PCF8813 datasheet(54/72 Pages) PHILIPS

54 / 72 page

2004 Mar 05

Philips Semiconductors

Product speciﬁcation

(67 + 1)

× 102 pixels matrix LCD driver

PCF8813

17.7

Programming ﬂow

Programming is achieved in MM mode and with

application of the programming voltages. Since the data

for programming the OTP cell is contained in the

corresponding shift register cell, the shift register cell must

be loaded with a 1 in order to program the corresponding

OTP cell. If the shift register cell contains a 0, then no

action will take place when the programming voltages are

applied.

Once programmed, an OTP cell cannot be

de-programmed. Also, a previously programmed cell that

is an OTP cell containing a 1 must not be re-programmed.

During programming a substantial current flows in the

VLCDIN pad. For this reason programming only one OTP

cell at a time is recommended. This is achieved by filling

all but one shift register cells with 0.

The programming specification refers to the voltages at

the chip pads, therefore contact resistance must be

considered by the user.

An example of the sequence of commands and data for

OTP programming is given in Table 23. The order for

programming cells is not significant but it is recommended

that the seal bit is programmed last. Once the seal bit has

been programmed it is not possible to re-enter the

MM mode.

It is assumed that the PCF8813 has been reset just before

the programming commences.

Table 23 Example sequence for OTP programming

Note

1. X = don’t care.

STEP

D/CR/W

ACTION

reset

enable OTP by applying a reset

000100000

exit Power-down (PD = 0)

00001001

switch HVgen on/off to force refresh

of shift register

wait 5 ms for refresh to take effect

000100101

re-enter Power-down

(PD =1andH=1)

000011110

enter MM mode

XXXXX

VCAL[4] (the only bit with value of 1)

XXXXX

VCAL[3]

XXXXX

VCAL[2]

XXXXX

VCAL[1]

XXXXX

VCAL[0]

MF[2]

MF[1]

MF[0]

seal bit; remain in CALMM mode

−−−−−−−−−−

apply programming voltage at pads

VOTPPROG and VLCDIN

Repeat steps 6 to 15 for each bit that should be programmed to 1

−−−−−−−−−−

apply external reset

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