UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 2

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

1. BLOCK DIAGRAM....................................................................................................................................... 5
2. PIN CONFIGURATION (PAD LAYOUT) ..................................................................................................... 6
3. PIN FUNCTIONS.......................................................................................................................................... 9
4. PIN I/O CIRCUITS AND RECOMMENDED CONNECTION OF UNUSED PINS...................................... 14
5. DESCRIPTION OF FUNCTIONS............................................................................................................... 15
2
3.1 Power Supply System Pins ................................................................................................................................ 9
3.2 Logic System Pins ............................................................................................................................................ 10
3.3 Driver-Related Pins........................................................................................................................................... 13
3.4 Test Pins........................................................................................................................................................... 13
5.1 CPU Interface .................................................................................................................................................... 15
5.2 Display Data RAM ............................................................................................................................................. 19
5.3 Blink/Reverse Display Circuit.......................................................................................................................... 22
5.4 Oscillator........................................................................................................................................................... 24
5.5 Display Timing Generator................................................................................................................................ 28
5.6 Power Supply Circuit ....................................................................................................................................... 30
5.7 LCD Display Drivers ......................................................................................................................................... 39
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.6.1
5.6.2
5.6.3
5.6.4
5.7.1
5.7.2
Selection of interface type ...................................................................................................................... 15
Parallel interface..................................................................................................................................... 15
Serial interface........................................................................................................................................ 16
Chip select.............................................................................................................................................. 16
Display data RAM and on-chip register access ...................................................................................... 16
Display data RAM................................................................................................................................... 19
X address circuit ..................................................................................................................................... 19
Column address circuit ........................................................................................................................... 21
Y address circuit ..................................................................................................................................... 21
Common scan circuit .............................................................................................................................. 21
Display start line set ............................................................................................................................... 21
Display data latch circuit ......................................................................................................................... 21
Booster ................................................................................................................................................... 30
Voltage regulator .................................................................................................................................... 32
Use of op amp for level power supply control ......................................................................................... 35
Application examples of power supply circuits........................................................................................ 36
Full-dot pulse width modulation .............................................................................................................. 39
Full-dot frame rate control....................................................................................................................... 44
TABLE OF CONTENTS
Data Sheet S15745EJ2V0DS
µ µ µ µ PD16488A