Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LED Driver IC
PT6964
DESCRIPTION
PT6964 is an LED Controller driven on a 1/5 to 1/8 duty factor. 10 segment output lines, 4 grid output
lines, 3 segment/ 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
microcomputer. Serial data is fed to PT6964 via a three-line serial interface. Housed in a 28 pins SOP
Package, PT6964 pin assignments and application circuit are optimized for easy PCB Layout and cost
saving advantages.
FEATURES
•
•
•
•
•
•
•
CMOS technology
Low power consumption
Multiple display modes (10 segment, 7 grid to 13 segment, 4 grid)
Key scanning (10 x 2 Matrix)
8-step dimming circuitry
Serial interface for clock, data input, data output, strobe pins
Available in 28 pins, SOP
APPLICATIONS
•
•
•
Micro-computer peripheral device
VCR set
Combo set
PT6964 V1.3
-1-
September, 2008
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LED Driver IC
PT6964
BLOCK DIAGRAM
SG1/KS1
SG2/KS2
Control
DI/O
CLK
STB
Serial
Data
Interface
SG3/KS3
SG4/KS4
Display
Memory
Segment Driver/
Key Scan Output/
Grid Driver
SG5/KS5
SG6/KS6
SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
Key Matrix
Memory
SG12/GR7
Dimming Circuit
SG13/GR6
SG14/GR5
GR4
GR3
GR2
GR1
OSC
R
OSC
Timing Generator
K1
K2
VDD GND
PIN DESCRIPTION
OSC
DI/O
CLK
STB
K1
K2
VDD
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
GND
GR1
GR2
GND
GR3
GR4
GND
VDD
SG14/GR5
SG13/GR6
SG12/GR7
SG10/KS10
SG9/KS9
SG8/KS8
PT6964
22
21
20
19
18
17
16
15
PT6964 V1.3
-2-
September, 2008
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LED Driver IC
PT6964
INPUT/OUTPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below.
•
Input Pins: CLK, STB
•
Input Pins: K1 to K2
•
Output Pins: GR1 to GR4
•
Output Pins: SG1/KS1 to SG10/KS10
•
Output Pins: SG14/GR5, SG13/GR6
and SG12/GR7
•
Input Pin & Output Pin: DI/O
VDD
VSS
PT6964 V1.3
-3-
September, 2008
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LED Driver IC
PT6964
PIN DESCRIPTION
Pin Name
OSC
I/O
I
Description
Pin No.
Oscillator Input Pin
A resistor is connected to this pin to determine the
1
oscillation frequency
Data Input Pin
This pin inputs serial data at the rising edge of the
2
shift clock (starting from the lower bit)
Data Output Pin (N-Channel, Open-Drain)
Clock Input Pin This pin reads serial data at the
3
rising edge and outputs data at the falling edge.
Serial Interface Strobe Pin
The data input after the STB has fallen is processed
4
as a command. When this pin is HIGH", CLK is
ignored.
Key Data Input Pins
The data sent to these pins are latched at the end
5, 6
of the display cycle. (Internal Pull-Low Resistor)
Ground Pin
22, 25, 28
Segment Output Pins (p-channel, open drain)
8 ~ 17
Also acts as the Key Source
Segment / Grid Output Pins
18 ~ 20
Power Supply
7, 21
Grid Output Pins
26, 27, 23, 24
DI/O
CLK
STB
I/O
I
I
K1 ~ K2
GND
SG1/KS1 ~ SG10/KS10
SG12/GR7 ~ SG14/GR5
VDD
GR4 ~ GR1
I
-
O
O
-
O
PT6964 V1.3
-4-
September, 2008
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
LED Driver IC
PT6964
FUNCTION DESCRIPTION
COMMANDS
A command is the first byte (b0 to b7) inputted to PT6964 via the DI/O 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.
COMMANDS 1: DISPLAY MODE SETTING COMMANDS
PT6964 provides 2 display mode settings as shown in the diagram below: As stated earlier a
command is the first one byte (b0 to b7) transmitted to PT6964 via the DI/O Pin when STB is LOW.
However, for these commands, the bit 3 to bit 6 (b2 to b5) are ignored, bit 7 & bit 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
(10 to 13 segments, 7 to 4 grids). A display command ON 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 7-grid, 10-segment modes is selected.
MSB
0
0
-
-
-
-
LSB
b1 b0
Display mode settings:
00: 4 digits, 13 segments
01: 5 digits, 12 segments
10: 6 digits, 11 segments
11: 7 digits, 10 segments
Not Relevant
PT6964 V1.3
-5-
September, 2008
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