Hitachi, Ltd.

Renesas Technology Corp.

Renesas Electronics Corporation

Takanori Shimura

Koichiro Ishibashi

Hiroyuki Mizuno

Toshihiro Hattori

Masayuki Miyazaki

Yuichiro Morita

Kentaro Yoshimura

Kunio Uchiyama

Susumu Narita

Osamu Nishii

Yonetaro Totsuka

Yoichi Katsuki

Asako Sekine

Shunzo Yamashita

Kiyoshi Inoue

Akira Ichikawa

Yuji Ogata

Koji Ara

Kazuhiko Iwasaki

Hirohiko Sagawa

Tsuneo Funabashi

Yuji Toda

Junichi Tatezaki

Noboru Yamaguchi

Masahiro Abe

Kiyoshi Arai

Hiroshi Sakou

Atsushi Hatakeyama

Kanji Kato

Hisamitsu Kawaguchi

Hiroyuki Kuriyama

Kiyoshi Aiki

Mitsuru Akizawa

The feature of the present invention consists in: a processor main circuit for executing program instruction strings on a processor chip; a substrate bias switching unit for switching voltages of substrate biases applied to a substrate of the processor main circuit; and an operation mode control unit for controlling, in response to the execution of an instruction to proceed to a stand-by mode in the processor main circuit, the substrate bias switching unit in such a way that the biases are switched over to voltages for the stand-by mode, and for controlling, in response to an interruption of the stand-by release from the outside, the substrate bias switching unit in such a way that the biases are switched over to voltages for a normal mode, and also for releasing, after the bias voltages switched thereto have been stabilized, the stand-by of the processor main circuit to restart the operation.

Substrate bias switching unit for a low power processor

A radio control system for controlling a vehicle includes a transmission node for transmitting vehicle control data, the vehicle control data including at least one of a measured value of a vehicle state or a driver's manipulated variable and a control target value of a control actuator in the vehicle, a reception node for receiving the vehicle control data, and a plurality of radio communication routes between the transmission node and the reception node. A radio communication route that satisfies communication limit time of transmission data including the vehicle control data and satisfies lowest required reliability of the transmission data is selected from among the radio communication routes.

Radio communication system for controlling a vehicle

To secure a stable radio-communication performance in a sensor node, the sensor node with a radio-communication circuit and a sensor, for transmitting data measured by the sensor through radio-communication, includes a first board BOon which an antenna ANTconnected to the radio-communication circuit is placed, a case CASEcontaining the first board BO, and a band that is attached to the case CASEso as to fix the case CASEto the skin. The antenna ANTis placed in an upper portion of the case CASE, which corresponds to a 12 o'clock direction of a wristwatch.

Sensor node

In order to provide a semiconductor IC unit such as a microprocessor, etc., which satisfies both fast operation and lower power consumption properties with its high quality kept, the semiconductor IC unit of the present invention is composed so as to include a main circuit (LOG) provided with transistors, which is formed on a semiconductor substrate, and a substrate bias controlling circuit (VBC) used for controlling a voltage to be applied to the substrate, and the main circuit includes switching transistors (MNand MP) used for controlling a voltage to be applied to the substrate and control signals output from the substrate bias controlling circuit is entered to the gate of each of the switching transistors and the control signal is returned to the substrate bias controlling circuit.

Semiconductor integrated circuit including charging pump

This invention achieves lower electric power consumption of a sensor node for carrying out an intermittent operation, in a sensor net system. A time when the sensor node transmits a signal to a base station is estimated. Then, in accordance with the estimation, a table for storing a signal transmitted from the sensor node is installed in a wireless section of the base station. Consequently, a communication time between the sensor node and the base station can be made shorter. Also, a start time of a micro computer is set for RTC inside the sensor node, so the micro computer inside the sensor node can be put in the standby state.

Sensor node, base station, and sensor network system

Radio communications system for controlling a vehicle

An exhaust gas diagnosis system and a vehicle control system for automotive vehicles to reduce the communication lines and the power lines connected to the antiweatherability-required exhaust gas sensor arranged on the exterior of the vehicle are disclosed. The exhaust gas diagnosis system is configured of an engine control unit (electronic control unit), radio terminal units having the sensor function to detect the exhaust gas, and a radio communication repeater to conduct communication and share a part of the process executed by the conventional engine control unit. The communication lines between the sensor and the electronic control unit and the power lines to the sensor required in the conventional systems are eliminated while at the same time reducing the load on the electronic control unit.

Exhaust gas diagnosis system and vehicle control system

Semiconductor integrated circuit

Growing community of inventors

Chiba, Japan

Takanori Shimura