SA8807A

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5.

On-Chip LCD Voltage Divider Disable

The integrated divider for the LCD voltages can be disabled by applying a high level

on the EN input (EN = 1).

6.

Contrast Setting

The contrast may be adjusted by applying an external LCD voltage on input V1, with

the internal voltage divider activated.

7.

Oscillator

The on-chip oscillator circuit requires one external capacitor for operation. The

capacitor value is calculated as follows:

C = 7µF.1Hz/f

f = Required oscillator frequency

The backplane multiplex rate is f/8 for 4-backplane mode and f/6 for 3-backplane

mode.

TYPICAL APPLICATION

The Application Circuit (Figure 1) shows the connections for a typical application when

using a 12 digit (7 segment) display, plus decimal points.