PCF8578T/1 NXP Semiconductors, PCF8578T/1 Datasheet - Page 11

• Manufacturer Part Number: PCF8578T/1
• Description: IC, LCD DRIVER, ROW/COLUMN, 56VSOP
• Manufacturer: NXP Semiconductors

Specifications of PCF8578T/1

• Supply Current: 20µA
• No. Of Digits / Alpha: 36
• Meter Display Type: LCD
• Supply Voltage Range: 2.5V To 6V
• Driver Case Style: VSOP
• No. Of Pins: 56
• Operating Temperature Range: -40°C To +85°C
• Base: RoHS Compliant
• No. Of Segments: 384
• Interface Type: I2C
• Rohs Compliant: Yes

NXP Semiconductors
PCF8578_6
Product data sheet
where the values for n are determined by the multiplex rate (1:n). Valid values for n are:
Table 6.
Table 7.
Figure 6
Bias ratios
Discrimination
ratios
V
------------------------ -
D
------------- -
V
------------- -
V
------------- -
V
------------- -
V
V
-----------------------
V
------------- -
V
n = 8 for 1:8 multiplex
n = 16 for 1:16 multiplex
n = 24 for 1:24 multiplex
n = 32 for 1:32 multiplex
V
V
V
V
off RMS
oper
oper
oper
oper
on RMS
oper
V
V
=
th
2
3
4
5
oper
oper
------------------------ -
V
V
off RMS
on RMS
shows the values of
Optimum LCD voltages
Discrimination ratios
Multiplex rate
1:8
0.739
0.522
0.478
0.261
Multiplex rate
1:8
0.297
0.430
1.447
3.370
Rev. 06 — 5 May 2009
Table 6
LCD row/column driver for dot matrix graphic displays
1:16
0.800
0.600
0.400
0.200
1:16
0.245
0.316
1.291
4.080
as graphs.
1:24
0.830
0.661
0.339
0.170
1:24
0.214
0.263
1.230
4.680
PCF8578
© NXP B.V. 2009. All rights reserved.
1:32
0.850
0.700
0.300
0.150
1:32
0.193
0.230
1.196
5.190
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