AS8218 datasheet(49/123 Pages) AMSCO

49 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 49 of 123

Typical Display

The LCD above is a typical example of those used in electricity meter applications and consists of a number of

digits (generally up to 8 digits) including decimal points. Typically, annunciators (‘kWh’, ‘Volt’, etc.) are also

included to signify the type of data on display.

LCD Drive (LCD_DRIVE)

LCD drive mode is 1/4duty, 1/3bias.

4 back planes

24 segment drives (maximum)

All other parameters are listed in the table below:

Parameter

Symbol

Min

Typ

Max

Unit

Notes

LCD frame frequency

fLCD

39.4

LCD voltage

VLCD

2.3

2.5

2.75

for selvlcd=’000’

0.95 x VLCD

VLCD

1.05 x VLCD

0.95 x 2/3VLCD 2/3VLCD 1.05 x 2/3VLCD

0.95 x 1/3VLCD 1/3VLCD 1.05 x 1/3VLCD

LCD segment and back

plane drive voltages

VSS

LCD DC component

VDCLCD

-20

LCD drive impedance

RLCD

100

LCD load on each driver pin

Cload

300

Note:

These frequencies are derived from the master clock (3MHz; 3.58MHz; 4MHz) using a divider of 90,909.

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