PCA9620H NXP [NXP Semiconductors], PCA9620H Datasheet - Page 11

• Manufacturer Part Number: PCA9620H
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9620
Product data sheet
7.1.13 Command: write-RAM-data
7.1.14 Command: temp-read
7.1.15 Command: invmode_CPF_ctrl
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).
Table 20.
[1]
More information about the display RAM can be found in
The temp-read command allows reading out the temperature values measured by the
internal temperature sensor.
Table 21.
For further information, see
[1]
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.
Table 22.
[1]
Bit
7 to 0
Bit
7 to 0
Bit
7 to 2
1
0
For this command bit RS of the control byte has to be set logic 1 (see
For this command bit R/W of the I
page
Default value.
Symbol
B[7:0]
Symbol
TD[7:0]
51).
Symbol
-
LF
CPF
Write-RAM-data - write RAM data command bit description
Temp-read - temperature readout command bit description
Invmode_CPF_ctrl - inversion mode and charge pump frequency prescaler
command bit description
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 9 December 2010
Table 9 on page 7
Value
00000000 to
11111111
Value
00000000 to
11111111
Value
110101
0
1
0
1
2
[1]
[1]
C-bus slave address byte has to be set logic 1 (see
and
Universal LCD driver for low multiplex rates
Description
writing data byte-wise to RAM
Description
readout representing the digital temperature
Description
fixed value
set inversion mode
set charge pump oscillator frequency
Section 7.4.7 on page
line inversion mode
frame inversion mode
f
f
osc(cp)
osc(cp)
~ 1 MHz
~ 500 kHz
Section 7.9 on page
Table 33 on page
35.
[1]
[1]
PCA9620
© NXP B.V. 2010. All rights reserved.
Table 32 on
52).
40.
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