PCF8545 datasheet(10/68 Pages) NXP

10 / 68 page

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

Effect of setting PD

Effect on function

Mode settings

backplane output

E = 1

normal function

VSS

segment output

E = 1

normal function

VSS

internal oscillator

OSC = 0, COE = 1

off

OSCCLK pin

OSC = 0, COE = 1

output of internal

oscillator frequency

VDD

OSCCLK pin

OSC = 1

input clock

clock input, can be

logic 0, logic 1, or left

floating

Table 8. Effect of the power-down bit (PD)

With the following sequence, the PCF8545 can be set to a state of minimum power

consumption, called power-down mode.

START

Disable display

by setting bit E

logic 0

External clock

can be

removed now

013aaa447

Enable power-

down mode

with PD = 1

STOP

Figure 6. Recommended power-down sequence

Remarks:

• It is necessary to run the power-down sequence before removing the supplies.

Depending on the application, care must be taken that no other signals are present at

the chip input or output pins when removing the supplies (see Section 9). Otherwise

it may cause unwanted display artifacts. If an uncontrolled removal of the supply

happens, the PCF8545 does not get damaged.

• Static voltages across the liquid crystal display can build up when the external LCD

supply voltage (VLCD) is on while the IC supply voltage is off, or the other way around.

This may cause unwanted display artifacts. To avoid such artifacts, VLCD and VDD must

be applied or removed together.

• A clock signal must always be supplied to the device when the display is active.

Removing the clock may freeze the LCD in a DC state, which is not suitable for the

liquid crystal. First disable the display and afterwards remove the clock signal.

PCF8545

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2 — 4 October 2021

10 / 68

PCF8545 датащи(PDF) 10 Page - NXP Semiconductors

PCF8545 датащи(HTML) 10 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

датащи скачать

ссылки URL