UPD16667 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD16667

160-OUTPUT LCD ROW DRIVER

NEC => Renesas Technology 

BLOCK DIAGRAM

X1 to X160

µPD16667

VDD

Liquid-crystal drive circuit

V1

VEE

Selection control circuit

Q1 to Q80

Bidirectional shift register

Level shifter

DIR

VCC1

VSS

L1

L2 /DOFF’

STB

/FRM

Column driver interface

Remark /xxx indicates active low signal.

BLOCK FUNCTION

1. Liquid-crystal drive circuit

This circuit selects and outputs the level for liquid-crystal driving.

One of VDD, VEE, and V1 is selected by the output of the selection control circuit.

2. Selection control circuit

This circuit creates the signal which will select the level of the output signal, based on the output of the shift

register circuit and the driving level power selection signals L1 and L2

3. Bidirectional shift register circuit

This refers to the 80-bit bidirectional shift register circuit. The DIR signal can be used to switch over the shift

direction.

The data that has been entered from the /FRM pin is shifted by the low drive signal strobe (STB).

4. Level shifter circuit

This circuit transforms the 5-V signals to the high-voltage signals for liquid-crystal driving.

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