JPS54136380A - Supply voltage detecting circuit - Google Patents
Supply voltage detecting circuitInfo
- Publication number
- JPS54136380A JPS54136380A JP4390778A JP4390778A JPS54136380A JP S54136380 A JPS54136380 A JP S54136380A JP 4390778 A JP4390778 A JP 4390778A JP 4390778 A JP4390778 A JP 4390778A JP S54136380 A JPS54136380 A JP S54136380A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- type mos
- supply voltage
- detecting circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To constitute the supply voltage detecting circuit completely in IC, by forming the detecting circuit with reference voltage generating circuit, supply voltage dividing circuit, and voltage comparator circuit.
CONSTITUTION: When a reference voltage generating circuit A is formed with P type MOS transistor TR1 and N type MOS transistor TR2, and resistance 3, potential Vs at point a is the sum of threshold voltage VTP of TR1 and threshold voltage VTN of TR2. Even if the voltages VTP, VTN fluctuate individually, such discrepancy is canceled and the sum is always stable. A voltage comparator circuit B consisting of P type MOS transistors TR4, 6 and N type MOS transistors TR5, 7 has two input terminals, of which one is connected to point (a) and the other to contact (b) of resistances 8, 9. By properly selecting the resistances 8, 9, when the battery reaches the life end voltage, an output is delivered from the comparator circuit B, so that the life of the battery may be detected. Thus, since the effect of variation in IC process of each circuit and temperature coefficients may be kept to a minimum, the circuit may be completely designed in IC.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4390778A JPS54136380A (en) | 1978-04-14 | 1978-04-14 | Supply voltage detecting circuit |
GB7904589A GB2020437B (en) | 1978-04-14 | 1979-02-09 | Voltage detecting circuit |
US06/024,441 US4309627A (en) | 1978-04-14 | 1979-03-27 | Detecting circuit for a power source voltage |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4390778A JPS54136380A (en) | 1978-04-14 | 1978-04-14 | Supply voltage detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54136380A true JPS54136380A (en) | 1979-10-23 |
Family
ID=12676776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4390778A Pending JPS54136380A (en) | 1978-04-14 | 1978-04-14 | Supply voltage detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54136380A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986003012A1 (en) * | 1984-11-12 | 1986-05-22 | Fanuc Ltd | Voltage comparator of a type of low power comsumption |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5174233A (en) * | 1974-12-24 | 1976-06-28 | Seiko Instr & Electronics | DENCHIJUMYOKEN SHUTSUKAIRO |
JPS5221870A (en) * | 1975-08-11 | 1977-02-18 | Seiko Instr & Electronics Ltd | Circuit for detecting battery voltage |
-
1978
- 1978-04-14 JP JP4390778A patent/JPS54136380A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5174233A (en) * | 1974-12-24 | 1976-06-28 | Seiko Instr & Electronics | DENCHIJUMYOKEN SHUTSUKAIRO |
JPS5221870A (en) * | 1975-08-11 | 1977-02-18 | Seiko Instr & Electronics Ltd | Circuit for detecting battery voltage |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1986003012A1 (en) * | 1984-11-12 | 1986-05-22 | Fanuc Ltd | Voltage comparator of a type of low power comsumption |
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