OM6290 NXP Semiconductors, OM6290 Datasheet - Page 22

• Manufacturer Part Number: OM6290
• Description: DEMO BOARD LCD GRAPHIC DRIVER
• Manufacturer: NXP Semiconductors

Specifications of OM6290

• Main Purpose: Displays, LCD Controller
• Embedded: Yes, MCU, 16/32-Bit
• Utilized Ic / Part: PCF2119, PCF8531, PCF8576
• Primary Attributes: Character, Graphic and Segment LCD Drivers
• Secondary Attributes: JTAG, I²C, UART & USB Interfaces
• Description/function: Demo Board
• Interface Type: USB, I2C, JTAG, UART
• Data Bus Width: 4 bit, 8 bit, 16 bit
• Operating Voltage: 1.8 V to 5.5 V
• For Use With/related Products: PCF8576DT, PCF2119S, PCF8531
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4703

NXP Semiconductors
PCF8531
Product data sheet
9.7 Set bias system
The bias voltage levels are set in the ratio of R − R − n × R − R − R (see
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.
n
BS[2:0]
000
001
010
011
100
101
110
111
Fig 11. Voltage divider chain
=
muxrate 3
Programming the required bias system
–
All information provided in this document is subject to legal disclaimers.
n
7
6
5
4
3
2
1
0
Rev. 05 — 10 August 2010
Table
R
R
n × R
R
R
Bias system
1
1
1
1
1
1
1
1
⁄
⁄
⁄
⁄
⁄
⁄
⁄
⁄
11
10
9
8
7
6
5
4
8.
Table 9
V
V
V
V
V
V
013aaa183
1
2
3
4
5
6
= V
= V
shows the intermediate bias voltages.
LCD
SS
Comment
-
-
-
-
recommended for 1:34
recommended for 1:26
recommended for 1:17
recommended for icon mode
34 x 128 pixel matrix driver
PCF8531
© NXP B.V. 2010. All rights reserved.
Figure
11).
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