UPD16488AP datasheet(2/91 Pages) NEC

Part #	UPD16488AP

Description	1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM

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Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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Data Sheet S15745EJ2V0DS

2

µµµµPD16488A

TABLE OF CONTENTS

1. BLOCK DIAGRAM....................................................................................................................................... 5

2. PIN CONFIGURATION (PAD LAYOUT) ..................................................................................................... 6

3. PIN FUNCTIONS.......................................................................................................................................... 9

3.1 Power Supply System Pins................................................................................................................................ 9

3.2 Logic System Pins ............................................................................................................................................ 10

3.3 Driver-Related Pins........................................................................................................................................... 13

3.4 Test Pins........................................................................................................................................................... 13

4. PIN I/O CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS...................................... 14

5. DESCRIPTION OF FUNCTIONS............................................................................................................... 15

5.1 CPU Interface.................................................................................................................................................... 15

5.1.1 Selection of interface type ...................................................................................................................... 15

5.1.2 Parallel interface..................................................................................................................................... 15

5.1.3 Serial interface........................................................................................................................................ 16

5.1.4 Chip select.............................................................................................................................................. 16

5.1.5 Display data RAM and on-chip register access ...................................................................................... 16

5.2 Display Data RAM............................................................................................................................................. 19

5.2.1 Display data RAM................................................................................................................................... 19

5.2.2 X address circuit ..................................................................................................................................... 19

5.2.3 Column address circuit ........................................................................................................................... 21

5.2.4 Y address circuit ..................................................................................................................................... 21

5.2.5 Common scan circuit .............................................................................................................................. 21

5.2.6 Display start line set ............................................................................................................................... 21

5.2.7 Display data latch circuit......................................................................................................................... 21

5.3 Blink/Reverse Display Circuit.......................................................................................................................... 22

5.4 Oscillator........................................................................................................................................................... 24

5.5 Display Timing Generator................................................................................................................................ 28

5.6 Power Supply Circuit ....................................................................................................................................... 30

5.6.1 Booster ................................................................................................................................................... 30

5.6.2 Voltage regulator .................................................................................................................................... 32

5.6.3 Use of op amp for level power supply control ......................................................................................... 35

5.6.4 Application examples of power supply circuits........................................................................................ 36

5.7 LCD Display Drivers ......................................................................................................................................... 39

5.7.1 Full-dot pulse width modulation .............................................................................................................. 39

5.7.2 Full-dot frame rate control....................................................................................................................... 44

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