pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 53

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

Philips Semiconductors
17.2
In some instances it is desirable that the configuration is
derived from OTP cells and not from user configurable
registers. It is possible to pre-define the following features:
The selection of the factory defaults mode is made by
setting the factory default OTP cell, as shown in Table 29.
The operation can be thought of as a switch that selects
between two sources for the data; see Fig.51. When the
factory defaults are selected, changing the values via the
interface is not possible (the register contents are updated,
but have no effect).
Table 29 Factory default bit
17.2.1
The values for SLA[2:0], SLB[2:0], SLC[2:0] and SLD[2:0]
can be pre-defined.
2003 Mar 13
handbook, full pagewidth
DEFAULT BIT
Default temperature compensation slopes
Default charge pump multiplication factor
Default V
Default bias system
n-line inversion control.
65
Factory defaults
0
1
D
96 pixels matrix LCD driver
EFAULT TEMPERATURE SLOPE SELECTION
PR
value
configuration data is taken from the
interface
OTP values are used for configuration
INTERFACE
ACTION
OTP DEFAULTS
e.g. SLA [2:0]
e.g. SLA [2:0]
REGISTERS
INTERFACE
Fig.51 Factory defaults.
53
0
1
17.2.2
The value for S[1:0] can be pre-defined.
17.2.3
The value for V
17.2.4
The value for BS[2:0] can be pre-defined.
17.3
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 wrongful programming, a seal bit has been
implemented which prevents the device from entering the
calibration mode. This seal bit, once programmed, cannot
be reversed, thus further changes in programmed values
are not possible. Applying the programming voltages when
not in CALMM mode will have no effect on the
programmed values.
Table 30 Seal bit definition
SEAL BIT
FACTORY
DEFAULT
Seal bit
0
1
D
D
D
EFAULT CHARGE PUMP MULTIPLICATION FACTOR
EFAULT
EFAULT BIAS VALUE
PR
to temperature
compensation
circuit
[7:0] can be pre-defined.
V
possible to enter calibration mode
calibration mode disabled
PR
MBL593
VALUE
ACTION
Objective specification
PCF8814