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US 6,674,623 B1Granted
Microcomputer equipped with built-in temperature sensor
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsToshihiro Abe, Shintaro Mori, Fumihiko Terayama, Masahiro Kitamura, Seiichi Yamazaki, Yasuo Moriguchi
Life of this patent
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Abstract
In a microcomputer equipped with a built-in temperature sensor, diodes as a temperature sensor are incorporated in a pair of circuit blocks, respectively, and placed in opposite polarity connection to each other. When detecting a temperature of the microcomputer, a constant current If is supplied to the diodes through terminals commonly connected to both the diodes. A voltage Vf generated at each diode is read through terminals located at more adjacent nodes to the diode when compared in position with the terminals.
Claims13
A microcomputer equipped with a built-in temperature sensor, comprising:
- diodes incorporated in a pair of circuit blocks, said diodes being placed in opposite polarity connection to each other;
- a first terminal group connected commonly to said each diode, through which a constant current is supplied;
- and
- a second terminal group through which a voltage generated at each diode is read, and connected commonly to and placed at more adjacent nodes to said each diode when compared with said first terminal group.
1 more element
A microcomputer equipped with a built-in temperature sensor, comprising:
- a diode incorporated in each of a plurality of circuit blocks;
- a first terminal group connected commonly to said each of said plurality of diodes, through which a constant current is supplied;
- a second terminal group through which a voltage generated at each of said plurality of diodes is read, and connected commonly to and placed at more adjacent nodes to said each of said plurality of diodes when compared with said first terminal group;
- a selection switch for selecting one of said plurality of diodes;
- and
- a selection register in which a prescribed value to control operation of said selection switch is stored.
3 more elements
A microcomputer equipped with a built-in temperature sensor, comprising:
- a temperature sensor circuit comprising a diode and a first resistance connected in series between a first power source voltage and a second power voltage source;
- a MOS inverter circuit comprising:
- a first MOS transistor whose gate is connected to a node through which said diode and said first resistance being connected;
- and
- a second resistance connected to said first MOS transistor in series,
- wherein said second resistance is connected to said first power source voltage, and said first MOS transistor is connected to said second power source voltage, and
- a terminal connected to a second node through which said second resistance and said first MOS transistor being connected,
- wherein said temperature sensor circuit and said MOS inverter circuit forms a voltage break circuit.
5 more elements
A microcomputer equipped with a built-in temperature sensor, comprising:
- a voltage break circuit comprising:
- a temperature sensor circuit placed in a circuit block comprising a diode and a first resistance connected in series to a first power source voltage and a second power source voltage;
- a first MOS transistor whose gate is connected to a first node through which said diode and said first resistance are connected;
- and
- a second resistance connected in series to said first MOS transistor,
- wherein said second resistance is connected to said first power source voltage, and said first MOS transistor is connected to said second power source voltage, and
- a power source voltage generation circuit in which a selector is incorporated, said selector inputs a control voltage signal output from said voltage break circuit, and selects one of a first voltage and a second voltage based on a level of said control voltage signal, and outputs said voltage.
4 more elements
A microcomputer equipped with a built-in temperature sensor, comprising:
- a temperature sensor circuit comprises a diode and a first resistance connected in series between a first power source voltage and a second power voltage source;
- an A/D converter for converting an analogue voltage value at a first node through which said diode and said first resistance to a digital voltage value;
- a temperature monitor register for storing said digital voltage value output from said A/D converter;
- a prescribed value register for storing a prescribed value;
- a comparator for comparing said digital voltage value in said temperature monitor register and said prescribed value stored in said prescribed value register, and for outputting a comparison result;
- and
- a power source voltage generation circuit in which a selector is incorporated, said selector for selecting one of a first voltage and a second voltage based on a level of said comparison result, and for outputting said selected voltage.
4 more elements
A microcomputer equipped with a built-in temperature sensor, comprising:
- a voltage break circuit comprising:
- a temperature sensor circuit incorporated in a circuit block comprising a diode and a first resistance connected in series to a first power source voltage and a second power source voltage;
- a MOS transistor whose gate is connected to a first node through which said diode and said first resistance are connected;
- and
- a second resistance connected in series to said MOS transistor,
- wherein said second resistance is connected to said first power source voltage, and said MOS transistor is connected to said second power source voltage, and
- a wait control circuit in which a selector is incorporated, said selector inputs a control voltage signal output from said voltage break circuit, and selects one of a first clock signal of a first cycle and a second clock signal of a second cycle based on a level of said control voltage signal, and outputs said selected clock signal in order to adjust an accessing time by which an external device is accessed correctly.
4 more elements
Dependencies are inferred from the claim text.