PCF88331 datasheet(20/112 Pages) PHILIPS

20 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

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

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.

D/C

76543210

DEFAULT

000010000

10H

BSTER_ON/BSTER_OFF

Sleep_IN/Sleep_OUT

Booster(1)

OFF

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.

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