NJU3427

Preliminary www.DataSheet4U.com NJU3427 36 Outputs VFD Controller/Driver GENERAL DESCRIPTION The NJU3427 is a 36-output VFD (Vacuum Fluorescent Display) controller/driver. The NJU3427 consists of high-voltage driving circuit, Timing/ Segment driver select circuit, display data RAM (DDRAM), address counter, instruction register, reset circuit serial interface and oscillator. The direct control from the MPU and high voltage drivers make the NJU3427 well suited for various VFD displays NJU3427F Package FEATURES Display Capability From 20-Seg x16-Timing to 28-Seg x 4-Timing 20mA(VDD=5V) DR0 Pin (ISO1) DR1~DR35 Pins (ISO2) 10mA(VDD=5V) Segment and Timing Driver Configure 4 patterns High VFD Driving Voltage |VDD-VFDP|≤40V Programmable Display Duty Ratio 1/4, 1/8, 1/12 or 1/16 Programmable Timing Signal Duty Ratio 2/16, 4/16, 6/16, 8/16, 10/16, 12/16, 14/16, 15/16 Display ON/OFF Display Data RAM 47x8 bits CR Oscillator External CR and capable of clock input from outside Serial Data Transfer Clock frequency: 2MHz Max. Logic Power Supply 3.0V / 5.0V C-MOS Package QFP52 BLOCK DIAGRAM DR0 DR35 High Voltage Drivers VDD VSS VFDP Timing/Segment Select Segment Data Latch Timing Decoder Duty Counter Timing Counter Instruction Decoder OSC SI SCK CSb Serial Buffer Reset XT XTb RSTb Address Counter Display RAM Ver.2005-10-24 -1- NJU3427 www.DataSheet4U.com Preliminary PIN CONFIGURATION DR35 DR34 DR33 DR32 DR31 DR30 DR29 DR28 DR27 DR26 DR25 28 DR24 27 NC 39 38 37 36 35 34 33 3...