PCF8537 datasheet(15/82 Pages) NXP

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PCF8537

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Product data sheet

Rev. 1 — 31 May 2012

15 of 82

NXP Semiconductors

PCF8537

Industrial LCD driver for multiplex rates up to 1:8

8.1.15 Command: Temp-read

The Temp-read command allows reading out the temperature values measured by the

internal temperature sensor.

[1]

For this command, bit R/W of the I2C-bus slave address byte has to be set logic 1 (see Table 31).

8.1.16 Command: Invmode_ctrl

The Invmode_ctrl command allows changing the drive scheme inversion mode.

The waveforms used to drive LCD displays inherently produce a DC voltage across the

display cell. The PCF8537 compensates for the DC voltage by inverting the waveforms on

alternate frames or alternate lines. The choice of compensation method is determined

with the LF bit.

[1]

Default value.

In frame inversion mode, the DC value is compensated across two frames and not within

one frame. Changing the inversion mode to frame inversion reduces the power

consumption, therefore it is useful when power consumption is a key point in the

application.

Frame inversion may not be suitable for all applications. The RMS voltage across a

segment is better defined, however since the switching frequency is reduced there is

possibility for flicker to occur.

Figure 24 on page 34 to Figure 30 on page 40 are showing the waveforms in line

inversion mode. Figure 31 on page 41 shows an example of frame inversion.

Table 20.

Temp-read - temperature readout command bit description

For further information, see Section 8.4.4 on page 28.

Bit

Symbol

Binary value

Description

7 to 0

TD[7:0]

00000000 to

11111111

digital temperature values[1]

Table 21.

Invmode_ctrl - drive scheme inversion command bit description

For further information, see Section 8.4.6 on page 34.

Bit

Symbol

Binary value

Description

7 to 2

110101

fixed value

1LF

set inversion mode

0[1]

driving scheme A: line inversion mode

driving scheme B: frame inversion mode

fixed value

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