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PCF85321 Scheda tecnica(PDF) 33 Page - NXP Semiconductors

Il numero della parte PCF85321
Spiegazioni elettronici  Universal LCD driver for low multiplex rates
PDF  44 Pages
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Produttore elettronici  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF85321 Scheda tecnica(HTML) 33 Page - NXP Semiconductors

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PCF8532_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 1 — 10 February 2009
33 of 44
NXP Semiconductors
PCF8532
Universal LCD driver for low multiplex rates
Alternatively the schematic can be also constructed such that all the devices have OSC
pin connected to VDD and thus an external CLK being provided for the system (all devices
connected to the same external CLK).
A configuration where SYNC is connected but all PCF8532 are using the internal clock
(OSC pin tied to VSS) is not recommended and may lead to display artefacts!
Table 19.
SYNC contact resistance
Number of devices
Maximum contact resistance
2
6000
Ω
3 to 5
2200
Ω
6 to 8
1200
Ω
(1) Is master (OSC connected to VSS).
(2) Is slave (OSC connected to VDD).
Fig 21. Cascaded configuration with two PCF8532’s using the internal clock of the
master
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
SDA
SCL
CLK
OSC
SYNC
160 segment drives
4 backplanes
160/80/40
segment drives
LCD PANEL
(up to 2560
elements)
PCF8532
(1)
A0
A1
SA0
VSS
VSS
VSS
VDD
VDD
VLCD
VLCD
VDD
VLCD
001aah855
SDA
SDAACK
SDAACK
SCL
SYNC
CLK
OSC
BP0 to BP3
(open-circuit)
A0
A1
SA0
PCF8532
(2)
BP0 to BP3
R
tr
2CB
≤



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