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PCF8531 Datasheet(PDF) 23 Page - NXP Semiconductors

Part # PCF8531
Description  34 x 128 pixel matrix driver
PDF  51 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8531 Datasheet(HTML) 23 Page - NXP Semiconductors

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PCF8531
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 05 — 10 August 2010
23 of 51
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 12). 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.
The practical value for VLCD is determined by equating Voff(RMS) with a defined LCD
threshold voltage (Vth), typically when the LCD exhibits approximately 10 % contrast.
As the programming range for the internally generated VLCD allows values above the
maximum allowed VLCD, the user must ensure, while setting the VOP register and
selecting the temperature compensation, that the VLCD limit maximum of 9.0 V is never
exceeded under all conditions and including all tolerances.
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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