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. Fluorescent Display Tube Controller Driver • Logic power supply(VDD): 3.3V±10% / 5.0V±10% • Fluorescent display tube drive power supply (VD|SP): 20V~60V • VFD driver output current (VFD driver output can directly be connected to the fluorescent display tube. No pull-down resistor is required.) • General output port output current - 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 • 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) Tel: 886-66296288 •Fax: 886-29174598 • http://www.princeton.com.tw • 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Tai

BLOCK DIAGRAM V1.0 2 August, 2009

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

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Fluorescent tube anode electrode Fluorescent tube anode electrode Power supply Fluorescent tube grid electrode Power supply Power supply Power supply LED drive control terminals Fluorescent display tube anode electrode drives output. Directly connected to fluorescent display tube. No pull-down resistor is required. IOH>-10.0mA 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...

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