PT6321 Fluorescent Display Tube Controller Driver DESCRIPTION FEATURES The PT6321 is a dot matrix fluorescent display tube controller driver IC which displays characters, numerics and symbols. Dot matrix fluorescent display tube drive signals are generated by serial data sent from a microcontroller. A display system is easily realized by internal ROM and RAM for character display. • Logic power supply(VDD): 3.3V±10% / 5.0V±10% • Fluorescent display tube drive power supply (VDISP): 20V~60V • VFD driver output current (VFD driver output can directly be connected to the fluorescent display tube. No pull-down resistor is required.) - Segment driver (SEG1 to SEG35): -5.0mA (VDISP=60V) - Segment driver (AD1 to AD4): -10.0mA (VDISP=60V) - Grid driver (COM1 to COM24): -20.0mA (VDISP=60V) • General output port output current - Output driver (P1-4): ±1.0mA (VDD=3.3V±10%) ±2.0mA (VDD=5.0V±10%) • Content of display - CGROM: 5x7 dots, 240 types (character data) - CGRAM: 5x7 dots, 16 types (character data) - ADRAM: 24 (display digit) x 4 bits (symbol data) - DCRAM: 24 (display digit) x 8 bits (register for character data display) - General output port: 4 bits (static mode) • Display control function - Display digit: 9 to 24 digits - Display duty (contrast adjustment): 8 stages - All lights ON/OFF • 3 interfaces with microcontroller: DA, /CS, /CP(4 interfaces if /RESET is added) • 1-byte instruction execution (excluding data write to RAM) • Built-in oscillation circuit (external C and R) 80-pin plastic LQFP (LQFP80-P-1414-0.65-K) Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT6321 BLOCK DIAGRAM V1.0 2 August, 2009 PT6321 APPLICATION CIRCUIT Notes: *1. The VDISP voltage depends on the fluorescent display tube used. Adjust the value of the constants R3 and ZD to the VDISP voltage used. *2. The value of R1 & C1 depend on PT6321 supply voltage of VDD (VDD=5V: R1=3.3KΩ, C1=47pF; VDD=3.3V: R1=3.3KΩ, C1=39pF) *3. R2=1KΩ, C2=0.1µF V1.0 3 August, 2009 PT6321 ORDER INFORMATION Valid Part Number PT6321-LQ Package Type 80 Pins, LQFP Top Code PT6321-LQ PIN CONFIGURATION V1.0 4 August, 2009 PT6321 PIN DESCRIPTION Pin Name I/O Connects to AD1~4 O Fluorescent tube anode electrode SEG1~35 O Fluorescent tube anode electrode VDISP1~2 COM1~24 Power supply O PGND1~2 LGND OSC0 Fluorescent tube grid electrode Power supply Power supply I C1, R1 OSC1 /RESET Description Fluorescent display tube anode electrode drives output. Directly connected to fluorescent display tube. No pull-down resistor is required. IOH>–10.0mA 1,2,79,80 Fluorescent display tube anode electrode drives output. Directly connected to fluorescent display tube. No pull-down resistor is required. IOH>–5.0mA VDISP-PGND are power supplies for driving fluorescent tubes Fluorescent display tube grid electrode drives output. Directly connected to fluorescent display tube. No pull-down resistor is required. IOH>–20.0mA High Voltage GND pin Logic GND pin Connect R and C externally. The RC time constant depends on the VDD voltage used. Set the target oscillation frequency to 2 MHz. 3-37 38,78 39-62 63,76 64 65 (RC oscillation circuit) See Application Circuit) O I Pin No Microcontroller or C2, R2 Reset input. Setting this pin to "Low" initializes all the functions. The initial status is as follows. • Address of each RAM….. address "00"H • Data of each RAM….. Content is undefined • Number of display digits….. 24 digits • Contrast adjustment….. 8/16 • All lights ON or OFF….OFF mode • All outputs….. "Low" level 66 67 (Circuit when R and C are connected externally) See application Circuit /CS I Microcontroller /CP I Microcontroller DA I Microcontroller VDD P1~4 V1.0 Power supply O LED drive control terminals Chip select input Setting this pin to "H" disables serial data transfer. Shift clock input. Serial data is shifted on the rising edge of /CP. Serial data input (positive logic). Input from LSB. Logic Voltage Pin General port output. Output of these pins in static operation, so these pins can drive the LED. IOH>–2.0mA 5 68 69 70 71 72-75 August, 2009 PT6321 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 V1.0 6 August, 2009