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
6.2.8 SLEEP_IN
By sending the Sleep_IN command, the PCF8833
immediately enters the Power-down mode, also referred to
as the Sleep mode. In the Sleep mode the output voltages
of all LCD driver pins (rows and columns) are at VSS1
(ground, all pixels are in off state), and the LCD supply
generation circuit and the oscillator are switched off. The
Sleep_IN command does not change the state of the
DISPON/DISPOFF and BSTRON/BSTROFF commands,
but has the same effect as DISPOFF and BSTROFF;
see Table 17.
While in Sleep_IN mode all commands and data can be
sent and will be executed as in the Sleep_OUT state,
except some OTP related commands and temperature
readout related commands. In the Sleep_IN mode no
effect on the display can be seen.
The Sleep_IN mode is exited by command Sleep_OUT;
see Section 6.2.9.
Table 16 Sleep_IN register bits
D/C
7
6
5
4
3
2
1
0
DEFAULT
0
0
0
0
1
0
0
0
0
10H
Table 17 Sleep_IN/OUT and BSTR_ON/OFF combination
BSTER_ON/BSTER_OFF
ON
ON
OFF
OFF
Sleep_IN/Sleep_OUT
ON
OFF
ON
OFF
Booster(1)
ON
OFF
OFF
OFF
Note
1. Booster is the built-in DC-to-DC converter also called voltage multiplier or charge pump.
6.2.9 SLEEP_OUT
This command must be sent to allow the PCF8833 to
power-up (see Fig.4).
DISPON and BSTRON are set with a reset, the PCF8833
will start-up with Sleep_OUT following the built-in start-up
sequence which generates the requested voltages and
switches on the display, unless DISPOFF and/or
BSTROFF was sent after the last reset.
For the effects of possible combinations of commands
Sleep_IN/Sleep_OUT and BSTRON/BSTROFF; see
Table 17.
Figure 4 illustrates the flow when sending the Sleep_OUT
command. The display is only switched on, when the
internally generated voltage VLCD2 is high enough.
This time is self adapting and therefore dependent on
application conditions:
• It is longer for:
– Low VDD2
– Higher resistors in supply wires and/or external
capacitors
– Higher external capacitors
– Higher required VLCD2 voltage.
• Some other conditions, which may affect start-up time
are:
– Partial/full mode
– Selected bias system
– Temperature
– Selected temperature coefficients.
2003 Feb 14
20
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