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CybraTech (2000) Ltd.
SOC-3000/i Scale-On-Chip
ASIC
Technical Specification
Revision B
Page 36
July, 2002
TABLE 16: MAXIMUM DISPLAY CAPACITY PER DISPLAY CONFIGURATION
NUMBER OF
BACKPLANES
SEGMENTS OR
SYMBOLS
NUMERIC
(7 SEGMENTS)
4
160
20
3
120
15
2
80
10
1
40
5
LCD Bias Generator
The operative LCD voltage is derived from VDD – VLCD (Figure 13). The three resistors
connected in series between VDD and VLCD in the bias generator function as a voltage
divider to produce 1/2 (for the 1:2 multiplex drive ratio) and 1/3 (for the 1:2, 1:3 and 1:4
multiplex drive ratio) biasing voltages. The bias configuration for each of the multiplex
drive ratios is given in Table 17.
For additional information on LCD drivers refer to LCD driver components datasheets
such as Phillips PCF8756.
TABLE 17: LCD BIAS CONFIGURATIONS
MULTIPLEX DRIVE
MODE
# BACKPLANES
# LEVELS
BIAS
CONFIGURATION
Static
1
2
Static
1:2
2
3
1/2
1:2
2
4
1/3
1:3
3
4
1/3
1:4
4
4
1/3
Drive Mode Waveforms
The waveforms for the Static drive mode are given in Figure 14, page 37.
The waveforms for the 1:2 Multiplex Drive Ratio–1/2 Bias are given in
Figure 15, page 38.
The waveforms for the 1:2 Multiplex Drive Ratio–1/3 Bias are given in
Figure 16, page 39.
The waveforms for the 1:3 Multiplex Drive Ratio are given in Figure 17, page 40.
The waveforms for the 1:4 Multiplex Drive Ratio are given in Figure 18, page 41.
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