PS081 datasheet(62/155 Pages) AMSCO

62 / 155 page

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

4-5

PSØ81

divider factor = 448 + c10_div_lcd

lcd_pulsed[3:0] Automatically pulsed display, especially for stand-by in solar applications

Defines the period between the LCD switch-on as well as the on-time.

00xx

300 ms

blinking period

01xx

600 ms

blinking period

10xx

1 s

blinking period

11xx

2 s

blinking period

xx00

off

on-time

xx01

100 ms

on-time

xx10

200 ms

on-time

xx11

400 ms

on-time

en_noise_C10_lcd

= 0

off

= 1

Adding noise to the divider factor specified in c10_div_lcd.

4.2.2.1

3 V and 2.5 V operation with voltage doubling

Figure 4.1 Charge Pump with voltage doubling

In a first step both capacitors are charged to half the display voltage, 1.5 V or 1.25 V. This voltage

can be seen at pins CPUMP1 and CPUMP3. In a second step both capacitors are switched into

series. Pin CPUMP3 then shows the full LCD voltage while pins CPUMP1 and CPUMP2 show half the

LCD voltage.

4.2.2.2

2 V operation without voltage doubling

Figure 4.2 Charge Pump without voltage doubling

In this mode the LCD voltage is stabilized from an un-stabilized supply voltage charging the capacitor

to the LCD voltage. The supply voltage may not drop below 2 V in this mode.

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