PS081 datasheet(61/155 Pages) AMSCO

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4-4

PSØ81

4.2.2

LCD-Power supply

The PSØ81 has an integrated charge pump to double and stabilize the voltage for driving 3 V and

2.5 V LCD displays. 2 V displays need no voltage doubling. The choice for the external capacitors

depends on the size or capacitance of the display.

Configuration:

lcd_standby

The display has a stand-by mode. I this mode the display is switched off, but

the voltage generation is switched high resistive. So it is possible to switch on

the display very fast. This might be helpful in auto-on mode.

= 0

LDC on

= 1

Standby

lcd_vlt[1:0]

Selection of LCD supply voltage

= 0

2.0 V

= 1

2.5 V

= 2

3.0 V

= 3

2.0 V without voltage doubling

lcd_directdrive

LCD direct drive selection

= 0

off

= 1

LCD is driven directly from Vcc without regulation and charge pump.

This reduces the LCD current and should be used in solar applications.

lcd_dis_chargm

1 =

Suppresses the recharging of the charge pump capacitors during a

measurement.

This option is reasonable only in stretched modes (here

it is recommended) and single conversion mode (at low internal avera-

ging (avrate < 10), the time between measurements must be sufficient

to recharge the capacitors, duty 1:3).

This option works only in combination with a pulsed 4 MHz oscillator

use_10kHz_lcd

1 =

Select the low power 10 kHz oscillator for the LCD charge pump.

1 = recommended

0 =

Charge pump clock derived from 4 MHz, divider can be set in the ran-

ge 480 to 512. The selection avoids a fixed relation between charge

pump and measurement and therefore reduced distortions of the mea-

surement.

c10_div_lcd[5:0]

5 bit divider factor for deriving the 10kHz from the 4 MHz in continuous

mode.

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