PCF8811USLASH2DASLASH1 datasheet(59/73 Pages) PHILIPS

59 / 73 page

2004 May 17

Philips Semiconductors

Product speciﬁcation

× 128 pixels matrix LCD driver

PCF8811

handbook, full pagewidth

MSB

LSB

shifting

direction

MGW765

MMTC[2:0]

SEAL

BIT = 0

MSB

LSB

MMVOPCAL[4:0]

OTP SHIFT REGISTER

Fig.49 Shift register contents after example sequence of Table 25.

22.7

Programming ﬂow

Programming is achieved whilst in CALMM mode and with

the application of the programming voltages. As

mentioned previously, the data for programming the OTP

cell is contained in the corresponding shift register cell.

The shift register cell must be loaded with a logic 1 in order

to program the corresponding OTP cell. If the shift register

cell contains a logic 0, then no action will take place when

the programming voltages are applied.

Once programmed, an OTP cell cannot be

de-programmed. An already programmed cell, i.e. an OTP

cell containing a logic 1, must not be re-programmed.

During programming a substantial current flows in the

VLCDIN pin. For this reason it is recommended to program

only one OTP cell at a time. This is achieved by filling all

but one shift register cells with logic 0.

It should be noted that the programming specification

refers to the voltages at the chip pins, contact resistance

must therefore be considered by the user.

An example sequence of commands and data for OTP

programming is given in Table 26.

The order for programming cells is not significant.

However, it is recommended that the seal bit is

programmed last. Once this bit has been programmed it

will not be possible to re-enter the CALMM mode.

It is assumed that the PCF8811 has just been reset.

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