UPD16661A View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16661A

160-OUTPUT LCD COLUMN (SEGMENT) DRIVER WITH RAM

NEC => Renesas Technology 

5 12. CHIP SET POWER SUPPLY INPUT SEQUENCE

It is recommended that the power supply be input in the following way.

VCC2 → VCC1 → input → VDD, VEE → V1, V2

Make sure that the LCD drive voltages are input last.

VCC2

VCC1

OFF

OFF

ON

ON

4.5 V

CPU Interface Note1

(A0 to A16, /CS, /OE,

/WE, /UBE,D0 to D15,

/DOFF)

/RESET

V Note2

DD

At least 0 s 3.3 V

0V

3.3 V

0V

0.3 VCC2

At least 0 s

At least 100 ns ON

OFF

OFF

V Note2

EE

ON

V1

OFF

V2

OFF

ON

At least 0 s

ON

µPD16661A

Notes 1. Inputting the selection pins (PL0, PL1, PL2, DIR, MS, BMODE) at the same time as the VCC2 pin

is unproblematic.

2. It is not necessary to turn ON VDD and VEE at the same time.

VDD and VEE are the liquid-crystal power supplies of the row driver.

Caution Disconnection of the chip set power supply is done in the reverse order of the input

sequence.

20

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