PCF88331 datasheet(51/112 Pages) PHILIPS

51 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

Table 57 Temperature compensated frame frequency reset state

6.2.37

TEMPERATURE COMPENSATED VLCD

The PCF8833 incorporates a temperature segmented VOP programming; see Section 6.2.40. By using the temperature

compensated VLCD (TCVOPE) command the temperature segmented VLCD can be disabled.

The TCVOPE control bit reset state is defined in Table 59.

When the non-segmented VLCD programming is chosen the LCD supply voltage is flat, i.e. no compensation over the

specified temperature range (offset VT in Fig.30 is 0).

The TCVOPE command is also used to read back the temperature via the interface; see Section 6.2.44.

Table 58 Temperature segmented VLCD register bits

Table 59 Temperature segmented VLCD reset state

6.2.38

INTERNAL OR EXTERNAL OSCILLATOR

The Internal/external oscillator (EC) command selects the internal or external oscillator. When an external oscillator is

used the external clock signal has to be connected to the OSC pad; see Section 7.6.

The EC control bit reset state is defined in Table 61.

Table 60 Internal/external oscillator register bits

Table 61 Internal/external oscillator reset state

BIT

LOGIC 0

LOGIC 1 (RESET STATE)

TCDFE

non-segmented frame frequency

segmented frame frequency

D/C

6543210

DEFAULT

TCVOPE

BFH

BIT

LOGIC 0

LOGIC 1 (RESET STATE)

TCVOPE

no temperature compensated VLCD

segmented temperature compensated VLCD

D/C

6543210

DEFAULT

100000

C0H

BIT

LOGIC 0 (RESET STATE)

LOGIC 1

internal oscillator

external clock applied

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