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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: 886-66296288Fax: 886-29174598 http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6964
APPLICATION CIRCUIT
Notes: 1. The capacitor (0.1F) 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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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, October 2009
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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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PT6964
PT6964 KEY MATRIX & KEY INPUT DATA STORAGE RAM
PT6964 Key Matrix consists of 10 x 2 array as shown below:
Each data entered by each key is stored as follows and read by a READ Command, starting from the last significant bit. When the most significant bit of the data (b7) has been read, the least significant bit of the next data (b0) is read. K1...........................K2 K1...........................K2 SG1/KS1 SG2/KS2 x SG3/KS3 SG4/KS4 x Reading SG5/KS5 SG6/KS6 x Sequence SG7/KS7 SG8/KS8 x SG9/KS9 SG10/KS10 x b0...........................b1 b3.............................b4 b6...........................b7
Note: b6 and b7 do not care.
COMMANDS 3: ADDRESS SETTING COMMANDS
Address Setting Commands are used to set the address of the display memory. The address is considered valid if it has a value of 00H to 0DH. If the address is set to 0EH or higher, the data is ignored until a valid address is set. When power is turned ON, the address is set at 00H. Please refer to the diagram below. MSB 1 1 b3 b2 b1 LSB b0
Not relevant
Address: 00H to 0DH
DISPLAY MODE AND RAM ADDRESS
Data transmitted from an external device to PT6964 via the serial interface are stored in the Display RAM and are assigned addresses. The RAM addresses of PT6964 are given below in 8 bits unit. SG1 00HL 02HL 04HL 06HL 08HL 0AHL 0CHL SG4 SG5 00HU 02HU 04HU 06HU 08HU 0AHU 0CHU b0 xxHL Lower 4 bits
Note: X = Not relevant
SG8
SG9
SG10 01HL 03HL 05HL 07HL 09HL 0BHL 0DHL b3 b4
X -
SG12
SG13 01HU 03HU 05HU 07HU 09HU 0BHU 0DHU b7
SG14 DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7
xxHU Higher 4 bits
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PT6964
COMMAND 4: DISPLAY CONTROL COMMANDS
The Display Control Commands are used to turn ON or OFF a display. It also used to set the pulse width. Please refer to the diagram below. When the power is turned ON, a 1/16 pulse width is selected and the displayed is turned OFF (the key scanning is started). MSB 1 0 b3 b2 b1 LSB b0
Not relevant
Dimming quantity settings: 000: Pulse width=1/16 001: Pulse width=2/16 010: Pulse width=4/16 011: Pulse width=10/16 100: Pulse width=11/16 101: Pulse width=12/16 110: Pulse width=13/16 111: Pulse width=14/16 Display settings: 0: Display off (Key scan continues) 1: Display on
SCANNING AND DISPLAY TIMING
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PT6964
SERIAL COMMUNICATION FORMAT
The following diagram shows the PT6964 serial communication format. The DI/O Pin is an N-channel, open-drain output pin, therefore, it is highly recommended that an external pull-up resistor (1K to 10K) must be connected to DI/O.
RECEPTION (DATA/COMMAND WRITE)
TRANSMISSION (DATA READ)
where: twait (waiting time) 1s It must be noted that when the data is read, the waiting time (twait) between the rising of the eighth clock that has set the command and the falling of the first clock that has read the data is greater or equal to 1s.
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PT6964
SWITCHING CHARACTERISTIC WAVEFORM
PT6964 Switching Characteristics Waveform is given below.
where: fosc = Oscillation Frequency PWSTB (Strobe Pulse Width) 1s tsetup (Data Setup Time) 100ns t TZH (Segment Rise Time) 1s tTZL (Grid Fall Time) 1s tPZL (Propagation Delay Time) 100ns
Note: Test Condition Under tTHZ (Pull low resistor=10K, Loading capacitor=300pF) tTLZ (Pull high resistor=10K, Loading capacitor=300pF)
PWCLK (Clock Pulse Width) 400ns tCLK-STB (Clock - Strobe Time) 1s thold (Data Hold Time) 100ns t THZ (Segment Fall Time) 10s tTLZ (Grid Rise Time) 10 s tPLZ (Propagation Delay Time) 300ns
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PT6964
APPLICATIONS
Display memory is updated by incrementing addresses. Please refer to the following diagram.
where: Command 1: Display mode setting command Command 2: Data setting command Command 3: Address setting command Data 1 to n: Transfer display data (14 bytes max.) Command 4: Display control command The following diagram shows the waveforms when updating specific addresses.
where: Command 2: Data setting command Command 3: Address setting command Data: Data display data
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PT6964
RECOMMENDED SOFTWARE FLOWCHART
Notes: 1. Command 1: Display Mode Commands 2. Command 2: Data Setting Commands 3. Command 3: Address Setting Commands 4. Command 4: Display Control Commands 5. When IC power is applied for the first time, the content of the Display RAM is not defined; thus, it is strongly suggested that the contents of the Display RAM be cleared during the initial setting.
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PT6964
SOP 28 (300MIL) THERMAL PERFORMANCE IN STILL AIR
JUNCTION TEMPERATURE: 100
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PT6964
ABSOLUTE MAXIMUM RATING
(Unless otherwise stated, Ta=25, GND=0V) Parameter Supply voltage Logic input voltage Driver output current Maximum driver output current/total Operating temperature Storage temperature Symbol VDD VI IOLGR IOHSG ITOTAL Topr Tstg Rating -0.3 to +7 -0.3 to VDD+0.3 +200 -50 400 -40 ~ +85 -65 ~ +150 Unit V V mA mA mA
RECOMMENDED OPERATING RANGE
(Unless otherwise stated, Ta=25, GND=0V) Parameter Logic supply voltage Dynamic current (see Note) High-level input voltage Low-level input voltage Symbol VDD IDDdyn VIH VIL Min. 4.5 0.8VDD 0 Typ. 5 Max. 5.5 5 VDD 0.3VDD Unit V mA V V
Note: Test Condition: Set Display Control Commands=80H (Display Turn OFF State & under no load)
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, VDD=5V, GND=0V, Ta=25) Parameter Symbol Test Condition VO=VDD-2V IOHSG(1) SG1/KS1 to SG10/KS10, SG12/GR7 to SG14/GR5 High-level output current VO=VDD-3V IOHSG(2) SG1/KS1 to SG10/KS10, SG12/GR7 to SG14/GR5 VO=0.3V Low-level output current IOLGR GR1 to GR4 SG14/GR5 to SG12/GR7 Low-level output current IOLDI/O VO=0.4V VO=VDD-3V Segment high-level output current ITOLSG SG1/KS1 to SG10/KS10, tolerance SG12/GR7 to SG14/GR5 High-level input voltage VIH Low-level input voltage VIL Oscillation frequency fosc R=51K K1 to K3 pull down resistor RKN K1 to K2; VDD=5V Min. -20 -25 100 4 0.8VDD 0 350 40 Typ. -25 -30 140 500 Max. -40 -50 5 5 0.3VDD 650 100 Unit mA mA mA mA % V V KHz K
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PT6964
PACKAGE INFORMATION
28 PINS, SOP, 300MIL
Symbol A A1 b c D E E1 e L
Notes: 1. All controlling dimensions are in millimeters. 2. Refer to JEDEC MS-012AE
Min. 0.31 0.20
0.38 0
Nom. 17.90 BSC 10.30 BSC 7.50 BSC 1.27 BSC -
Max. 2.65 0.30 0.51 0.33
1.27 8
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PT6964 IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw
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