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PCF8535 датащи(PDF) 11 Page - NXP Semiconductors

номер детали PCF8535
подробное описание детали  65 x 133 pixel matrix driver
PDF  52 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8535 датащи(HTML) 11 Page - NXP Semiconductors

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1999 Aug 24
11
Philips Semiconductors
Objective specification
65
× 133 pixel matrix driver
PCF8535
7.9
Set multiplex rate
The PCF8535 can be used to drive displays of varying sizes. The multiplex mode selected controls which rows are used.
In all cases, the last row is always driven and is intended for icons. If Top Row Swap (TRS) is at logic 1 then the icon row
will be output on pad R48. M[2:0] selects the multiplex rate (see Table 2).
Table 2
Multiplex rates
7.10
Bias system
7.10.1
SET BIAS SYSTEM
The bias voltage levels are set in the ratio of R
− R − nR − R − R. Different multiplex rates require different factors n. This
is programmed by BS[2:0]. For optimum bias values, n can be calculated from:
Changing the bias system from the optimum will have a consequence on the contrast and viewing angle. One reason to
come away from the optimum would be to reduce the required VOP. A compromise between contrast and VOP must be
found for any particular application.
Table 3
Programming the required bias system
M[2]
M[1]
M[0]
MULTIPLEX RATE
ACTIVE ROWS
0
0
0
1 : 17
R0 to R15 and R64
0
0
1
1 : 26
R0 to R24 and R64
0
1
0
1 : 34
R0 to R32 and R64
0
1
1
1 : 49
R0 to R47 and R64
1
0
0
1:65
R0toR64
101
− 111
do not use
−
BS[2]
BS[1]
BS[0]
n
BIAS MODE
TYPICAL MUX RATES
0007
1/11
1 : 100
0016
1/10
1:80
0105
1/9
1:65
0114
1/8
1:49
1003
1/7
1:33
1012
1/6
1:26
1101
1/5
1:17
1110
1/4
1:9
n
Mux rate
3
–
=



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