pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 52

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

Philips Semiconductors
17 MODULE MAKER PROGRAMMING
One Time Programmable (OTP) technology has been
implemented on the PCF8814. It enables the module
maker to program some extended features of the
PCF8814 after it has been assembled on an LCD module.
Programming is made under the control of the interfaces
and the use of one special pad. This pad must be made
available on the module glass but needs not to be
accessed by the set maker.
The PCF8814 features 6 module maker programmable
parameters:
17.1
The LCD voltage (V
(MMVOPCAL[5:0]). This code is implemented in twos
complement notation giving rise to a positive or negative
offset to the V
2003 Mar 13
handbook, full pagewidth
V
Default temperature compensation slopes
Default charge pump multiplication factor
Default V
Default bias system
n-line inversion control
Enable factory defaults
Seal bit.
65
LCD
LCD voltage calibration
calibration
96 pixels matrix LCD driver
PR
PR
value
register.
MMVOPCAL [ 5:0 ]
V PR [ 7:0 ]
LCD
V LCD calibration: 6-bit offset
) can be tuned with a 6-bit code
V PR register: 8-bit value
Fig.50 V
0 to 255
(usable range 32 to 244)
32 to 31
LCD
52
calibration.
The adder in the circuit has underflow and overflow
protection. In the event of an overflow, the output will be
clamped to 255; whilst during an underflow the output will
be clamped to 0.
Examples of possible MMVOPCAL codes are given in
Table 28.
Table 28 Possible MMVOPCAL codes
MMVOPCAL[5:0]
011111
011110
011101
000010
000001
000000
111111
111110
100010
100001
100000
:
:
V OP [7:0]
0 to 25
EQUIVALENT
DECIMAL
31
30
29
2
1
0
30
31
32
:
:
1
2
to high voltage
generator
MBL592
Objective specification
V
PCF8814
LCD
+930
+900
+870
(mV)
+60
+30
OFFSET
900
930
960
0
30
60
:
: