Renesas Electronics Corporation

Kazuaki Kubo

Satoshi Kondo

Takahiro Yashita

Kikuo Kato

Noriyuki Itano

Kazuyoshi Takai

Koichiro Hashimoto

A semiconductor device includes an output driving circuit configured to output an output current to an output terminal; a detection resistor connected between the output terminal and the output driving circuit; an amplification unit configured to output an analog detection signal generated by amplifying a voltage between both ends of the detection resistor; a current generation circuit configured to output a reference current; a reference resistor connected between the current generation circuit and a ground and configured to output a reference voltage according to the reference current; an A/D converter configured to convert the analog detection signal into a digital detection signal using the reference voltage as a reference; and a control circuit configured to control the output current output from the output driving circuit according to the digital detection signal. The detection resistor has a same temperature characteristics as the reference resistor.

Semiconductor device, in-vehicle valve system and solenoid driver

There is a need to provide a semiconductor device and an electronic control system including the same while the semiconductor device is capable of continuing normal operation even when a negative surge voltage is applied. According to an embodiment, a driver IC includes an output transistor, a driver control circuit, a negative potential clamp circuit, and an ESD protection circuit. The output transistor is provided between a battery voltage terminal and an output terminal coupled to a load. The driver control circuit switches on-off state of the output transistor by controlling a gate voltage of the output transistor with reference to a voltage of the output terminal. The negative potential clamp circuit turns on the output transistor regardless of control from the control circuit when a negative voltage lower than a predetermined voltage is applied to the output terminal. The ESD protection circuit is provided between battery the voltage terminal and the reference voltage terminal and enters a conduction state when a surge voltage is applied to the battery voltage terminal.

Semiconductor device and electronic control system having the same

An output driving circuit outputs an output current to a solenoid incorporated in a vehicle through an output terminal. A detection resistor connected between the output terminal and the output driving circuit. An amplification unit configured to output an analog detection signal generated by amplifying a voltage between both ends of the detection resistor. A current generation circuit configured to output a reference current. A reference resistor connected between the current generation circuit and a ground and configured to output a reference voltage according to the reference current. An A/D converter configured to convert the analog detection signal into a digital detection signal using the reference voltage as a reference. A control circuit configured to control the output current output from the output driving circuit according to the digital detection signal.

In a power phase period when in normal operation, switch portions SWH and SWL and switch portions SWH and SWL are turned ON, respectively, and switch portions SWH and SWL are turned OFF. And floating power supply is provided from an electrostatic capacitance element CS to buses A and B, a floating control circuit, a transmitter circuit, and a receiver circuit, respectively. In a data phase period, the switch portions SWH and SWL are turned ON, and the switch portions SWH, SWL, SWH, and SWL are turned OFF. By that manner, the electrostatic capacitance element CS is charged by the power supply of a battery B, and an electrostatic capacitance element CH provides the floating power supply to the floating control circuit, the transmitter circuit, and the receiver circuit, respectively. By this manner, a floating switch unitin which the number of the switch portions is considerably reduced can be configured.

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Tokyo, Japan

Kazuaki Kubo