PCA9620 datasheet(12/71 Pages) NXP

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PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

12 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

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.

The waveforms of Figure 15 on page 23 to Figure 21 on page 29 are showing line

inversion mode. Figure 22 on page 30 shows one example of frame inversion.

7.1.16 Command: temp-filter

[1]

Default value.

7.2 Possible display configurations

The PCA9620 is a versatile peripheral device designed to interface between any

microprocessor or microcontroller to a wide variety of LCD segment or dot matrix displays

(see Figure 3). It can directly drive any static or multiplexed LCD containing up to eight

backplanes and up to 60 segments.

The display configurations possible with the PCA9620 depend on the number of active

backplane outputs required; a selection of possible display configurations is given in

Table 24.

Table 23.

Temp-filter - digital temperature filter command bit description

Bit

Symbol

Value

Description

7 to 1

1101001

fixed value

TFE

digital temperature filter switch

0[1]

digital temperature filter disabled;

the unfiltered digital value of TD[7:0] is

immediately available for the readout and

VLCD compensation, see Section 7.4.7 on

page 35

digital temperature filter enabled

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