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PCA9620 датащи(PDF) 16 Page - NXP Semiconductors

номер детали PCA9620
подробное описание детали  Universal LCD driver for low multiplex rates
PDF  71 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9620 датащи(HTML) 16 Page - NXP Semiconductors

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PCA9620
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 1 — 9 December 2010
16 of 71
NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
7.3.2 Recommended start-up sequences
This chapter describes how to proceed with the initialization of the chip in different
application modes.
(1) This time depends on the external capacitor on pin VLCD. For a capacitor of 100 nF a delay of 5 ms
to 15 ms is expected.
When using the internal VLCD generation, the display must not be enabled before the generation of
VLCD with the internal charge pump is completed, otherwise unwanted display artifacts may appear
on the display.
(2) RAM data may be written before or during the ramp-up of VLCD.
Fig 6.
Recommended start-up sequence when using the internal charge pump and the
internal clock signal
Wait 1 ms
START
Power-on
VDD1 and
VDD2 at the
same time
013aaa249
Set VPR
register to
desired VLCD
value
Set
multiplication
factor for
charge pump
and enable it
Wait till
VLCD reaches
programmed
value(1)
Write RAM
content to be
displayed and
enable the
display(2)
STOP
Initiate an
OTP-refresh
Initialize
command



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