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  NEC Electronic Components Datasheet  

D16488A Datasheet

UPD16488A

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D16488A pdf
DATA SHEET
MOS INTEGRATED CIRCUIT
µPD16488A
1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
DESCRIPTION
The µPD16488A is a controller/driver which includes display RAM for full-dot LCDs that can provide a four-level gray
www.DataSheet4sUca.cleomdisplay. This IC is able to drive full-dot LCDs that contain up to 128 x 92 dots.
FEATURES
LCD controller/driver with on-chip display RAM
Full dot outputs: 128 segment outputs and 92 common outputs
Can operate using single power supply (logic system) in range from 1.7 to 3.6 V.
Selection of four levels of gray scales from among 33 possible levels (four-frame rate control + 8 pulse width
modulation)
Serial data input and 8-bit parallel data input (i80 series interface and M68 series interface)
Dot display RAM: 128 x 128 x 2 bits
On-chip booster: Switchable from x2 to x9 modes
Selectable bias levels: 1/12 to 1/7 bias (normal display), 1/6 or 1/5 bias (partial display)
Duty settings: 1/92 to 1/1 duty
On-chip voltage divider resistor
On-chip oscillator
ORDERING INFORMATION
Part Number
µPD16488AP
µPD16488AW
Package
Chip
Wafer
Remark Purchasing the chip/wafer entails the exchange of documents such as a separate memorandum or product
quality, so please contact one of our sales representative.
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. S15745EJ2V0DS00 (2nd Edition)
Date Published December 2001 NS CP(K)
The mark  shows major revised points.
2001


  NEC Electronic Components Datasheet  

D16488A Datasheet

UPD16488A

No Preview Available !

D16488A pdf
TABLE OF CONTENTS
µPD16488A
1. BLOCK DIAGRAM....................................................................................................................................... 5
2. PIN CONFIGURATION (PAD LAYOUT) ..................................................................................................... 6
3. PIN FUNCTIONS.......................................................................................................................................... 9
www.DataSheet4U.c3o.m1 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
2 Data Sheet S15745EJ2V0DS


Part Number D16488A
Description UPD16488A
Maker NEC
Total Page 30 Pages
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