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PCF8551BTT/AJ
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
P37-P39
P40-P42
P43-P45
P46-P48
P49-P51
P52-P54
PCF8551
All informatio
n provided in this d
ocument is subje
ct to legal discl
aimers.
© NXP Semiconduc
tors N.V
. 201
5. All rights res
erved.
Product data sheet
Rev
.
2 — 16 February 2015
19 of 54
NXP Semiconductors
PCF8551
Universal 36 × 4
LCD segment driver
9.2.2
LCD drive mode waveforms
9.2.2.1
St
atic d
rive mode
The static LCD drive mode
is used when a single backplane is provided in the LCD. The
backplane (COMn) and segm
ent (SEGn) drive waveforms for this mo
de are shown in
Figure 1
1
.
V
state1
(t) = V
SEGn
(t)
V
COM0
(t).
V
on(RMS)
= V
LCD
.
V
state2
(t) = V
(SEGn + 1)
(t)
V
COM0
(t).
V
off(RMS)
= 0 V
.
Fig 1
1.
St
atic
drive mode wav
eforms
DDD
9
66
9
/&'
9
66
9
/&'
9
66
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
VWDWH
9
&20
6(*Q
6(*Q
VWDWH
9
D:
DYHIRUPVDWGULYHU
E5HVXOWDQWZDYHIRUPV
DW/&'VHJPHQW
/&'VHJPHQWV
VWDWH
RQ
VWDWH
RII
7
IU
PCF8551
All informatio
n provided in this d
ocument is subje
ct to legal discl
aimers.
© NXP Semiconduc
tors N.V
. 201
5. All rights res
erved.
Product data sheet
Rev
.
2 — 16 February 2015
20 of 54
NXP Semiconductors
PCF8551
Universal 36 × 4
LCD segment driver
9.2.2.2
1:2 Multi
plex drive
mode
When two backpla
nes are provide
d in the LCD, the 1:2 multiplex mo
de applies. The
PCF8551 allows
the use of
1
⁄
2
bias or
1
⁄
3
bias in this mode as shown in
Figure 12
and
Figure 13
.
V
state1
(t) = V
SEGn
(t)
V
COM0
(t).
V
on(RMS)
= 0.791V
LCD
.
V
state2
(t) = V
SEGn
(t)
V
COM1
(t).
V
off(RMS)
= 0.354V
LCD
.
Fig 12.
Waveforms for the 1:2 multiplex
drive mode with
1
⁄
2
bias
DDD
VWDWH
&20
D:
DYHIRUPVDWGULYHU
E5HVXOWDQWZDYHIRUPV
DW/&'VHJPHQW
/&'VHJPHQWV
VWDWH
&20
VWDWH
VWDWH
9
66
9
/&'
9
/&'
9
66
9
66
9
/&'
9
/&'
9
66
9
/&'
9
/&'
9
/&'
9
9
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
6(*Q
6(*Q
7
IU
9
/&'
PCF8551
All informatio
n provided in this d
ocument is subje
ct to legal discl
aimers.
© NXP Semiconduc
tors N.V
. 201
5. All rights res
erved.
Product data sheet
Rev
.
2 — 16 February 2015
21 of 54
NXP Semiconductors
PCF8551
Universal 36 × 4
LCD segment driver
V
state1
(t) = V
SEGn
(t)
V
COM0
(t).
V
on(RMS)
= 0.745V
LCD
.
V
state2
(t) = V
SEGn
(t)
V
COM1
(t).
V
off(RMS)
= 0.333V
LCD
.
Fig 13.
Waveforms for the 1:2 multiplex
drive mode with
1
⁄
3
bias
DDD
VWDWH
&20
D:
DYHIRUPVDWGULYHU
E5HVXOWDQWZDYHIRUPV
DW/&'VHJPHQW
/&'VHJPHQWV
VWDWH
&20
VWDWH
VWDWH
9
66
9
/&'
9
/&'
9
/&'
9
66
9
/&'
9
/&'
9
/&'
9
66
9
/&'
9
/&'
9
/&'
9
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
9
9
/&'
9
/&'
9
/&'
9
/&'
9
/&'
6(*Q
6(*Q
7
IU
9
66
9
/&'
9
/&'
9
/&'
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
P37-P39
P40-P42
P43-P45
P46-P48
P49-P51
P52-P54
PCF8551BTT/AJ
Mfr. #:
Buy PCF8551BTT/AJ
Manufacturer:
NXP Semiconductors
Description:
LCD Drivers Universal 36X4 LCD segment driver
Lifecycle:
New from this manufacturer.
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