PCA9620 datasheet(11/71 Pages) NXP

11 / 71 page

PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

11 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

7.1.13 Command: write-RAM-data

The write-RAM-data command writes data byte-wise to the RAM. After Power-On Reset

(POR) the RAM content is random and should be brought to a defined status by clearing it

(setting it logic 0).

[1]

For this command bit RS of the control byte has to be set logic 1 (see Table 33 on page 52).

More information about the display RAM can be found in Section 7.9 on page 40.

7.1.14 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 32 on

page 51).

7.1.15 Command: invmode_CPF_ctrl

The invmode_CPF_ctrl command allows changing the drive scheme inversion mode and

the charge pump frequency.

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

display cell. The PCA9620 will compensate 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.

Table 20.

Write-RAM-data - write RAM data command bit description[1]

Bit

Symbol

Value

Description

7 to 0

B[7:0]

00000000 to

11111111

writing data byte-wise to RAM

Table 21.

Temp-read - temperature readout command bit description[1]

For further information, see Table 9 on page 7 and Section 7.4.7 on page 35.

Bit

Symbol

Value

Description

7 to 0

TD[7:0]

00000000 to

11111111

readout representing the digital temperature

Table 22.

Invmode_CPF_ctrl - inversion mode and charge pump frequency prescaler

command bit description

Bit

Symbol

Value

Description

7 to 2

110101

fixed value

set inversion mode

0[1]

line inversion mode

frame inversion mode

CPF

set charge pump oscillator frequency

0[1]

fosc(cp) ~1MHz

1fosc(cp) ~ 500 kHz

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