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PCF85134 Datasheet(PDF) 33 Page - NXP Semiconductors

Part # PCF85134
Description  Universal LCD driver for low multiplex rates
PDF  40 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF85134 Datasheet(HTML) 33 Page - NXP Semiconductors

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PCF85134_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 17 December 2009
33 of 40
NXP Semiconductors
PCF85134
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 21. Synchronization of the cascade for various PCF85134 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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