PS081 datasheet(63/155 Pages) AMSCO

63 / 155 page

acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de

4-6

PSØ81

> 5cm 5 to 3 cm

< 3 cm

big

medium small

Configuration:

Config.bit

big medium small Function

lcd_fastld[1:0]

Configures the number of fastload periods

(10ms) with low-ohmic voltage divider

lcd_swload1k

0 = charge capacitors by 200 Ohm resistors

1 = charge capacitors by 1 kOhm resistors

not relevant in direct drive mode

4.2.2.3

Direct Drive

A third option is to drive the LCD directly from the power supply without regulation. Therefore no

external capacitors are needed and the output drivers are set low resistive.

lcd_r_const

= 0

(10 kOhm).

lcd_vlt[1:0]

= 0

2.0 V

Nonetheless, it might be helpful to have 1 µF capacitors at CPUMP1 and CPUMP2 for better noise

reduction, as shown in figure 4.2.

In Direct Drive mode it is recommended to use an LCD frequency as low as possible, e.g.

lcd_freq = 1. The direct drive mode is generally the recommended operation mode for driving

an LCD with the internal LCD-driver.

4.2.2.4

LCD Output Driver Configuration

The internal resistance of the output drivers can be adopted to the size of the display. By this means

the current consumption can be optimized. The size of the display influences

• The inner resistance of the drivers

• The minimum charge time of the charge pump

• The reload time of the display

Figure 4.3 LCD

Segmentsize

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