EP 0333353 A3 19911023 - DUAL MODE VOLTAGE REFERENCE CIRCUIT AND METHOD
Title (en)
DUAL MODE VOLTAGE REFERENCE CIRCUIT AND METHOD
Publication
Application
Priority
US 16930888 A 19880317
Abstract (en)
[origin: EP0333353A2] A voltage reference circuit is described which is capable of providing either an internally generated voltage having a trimming capability, or an externally generated voltage, with the use of only two pins (2,4). The internal voltage is connected through an interrupt circuit (T2,T3,R4,R5,R7) to an input/output terminal (2), which can also receive an externally generated voltage. A trimming terminal (4) is used to apply trimming voltage signals to adjust the internally generated voltage. To convert from the internal (8,A1) to the external voltage source (20), an interrupt voltage is applied to the trimming terminal (4) which is outside of the normal trimming voltage range. This interrupt voltage actuates an interrupt circuit (T2,T3,R4,R5,R7) to interrupt the connection (T1) between the internal voltage source (8,A1) and input/output terminal (2), leaving the output terminal (2) available for the external voltage source (20).
IPC 1-7
IPC 8 full level
G05F 1/56 (2006.01)
CPC (source: EP)
G05F 1/56 (2013.01)
Citation (search report)
- [A] DE 3710865 A1 19871022 - TOSHIBA KAWASAKI KK [JP]
- [A] GB 2056805 A 19810318 - NIPPON ELECTRIC CO
- [A] WESCON CONFERENCE RECORD, North Hollywood, September 1977, pages 1-5; J. SIMMONS: "Microprocessor 8-bit D/A-converter"
- [A] ELECTRONICS, 13th April 1978, pages 99-105, New York, US; P. BROKAW: "I2L puts it all together for 10-bit a-d converter chip"
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0333353 A2 19890920; EP 0333353 A3 19911023; JP H01271812 A 19891030
DOCDB simple family (application)
EP 89302113 A 19890302; JP 6579589 A 19890317