PCF8833 View Datasheet(PDF) - Philips Electronics
Part Name
Description
MFG CO.
'PCF8833' PDF : 112 Pages View PDF
Philips Semiconductors
STN RGB - 132 × 132 × 3 driver
Objective speciï¬cation
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
7
6
5
4
3
2
1
0
DEFAULT
0
0
0
0
0
0
0
0
1
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
7
6
5
4
3
2
1
0
DEFAULT
0
0
0
0
0
0
0
1
0
02H
handbook, halfpage
start
send DISPOFF (28H)
send BSTROFF (02H)
end
MGU911
Fig.2 Booster voltage off flow chart.
2003 Feb 14
15
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