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PCF8576D Datasheet(PDF) 33 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF8576D Datasheet(HTML) 33 Page - NXP Semiconductors

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PCF8576D
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
33 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
The contact resistance between the SYNC on each cascaded device must be controlled.
If the resistance is too high, the device is not able to synchronize properly; this is
particularly applicable to chip-on-glass applications. The maximum SYNC contact
resistance allowed for the number of devices in cascade is given in Table 18.
The PCF8576D can be cascaded with the PCF8562, the PCF8533 or the PCF8534A.
This allows optimal drive selection for a given number of pixels to display. Figure 20 and
Figure 21 show the timing of the synchronization signals.
Table 18.
SYNC contact resistance
Number of devices
Maximum contact resistance
26 k
Ω
3 to 5
2.2 k
Ω
6 to 10
1.2 k
Ω
10 to 16
700
Ω
Fig 22. Cascaded PCF8576D configuration
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
SDA
SCL
CLK
OSC
SYNC
1, 58, 59
2, 3
4
5
7
89
6
8
9
10
11
12
13
10
11
12
40 segment drives
4 backplanes
40 segment drives
LCD PANEL
(up to 2560
elements)
PCF8576DU
A0
A1
A2
SA0
VDD
VLCD
DD
V
LCD
V
mdb077
SDA
SCL
SYNC
CLK
OSC
1, 58, 59
613
2, 3
4
5
7
BP0 to BP3
(open-circuit)
A0
A1
A2
SA0 VSS
VSS
VSS
VDD
VLCD
PCF8576DU
BP0 to BP3
R
tr
2CB


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