PCF8811USLASH2DASLASH1 datasheet(70/81 Pages) NXP

70 / 81 page

PCF8811_4

Product data sheet

Rev. 04 — 27 June 2008

70 of 81

NXP Semiconductors

PCF8811

80 x 128 pixels matrix LCD driver

18.1.2 Temperature coefﬁcient selection

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 Table 20 and Table 30.

18.1.3 Seal bit

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.

0 1010

+10

1 0101

−11

0 1011

+11

1 0100

−12

0 1100

+12

1 0011

−13

0 1101

+13

1 0010

−14

0 1110

+14

1 0001

−15

0 1111

+15

1 0000

−16

Fig 51. VLCD calibration

Table 36.

VOS/MMVOPCAL values in two’s complement notation …continued

Binary

Decimal

Binary

Decimal

mgu287

OTP VLCD calibration: 5-bit offset

MMVOPCAL[4:0]

VOP[7:0]

range: 0 to

+255

range

−16 to +15

range

−16 to +15

range 0 to

+255

usable range

+32 to +255

to high voltage

generator

laser trim pins: 5-bit offset

VOS[4:0]

VPR register: 8-bit value

VPR[7:0]

Table 37.

Seal bit deﬁnition

Seal bit

Action

possible to enter calibration mode

calibration mode disabled

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