PT6965
LED Driver IC
DESCRIPTION
PT6965 is an LED Controller driven on a 1/5 to 1/8
duty factor. 11 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 PT6965 via a four-line serial
interface. Housed in a 30-pin SSOP and TSSOP,
PT6965 pin assignments and application circuit are
optimized for easy PCB Layout and cost saving
advantages.
FEATURES
•
CMOS technology
•
Low power consumption
•
Multiple display modes (14 segment, 4 Grid to 11
segment, 7 Grid)
•
Key scanning (10 x 2 Matrix)
•
8-Step dimming circuitry
•
Serial Interface for clock, data input, data output,
strobe pins and low voltage operation ability when
user’s MCU power supply is 3.3 V
•
Available in 30-pin, SSOP and TSSOP
APPLICATIONS
•
Micro-computer peripheral device
•
VCR set
•
Combo set
BLOCK DIAGRAM
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6965
APPLICATION CIRCUIT
Notes:
1. The capacitor (0.1 µF) connected between the GND and the VDD pins must be located as close as possible to the PT6965 chip.
2. The PT6965 power supply is separate from the application system power supply.
3. 10 KΩ
≧
R
≧
1 KΩ
COMMON CATHODE TYPE LED PANEL
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PT6965
ORDER INFORMATION
Valid Part Number
PT6965-X
PT6965-TX
Package Type
30-pin, SSOP, 209mil
30-pin, TSSOP, 173mil
Top Code
PT6965-X
PT6965-TX
PIN CONFIGURATION
OSC
DOUT
DIN
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
15
30
29
28
27
26
25
24
GND
GR1
GR2
GND
GR3
GR4
GND
VDD
SG14/GR5
SG13/GR6
SG12/GR7
SG11
SG10/KS10
SG9/KS9
SG8/KS8
P T 69 6 5
23
22
21
20
19
18
17
16
PIN DESCRIPTION
Pin Name
OSC
I/O
I
Description
Oscillator Input Pin
A resistor is connected to this pin to
determine the oscillation frequency
Data Output Pin (N-Channel, Open-Drain)
This pin outputs serial data at the
falling edge of the shift clock.
Data Input Pin
This pin inputs serial data at the rising edge
of the shift clock (starting from the lower bit)
Clock Input Pin This pin reads serial data at the rising 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 HIGH", CLK is ignored.
Key Data Input Pins
The data sent to these pins are latched at the end
of the display cycle. (Internal Pull-Low Resistor)
Power Supply
Segment Output Pins (p-channel, open drain)
Also acts as the Key Source
Segment Output pins (P-Channel, open drain)
Segment / Grid Output Pins
Ground Pin
Grid Output Pins
Pin No.
1
DOUT
O
2
DIN
CLK
I
I
3
4
STB
I
5
K1, K2
VDD
SG1/KS1 ~ SG10/KS10
SG11
SG12/GR7 ~ SG14/GR5
GND
GR4 ~ GR1
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I
-
O
O
O
-
O
6, 7
8, 23
9 ~ 18
19
20 ~ 22
24, 27, 30
25, 26, 28, 29
3
PT6965
INPUT/OUTPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below.
Input Pins: CLK, STB & DIN
Output Pins: K1 to K2
Output Pins: DOUT, GR1 to GR4
Output Pins: SG1 to SG11
Output Pins: SG14/GR5, SG13/GR6 and SG12/GR7
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PT6965
FUNCTION DESCRIPTION
COMMANDS
A command is the first byte (b0 to b7) inputted to PT6965 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.
COMMANDS 1: DISPLAY MODE SETTING COMMANDS
PT6965 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 PT6965 via the DIN Pin when STB is LOW. However, for these commands, the bit 3 & bit
8 (b2 to b7) are given a value of 0.
The Display Mode Setting Commands determine the number of segments and grids to be used (14 to 11 segments, 4 to
7 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, 11-segment modes is selected.
MSB
0
0
0
0
0
0
b1
LSB
b0
Display Mode Settings:
00: 4 digits, 14 segments
01: 5 digits, 13 segments
10: 6 digits, 12 segments
11: 7 digits, 11 segments
COMMANDS 2: DATA SETTING COMMANDS
The Data Setting Commands executes the Data Write or Data Read Modes for PT6965. The data Setting Command, the
bits 5 and 6 (b4, b5) are given the value of 0, bit 7 (b6) is given the value of 1 while bit 8 (b7) is given the value of 0.
Please refer to the diagram below.
When power is turned ON, bit 4 to bit 1 (b3 to b0) are given the value of 0.
MSB
0
1
0
0
b3
b2
b1
LSB
b0
Data Write & Read Mode Settings:
00: Write Data to Display Mode
10: Read Key Data
Address Increment Mode Settings (Display Mode):
0: Increment Address after Data has been written
1: Fixed Address
Mode Settings:
0: Normal Operation Mode
1: Test Mode
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