with external n-FETs, active equalization with EMB1428Q/EMB1499Q;
Help users meet functional safety standards (eg ISO26262);
Built-in self-test to verify specified internal functions;
Support Open Wire DetecTIon;
Passed the AEC-Q100 certification:
Device temperature class 2: –40°C~105°C ambient operating temperature range;
Device HBM ESD class classification 2;
Device CDM ESD rating classification C3;
Texas Instruments' passive equalization bq76PL455A-Q1 monitors and equalizes 16 series lithium-ion batteries. The bq76PL455A-Q1 is powered by a 16V (min) to 79.2V (max) battery pack. In addition to the 16 battery measurement channels, there are eight additional analog channels for temperature or auxiliary signal sensing, providing six digital channels. These digital channels can be configured to generate a fault when the level state changes from high to low or low to high. Understand the accuracy of channel voltage measurement in the operating temperature range of 0~65°C and -40°C~105°C. The passive battery equalization current is set by the on-board resistance. At 4.2V, the current per cell is 56mA.
To stack more than 16 cells, you can connect up to 6 bq76PL455EVM to support 96 cells. Communication with the stacked bq76PL455EVM is accomplished with an isolated daisy-chain differential bus capable of withstanding 500V. The bq76PL455EVM stack can wake up from power down mode with a single wake-up command from the GUI. The simulated LED fault indicator monitors the system for failure and displays it in the GUI.
Use a PC GUI to control a single EVM or multiple stacked bq76PL455EVMs. Communication between the PC and the lowest layer of the bq76PL455EVM stack is via the FTDI USB-TTL (5V) serial interface cable. Communication between all other EVMs in the stack is done via an isolated daisy-chain differential communication bus. The PC GUI allows us to configure the bq76PL455EVM to monitor battery and other analog data channels, control equalization and monitor details of any faults.
The bq76PL455EVM demonstrates the performance of Texas Instruments' new highly integrated bq76PL455A-Q1 16-cell battery stack monitoring and passive equalization device. The bq76PL455AQ1 provides a highly accurate, reliable and stable solution for battery management with the following components:
14-bit analog-to-digital converter (ADC);
Precision voltage reference;
Precision high voltage analog front end (AFE);
Universal Asynchronous Receiver/Transmitter (UART) serial communication interface;
LDO regulator
Control logic for monitoring, equalization, and communication functions
Main features of the bq76PL455EVM evaluation module
16 channel precision voltage battery monitoring and passive equalization;
8-channel temperature or auxiliary signal monitoring;
6-channel digital signal monitoring and optional fault monitoring;
Isolated serial communication;
Stackable and supports 96 batteries;
Electrical characteristics of the bq76PL455EVM evaluation module
Operating voltage range: 16V~79.2V;
It can measure up to 16 batteries, the voltage range is 1V~5V, and the absolute maximum battery open circuit voltage: 5.5V;
Equilibrium current: up to [email protected];
Working temperature: -40 ° C ~ 105 ° C;
The bq76PL455EVM implements the following features
Battery voltage monitoring;
Battery UV and OV comparators;
Battery balance;
Temperature and auxiliary signal monitoring;
Embedded control
Fault monitoring
Isolated differential daisy chain communication;
PC serial communication;
General purpose I/O;
power supply;
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