PCF8576DT NXP Semiconductors, PCF8576DT Datasheet - Page 12

• Manufacturer Part Number: PCF8576DT
• Manufacturer: NXP Semiconductors

Specifications of PCF8576DT

• Operating Supply Voltage (typ): 2.5/3.3/5V
• Number Of Digits: 20
• Number Of Segments: 160
• Package Type: TSSOP
• Pin Count: 56
• Mounting: Surface Mount
• Power Dissipation: 400mW
• Frequency (max): 400KHz
• Operating Supply Voltage (min): 1.8V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Supplier Unconfirmed

NXP Semiconductors
PCF8576D_9
Product data sheet
7.4.2 1:2 Multiplex drive mode
The 1:2 multiplex drive mode is used when two backplanes are provided in the LCD. This
mode allows fractional LCD bias voltages of
Figure
Fig 7.
(1) V
(2) V
(3) V
(4) V
8.
Waveforms for the 1:2 multiplex drive mode with
state1
on(RMS)
state2
off(RMS)
Sn+1
state 1
state 2
(t) = V
(t) = V
BP0
BP1
S n
= 0.354V
= 0.791V
Sn
Sn+1
(t)
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Rev. 09 — 25 August 2009
0 V
0 V
V
V
V
V
(t)
LCD
LCD
SS
LCD
LCD
SS
LCD
SS
LCD
SS
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
LCD
V
/ 2
/ 2
/ 2
/ 2
BP0
V
.
.
/ 2
/ 2
BP1
(t).
(t).
(a) Waveforms at driver.
(b) Resultant waveforms
Universal LCD driver for low multiplex rates
at LCD segment.
1
2
bias or
T
fr
1
3
1
bias as shown in
2
bias
state 1
state 2
mgl746
LCD segments
PCF8576D
© NXP B.V. 2009. All rights reserved.
Figure 7
12 of 52
and