PCF88331 datasheet(15/112 Pages) PHILIPS

15 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.3

SOFTWARE RESET

The software reset (SWRESET) has exactly the same effect as the hardware reset; see Section 6.2.2.

After sending SWRESET any command can be sent immediately without any additional delay in between, for instance:

Sleep_OUT, BSTRON and DISPON, etc.

Table 5

Software reset register bits

D/C

76543210

DEFAULT

000000001

01H

6.2.4

BOOSTER VOLTAGE OFF

The DC-to-DC converters are turned off and pins

VLCDOUT1 and VLCDOUT2 become 3-state.

In order to avoid any optical effect on the display, the

sequence given in Fig.2 must be used before the internal

display supply generation circuits are turned off.

The external LCD supply input voltages (VLCDIN1 and

VLCDIN2) can be applied while the display voltage

generation (BSTROFF) is off. When BSTROFF, DISPON

and Sleep_OUT are set, the external LCD supply input

voltages (VLCDIN1 and VLCDIN2) must be applied, otherwise

the display outputs will be undefined.

Command Sleep_IN does not effect the setting of

BSTRON/BSTROFF or DISPON/DISPOFF, but switches

off the DC-to-DC converter (booster) and ties the display

outputs to VSS1.

For the effect of possible combinations of commands

Sleep_IN/Sleep_OUT and BSTRON/BSTROFF; see

Table 17 and Fig.4. Figure 7 shows the effects of the

combination of commands BSTRON and BSTROFF with

DISPON and DISPOFF.

Table 6

Booster voltage off register bits

D/C

76543210

DEFAULT

000000010

02H

handbook, halfpage

MGU911

send DISPOFF (28H)

start

end

send BSTROFF (02H)

Fig.2 Booster voltage off flow chart.

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