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PCF8531U2DA Datasheet(PDF) 22 Page - NXP Semiconductors

Part # PCF8531U2DA
Description  34 x 128 pixel matrix driver Single-chip LCD controller and driver
PDF  51 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8531U2DA Datasheet(HTML) 22 Page - NXP Semiconductors

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PCF8531
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 6 — 16 May 2011
22 of 51
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
9.7 Set bias system
The bias voltage levels are set in the ratio of R
− R − n × R − R − R (see Figure 11).
Different multiplex rates require different bias settings. Bias settings are programmed by
BS[2:0], which sets the binary number n. The optimum value for n is given by:
Supported values of n are given in Table 8. Table 9 shows the intermediate bias voltages.
Fig 11. Voltage divider chain
Table 8.
Programming the required bias system
BS[2:0]
n
Bias system
Comment
000
7
1
⁄
11
-
001
6
1
⁄
10
-
010
5
1
⁄
9
-
011
4
1
⁄
8
-
100
3
1
⁄
7
recommended for 1:34
101
2
1
⁄
6
recommended for 1:26
110
1
1
⁄
5
recommended for 1:17
111
0
1
⁄
4
recommended for icon mode
R
R
R
n
× R
R
V6 = VSS
V5
V4
V3
V2
V1 = VLCD
013aaa183
nmuxrate
3
–
=



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