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PCF8548U/2 数据表(PDF) 20 Page - NXP Semiconductors

部件名 PCF8548U/2
功能描述  65 x 102 pixels matrix LCD driver
PDF  40 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

PCF8548U/2 数据表(HTML) 20 Page - NXP Semiconductors

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1999 Aug 16
20
Philips Semiconductors
Product specification
65
× 102 pixels matrix LCD driver
PCF8548
Table 4
Programming the required bias system
BS[2]
BS[1]
BS[0]
n
RECOMMENDED MUX RATE
0007
1 : 100
0016
1 : 81
0105
1 : 64
0114
1 : 49
1003
1 : 36
1012
1 : 24
1101
1 : 16
1110
1 : 9
Table 5
LCD bias voltage
12.10 Set VOP value
The voltage at reference temperature can be calculated
as: [VLCD (T = Tcut)]
(1)
The operating voltage VLCD can be set by software.
The generated voltage is dependent on the temperature,
programmed Temperature Coefficient (TC) and the
programmed voltage at reference temperature (Tcut).
(2)
SYMBOL
BIAS VOLTAGES
BIAS VOLTAGES
FOR 1
⁄9 BIAS
V1
VLCD
VLCD
V2
(n + 3)/(n + 4)
8
⁄9 × VLCD
V3
(n + 2)/(n + 4)
7
⁄9 × VLCD
V4
2/(n + 4)
2
⁄9 × VLCD
V5
1/(n + 4)
1
⁄9 × VLCD
V6
VSS
VSS
V
LCD
Tcut
()
aV
OP
b
×
+
()
=
V
LCD
aV
OP
b
×
+
()
1T
T
cut
–
() TC
×
+
[]
×
=
The parameters are explained in Fig.16 and Table 6.
The maximum voltage that can be generated is dependent
on the VDD2 voltage and the display load current.
Two overlapping VLCD ranges are selectable via the
command ‘HV-gen control’. For the LOW (PRS = 0) range
a=a1 and for the HIGH (PRS = 1) range a = a2 with steps
equal to b in both ranges. It should be noted that the
charge pump is turned off if VOP[6;0] and bit PRS are all set
to zero. For Mux 1 : 65 the optimum operation voltage of
the liquid can be calculated as follows:
where Vth is the threshold voltage of the liquid crystal
material used.
V
LCD
165
+
21
1
65
----------
–


×
---------------------------------------
V
th
6.85
V
th
×
=
×
=
Table 6
Typical values for parameters for the HV-generator programming
SYMBOL
BITS
VALUE
UNIT
a1
2.94 (PRS = 0)
V
a2
6.75 (PRS = 1)
V
b
0.03
V
Tcut
27
°C



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