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| W66881CF VFD CONTROLLER/DRIVER GENERAL DESCRIPTION The W66881CF is a VFD (Vacuum Fluorescent Display) controller/driver. It has two operation configurations: (1) 8x16 Configuration which replaces the W66880CF without the necessary of changing the original driver program for W66880CF, and (2) 8x20 Configuration which provides more segment drivers, and can be programmed to drive a VFD from 4 grids by 20 segments to 8 grids by 18 segments. The W66881CF also includes a 24-key key scan circuit, four LED ports and four general purpose input ports. Data communication with the W66881CF is via a serial interface. * * * * * * * 6 x 4 matrix key scanning 8 steps dimming circuit High voltage output (VDD - VEE = 30V max) Four 15 mA LED ports Four general-purpose input port Internal driver output pull-down resisters Only one external resister is needed for the on chip oscillator * Simple serial interface * Driver program compatible with W66880CF's (8x16 only ) * 48-pin plastic QFP package FEATURES * Flexible display modes (4 to 8 grids) - 4 grids x 20 segments to 8 grids x 18 segments APPLICATIONS VFD display driving and panel function control Functional Block (8x20 configuration) Pin Configuration LED1 LED2 LED3 LED4 V DD OSC V SS G4 38 G1 G2 Din Dout CLK STB 2 48 47 46 45 44 43 42 41 40 39 G3 Serial interface Display memory 20 bits x 8 words SW1 1 2 3 4 5 6 7 8 9 10 11 12 37 G5 36 35 34 33 32 G6 Sg20/G7 Sg19/G8 Sg18 Sg17 Sg16 Sg15 Sg14 Sg13 V EE 20 18 Segment Driver SW2 Sg[1:18] 8x20 Configuration SW3 SW4 Dout Din VSS CLK VDD R Data switch OSC Scan Timing Generator 8 6 2 2 W66881 (8x20 Configuration) 31 30 29 28 27 26 25 OSC STB Key1 13 14 15 16 17 18 19 20 21 22 23 Key4 DD Sg8 Sg1/KS1 Sg9 Sg2/KS2 Sg3/KS3 Sg4/KS4 Sg5/KS5 Key[1:4] 4 key data memory Grid driver 4-bit input latch 4-bit output latch G[1:6] 4 4 SW[1:4] LED[1:4] VDD VSS VEE Winbond Corporate Headquarters Tel : 886-3-5790666 Fax : 886-3-5796139 Taipei Sales Office Tel : 886-2-7190505 Fax : 886-2-7197502 Winbond Electronics North America Corp. Tel : 1-408-9436666 Fax : 1-408-9436668 Winbond Electronics H.K. Ltd. Tel : 852-27513100 Fax : 852-27552064 Apr. 1999 Details are subject to change without notice. All trademarks are property of their respective holders. Sg6/KS6 Sg10 Sg7 V 24 MultiSg[19:20] plexed driver /G[8:7] Key2 Key3 Sg12 Sg11 |
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