PT6964
LED Driver IC
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 segments, 7 grids to 13
segments, 4 grids)
•
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
BLOCK DIAGRAM
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6964
APPLICATION CIRCUIT
Notes:
1. The capacitor (0.1µF) connected between the GND and the VDD pins must be located as close as possible to the PT6964 chip.
2. The PT6964 power supply is separate from the application system power supply.
COMMON CATHODE TYPE LED PANEL
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PT6964
ORDER INFORMATION
Valid Part Number
PT6964-S
Package Type
28 Pins, SOP, 300mil
Top Code
PT6964-S
PIN DESCRIPTION
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 Input Pin
This pin inputs serial data at the rising edge of the shift clock
(starting from the lower bit)
Data Output Pin (N-Channel, Open-Drain)
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 / Grid Output Pins
Ground Pin
Grid Output Pins
Pin No.
1
DI/O
CLK
STB
K1 ~ K2
VDD
SG1/KS1 ~ SG10/KS10
SG12/GR7 ~ SG14/GR5
GND
GR4 ~ GR1
I/O
I
I
I
-
O
O
-
O
2
3
4
5, 6
7, 21
8 ~ 17
18 ~ 20
22, 25, 28
23, 24,
26, 27,
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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
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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 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 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
-
-
-
-
b1
LSB
b0
Not Relevant
Display mode settings:
00: 4 digits, 13 segments
01: 5 digits, 12 segments
10: 6 digits, 11 segments
11: 7 digits, 10 segments
COMMANDS 2: DATA SETTING COMMANDS
The Data Setting Commands executes the Data Write or Data Read Modes for PT6964. The data Setting Command, the
bits 5 and 6 (b4, b5) are ignored, 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
-
-
b3
b2
b1
LSB
b0
Not Relevant
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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模拟与混合信号
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