pcf8534a NXP Semiconductors, pcf8534a Datasheet - Page 32
pcf8534a
Manufacturer Part Number
pcf8534a
Description
Universal Lcd Driver For Low Multiplex Rates
Manufacturer
NXP Semiconductors
Datasheet
1.PCF8534A.pdf
(44 pages)
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PCF8534A_3
Product data sheet
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
Table 19.
Number of devices
2
3 to 5
6 to 10
11 to 16
Fig 22. Synchronization of the cascade for various PCF8534A drive modes
shows the maximum contact resistance values.
SYNC contact resistance
(1/2 bias)
(1/3 bias)
(1/3 bias)
(1/3 bias)
BP0
SYNC
SYNC
SYNC
SYNC
BP0
BP0
BP0
BP0
Rev. 03 — 10 November 2008
(b) 1:2 multiplex drive mode.
(c) 1:3 multiplex drive mode.
(d) 1:4 multiplex drive mode.
(a) static drive mode.
T
Universal LCD driver for low multiplex rates
fr
=
Maximum contact resistance
6000
2200
1200
700
f
1
fr
PCF8534A
mgl755
© NXP B.V. 2008. All rights reserved.
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