pcf8814 NXP Semiconductors, pcf8814 Datasheet - Page 58

• Manufacturer Part Number: pcf8814
• Description: Pcf8814 65 X 96 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
17.7
Programming is achieved whilst in CALMM mode and with
the application of the programming voltages. As already
stated, 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
un-programmed. A programmed cell, that is an OTP cell
containing a logic 1, must not be re-programmed.
During programming a substantial current flows in the
V
Table 34 Sequence for OTP programming
Note
1. The data for the bits is not in the correct shift register position until all the bits have been sent.
2003 Mar 13
Repeat steps 5 to 38 for each bit that should be programmed to logic 1.
STEP
LCDIN
65
36
37
38
39
1
2
3
4
5
6
7
7
9
:
Programming flow
pad. For this reason, programming only one OTP
96 pixels matrix LCD driver
D/C
0
0
0
0
0
0
0
0
0
0
:
D7
1
1
1
1
1
1
1
1
1
1
:
D6
0
1
1
1
1
1
1
1
1
1
:
D5
1
1
0
0
0
0
0
0
0
0
:
D4
0
1
1
1
1
1
1
1
1
1
:
D3
1
0
1
1
1
1
1
1
1
1
:
D2
1
0
0
0
0
0
0
0
0
0
:
58
D1
1
1
0
0
0
0
0
0
0
1
:
cell at a time is recommended. This is achieved by filling
all but one shift register cells with logic 0s.
Note that the programming specification refers to the
voltages at the chip pads, contact resistance must
therefore be considered by the user.
In Table 34 an example sequence of commands and data
for OTP programming is shown.
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.
Prior to the sequence specified in Table 34, it is assumed
that the PCF8814 has just been reset.
D0
1
1
1
0
0
0
0
0
0
0
:
exit power-down (DON = 1)
wait 5 ms for refresh to take effect
enter CALMM mode and OSE
shift in data. MMVPR[7] is first bit, see note 1
MMVPR[6]
MMVPR[5]
MMVPR[4]
MMVPR[3]
MMVPR[2]
MMVOPCAL[0]
seal bit
apply programming voltage at pads V
and V
Section 17.8
apply external reset or exit CALMM
LCDIN
, as specified in according to
ACTION
Objective specification
PCF8814
OTPPROG