PCF8535 datasheet(26/52 Pages) PHILIPS

26 / 52 page

1999 Aug 24

Philips Semiconductors

Objective speciﬁcation

× 133 pixel matrix driver

PCF8535

7.16.5

SPECIAL FEATURE COMMAND PAGE

7.16.5.1

State control

Direct mode allows VLCDOUT to be sourced directly from

VDD2. This may be useful in systems where VDD is to be

used for VLCD.

DOF

Display off will turn off all internal analog circuitry that is not

required for temperature measurement.

As a consequence the display will be turned off. This

mode is only required if temperature measurements are

required whilst in power-down mode.

7.16.5.2

Oscillator setting

The internal oscillator may be disabled and the source

clock for the display derived from the OSC pad. It is

important to remember that LCDs are damaged by DC

voltages and that the clock, whether derived internally or

externally, should never be disabled whilst the display is

active. The internal oscillator is switched off during

power-down mode.

When using an external clock and disabling it during

power-down mode will further reduce the standby current.

If it is not possible to disable it externally then it is worth

noting that by selecting the internal clock, which is disabled

during power-down mode, the same effect may be

achieved.

7.16.5.3

COG/TCP

The chip may be mounted on either a glass, foil or tape

carrier package. For these applications, different

organizations of the row pads are required to negate the

necessity of routing under the device. The TRS and BRS

allow for this swapping. The behaviour of both of these bits

is further described in Section 7.15.

7.16.6

INSTRUCTION SET

Table 16 Instruction set

INSTRUCTION

D/CR/W(1)

I2C-BUS COMMAND BYTE

I2C-BUS COMMANDS

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

H[2:0] = XXX; RAM read/write command page

Write data

writes data to display RAM

Read status

returns result of

temperature measurement

NOP

00000000no operation

Default H[2:0]

000001

jump to H[2:0] = 111

H[2:0] = 111; function and RAM command page

Command page

001H2

select command page

Function set

010PD

0power-down control, data

entry mode

RAM page

100XM0 0

set RAM page for X address

Set Y address of

RAM

0100Y3

sets Y address of RAM

≤ Y ≤ 8

Set X address of

RAM

1X6

sets X address of RAM

≤ X ≤ 127

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