UPD16488AP datasheet(9/91 Pages) NEC

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Data Sheet S15745EJ2V0DS

µµµµPD16488A

3. PIN FUNCTIONS

3.1

Power Supply System Pins

Symbol

Name

Pad No.

I/O

Description

VDD1

Logic power supply

70-72, 78, 86, 94,

104, 146

−

Power supply pin for logic circuit

VDD2

Boost circuit

power supply pin

67-69

−

Power supply pin for booster

VSS

Logic and driver

ground pin

6, 25, 28, 73 to 75, 81,

89, 99, 143, 149, 158

−

Ground pin for logic and driver circuits

VOUT

Driver power

supply pin

26, 27

−

Power supply pin for driver. Output pin for on-chip booster.

Connect a 1

µF boost capacitor between this pin and the GND

pin.

If not using the on-chip booster, a direct driver power supply can

be input.

VLCD,

VLC1 to VLC4

Reference power

supply pins for

driver

24, 23,

22 to 15

−

These are reference power supply pins for the LCD driver.

Connect a capacitor between these pins and the GND pin if an

internal bias has been selected.

C1+, C1−

C2+, C2−

C3+, C3−

C4+, C4−

C5+, C5−

C6+, C6−

C7+, C7−

C8+, C8−

C9+, C9−

Boost capacitor

connection pins (1)

64, 63, 62, 61

60, 59, 58, 57

56, 55, 54, 53

52, 51, 50, 49

48, 47, 46, 45

44, 43, 42, 41

40, 39, 38, 37

36, 35, 34, 33

32, 31, 30, 29

−

These are capacitor connection pins for the booster. When

using the on-chip booster, connect a 1

µF capacitor between

positive (+) and negative (-) pins.

C1A

Boost capacitor

connection pin (2)

65, 66

−

This is a capacitor connection pin for boost adjustment. When

using the on-chip booster, connect a 1

µF capacitor between

this pin and the GND pin.

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