PT6961 LED Driver IC DESCRIPTION PT6961 is an LED Controller driven on a 1/7 to 1/8 duty factor. 11 segment output lines, 6 grid output lines, 1 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 PT6961 via a four-line serial interface. Housed in a 32-pin SOP, PT6961 pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantages. FEATURES • CMOS technology • Low power consumption • Multiple display modes (12 segments, 6 grids to 11 segments, 7 grids) • Key scanning (10 x 3 Matrix) • 8-Step dimming circuitry • Serial interface for Clock, Data Input, Data Output, Strobe Pins • Available in 32-pin, 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 PT6961 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 PT6961 chip. 2. It is strongly suggested that the NC pin (pins 13) be connected to the GND. 3. The PT6961 power supply is separate from the application system power supply. COMMON CATHODE TYPE LED PANEL V1.6 2 May 2010 PT6961 ORDER INFORMATION Valid Part Number PT6961 Package Type 32pins, SOP, 300mil Top Code PT6961 PIN DESCRIPTION V1.6 3 May 2010 PT6961 PIN DESCRIPTION Pin Name I/O OSC I DOUT O DIN I CLK I STB I K1 ~ K3 I VDD - SG1/KS1 ~ SG10/KS10 O NC SG11 SG12/GR7 O O 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 No Connection Segment Output pins (P-Channel, open drain) Segment / Grid Output Pins GR6 ~ GR1 O Grid Output Pins GND - Ground Pin V1.6 Description 4 Pin No. 1 2 3 4 5 6, 7, 8 9, 25 10 ~ 12 14 ~ 20 13 21 22 23, 24, 27, 28, 30, 31 26, 29, 32 May 2010 PT6961 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 K3 OUTPUT PINS: DOUT, GR1 TO GR4 OUTPUT PINS: SG1 TO SG11 OUTPUT PINS: GR5, GR6 AND SG12/GR7 V1.6 5 May 2010 PT6961 FUNCTION DESCRIPTION COMMANDS A command is the first byte (b0 to b7) inputted to PT6961 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 PT6961 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 PT6961 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 (12 to 11 segments, 6 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: 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 PT6961. 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 V1.6 6 May 2010 PT6961 PT6961 KEY MATRIX & KEY INPUT DATA STORAGE RAM PT6961 Key Matrix consists of 10 x 3 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…………………K3 SG1/KS1 SG3/KS3 SG5/KS5 SG7/KS7 SG9/KS9 b0………………….b2 K1…………………….K3 SG2/KS2 SG4/KS4 SG6/KS6 SG8/KS8 SG10/KS10 b3…………………….b5 x x x x x b6………………….b7 Reading Sequence 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 0 0 b3 b2 b1 LSB b0 Address: 00H to 0DH DISPLAY MODE AND RAM ADDRESS Data transmitted from an external device to PT6961 via the serial interface are stored in the Display RAM and are assigned addresses. The RAM addresses of PT6961 are given below in 8 bits unit. SG1 SG4 SG5 00HL 02HL 04HL 06HL 08HL 0AHL 0CHL SG8 SG9 00HU 02HU 04HU 06HU 08HU 0AHU 0CHU b0 01HL 03HL 05HL 07HL 09HL 0BHL 0DHL b3 xxHL Lower 4 bits V1.6 SG12 SG13 SG14 01HU DIG1 03HU DIG2 05HU DIG3 07HU DIG4 09HU DIG5 0BHU DIG6 0DHU DIG7 b4 b7 xxHU Higher 4 bits 7 May 2010 PT6961 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 0 0 b3 b2 b1 LSB b0 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 V1.6 8 May 2010 PT6961 SCANNING AND DISPLAY TIMING V1.6 9 May 2010 PT6961 SERIAL COMMUNICATION FORMAT The following diagram shows the PT6961 serial communication format. The DOUT Pin is an N-channel, open-drain output pin; therefore, it is highly recommended that an external pull-up resistor (1 KΩ to 10 KΩ) must be connected to DOUT. RECEPTION (DATA/COMMAND WRITE) TRANSMISSION (DATA