參數(shù)資料
型號: PCF8535
廠商: NXP Semiconductors N.V.
英文描述: 65 x 133 pixel matrix driver
中文描述: 65 × 133像素矩陣驅動程序
文件頁數(shù): 11/52頁
文件大小: 1765K
代理商: PCF8535
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
S
ET 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 V
OP
. A compromise between contrast and V
OP
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
0
1
0
0
1
1
0
0
1
0
1
0
1 : 17
1 : 26
1 : 34
1 : 49
1 : 65
do not use
R0 to R15 and R64
R0 to R24 and R64
R0 to R32 and R64
R0 to R47 and R64
R0 to R64
101
111
BS[2]
BS[1]
BS[0]
n
BIAS MODE
TYPICAL MUX RATES
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
7
6
5
4
3
2
1
0
1
/
11
1
/
10
1
/
9
1
/
8
1
/
7
1
/
6
1
/
5
1
/
4
1 : 100
1 : 80
1 : 65
1 : 49
1 : 33
1 : 26
1 : 17
1 : 9
n
Mux rate
3
=
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