PCF8811USLASH2DASLASH1 datasheet(39/73 Pages) PHILIPS

39 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

13.10.1 BASIC COMMAND SET

The VLCD at T = TCUT in the basic command set is

determined by the conversion in the ROM look-up table

with the programmed values of VPR[5:0] and VOFF[2:0].

It can, additionally, be adjusted with the VLCD offset pads

VOS[4:0] to obtain the optimum optical performance.

Instead of using the VLCD offset pads (VOP[4:0]) the VLCD

can be adjusted with the module maker calibration setting

MMVOPCAL[4:0]; see Chapter 22.

(4)

Where:

• T

CUT is a reference temperature; see Section 13.11

• a is a fixed constant value; see Table 22

• b is a fixed constant value; see Table 22

• V

OP[7:0] is the result of the conversion table

• V

OS[4:0]/MMVOPCAL[4:0] is the value of the offset VLCD

offset pads or the value stored in the OTP cells.

Table 22 Parameters of VLCD for the basic and extended

command set

13.10.2 EXTENDED COMMAND SET

The VLCD at T = TCUT can be calculated with equation (5).

In the extended command set VPR[7:0] is the same value

as VOP[7:0]. It can additionally be adjusted with the VLCD

offset pads VOS[4:0] to obtain the optimum optical

performance.

Instead of using the VLCD offset pads (VOP[4:0]) the VLCD

can be adjusted with the module maker calibration setting

MMVOPCAL[4:0]; see Chapter 22.

(5)

Where:

• T

CUT is a reference temperature (see Section 13.11)

• a is a fixed constant value (see Table 22)

• b is a fixed constant value (see Table 22)

• V

PR[7:0] is the programmed VOP value

• V

OS[4:0]/MMVOPCAL[4:0] is the value of the offset VLCD

offset pads or the value stored in the OTP cells.

As the programming range for the internally generated

VLCD allows values above the maximum allowed VLCD

(9 V) the user has to ensure while setting the VPR register

and selecting the Temperature Compensation (TC), that

under all conditions and including all tolerances the VLCD

remains below 9.0 V. This is valid for the two different

command sets.

SYMBOL

VALUE

UNIT

TCUT

°C

0.03

LCD TT

CUT

()

OS [4:0]

OP [7:0]

() b

LCD TT

CUT

()

OS [4:0]

PR [7:0]

() b

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