READ) where: twait (waiting time) ≥ 1µs 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 1µs. V1.6 10 May 2010 PT6961 SWITCHING CHARACTERISTIC WAVEFORM PT6961 Switching Characteristics Waveform is given below. where: PWCLK (Clock Pulse Width) ≥ 400ns tsetup (Data Setup Time) ≥100ns tCLK-STB (Clock – Strobe Time) ≥ 1µs tTZH (Rise Time) ≤ 1 µs fosc = Oscillation Frequency tTZL ≤ 1µs PWSTB (Strobe Pulse Width) ≥ 1µs thold (Data Hold Time) ≥ 100ns tTHZ (Fall Time) ≤ 10µs tPZL (Propagation Delay Time) ≤ 100ns tPLZ (Propagation Delay Time) ≤ 300ns tTLZ ≤ 10 µs Note: Test Condition Under tTHZ (Pull low resistor) = 10KΩ, Loading capacitor = 300pF tTLZ (Pull high resistor) = 10KΩ, Loading capacitor = 300pF V1.6 11 May 2010 PT6961 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: Display data V1.6 12 May 2010 PT6961 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 contents of the Display RAM are not defined; thus, it is strongly suggested that the contents of the Display RAM be cleared during the initial setting. V1.6 13 May 2010 PT6961 SOP 32 (300MIL) THERMAL PERFORMANCE IN STILL AIR JUNCTION TEMPERATURE: 100°C V1.6 14 May 2010 PT6961 ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, Ta=25℃, GND=0V) Parameter Symbol Supply voltage VDD Logic input voltage VI IOLGR IOHSG ITOTAL Driver output current Maximum driver output current/total Ratings Unit -0.5 to +7 V -0.5 to VDD+0.5 +250 -50 400 V mA mA mA Operating temperature Topr -40 ~ +85 °C Storage temperature Tstg -65 ~ +150 °C RECOMMENDED OPERATING RANGE (Unless otherwise specified, Topr=25℃, GND=0V) Parameter Symbol Logic supply voltage VDD Dynamic current (see Note) IDDdyn High-level input voltage VIH Low-level input voltage VIL Condition VDD VDD Min. 3 - Typ. 5 - Max. 5.5 5 VDD=5V 0.8 VDD - VDD VDD=3V 0.8 VDD - VDD VDD=5V 0 - 0.3 VDD VDD=3V 0 - 0.3 Unit V mA V V Note: Test Condition: Set Display Control Commands = 80H (Display Turn OFF State & under no load) V1.6 15 May 2010 PT6961 ELECTRICAL CHARACTERISTICS (Unless otherwise stated, VDD =5V, GND=0V, Ta=25°C) Parameter Symbol Test Condition VO= VDD -2V IOHSG(1) SG1 to SG11, SG12/GR7 High-level output current VO= VDD -3V IOHSG(2) SG1 to SG11, SG12/GR7 VO=0.3V Low-level output current IOLGR GR1 to GR6, SG12/GR7 Low-level output current IOLDOUT VO=0.4V VO= VDD -3V Segment high-level ITOLSG SG1 to SG11, SG12/GR7 output current tolerance High-level input voltage VIH Low-level input voltage VIL - Min. Typ. Max. Unit -20 -25 -40 mA -25 -30 -50 mA 100 140 - mA 4 - - mA - - ±5 % 0.8VDD 0 - 5 0.3VDD V V Oscillation frequency fosc R=51KΩ 350 500 650 KHz K1 to K3 pull down resistor RKN K1 to K3, VDD =5V 40 - 100 KΩ (Unless otherwise stated, VDD =3V, GND=0V, Ta=25°C) Parameter Symbol Test Condition High-level output current Low-level output current Low-level output current Segment high-level output current tolerance High-level input voltage Low-level input voltage IOHSG VO=VDD-2V SG1 to SG11, SG12/GR7 VO=0.3V GR1 to GR6, SG12/GR7 IOLDOUT VO=0.4V VO= VDD -2V ITOLSG SG1 to SG11, SG12/GR7 VIH VIL IOLGR Min. Typ. Max. Unit -9 -12 -20 mA 80 100 - mA 3 - - mA - - ±5 % 0.8VDD 0 - VDD 0.3 V V Oscillation frequency fosc R=33KΩ 350 500 650 KHz K1 to K3 pull down resistor RKN K1 to K3, VDD=3V 90 - 180 KΩ V1.6 16 May 2010 PT6961 PACKAGE INFORMATION 32 PINS, SOP, 300 MIL Symbol A A1 b c e D E E1 L θ Min. 0.10 0.31 0.20 Typ. 1.27 BSC. - 20.32 7.40 10.00 0.38 0 Max. 2.65 0.51 0.33 20.73 7.60 10.65 1.27 8 Notes: 1. Refer to JEDEC MO-119 AC 2. Unit: mm V1.6 17 May 2010 PT6961 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 V1.6 18 May 2010