pcf8833 NXP Semiconductors, pcf8833 Datasheet - Page 54

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

Philips Semiconductors
Temperature compensation is implemented by adding an
offset to the V
was calculated by adding V
settings together. Now, an additional offset V
The final result for V
number. Care must be taken by the user to ensure that the
ranges of V
compensation do not cause clipping, and hence undesired
results (see Fig.24). The adders will not permit overflow or
underflow and will clamp results to either end of the range
(V
The temperature readout generates an 8-bit result TD[7:0].
This temperature readout number is used for temperature
compensation.
2003 Feb 14
handbook, full pagewidth
40 to +79 C will be clamped to the last valid offset.
OP
STN RGB - 132
= 0 or 445). Also, temperatures outside the range
TEMPERATURE
READOUT
PR
OP
, MMVOPCAL, VCON and temperature
value. Previously, in Section 6.2.31, V
LCD
calculation is a 9-bit positive
TD
PR
8
, VCON and MMVOPCAL
132
Fig.30 Segmented temperature compensation.
40
SLA
3 driver
SLB
0
T
is added.
V PR [ 8:0 ]
SLC
offset
zero
OP
VCON [ 5:0 ]
SLD
54
80
The resolution of the readout is
( 40 to +80 C)/128 = 0.9375 C/LSB; where 0
represents 40 C and 127 represents +79 C;
see Section 6.2.44.
The temperature readout function can also be used to read
back the temperature value via the interface;
see equation (12).
The offset value may be calculated from Table 67. The
effect on V
value with the value of b.
For example T = 8 C: TD = 34 and MB = 0.5:
V
A complete overview of the programming range of V
can be found in Section 15.1.
LCD(OS)
T ( C)
MMVOPCAL [ 5:0 ]
V OP [ 8:0 ]
= 40 mV
OFFSET
LCD
V T
can be calculated by multiplying the offset
8
(64
9
34)
b
0.5 = 600 mV.
Objective specification
a
PCF8833
MGU939
V LCD
LCD