32bit microcontroller with built-in resolver sensor interface for electric vehicle motors

32bit microcontroller with built-in resolver sensor interface for electric vehicle motors

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By eeNews Europe

The new MCU is a derivative of Renesas’ P Series of MCUs and belongs to the 32-bit V850 RISC MCU Family. It incorporates Renesas’ V850E2 CPU core, which provides excellent real-time operation, and is equipped with a rich set of peripheral functions for motor control. Renesas’ P Series of MCUs is widely adopted as motor control system solutions for automotive applications. With the combination of P Series’ dual core lockstep and on-chip resolver sensor interface, the V850E2/PJ4-E MCU is compliant with the ISO 26262 safety standard and easily realizes lower system costs.
Hybrid electric vehicles (HEVs) and electric vehicles (EVs) are rapidly advancing as countermeasures against global warming by cutting CO2 emissions by automobiles. Improvement in controlling function of a driving motor is a key technology for supporting the environmental performance of HEVs/EVs. The V850E2/PJ4-E MCU is introduced to meet the market needs including lower system costs, providing the perfect support for further promoting eco-friendly HEVs/EVs and safety requirements of ISO 26262.
The MCU integrates Renesas’ newly developed on-chip resolver sensor interface that links to a wide range of resolver sensors, eliminating the need for an external resolver-digital (R/D) converter. An excitation signal generating function (TPBA) for a resolver sensor is also equipped to offer optimum system configuration for driving motor control. The V850E2/PJ4-E device also includes many peripheral functions including a high-precision motor control timer (TSG2) that complies with control of various motors and an A/D converter with synchronized sample-and-hold (S/H) function that enables more precise measurement of data from each sensor.
The CPU core uses a dual core lockstep system where a comparator continually calculates and detects failures, making it possible to achieve a real-time high failure detection rate via only hardware. The new MCU is suitable for a wide range of applications, especially those that require motor control, which need to meet the high safety requirements of ISO 26262.
With 1MB of ROM, 80KB of RAM and 128MHz CPU frequency, the V850E2/PJ4-E MCU achieves the higher performance needed for fast diversified controlling functions. Communication with other controlling units is also available and standard CAN, SCI and UART interfaces are available for communication functions. It can operate in environments between −40℃ to +125℃. It also contains a regulator circuit that enables single power supply operation at 5V with an external transistor.
Samples of the V850E2/PJ4-E MCU will be available in March 2012. Mass production is scheduled to begin in April 2013 and is expected to reach a volume of 50,000 units per month.
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