PCA8537 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

PCA8537

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

8.1.15 Command: Temp-read

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

internal temperature sensor.

Table 21. 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 digital temperature values[1]

11111111

[1] For this command, bit R/W of the I2C-bus slave address byte has to be set logic 1 (see Table 32).

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 PCA8537 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.

Table 22. 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 -

1101 01

fixed value

1

LF

set inversion mode

0[1]

driving scheme A: line inversion mode

1

driving scheme B: frame inversion mode

0

-

0

fixed value

[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.

PCA8537

Product data sheet

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

Rev. 2 — 7 April 2015

© NXP Semiconductors N.V. 2015. All rights reserved.

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