PCF8811U/2DA/1 NXP [NXP Semiconductors], PCF8811U/2DA/1 Datasheet - Page 70

• Manufacturer Part Number: PCF8811U/2DA/1
• Description: 80 x 128 pixels matrix LCD driver
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8811_4
Product data sheet
18.1.2 Temperature coefficient selection
18.1.3 Seal bit
Table 36.
The second feature is an OTP factory default setting for the temperature coefficient
selection (MMTC) in the basic command set. This 3-bit value will be loaded from OTP
after leaving the Power-save mode or by the Refresh command. The idea of this feature is
to provide, in the basic command set, the complete set of temperature coefficients without
an additional command. In the extended command set the temperature coefficient can be
programmed as given in
The module maker programming is performed in a special mode: the calibration mode
(CALMM). This mode is entered via a special interface command, CALMM. To prevent
unwanted programming, a seal bit has been implemented which prevents the device from
entering the calibration mode. This seal bit, once programmed, cannot be reversed so
further changes in programmed values are not possible.
Applying the programming voltages when not in CALMM mode has no effect on the
programmed values.
Table 37.
Binary
0 1010
0 1011
0 1100
0 1101
0 1110
0 1111
Seal bit
0
1
Fig 51. V
MMVOPCAL [ 4:0 ]
V
V
OS
PR
OTP V
[ 4:0 ]
[ 7:0 ]
laser trim pins: 5-bit offset
V PR register: 8-bit value
LCD
V
LCD
Seal bit definition
OS
calibration: 5-bit offset
/MMVOPCAL values in two’s complement notation
calibration
Action
possible to enter calibration mode
calibration mode disabled
Decimal
+10
+11
+12
+13
+14
+15
Rev. 04 — 27 June 2008
Table 20
range 16 to 15
range 16 to 15
range 0 to 255
usable range 32 to 255
and
Table
30.
Binary
1 0101
1 0100
1 0011
1 0010
1 0001
1 0000
80 x 128 pixels matrix LCD driver
V
range: 0 to 255
…continued
OP
[7:0]
Decimal
11
12
13
14
15
16
PCF8811
© NXP B.V. 2008. All rights reserved.
to high voltage
generator
mgu287
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