PCF8813 View Datasheet(PDF) - Philips Electronics

Part Name

Description

MFG CO.

PCF8813

(67 + 1) × 102 pixels matrix LCD driver

Philips Electronics 

Prev 41 42 43 44 45 46 47 48 49 50 Next

Philips Semiconductors

(67 + 1) × 102 pixels matrix LCD driver

Product specification

PCF8813

Table 19 VCAL codes and associated nominal calibration

voltage when the temperature coefficient is set

to TC3

VCAL

+0

+1

+2

+3

+4

+5

+6

+7

+8

+9

+10

+11

+12

+13

+14

+15

−1

−2

−3

−4

−5

−6

−7

−8

−9

−10

−11

−12

−13

−14

−15

−16

VCAL[4:0]

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

11111

11110

11101

11100

11011

11010

11001

11000

10111

10110

10101

10100

10011

10010

10001

10000

VLCD

CALIBRATION

(mV)

0 (default)

+25.6

+51.2

+76.8

+102.4

+128.0

+153.6

+179.2

+204.8

+230.4

+256.0

+281.6

+307.2

+332.8

+358.4

+384.0

−25.6

−51.2

−76.8

−102.4

−128.0

−153.6

−179.2

−204.8

−230.4

−256.0

−281.6

−307.2

−332.8

−358.4

−384.0

−409.6

17.2 Manufacturer identity

The second OTP feature defines the manufacturer

identity. A 3-bit code MF[2:0] is used to define this

parameter. The default manufacturer identity is

MF[2:0] = 000.

17.3 Seal bit

Module maker programming is performed in a special

mode; the calibration mode MM. This mode is entered via

the interface command, MM. To prevent wrongful

programming, a seal bit prevents the device from entering

the calibration mode. This seal bit, once programmed,

cannot be reversed, thus further changes in programmed

values are not possible. However it is possible to disable

all programmed values by applying the disable OTP

command.

Applying the programming voltages when not in MM mode

will have no effect on the programmed values.

Table 20 Seal bit definition

SEAL BIT

0

1

ACTION

possible to enter calibration mode

calibration mode disabled

17.4 One time programming

17.4.1 ARCHITECTURE

The OTP circuitry in the PCF8813 contains nine bits of

data: five for VLCD calibration, three for the manufacturer

identity and one for the seal bit. The circuitry for 1-bit is

called an OTP slice. Each OTP slice consists of two main

parts: the OTP cell (a non-volatile memory cell) and the

shift register cell (a flip-flop). The OTP cells are accessible

only through their shift register cells; both reading-from

and writing-to the OTP cells are performed with the shift

register cells, but only the shift register cells are visible to

the rest of the circuit. The basic OTP architecture is shown

in Fig.48.

2004 Mar 05

50

Share Link: