Title:
CONSTANT-CURRENT DRIVING DEVICE AND CONSTANT-CURRENT DRIVEN SEMICONDUCTOR INTEGRATED CIRCUIT
Document Type and Number:
Japanese Patent JP3500322
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce variance among the outputs of semiconductor integrated circuits even when a load is driven divisionally by multiple semiconductor integrated circuits by outputting a constant current driving the load corresponding to a reference signal in each constant-current driven semiconductor integrated circuit from a drive circuit on the same semiconductor chip.
SOLUTION: Of a constant-current driver IC1, the constant-current driver circuit 10 supplies a driving current to 64 driving output terminals 001 to 064 according to a reference current inputted to a reference current input terminal IREF. A control circuit 11 turns ON or OFF the driving current outputted from the constant-current driver circuit 10 according to an input signal. A reference current generating circuit 12 generates reference currents having the same current value from three reference current output terminals OREF1 to OREF3 including a reference current output terminal for supplying a reference current ot the reference current input terminal of the constant-current driver circuit 10. Further, the values of the reference currents led out of the respective reference current output terminals OREF1 to OREF3 can be adjusted.
Inventors:
Yuji Yamaguchi
Application Number:
JP10291799A
Publication Date:
February 23, 2004
Filing Date:
April 09, 1999
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H01L27/04; G05F1/56; G09G3/20; G09G3/30; G09G3/32; H01L21/822; H01L33/00; (IPC1-7): G05F1/56; H01L21/822; H01L27/04; H01L33/00
Domestic Patent References:
| JP8169139A | ||||
| JP9174918A | ||||
| JP939296A | ||||
| JP6340114A | ||||
| JP3125205A |
Attorney, Agent or Firm:
Keiichiro Saikyo