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Recently, Austrian Microelectronics announced the introduction of a smart battery sensor reference design for automobiles. The intelligent battery sensor (IBS) design is suitable for monitoring the state of charge (SOC) of the latest lithium iron phosphate automobile batteries and traditional AGM (lead acid) batteries. And battery safety status (SOH). The measurement front end of IBS uses AS8515, which can accurately and real-time measure the current and voltage of the battery and the temperature of the circuit board, and output these data as electronic signals. The measurement data is processed by Fujitsu's ARM Cortex-M3 microcontroller to bring accurate readings to any type of 12V battery.
The reference design with complete documentation and as part of the development kit is now available and can be put into production at any time, and may be selected by automobile manufacturers as a ready-made template for the IBS system. Unlike the fixed architecture integrated system provided by competitors, the reference design of Austrian Microelectronics allows users to choose the microcontroller freely. The software provided by the Austrian Microelectronics IBS reference design demonstrates how to use the Coulomb counting method for SOC calculation and how to calculate the resulting battery impedance when the current load changes exceed 5A. The software can be easily output to any developer-selected microcontroller, including other ARM Cortex-M series devices.
According to reports, AS8515 contains an integrated LIN transceiver and an IBS sensor module that can be used as a LIN slave device in automotive systems. The reference design includes an independent LIN motherboard containing a LIN controller and a USB controller, allowing developers to control and configure the sensor module through the graphical user interface of Austrian Microelectronics (computer for Windows operating system). The IBS module combines Austrian Microelectronics ’expertise in high-precision and high-sensitivity analog circuits, enabling extremely accurate battery measurement: the current measurement accuracy error is ± 0.5% (standard case) in the entire signal range; at -40 Within the temperature range of ° C ~ 115 ° C, the voltage measurement accuracy error is less than ± 0.1% (standard case). The linear deviation is less than 0.01%.
In addition, the high-efficiency ARM Cortex-M3 core in the Fujitsu MB9B520K microcontroller equipped with the sensor helps to greatly reduce energy consumption. Under normal operating conditions, the entire sensor module consumes only 8mA, and only 87μA in standby mode in current monitoring mode.
Bernd Gessner, vice president and general manager of the automotive business unit of Austrian Microelectronics, said: "Competitive IBS systems provide car manufacturers with fixed architecture systems, forcing them to use only outdated microcontrollers integrated in system packages. Austrian Microelectronics The solution is more advantageous because we separate the sensor from the microcontroller, allowing developers to use the latest microcontroller in their IBS design while using Austria Microelectronics' proven measurement front end.
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