PCF8576DT NXP Semiconductors, PCF8576DT Datasheet - Page 8

• 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
7.1 Power-on reset
7.2 LCD bias generator
The host microprocessor or microcontroller maintains the 2-line I
channel with the PCF8576D. The internal oscillator is enabled by connecting
pin OSC to pin V
are generated internally. The only other connections required to complete the system are
to the power supplies (V
At power-on the PCF8576D resets to the following starting conditions:
Data transfers on the I
reset action to complete.
Fractional LCD biasing voltages are obtained from an internal voltage divider consisting of
three impedances connected in series between V
bypassed to provide a
voltage can be temperature compensated externally using the supply to pin V
Fig 5.
•
•
•
•
•
•
•
•
All backplane outputs are set to V
All segment outputs are set to V
The selected drive mode is: 1:4 multiplex with
Blinking is switched off
Input and output bank selectors are reset
The I
The data pointer and the subaddress counter are cleared (set to logic 0)
Display is disabled
V
V
SS
DD
CONTROLLER
PROCESSOR/
2
The resistance of the power lines must be kept to a minimum.
For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line
must be routed separately between the chip and the connector.
Typical system configuration
C-bus interface is initialized
MICRO-
MICRO-
HOST
R
SS
2C
. The appropriate biasing voltages for the multiplexed LCD waveforms
t
r
B
2
Rev. 09 — 25 August 2009
1
C-bus must be avoided for 1 ms following power-on to allow the
2
DD
bias voltage level for the 1:2 multiplex configuration. The LCD
, V
SS
and V
OSC
SDA
SCL
LCD
LCD
LCD
A0
) and the LCD panel chosen for the application.
Universal LCD driver for low multiplex rates
PCF8576D
A1
V
DD
A2
V
LCD
LCD
1
SA0
3
bias
and V
V
SS
40 segment drives
4 backplanes
SS
. The middle resistor can be
2
C-bus communication
PCF8576D
© NXP B.V. 2009. All rights reserved.
LCD PANEL
(up to 160
elements)
mdb079
LCD
.
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