pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 38

• Manufacturer Part Number: pcf8814
• Description: Pcf8814 65 X 96 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 23 Temperature compensation equations
Temperature compensation is implemented by adding an
offset V
calibration offset MMVOPCAL).
The final result for V
number as shown in equations (1) and (2). Care must be
taken by the user to ensure that the ranges of V
MMVOPCAL and V
undesired results. The adder stages will not permit
overflow or underflow and will clamp results at either end
of the range.
The temperature read-out generates a 7-bit result,
TD[6:0]. For temperatures below 40 C, the value of TD
is zero. For temperatures above 79 C, the value of TD is
higher than 63, but for V
used.
Table 24 N-line inversion
2003 Mar 13
N[4:0]
FI
65
TEMPERATURE RANGE ( C)
PARAMETER
T
to the V
96 pixels matrix LCD driver
40 to 11
10 to 19
20 to 49
50 to 79
PR
T
value (additionally to the OTP
LCD
do not cause clipping and hence
calculation is an 8-bit positive
T
calibration the value TD = 63 is
VALUE
00000
00001
11111
1
0
:
PR
invert every 62 rows
frame inversion ON; N-line counter restarted at every frame
,
invert every 2 rows
no N-line inversion
frame inversion OFF; N-line counter runs continuously
TD RANGE
16 to 31
32 to 47
48 to 63
0 to 15
p = 2
38
:
The offset value V
effect on V
value with the value of b (from Table 21).
For example, if T = 10 C, TD = 16 and MB = 1.25 then
V
11.10 N-line inversion
To improve the optical characteristics of the display, N-line
inversion has been implemented with two options:
LCD(offset)
When frame inversion is ON, N-line inversion is
restarted every frame
When frame inversion is OFF, the N-line inversion
counter runs continuously.
LCD
= 30 mV
can be calculated by multiplying the offset
T
V
V
V
V
may be calculated from Table 23. The
T
T
T
T
(32
=
=
=
=
–
–
16 MB
32 TD
invert every 124 rows
16)
TD 32
16 MC
invert every 4 rows
no N-line inversion
EQUATION
1.25 = 600 mV.
Objective specification
p = 4
+
MB
:
MA
+
MC
MD
PCF8814
16 TD
TD 48
–
–