Semiconductor Device and Multi-Turn Encoder
AssigneeMitsubishi Electric Corporation
InventorsAkio KAMIMURAI, Takeshi MUSHA
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Abstract
An environmental power generation device outputs power generation charges to a power supply line to which a capacitor is connected. When a power generation voltage corresponding to a charging voltage for the capacitor is equal to or higher than an power-on criterion voltage, a voltage comparison circuit outputs a voltage detection signal. An internal circuit of a semiconductor device is powered on in response to the voltage detection signal. A setting change circuit switches the power-on criterion voltage in accordance with a setting input.
Claims16
A semiconductor device connected to a power supply line to which power generation charges from an environmental power generation device are outputted, the semiconductor device comprising:
- a voltage comparison circuit to output a voltage detection signal when a power generation voltage corresponding to a charging voltage for a capacitor connected to the power supply line is equal to or higher than a power-on criterion voltage;
- an internal circuit powered on in response to the voltage detection signal from the voltage comparison circuit;
- and
- a setting change circuit to switch the power-on criterion voltage in accordance with a first setting input.
The semiconductor device according to claim 12, wherein
- the internal circuit includes
- a constant voltage circuit powered on in response to the voltage detection signal to generate a power supply voltage by using the power generation voltage from the power supply line as input,
- a digital circuit to operate upon receiving the power supply voltage from the constant voltage circuit, and
- a non-volatile memory for input and output of data to and from the digital circuit while the digital circuit operates.
Dependencies are inferred from the claim text.