Low-voltage detection reset circuit
AssigneeSanyo Electric Co., Ltd.
InventorKazuo Hotaka
Life of this patent
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Abstract
A low-voltage detection reset circuit that suppresses a current consumption in a stand-by mode and is reduced in a size is offered. The low-voltage detection reset circuit is provided with a power-on reset circuit that operates only at power-on and outputs a reset pulse and is configured to set a detection level of a detection level setting circuit at a default value using the reset pulse and to activate a programmable low-voltage detection circuit. After the programmable low-voltage detection circuit is activated, a detection level of the programmable low-voltage detection circuit can be modified from the default value by a register.
Claims5
A low-voltage detection reset circuit comprising:
- a power-on reset circuit that outputs a first reset pulse in response to a rise of a power supply voltage;
- a detection level setting circuit that is capable of variably setting a detection level corresponding to the power supply voltage;
- a low-voltage detection circuit that compares the detection level with a reference voltage that is independent of the power supply voltage and outputs a second reset pulse when the detection level is equal to or lower than the reference level;
- and
- a control circuit that controls the detection level setting circuit so that the detection level is set to a default value in response to the first reset pulse.
Dependencies are inferred from the claim text.