Toshiba Electronics developed a Li-ion battery monitor chipset for automotive applications. Designed for Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs), the Li-ion battery monitoring chipset comprises the TB9141FG battery monitoring IC and the TMPM358FDTFG microcontroller. The chipset detects remaining battery level, equalizes battery levels (cell balancing) and can detect abnormal battery status.

Toshiba_Automotive_ElectronicsThe TB9141FG is industry’s first battery monitoring IC that monitors up to 16 cells, which can lead to component count reduction in a battery monitoring system. Furthermore, the TB9141FG is able to communicate in a noisy environment by differential signals using daisy chain communication with neighbouring TB9141FGs.

The TMPM358FDTFG is a 32-bit RISC microcontroller built around an ARM Cortex-M3 core and compliant with functional safety levels (IEC61508 / ISO26262).

TB9141FG Battery Monitoring IC Key Features

  • Monitors up to 16 cells – The TB9141FG uses a 96V process and realizes 16-cell li-ion battery monitoring with a single IC. As a result, the TB9141FG contributes to the development of battery monitoring systems with fewer parts and at lower cost.
  • Noise-tolerant communication using differential daisy chain configuration – The TB9141FG uses differential signal communication in a daisy chain topology ensuring stable communications with other TB9141FG devices, even in a noisy environment. This is an important issue for battery monitoring in automotive applications.
  • ±2mV (typ.) cell voltage measurement accuracy – The TB9141FG realizes typical ±2mV cell voltage measurement accuracy, improving the accuracy of battery state of charge (SOC) detection and contributing to more effective battery usage.
  • Battery voltage measurement available while cell balancing – The TB9141FG incorporates a cell balance switch and is able to measure battery voltage while cell balancing.
  • Integrated self-test functions – The TB9141FG incorporates many self-test functions for use in ISO26262-compliant systems.

TMPM358FDTFG Microcontroller Key Features

  • Backup function operates during Cortex-M3 core power down – The TMPM358FDTFG incorporates backup power for 16-bit pre scalar counter and 32-bit up counter. The backup power supply is also used for retaining stand-by SRAM data thatcontains a battery parameter. When not monitoring batteries the device can stand by on low power, reducing the power consumption of the total system.
  • Secures RAM data, including backup RAM – ECC is incorporated and covers all RAM.
  • Incorporates many self-test functions – The TMPM358FDTFG incorporates many self-test functions for use in ISO26262-compliant systems.
  • ISO26262 certification for functional safety of software development process – Various software libraries will be developed under the above process and will be released to facilitate software development for the TMPM358FDTFG.