PCF8537 datasheet(8/82 Pages) NXP

8 / 82 page

PCF8537

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

Product data sheet

Rev. 1 — 31 May 2012

8 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.1.1 Command: Initialize

This command generates a chip-wide reset which resets all command values to their

default values. After this command is sent, it is possible to send additional commands

without the need to re-initialize the interface. The reset takes 100 ns to complete.

8.1.2 Command: OTP-refresh

During production and testing of the device, each IC is calibrated to achieve the specified

accuracy of VLCD, the frame frequency, and the temperature measurement. This

calibration is performed on EPROM cells called One Time Programmable (OTP) cells.

The device reads these cells every time at power-on, after a reset, and every time when

the initialize command or the OTP-refresh command is sent.

Remark: It is recommended not to enter power-down mode during the OTP refresh cycle.

8.1.3 Command: Oscillator-ctrl

The Oscillator-ctrl command switches between internal and external oscillator and

enables or disables the pin CLK.

[1]

Default value.

8.1.3.1

Oscillator

The internal logic and LCD drive signals of the PCF8537 are timed either by the built-in

oscillator or from an external clock.

Table 5.

Initialize - initialize command bit description

For further information, see Section 8.2 on page 17.

Bit

Symbol

Binary value

Description

7 to 0

00111010

fixed value

Table 6.

OTP-refresh - OTP-refresh command bit description

Bit

Symbol

Binary value

Description

7 to 0

11010000

fixed value

Table 7.

Oscillator-ctrl - oscillator control command bit description

For further information, see Section 8.1.3.1.

Bit

Symbol

Binary value

Description

7 to 2

110011

fixed value

1COE

control pin CLK

0[1]

clock signal not available on pin CLK;

pin CLK is in 3-state and may be left floating

clock signal available on pin CLK

0OSC

oscillator source

0[1]

internal oscillator used

external oscillator used;

pin CLK becomes an input

PCF8537 датащи(PDF) 8 Page - NXP Semiconductors

PCF8537 датащи(HTML) 8 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 69 70 71 72 73 74 75 76 77 78 79 80 81 82

датащи скачать

ссылки URL