PTC PT6324

PT6324
VFD Driver/Controller IC
DESCRIPTION
PT6324 is a Vacuum Fluorescent Display (VFD)
Controller driven on a 1/8 to 1/16 duty factor housed in
52-pin plastic QFP/LQFP. 24 segment output lines, 16
grid output lines, one display memory, control circuit,
key scan circuit are all incorporated into a single chip
to build a highly reliable peripheral device for a single
chip micro computer. Serial data is fed to PT6324 via a
three-line serial interface.
APPLICATIONS
FEATURES
•
•
•
•
•
CMOS technology
Low power consumption
Wide operating voltage VDD=2.7V~5.5V
Key scanning (16 x 2 matrix)
Display modes: (24 segments, 8 digits to 24
segments, 16 digits)
• 8-Step dimming circuitry
• Serial interface for Clock, Data Input, Data Output,
Strobe pins
• No external resistors needed for driver outputs
• Microcomputer peripheral devices
• Digital Audio/Video system: CD/MD/VCD/DVD
players
• Car audio
• VCR
• Electric scale meter
• P.O.S.
• Electronic equipment with instructional display
BLOCK DIAGRAM
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6324
16-GRID X 24-SEGMENT VFD APPLICATION CIRCUIT
Notes:
1. The value of Rosc is depend on PT6324 IC chip supply voltage of VDD (Rosc=82KΩ, when VDD=5V; Rosc=100KΩ, when VDD=3.3V).
2. Z1, Z2=Zener diode 5.1V
3. Please adding the current amplifying circuit as following figure when IOHGR>15mA on VFD panel for high brightness issue.
*=C.A. Circuit=Current amplifying circuit
C.A. Circuit-1 & C.A. Circuit-2 Ex.:
Parts recommended:
• Q=SAMSUNG-KSR1105 (General fast switching transistor)
• D=HITACHI-HSM221C (General fast recovery diode)
V1.3
2
PT6324
ORDER INFORMATION
Valid Part Number
PT6324-Q
PT6324-LQ
Package Type
52-Pin, QFP
52-Pin, LQFP
Top Code
PT6324-Q
PT6324-LQ
PIN CONFIGURATION
V1.3
3
PT6324
PIN DESCRIPTION
Pin Name
I/O
CLK
I
DIN
I
STB
I
DOUT
O
K1 to K2
I
OSC
I
GND
VDD
SG1/KS1 to
SG16/KS16
SG17 to SG24
GR1 to GR16
VEE
-
V1.3
O
O
O
-
Description
Clock input pin
This pin reads serial data at the rising edge and outputs data at the falling edge.
Data input pin
When this pin acts as input pin, serial data is inputted at the rising edge of the shift
clock (starting from the lower bit)
Serial interface strobe pin
The data input after the STB has fallen is processed as a command. When this in
is “HIGH”, CLK is ignored.
Data output pin (N-channel, Open-drain)
When this pin acts as output pin, serial data is outputted at the falling edge of the
shift clock (starting from the lower bit)
Key data input pins
The data inputted to these pins is latched at the end of the display cycle.
Oscillator input pin
A resistor is connected to this pin to determine the oscillation frequency.
Ground pin
Logic power supply
High-voltage segment output pins
Also acts as the key source
High-voltage segment output pins
High-voltage grid output pins
Pull-down level
Pin No.
1
2
3
4
5, 6
7
8, 52
9, 51
10 to 25
26 to 33
34 to 49
50
4