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PCF8536AT Datasheet(PDF) 18 Page - NXP Semiconductors

Part # PCF8536AT
Description  Automotive 40 x 4 LCD driver
PDF  54 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8536AT Datasheet(HTML) 18 Page - NXP Semiconductors

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PCA85276
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2018. All rights reserved.
Product data sheet
Rev. 3 — 12 November 2018
18 of 54
NXP Semiconductors
PCA85276
Automotive 40 x 4 LCD driver
A practical value for VLCD is determined by equating Voff(RMS) with a defined LCD
threshold voltage (Vth(off)), typically when the LCD exhibits approximately 10 % contrast. In
the static drive mode a suitable choice is VLCD >3Vth(off).
Multiplex drive modes of 1:3 and 1:4 with 1⁄2 bias are possible but the discrimination and
hence the contrast ratios are smaller.
Bias is calculated by
, where the values for a are
a = 1 for 1⁄2 bias
a = 2 for 1⁄3 bias
The RMS on-state voltage (Von(RMS)) for the LCD is calculated with Equation 1:
(1)
where the values for n are
n = 1 for static drive mode
n = 2 for 1:2 multiplex drive mode
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
The RMS off-state voltage (Voff(RMS)) for the LCD is calculated with Equation 2:
(2)
Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 3:
(3)
Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with
1⁄2 bias is
and the discrimination for an LCD drive mode of 1:4 multiplex with
1⁄2 bias is
.
Table 15.
Biasing characteristics
LCD drive
mode
Number of:
LCD bias
configuration
Backplanes Levels
static
1
2
static
0
1
1:2 multiplex
2
3
1⁄2
0.354
0.791
2.236
1:2 multiplex
2
4
1⁄3
0.333
0.745
2.236
1:3 multiplex
3
4
1⁄3
0.333
0.638
1.915
1:4 multiplex
4
4
1⁄3
0.333
0.577
1.732
V
off RMS

V
LCD
-------------------------
V
on RMS

V
LCD
------------------------
D
V
on RMS

V
off RMS

-------------------------
=
1
1a
+
-------------
V
on RMS

a2
2a
n
++
n
1a
+

2
------------------------------
V
LCD
=
V
off RMS

a2
2a
–
n
+
n
1a
+

2
------------------------------
V
LCD
=
D
V
on RMS

V
off RMS

-----------------------
a
2
2a
n
++
a
2
2a
–
n
+
---------------------------
==
3
1.732
=
21
3
----------
1.528
=



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