UPD16687 View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD16687

1/128 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM

NEC => Renesas Technology 

TABLE OF CONTENTS

µPD16686, 16687

1. PIN FUNCTIONS.................................................................................................................................... 14

1.1 Power Supply System Pins ............................................................................................................................14

1.2 Logic System Pins ..........................................................................................................................................15

1.3 Driver-Related Pins .........................................................................................................................................17

1.4 Test Pins ..........................................................................................................................................................18

2. PIN I/O CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS.................................. 19

3. DESCRIPTION OF FUNCTIONS ........................................................................................................... 20

3.1 CPU Interface...................................................................................................................................................20

3.1.1 Selection of interface type ...........................................................................................................................20

3.1.2 Parallel interface ..........................................................................................................................................20

3.1.3 Serial interface.............................................................................................................................................22

3.1.4 Chip select ...................................................................................................................................................22

3.1.5 Display data RAM and on-chip register access ...........................................................................................22

3.2 Display Data RAM............................................................................................................................................25

3.2.1 Display data RAM ........................................................................................................................................25

3.2.2 X address circuit ..........................................................................................................................................26

3.2.3 Column address circuit ................................................................................................................................26

3.2.4 Y address circuit ..........................................................................................................................................26

3.2.5 Common scan circuit ...................................................................................................................................26

3.2.6 Display start line set.....................................................................................................................................28

3.2.7 Display data latch circuit ..............................................................................................................................28

3.3 Blink/Reverse Display Circuit.........................................................................................................................29

3.4 Oscillator..........................................................................................................................................................31

3.5 Display Timing Generator...............................................................................................................................35

3.6 Power Supply Circuit ......................................................................................................................................37

3.6.1 Power supply circuit.....................................................................................................................................37

3.6.2 Booster ........................................................................................................................................................37

3.6.3 Voltage regulator .........................................................................................................................................39

3.6.4 Use of op amp for level power supply control ..............................................................................................42

3.6.5 Application examples of power supply circuits.............................................................................................43

3.7 LCD Display Drivers........................................................................................................................................46

3.7.1 Full-dot pulse width modulation ...................................................................................................................46

3.7.2 Full-dot frame rate control............................................................................................................................51

3.7.3 Line shift driver ............................................................................................................................................52

3.7.4 Display size settings ....................................................................................................................................54

3.7.5 Setting of LCD AC driver's inversion cycle and AC driver's inversion position.............................................54

Data Sheet S15548JJ1V0DS

11

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