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Toshiba Launches Li-ion Battery Monitor Chipset for Automotive Applications

published: 2012-11-08 14:48

Li-ion Battery Monitor Chipset for Automotive Applications

TB9141FG, left, Battery Monitor IC. TMPM358FDTFG, right, Microcontroller

Toshiba Corporation (TOKYO: 6502) announced it will launch a lithium-ion battery monitor chipset for automotive applications. The battery monitor IC integrated into the chipset is the industry's first1 to be able to manage up to 16 cells per 1 IC, allowing for a reduction of components and the development of simple, low cost battery monitoring systems.

The chipset, which integrates a battery monitor IC (TB9141FG), and microcontroller (TMPM358FDTFG), detects the remaining charge level and equalizes it among cells (cell balancing) and can also detect abnormal battery status. It is an ideal choice that delivers enhanced battery management technology which is required for hybrid electric vehicles (HEVs) and electric vehicles (EVs).

The TB9141FG uses 96V high-voltage process and realizes monitoring of a 16-cell Li-ion battery with a single IC. The TB9141FG is able to communicate in a noisy environment, using differential signaling in a daisy chain communication link between two or more TB9141FGs, an important feature for automotive applications.

The TMPM358FDTFG is a 32-bit RISC microcontroller built around an ARM CortexTM-M32 core and is compliant with functional safety standards (IEC61508 / ISO26262). The device achieves a battery monitor system with low power consumption, due to its back up RAM function, sleep function3 and Toshiba's original low power technologies.

Toshiba will provide a reference model mounting the TB9141FG and the TMPM358FDTFG and a software library to be compliant with functional safety standards. It allows customers to easily create their own battery monitor system.

Toshiba is promoting the battery monitor chipset business and developing products that meet all functional requirements in a market that is expected to grow with increasing demand for HEVs and EVs. The company targets a 25% market share by FY2017.


Sample and reference model shipments of this chipset will start in February and March 2013 respectively. Mass production will start in April 2014. Sample prices of TB9141FG and TMPM358FDTFG are 800 yen and 1,000 yen (include tax), respectively.

Reference Model

TB9141FG Battery Monitor IC Key Features

1. Monitor up to 16 cells

The TB9141FG uses 96V high-voltage process and realizes monitoring of a 16-cell Li-ion battery with a single IC. The TB9141FG will promote the development of lower cost battery monitoring systems with fewer components.

2. Noise tolerant communication

Differential configuration is introduced in daisy chain communication between each TB9141FG for stable communication even in a noisy environment, an essential quality for battery monitoring in automotive applications.

3. ±2mV (typ.) cell-voltage-measurement-accuracy

The TB9141FG realizes typical ±2mV cell-voltage-measurement-accuracy that improves the accuracy of battery state of charge (SOC) detection and contributes to effective use of the battery.

4. Voltage measurement in operating cell balancing

The TB9141FG incorporates a cell balance switch and is able to measure battery voltage while carrying out cell balancing.

5. Built-in self-test functions

The TB9141FG incorporates many self-test functions for use in ISO26262 compliant systems.

TMPM358FDTFG Microcontroller Key Features

1. Backup function in power down status of CortexTM-M32 core.

The TMPM358FDTFG incorporates a backup power supply for a 16-bit pre scalar counter, 32-bit up counter and for retaining stand-by SRAM data which contains a battery parameters. As the device can stand-by on low power when not monitoring batteries, power consumption of the total system can be reduced.

2. ECC function

ECC (Error Check & Correct) function is incorporated and secures all RAM area.

3. Built-in self-test functions

The TMPM358FDTFG incorporates many self-test functions for use in ISO26262 compliant systems.

4. Software libraries developed under ISO26262 certificated process4

Various software libraries will be developed under ISO26262 certificated process and released to facilitate development of customer software for TMPM358FDTFG.

Main specifications of the new products

Part number


Absolute maximum rating


Operating temperature

-40 to 105°C

Maximum monitoring cell

16 cells

Cell voltage measurement accuracy                             

±2mV (typ.)

Consumption current

Shutdown mode: <1μA
Stand-by mode: 10μA(typ.)
Normal mode: 150μA(typ.)


LQFP 64 pins, 10mm × 10mm, 0.5mm pitch


Part number



ARM CortexTM-M32core (32-bit)

Built-in ROM and RAM

FLASH: 512Kbytes5
RAM: 64Kbytes
Stand-by RAM: 16Kbytes

Built-in peripheral functions

CAN Controller

3 ch

UART Interface

2 ch

ESEI Interface

3 ch


6 units

24-bit PWM generator 

3 ch

12-bit AD converter 

10 ch×2 units

Power Supply

4.5 to 5.5V

Operating frequency


Operating temperature

-40 to 105°C


LQFP 100 pins, 14mm×14mm, 0.5mm pitch


1. As a Li-ion battery monitor IC for automotive application. As of November 8, Survey by Toshiba.

2. Cortex is a trademark of ARM Limited.

3. A function that operates back-up power which operates even when CortexTM-M3 core power down, 16-bit pre scalar counter and 32-bit up counter and can be resumed to normal mode by Timer counter.

4. Toshiba has obtained ASIL-D, certification related to software development process in ISO26262, a functional safety standard for automotive applications, in March 2012.

5. 1Kbyte=1,024(210) bytes 

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