pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 20

• Manufacturer Part Number: pcf8833
• Description: Stn Rgb - 132 X 132 X 3 Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.2.8
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 V
(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.
Table 16 Sleep_IN register bits
Table 17 Sleep_IN/OUT and BSTR_ON/OFF combination
Note
1. Booster is the built-in DC-to-DC converter also called voltage multiplier or charge pump.
6.2.9
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 V
2003 Feb 14
STN RGB - 132
D/C
0
BSTER_ON/BSTER_OFF
S
S
LEEP
LEEP
_IN
_OUT
7
0
OFF
OFF
ON
ON
6
0
LCD2
132
is high enough.
3 driver
5
0
Sleep_IN/Sleep_OUT
SS1
4
1
OFF
OFF
ON
ON
20
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.
This time is self adapting and therefore dependent on
application conditions:
It is longer for:
– Low V
– Higher resistors in supply wires and/or external
– Higher external capacitors
– Higher required V
Some other conditions, which may affect start-up time
are:
– Partial/full mode
– Selected bias system
– Temperature
– Selected temperature coefficients.
3
0
capacitors
DD2
2
0
LCD2
1
0
voltage.
Booster
Objective specification
OFF
OFF
OFF
ON
0
0
PCF8833
(1)
DEFAULT
10H