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PT6575C
LCD Driver IC
DESCRIPTION
The PT6575C is 1/3 duty and 1/4 duty
general-purpose LCD driver that can be used for
frequency display in electronic tuners under the control
of a microcontroller. The PT6575C can drive an LCD
with up to 420 segments directly. The PT6575C can
also control up to 8 general-purpose output ports.
APPLICATION
• Electronic equipment with LCD Display
FEATURES
• Switching between 1/3 duty and 1/4 duty drive
techniques under serial data control.
• Switching between 1/2 bias and 1/3 bias drive
techniques under serial data control.
• Up to 318 segments for 1/3 duty drive and 420
segments for 1/4 duty drive can be displayed.
• Serial interface for clock, Data Input, Data Output,
Strobe pins.
• Serial data control of the power-saving mode
based backup function and all the segments forced
off function.
• Serial data control of switching between the
segment output port and the general-purpose
output port functions.
• Serial data control of frame frequency for common
and segment output waveforms.
• High generality, since display data is displayed
directly without decoder intervention.
• Built-in display contrast adjustment circuit
• Independent VLCD for the LCD driver block
• The /INH pin can force the display to the off state.
• RC oscillator circuit
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6575C
APPLICATION CIRCUIT
Note:
*=When a capacitor except the recommended external capacitance (Cosc=1000pF) is connected the OSC pin, we recommend that applications
connect the OSC pin with a capacitor in the range 220 to 2200pF.
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PT6575C
ORDER INFORMATION
Valid Part Number
PT6575C-TQ
Package Type
120 Pins, TQFP
Top Code
PT6575C-TQ
PIN CONFIGURATION
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PT6575C
PIN DESCRIPTION
Pin Name
I/O
Active
Handling
when unused
S1/P1 to S8/P8
S9 to S105
O
-
Open
COM1 to COM3
COM4/S106
O
-
Open
OSC
I/O
-
VDD
I
H
CE
CL
DI
I
GND
I
-
/INH
I
L
GND
VLCD0
O
-
Open
VLCD1
I
-
Open
VLCD2
I
-
Open
VDD
-
-
-
VLCD
-
-
-
VSS
-
-
-
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Function
Segment outputs for displaying the display data
transferred by serial data input. The pins S1/P1 to
S8/P8 can be used as general-purpose output ports
when so set up by the control data.
Common driver outputs.
The frame frequency is fO Hz.
The COM4/S106 pin can be used as a segment
output in 1/3 duty.
Oscillator connection.
An oscillator circuit is formed by connecting an
external resistor and capacitor to this pin.
Serial data transfer inputs. These pins are connected
to the control microprocessor.
CE: Chip enable
CL: Synchronization clock
DI: Transfer data
Display off control input
• /INH=low (VSS)…off
S1/P1 to S8/P8=low (VSS)
(These pins are forcibly set to the segment output
port function and fixed at the VSS level)
S9 to S105=low (VSS)
COM1 to COM3=low (VSS)
COM4/S106=low(Vss)
• /INH=high (VDD)…on
Note that serial data transfers can be performed when
the display is forced off by this pin.
LCD Drive 3/3 bias voltage (high level) supply. This
level can be modified using the display contrast
adjustment circuit. However, note that VLCD0 must be
greater than or equal to 2.7V. Also, since this IC
provides the built-in display contrast adjustment
circuit, applications must not attempt to provide this
level from external circuits.
LCD drive 2/3 bias voltage (middle level) supply. It is
possible to supply the 2/3 VLCD0 voltage to this pin
externally. This pin must be shorted to VLCD2 if 1/2 bias
is used.
LCD drive 1/3 bias voltage (middle level) supply. It is
possible to supply the 1/3 VLCD0 voltage to this pin
externally. This pin must be shorted to VLCD1 if 1/2 bias
is used.
Logic block power supply. Provide a voltage in the
range 2.7 to 6.0V.
LCD driver block power supply. When VLCD0 is
between 0.7VLCD and 0.95VLCD, supply a voltage in
the range 4.0 to 6.0V. When VLCD0 and VLCD will be
equal, supply a voltage in the range 2.7 to 6.0V.
Ground pin. Connect to ground.
Pin No.
1 to 8
9 to 105
109 to
107
106
116
118
119
120
117
112
113
114
110
111
115
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PT6575C
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian, Taipei 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
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