Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
VFD Driver/Controller IC
PT6315-S
DESCRIPTION
PT6315-S is a Vacuum Fluorescent Display (VFD) Controller driven on a 1/4 to 1/8 duty factor. Eight
segment output lines, 4 grid output lines, 4 segment/grid output drive 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 PT6315-S via a three-line serial interface.
It is housed in a 28pins, SOP.
FEATURES
•
•
•
•
•
•
•
•
CMOS Technology
Low Power Consumption
Key Scanning (8 x 2 matrix)
Multiple Display Modes: (8 Segments, 8 Digits to 12 Segments, 4 Digits)
8-Step Dimming Circuitry
Serial Interface for Clock, Data Input, Data Output, Strobe Pins
No External Resistors Needed for Driver Outputs
Available in 28pins, SOP
APPLICATION
•
Microcomputer Peripheral Devices
PT6315-S V1.9
-1-
September, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
VFD Driver/Controller IC
PT6315-S
BLOCK DIAGRAM
SG1/KS1
Control
DIN
DOUT
CLK
STB
Serial
Data
Interface
Segment
Driver/
Display Memory
Grid
Driver/
Key Scan
Output
OSC
OSC
R
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG8/KS8
SG9/GR8
SG10/GR7
Timing Generator
SG11/GR6
SG12/GR5
Key Matrix Memory
GR1
Grid
Driver
GR2
GR3
GR4
Dimming Circuit
K1
K2
VDD
GND
VEE
PT6315-S V1.9
-2-
September, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
VFD Driver/Controller IC
PT6315-S
PIN CONFIGURATION
CLK
STB
K1
K2
VSS
VDD
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG8/KS8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
DIN
DOUT
OSC
VSS
VDD
GR1
GR2
GR3
GR4
SG12/GR5
SG11/GR6
SG10/GR7
SG9/GR8
VEE
P T 63 1 5- S
22
21
20
19
18
17
16
15
PT6315-S V1.9
-3-
September, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
VFD Driver/Controller IC
PT6315-S
PIN DESCRIPTION
Pin Name
CLK
STB
K1 to K2
VSS
VDD
SG1/KS1 to SG8/KS8
VEE
SG9/GR8 to SG12/GR5
GR4 to GR1
OSC
DOUT
DIN
I/O
I
I
I
-
-
O
-
O
O
I
O
I
Description
Pin No.
Clock Input Pin This pin reads serial data at the rising
1
edge and outputs data at the falling edge.
Serial Interface Strobe Pin The data input after the STB
has fallen is processed as a command. When this pin is
2
“HIGH”, CLK is ignored.
Key Data Input Pins The data sent to these pins are
3, 4
latched at the end of the display cycle.
Logic Ground Pin
5, 25
Logic Power Supply
6, 24
High Voltage Segment Output Pins Also acts as the Key
7 to 14
Source
Pull Down Level
15
High Voltage Segment/Grid Output Pins
16 to 19
High Voltage Grid Output Pins
20 to 23
Oscillator Input Pin A resistor is connected to this pin to
26
determine the oscillation frequency.
Data Output Pin (N-Channel, Open Drain) This pin
outputs serial data at the falling edge of the shift clock
27
(starting from the lower bit).
Data Input Pin This pin inputs serial data at the rising
28
edge of the shift clock (starting from the lower bits).
PT6315-S V1.9
-4-
September, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
VFD Driver/Controller IC
PT6315-S
FUNCTION DESCRIPTION
COMMANDS
Commands determine the display mode and status of PT6315-S. A command is the first byte (b0 to b7)
inputted to PT6315-S via the DIN Pin after STB Pin has changed from “HIGH” to “LOW” State. If for
some reason the STB Pin is set to “HIGH” while data or commands are being transmitted, the serial
communication is initialized, and the data/commands being transmitted are considered invalid.
COMMAND 1: DISPLAY MODE SETTING COMMANDS
PT6315-S provides 4 display mode settings as shown in the diagram below: As stated earlier a
command is the first one byte (b0 to b7) transmitted to PT6315-S via the DIN Pin when STB is “LOW”.
However, for these commands, the bits 5 to 6 (b4 to b5) are ignored, bits 7 & 8 (b6 to b7) are given a
value of “0”.
The Display Mode Setting Commands determine the number of segments and grids to be used (1/4 to
1/8 duty, 12 to 8 segments). When these commands are executed, the display is forcibly turned off, the
key scanning stops. A display “ON” command must be executed in order to resume display. If the same
mode setting is selected, no command execution is take place, therefore, nothing happens.
When Power is turned “ON”, the 8-digit, 8-segment mode is selected.
MSB
0
0
-
-
LSB
b3 b2 b1 b0
Display Mode Settings:
0000: 4 digits, 12 segments
0011: 5 digits, 11 segments
0100: 6 digits, 10 segments
0101: 7 digits, 9 segments
0110: 8 digits, 8 segments
Not Relevant
PT6315-S V1.9
-5-
September, 2005
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