Title:
SUPPLY VOLTAGE DETECTION CIRCUIT
Document Type and Number:
Japanese Patent JP3937887
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a supply voltage detection circuit for stably detecting a plurality of supply voltages (multiple power supplies) where the supply voltages differ one another.
SOLUTION: A first power supply system is divided by a PMOS transistor MP1 and a resistor R1, and the voltage of the power supply is reflected on a signal appearing at a connection node N3. Additionally, a second power supply system is divided by resistors R2 and R3, and a signal level appearing at a connection node N4 is determined according to whether the gate threshold voltage of a PMOS transistor MP2 is exceeded or not. Further, a third power supply system is divided by PMOS transistors MHP1, MHP2, and a resistor R9, and the supply voltage is reflected on a signal appearing at a connection node N7. The signals appearing at the connection nodes are given to the gates of NMOS transistors MHN1-MHN3, thus generating a detection signal DETECT.
Inventors:
Nobuaki Tsuji
Masao Noro
Kunihiko Mitsuoka
Yasuhiko Sekimoto
Masao Noro
Kunihiko Mitsuoka
Yasuhiko Sekimoto
Application Number:
JP2002089329A
Publication Date:
June 27, 2007
Filing Date:
March 27, 2002
Export Citation:
Assignee:
Yamaha Corporation
International Classes:
G01R19/165; G05F1/10; H03F3/217; (IPC1-7): G01R19/165; H03F3/217; //G05F1/10
Domestic Patent References:
| JP6174760A | ||||
| JP2000019200A | ||||
| JP2001141761A | ||||
| JP1267767A | ||||
| JP11326398A | ||||
| JP64012862A |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Takashi Watanabe