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PCA8551ATT/AJ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54P55-P57
PCA8551 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 2 — 24 March 2015 19 of 57
NXP Semiconductors
PCA8551
Automotive 36 × 4 LCD segment driver
V
on(RMS)
(see Equation 3) and V
off(RMS)
(see Equation 5) are properties of the display
driver and are affected by the selection of a
bias
, n
MUX
, and the V
LCD
voltage.
V
th(off)
and V
th(on)
are properties of the LCD liquid and can be provided by the module
manufacturer. V
th(off)
is sometimes named V
th
. V
th(on)
is sometimes named saturation
voltage V
sat
.
It is important to match the module properties to those of the driver in order to achieve
optimum performance.
Fig 11. Electro-optical characteristic: relative transmission curve of the liquid
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PCA8551 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 2 — 24 March 2015 20 of 57
NXP Semiconductors
PCA8551
Automotive 36 × 4 LCD segment driver
9.2.2 LCD drive mode waveforms
9.2.2.1 Static drive mode
The static LCD drive mode is used when a single backplane is provided in the LCD. The
backplane (COMn) and segment (SEGn) drive waveforms for this mode are shown in
Figure 12
.
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 12. Static drive mode waveforms
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PCA8551 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 2 — 24 March 2015 21 of 57
NXP Semiconductors
PCA8551
Automotive 36 × 4 LCD segment driver
9.2.2.2 1:2 Multiplex drive mode
When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The
PCA8551 allows the use of
1
⁄
2
bias or
1
⁄
3
bias in this mode as shown in Figure 13 and
Figure 14
.
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 13. Waveforms for the 1:2 multiplex drive mode with
1
⁄
2
bias
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P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54P55-P57

PCA8551ATT/AJ

Mfr. #:
Buy PCA8551ATT/AJ
Manufacturer:
NXP Semiconductors
Description:
Flip Flops Automotive 36X4 LCD segment driver
Lifecycle:
New from this manufacturer.
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