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PCF8534AHL/1 Folha de dados(PDF) 35 Page - NXP Semiconductors

Nome de Peças PCF8534AHL/1
Descrição Electrónicos  Universal LCD driver for low multiplex rates
PDF  47 Pages
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Fabricante Electrônico  NXP [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8534AHL/1 Folha de dados(HTML) 35 Page - NXP Semiconductors

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PCF8534A_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 6 August 2009
35 of 47
NXP Semiconductors
PCF8534A
Universal LCD driver for low multiplex rates
The contact resistance between the SYNC pins of cascaded devices must be controlled. If
the resistance is too high, the device will not be able to synchronize properly.
Table 19 shows the maximum contact resistance values.
Fig 23. Synchronization of the cascade for various PCF8534A drive modes
Table 19.
SYNC contact resistance
Number of devices
Maximum contact resistance
2
6000
Ω
3 to 5
2200
Ω
6 to 10
1200
Ω
11 to 16
700
Ω
Tfr = f
fr
1
BP0
SYNC
BP0
(1/2 bias)
SYNC
BP0
(1/3 bias)
(a) static drive mode.
(b) 1:2 multiplex drive mode.
(c) 1:3 multiplex drive mode.
(d) 1:4 multiplex drive mode.
BP0
(1/3 bias)
SYNC
SYNC
BP0
(1/3 bias)
mgl755



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