UPD16488AP datasheet(39/91 Pages) NEC

Part #	UPD16488AP

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

PDF	91 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

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

Logo

39 / 91 page

Data Sheet S15745EJ2V0DS

µµµµPD16488A

5.7

LCD Display Drivers

µPD16488A includes a full dot driver. The full dot driver has a 33-level gray-scale palette (eight levels of pulse width

modulation plus four-frame rate control), from which four levels of gray scale can be selected and registered as the IC's

output gray-scale palette (refer to 6.23 Gary scale registers 1 to 4 (R23 to R26)).

5.7.1 Full-dot pulse width modulation

The

µPD16488A's pulse width modulator divides the normal LCD display signal's segment pulse width by eight and

outputs in synch with the dot output timing based on the ratio (1/8 to 8/8 pulses) for the gray-scale palette that has been

selected via a command.

Figure 5-20. Full-Dot Pulse Width Modulation

1234 5678

90 91 92

12 3456 78

1/8

4/8

6/8

8/8

VLCD

VLC1

VLC2

VLC3

VLC4

VSS

SEG1

VLCD

VLC1

VLC2

VLCD

VLC1

VLC2

VLC3

VLC4

VSS

COM1

1 frame

Enlarged section

Caution There is no pulse width modulation for common outputs.

UPD16488AP Datasheet(PDF) 39 Page - NEC