UPD16498 datasheet(2/95 Pages) NEC

2 / 95 page

Data Sheet S15730EJ2V0DS

µµµµPD16498

TABLE OF CONTENTS

1. BLOCK1. BLOCK DIAGRAM ................................................................................................................... 5

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

3. PIN FUNCTIONS ...................................................................................................................................... 10

3.1 Power Supply System Pins ............................................................................................................................ 10

3.2 Logic System Pins .......................................................................................................................................... 11

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

3.4 Test Pins ......................................................................................................................................................... 14

4. PIN I/O CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS .................................... 15

5. DESCRIPTION OF FUNCTIONS ............................................................................................................. 16

5.1 CPU Interface

....................................................................................................................................... 16

5.1.1 Selection of interface type

............................................................................................................ 16

5.1.2 Parallel interface

........................................................................................................................... 16

5.1.3 Serial interface

............................................................................................................................ 18

5.1.4 Chip select

................................................................................................................................... 18

5.1.5 Display data RAM and on-chip register access

................................................................................ 18

5.2 Display Data RAM

................................................................................................................................ 21

5.2.1 Display data RAM .................................................................................................................................... 21

5.2.2 X address circuit ..................................................................................................................................... 21

5.2.3 Column address circuit ............................................................................................................................ 23

5.2.4 Y address circuit ...................................................................................................................................... 23

5.2.5 Common scan circuit ............................................................................................................................... 23

5.2.6 Display start line set ................................................................................................................................. 23

5.2.7 Display data latch circuit .......................................................................................................................... 23

5.3 Blink/Reverse Display Circuit ......................................................................................................................... 24

5.4 Oscillator .......................................................................................................................................................... 26

5.5 Display Timing Generator ............................................................................................................................... 30

5.6 Power Supply Circuit ....................................................................................................................................... 31

5.6.1 Booster .................................................................................................................................................... 31

5.6.2 Voltage regulator ..................................................................................................................................... 33

5.6.3 Use of op amp for level power supply control .......................................................................................... 36

5.6.4 Application examples of power supply circuits ......................................................................................... 37

5.7 LCD Display Drivers ........................................................................................................................................ 40

5.7.1 Full-dot pulse width modulation ............................................................................................................... 40

5.7.2 Full-dot frame rate control ........................................................................................................................ 45

5.7.3 Line shift driver ........................................................................................................................................ 46

5.7.4 Display size settings ................................................................................................................................ 48

5.7.5 Setting of LCD AC driver's inversion cycle and AC driver's inversion position ......................................... 48

UPD16498 Datasheet(PDF) 2 Page - NEC

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