PCA8537(2012) 查看數據表（PDF） - NXP Semiconductors.

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PCA8537
(Rev.:2012)

Automotive LCD driver for multiplex rates up to 1:8

NXP Semiconductors. 

NXP Semiconductors

PCA8537

Automotive 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.

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

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.

Table 6. OTP-refresh - OTP-refresh command bit description

Bit

Symbol

Binary value Description

7 to 0 -

1101 0000

fixed value

8.1.3 Command: Oscillator-ctrl

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

enables or disables the pin CLK.

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 -

1100 11

fixed value

1

COE

control pin CLK

0[1]

clock signal not available on pin CLK;

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

1

clock signal available on pin CLK

0

OSC

oscillator source

0[1]

internal oscillator used

1

external oscillator used;

pin CLK becomes an input

[1] Default value.

8.1.3.1 Oscillator

The internal logic and LCD drive signals of the PCA8537 are timed either by the built-in

oscillator or from an external clock.

PCA8537

Product data sheet

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

Rev. 1 — 31 May 2012

© NXP B.V. 2012. All rights reserved.

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