OM6211 NXP Semiconductors, OM6211 Datasheet - Page 28

• Manufacturer Part Number: OM6211
• Description: 48 X 84 Dot Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
18 MODULE MAKER PROGRAMMING
The One Time Programmable (OTP) technology has been
implemented on the OM6211. It enables the module
maker to program some extended features of the OM6211
after it has been assembled on an LCD module.
Programming is made under the control of the serial
interface and the use of one special pin. This pin must be
made available on the module glass but needs not to be
accessed by the set maker.
As the module maker programming is an extension of the
normal functions of the OM6211 it will not be effective until
specifically instructed with the ‘Enable OTP’ command.
The OM6211 features 3 module maker programmable
parameters:
18.1
The first feature included is the ability to tune the V
voltage with a 5-bit code. This code is implemented in
two’s complement notation giving rise to a positive or
negative offset to the V
2002 Jan 17
handbook, full pagewidth
V
V
Seal bit.
48
LCD
PR
default value
V
calibration
LCD
84 dot matrix LCD driver
calibration
MMVOPCAL [ 4:0 ]
V OS [ 4:0 ]
V PR [ 7:0 ]
OTP V LCD calibration: 5-bit offset
laser trim pins: 5-bit offset
V PR register: 8-bit value
PR
register.
range 16 to 15
range 16 to 15
range 0 to 255
usable range 32 to 255
Fig.20 V
LCD
LCD
28
calibration.
This is in the same manner as the on-glass calibration pins
V
but it is recommended that the laser trim pins are tied to
V
to a default offset of zero. If both are used then the addition
of the two 5-bit numbers must not exceed a 5-bit result
otherwise the resultant value will be undefined. The final
adder in the circuit has underflow and overflow protection.
In the event of an overflow, the output will be clamped
to 255; and during an underflow the output will be clamped
to 0.
The final control to the high voltage generator, V
the sum of all the calibration registers and pins. The V
equation (1) given in Section 9.12 must be extended to
include the OTP calibration.
The additional offset applied to V
from equation (2) and (5), where b is the step size as
defined in Table 4.
The possible MMVOPCAL
the same as the V
V
V
OS
SS
OP
LCD
when OTP calibration is being used. This will set them
(laser trim pins). In theory, both may be used together
OFFSET
=
V
PR
+
V
=
OS
OS
V
+
V OP [7:0]
range: 0 to 255
OS
[4:0] values, see Table 9.
MMVOPCAL
+
MMVOPCAL
4
to MMVOPCAL
LCD
to high voltage
generator
Product specification
can be calculated
MGU287
b
OM6211
0
values are
OP
, will be
OP
(5)
(6)