Semiconductor start control device, method, and system

A start control method for a semiconductor device, comprising:

• generating a first reference voltage by detecting that an external power supply is turned on;
• generating an internal power supply voltage based on the external power supply;
• generating a bias voltage, to which a capacitive element is coupled as a load, based on a second reference voltage dependent on the first reference voltage by detecting that the first reference voltage reaches a given level;
• comparing the bias voltage with a monitor voltage dependent on one of an external power supply voltage and the internal power supply voltage by detecting that the first reference voltage reaches a given level;
• and
• starting an internal circuit.

A system which includes a controller and a semiconductor device controlled by the controller, the semiconductor device comprising:

• an external power supply detection circuit configured to detect that an external power supply is turned on and output a first detection signal;
• an internal power supply voltage generation circuit configured to generate an internal power supply voltage based on the external power supply;
• a reference voltage generation circuit configured to generate a first reference voltage in response to the first detection signal;
• a reference voltage detection circuit configured to detect that the first reference voltage reaches a given level and output a second detection signal;
• a bias voltage generation circuit configured to generate, in response to the second detection signal, a bias voltage to which a capacitive element is coupled as a load, based on a second reference voltage dependent on the first reference voltage;
• and
• a power supply voltage detection circuit configured to compare, in response to the second detection signal, the bias voltage with a third reference voltage dependent on one of an external power supply voltage and the internal power supply voltage, and output a start signal.