pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 59
pcf8833
Manufacturer Part Number
pcf8833
Description
Stn Rgb - 132 X 132 X 3 Driver
Manufacturer
NXP Semiconductors
Datasheet
1.PCF8833.pdf
(112 pages)
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Philips Semiconductors
6.2.44
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:
Temperature measurements are started automatically
every ten seconds when the digital temperature
compensation is active (default).
Table 72 Temperature readback register bits
Table 73 Temperature readback data format
6.2.45
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
2003 Feb 14
T
(S)DIN
(S)DOUT
0000 0000
0000 0001
0000 0010
:
SYMBOL
STN RGB - 132
=
D/C
D/C
0
0
1
0.9375
NLI[7:0]
T
N-
EMPERATURE READBACK
LINE INVERSION
D/C
TD 40
NLI
0
7
1
7
1
–
7
TD[7]
no N-line inversion (super frame inversion)
inversion after 4 rows in full Display mode or 1 row in Partial mode
inversion after 8 rows in full Display mode or 2 rows in Partial mode
:
C
7
1
NLI
6
1
6
1
132
6
TD[6]
6
1
3 driver
NLI
5
0
5
0
5
TD[5]
5
0
NLI
4
1
4
0
(12)
4
TD[4]
59
4
1
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.
NLI
DESCRIPTION
3
1
3
1
3
TD[3]
3
1
NLI
2
0
2
0
TD[2]
2
2
0
NLI
TD[1]
1
0
1
0
1
0
1
Objective specification
TD[0]
NLI
0
1
0
0
0
0
0
PCF8833
DEFAULT
DEFAULT
DEFAULT
C8H
C9H
13H
C8H
XX
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