PDF NJU3426 Data sheet ( Hoja de datos )

Número de pieza	NJU3426
Descripción	16 segments 14 digits / QFP48-P1
Fabricantes	JRC
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No Preview Available ! www.DataSheet4U.com NJU3426 16-SEGMENT X 14-Digit VFD CONTROLLER / DRIVER GENERAL DESCRIPTION The NJU3426 is a VFD (Vacuum Fluorescent Display) controller/driver to dynamically drive up to 16 segments x 14 digits. It consists of display data RAM, an address counter, command registers, a serial interface and high voltage drivers. The NJU3426 features the direct connection to MPU and the high voltage drivers of 45V well-suited for various VFD displays. PACKAGE OUTLINE NJU3426FP1 FEATURES Directly Drives 16-segment x 14-digit High VFD Driving Voltage Display Shift Function : \|VDD-VFDP\|≤45V Programmable Duty Ratio for Timing Signal :2/16, 4/16, 6/16, 8/16, 10/16, 12/16, 14/16, 15/16 duty Display ON/OFF Control Function Display Data RAM : 30 x 8-bit Built-in Oscillator (External Ceramic Resonator or External Resistor or External Clock) 8-bit Serial Interface Power-ON Reset Function Operating Voltage : 3.3V / 5.0V C-MOS Technology Package Outline :QFP48-P1 BLOCK DIAGRAM S0 to S15 T0 to T13 VDD VSS VFDP High Voltage Driver Segment Data Latch High Voltage Driver Timing Counter Display RAM 30 x8-bit Duty Counter Timing Counter Instruction Decoder OSC XT XTb SI SCK Serial Buffer CSb REST RSTb Ver.2003-09-02 -1- 1 page www.DataSheet4U.com NJU3426 (3) COMMAND REGISTER 2 The “Command register 2” is used for setting the “Initial character address”, which corresponds to the T0 pin. When the upper 2 bits (B7 and B6) of the 1st word is “0,1”, the lower 4 bits (B3 to B0) are interpreted as command data and stored in the “Command register 2”. The contents of the “Command register 2” are initialized to the default values by the power-ON reset or the reset signal, as shown below. DEFAULT VALUES OF COMMAND REGISTER 2 • Initial character address : C1 (0,0,0,1) B7 B6 B5 B4 B3 B2 B1 B0 0 1 * * DS3 DS2 DS1 DS0 Recognition data Initial character address :don’t care DS3 DS2 DS1 DS0 0 000 0 001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 Initial character address C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 Prohibited Ver.2003-09-02 -5- 5 Page www.DataSheet4U.com NJU3426 • DC characteristics 2 (VDD=3.3V, VSS=0V, Ta=-40 to 85°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT Operating voltage “H” level input voltage “L” level input voltage Input off leak current Display output current VDD VDD terminal VIH XT, RSTb, CSb, SCK, SI terminals VIL IIZ CSb, SCK, SI terminals VDD=3.6V, VI=0 or 3.6V S0 to S15 VDD=3.0V, IOH terminals T0 to T13 VFDP=VDD-40V, VOH=VDD-1.5V terminals 3.0 0.8VDD 3.6 0.2VDD ±1 V V µA -2 -4 mA -4.5 -9 mA Pull-up resistance Pull-down resistance RUR RDST RSTb terminal, Ta=25°C, VI=VSS S0 to S15, T0 to T13 terminals, Ta=25°C VI=VDD, VFDP=VDD-40V VSS terminal, All Segment/Timing output terminals 100 60 280 kΩ 160 kΩ Logic operating current ISS open, RSTb terminal open, Ceramic resonator:1MHz, 0.8 1.5 mA All Segment output OFF and All Timing output OFF Display operating current VFDP terminal, VFDP=VDD-40V, IFDP Ceramic resonator:1MHz, All Segment/Timing output ON 10 15 mA • AC characteristics 2 PARAMETER Operating oscillation frequency CR oscillation frequency External clock Input Rise time, Fall time Serial input data setup time Serial input data hold time Serial clock frequency Serial clock interval time Reset palse width Power rise time SYMBOL fXT fCR tCLH, tCLL tSIS tSIH fSCK tSCI tRSTb tR CONDITIONS Fig. 1 Ta=25°C Rf=18kΩ Fig. 2 Fig. 2 Fig. 2 Fig. 3 Fig. 3 Fig. 4 Fig. 5 (VDD=3.3V, VSS=0V, Ta=-40 to 85°C) MIN TYP MAX UNIT 0.8 2 MHZ 0.85 1 1.15 MHz 250 ) ns 70 ns 70 ns 0.8 MHZ 10 µs 20 µs 0.05 5 ms ) Noises on SCK during rise time or fall time may cause malfunctions. Testing samples in the application is recommended. Ver.2003-09-02 - 11 - 11 Page

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