PCF8566T NXP Semiconductors, PCF8566T Datasheet - Page 8
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PCF8566T
Manufacturer Part Number
PCF8566T
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PCF8566T.pdf
(48 pages)
Specifications of PCF8566T
Operating Supply Voltage (typ)
3.3/5V
Number Of Digits
12
Number Of Segments
96
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Package Type
VSO
Pin Count
40
Mounting
Surface Mount
Power Dissipation
400mW
Frequency (max)
315KHz
Operating Supply Voltage (min)
2.5V
Operating Supply Voltage (max)
6V
Lead Free Status / Rohs Status
Not Compliant
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NXP Semiconductors
Table 5.
PCF8566_7
Product data sheet
LCD drive mode Number of:
static
1:2 multiplex
1:2 multiplex
1:3 multiplex
1:4 multiplex
Preferred LCD drive modes: summary of characteristics
Backplanes
1
2
2
3
4
A practical value for V
threshold voltage (V
the static drive mode a suitable choice is V
Multiplex drive modes of 1:3 and 1:4 with
hence the contrast ratios are smaller.
Bias is calculated by
The RMS on-state voltage (V
where V
The RMS off-state voltage (V
Discrimination is the ratio of V
Using
V
V
----------------------- -
V
V
•
on RMS
off RMS
a = 1 for
a = 2 for
n = 1 for static mode
n = 2 for 1:2 multiplex
n = 3 for 1:3 multiplex
n = 4 for 1:4 multiplex
off RMS
on RMS
1:3 multiplex with
Equation
LCD
Bias levels
2
3
4
4
4
=
=
=
1
1
2
3
V
is the resultant voltage at the LCD segment and where the values for n are
V
bias
bias
LCD
LCD
------------------------------------------- -
a
a 1
3, the discrimination for an LCD drive mode of
----------------------------------------------------------- -
+
1
-- -
n
–
a
-------------------------------- -
n
+
2
1
th
–
------------ -
1
), typically when the LCD exhibits approximately 10 % contrast. In
Rev. 07 — 25 February 2009
2
2
LCD
1
LCD bias
configuration
static
1
1
1
1
1
+
1
+
+
2
n 1
2a
2
3
3
3
bias is
+
a
–
is determined by equating V
n 1
n 1
+
, where the values for a are
a
–
–
n
n
on(RMS)
off(RMS)
2
on(RMS)
------------ -
1
3
1
+
) for the LCD is calculated with the equation
) for the LCD is calculated with the equation:
=
a
to V
1.732
V
--------------------------
0
0.354
0.333
0.333
0.333
2
off RMS
V
off(RMS)
1
Universal LCD driver for low multiplex rates
LCD
LCD
2
bias are possible but the discrimination and
> 3V
and is determined from the equation:
th
.
off(RMS)
1
0.791
0.745
0.638
0.577
V
------------------------ -
on RMS
V
LCD
with a defined LCD
PCF8566
© NXP B.V. 2009. All rights reserved.
D
2.236
2.236
1.915
1.732
=
--------------------------
V
V
off RMS
on RMS
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