pcf8813 NXP Semiconductors, pcf8813 Datasheet - Page 54

• Manufacturer Part Number: pcf8813
• Description: 67 + 1 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
17.7
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
V
Table 23 Example sequence for OTP programming
Note
1. X = don’t care.
2004 Mar 05
STEP
Repeat steps 6 to 15 for each bit that should be programmed to 1
LCDIN
(67 + 1)
10
11
12
13
14
15
15
1
1
3
4
5
6
7
8
9
Programming flow
pad. For this reason programming only one OTP
D/C
0
0
0
0
0
0
0
0
0
0
0
0
0
R/W
0
0
0
0
0
0
0
0
0
0
0
0
0
102 pixels matrix LCD driver
D7
0
0
0
0
1
1
1
1
1
1
1
1
1
D6
0
0
0
0
0
0
0
0
0
0
0
0
1
D5
X
X
X
X
X
X
X
X
X
1
0
1
0
reset
D4
X
X
X
X
X
X
X
X
X
0
1
0
1
D3
X
X
X
X
X
X
X
X
X
0
0
0
1
54
D2
X
X
X
X
X
X
X
X
X
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.
0
0
1
1
D1
X
X
X
X
X
X
X
X
X
0
1
0
1
PC
D0
0
1
0
1
1
1
0
0
0
0
0
0
enable OTP by applying a reset
exit Power-down (PD = 0)
switch HVgen on/off to force refresh
of shift register
wait 5 ms for refresh to take effect
re-enter Power-down
(PD = 1 and H = 1)
enter MM mode
V
V
V
V
V
MF[2]
MF[1]
MF[0]
seal bit; remain in CALMM mode
apply programming voltage at pads
V
apply external reset
CAL
CAL
CAL
CAL
CAL
OTPPROG
[4] (the only bit with value of 1)
[3]
[2]
[1]
[0]
and V
ACTION
LCDIN
Product specification
PCF8813