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PCF8531U データシート(PDF) 21 Page - NXP Semiconductors

部品番号 PCF8531U
部品情報  34 x 128 pixel matrix driver
PDF  44 Pages
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メーカー  NXP [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8531U データシート(HTML) 21 Page - NXP Semiconductors

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PCF8531_4
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 13 June 2008
21 of 44
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
9.8 LCD bias voltage
9.9 Set VLCD value
VLCD can be set by software. The voltage at intersection temperature [VLCD (T=Tints)] can
be calculated as: VLCD (Tints)=a+VLCD × b
The generated voltage is dependent on the temperature, programmed Temperature
Coefficient (TC) and the programmed voltage at intersection temperature (Tints).
VLCD = VLCD (Tints) × [1 + TC × (T − Tints)]
The parameter values are given in Table 10. Two overlapping VLCD ranges can be
selected via the command ‘HV-gen control’ (see Table 10 and Figure 11). The maximum
voltage which can be generated depends on the VDD2 and VDD3 voltages and the display
load current. For multiplex rate 1:34, the optimum VLCD can be calculated as:
Where Vth is the threshold voltage of the liquid crystal material used.
Table 8.
Programming the required bias system
BS2
BS1
BS0
n
Bias system
Comment
0007
1
⁄
11
0016
1
⁄
10
0105
1
⁄
9
0114
1
⁄
8
1003
1
⁄
7
recommended for 1:34
1012
1
⁄
6
recommended for 1:26
1101
1
⁄
5
recommended for 1:17
1110
1
⁄
4
recommended for icon mode
Table 9.
Intermediate LCD bias voltages
Symbol
Bias voltage
Example for 1
⁄7 bias
V1
VLCD
VLCD
V2
6
⁄7 × VLCD
V3
5
⁄7 × VLCD
V4
2
⁄7 × VLCD
V5
1
⁄7 × VLCD
V6
VSS
VSS
n3
+
n4
+
------------
V
LCD
×
n2
+
n4
+
------------
V
LCD
×
2
n4
+
------------
V
LCD
×
1
n4
+
------------
V
LCD
×
V
LCD
134
+
21
1
34
----------
–


×
--------------------------------------
V
th
×
5.30
V
th
×
==



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