PCF88331 datasheet(59/112 Pages) PHILIPS

59 / 112 page

2003 Feb 14

Philips Semiconductors

Objective speciﬁcation

STN RGB - 132

× 132 × 3 driver

PCF8833

6.2.44

TEMPERATURE READBACK

The PCF8833 has a built-in temperature readback

(RDTEMP) measurement device. The measured value is

provided as an 8-bit digital value TD[7:0] which can be

read back via the interface.

The temperature can be determined from TD[7:0] using

the following formula:

(12)

Temperature measurements are started automatically

every ten seconds when the digital temperature

compensation is active (default).

A measurement can be initiated by sending the instruction

to set TCVOPE (to either logic 1 or logic 0), irrespective of

whether temperature compensation is disabled or not.

After initialization, the measurement will take

approximately 5 ms to complete. It is recommended to

read the register twice to qualify the returned result,

especially if the measurement is triggered automatically.

The input and output data format for the temperature

readback is given in Table 73.

0.9375

–

()°C

Table 72 Temperature readback register bits

Table 73 Temperature readback data format

6.2.45

N-LINE INVERSION

The N-line inversion (NLI) command inverts the row functions after N-line row time slots in order to avoid a DC

component on the LCD display. Thus, when N-line is set to 19DEC inversion of the row functions will occur after 76 rows.

With FINV = 1 (see Section 6.2.34) the super-frame inversion is active and the NLI counter always starts at super-frame

start.

When FINV = 0 a DC voltage may remain on the display depending on the NLI setting. When FINV = 0 and NLI = 0 there

is no inversion, which results in a DC voltage on the display.

Table 74 N-line inversion register bits

Table 75 N-line inversion

D/C

76543210

DEFAULT

011011000

C8H

SYMBOL

D/C

76543210

DEFAULT

(S)DIN

011011000

C8H

(S)DOUT

−

TD[7]

TD[6]

TD[5]

TD[4]

TD[3]

TD[2]

TD[1]

TD[0]

D/C

76543210

DEFAULT

11001001

C9H

NLI7

NLI6

NLI5

NLI4

NLI3

NLI2

NLI1

NLI0

13H

NLI[7:0]

DESCRIPTION

0000 0000

no N-line inversion (super frame inversion)

0000 0001

inversion after 4 rows in full Display mode or 1 row in Partial mode

0000 0010

inversion after 8 rows in full Display mode or 2 rows in Partial mode

PCF88331 Datasheet(PDF) 59 Page - NXP Semiconductors

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