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| W66880CF VFD CONTROLLER/DRIVER GENERAL DESCRIPTION The W66880CF is a VFD (Vacuum Fluorescent Display) controller/ driver. It can be programmed to drive a VFD with 4 grids by 16 segments to 8 grids by 14 segments. The W66880CF also includes a 24-key key scan circuit and four LED ports and four general purpose input ports. Data communication with the W66880CF is via a serial interface. * * * * * 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 * 44-pin plastic QFP package FEATURES * Flexible display modes (4 to 8 grids) - 4 grids x 16 segments to 8 grids x 14 segments * 6 x 4 matrix key scanning * 8 steps dimming circuit APPLICATIONS VFD display driving and panel function control Functional Block Pin Configuration LED1 LED2 LED3 LED4 OSC VDD V SS G2 G1 G3 35 44 43 42 41 40 39 38 37 36 Din Dout CLK STB 2 34 G4 SW1 SW2 1 2 3 4 5 6 7 8 9 33 32 31 30 G5 G6 Sg16/G7 Sg15/G8 Sg14 Sg13 VEE Sg12 Sg11 Sg10 Sg9 Serial interface Display memory 16 bits x 8 words SW3 16 14 Segment Driver SW4 Sg[1:14] Dout Din VSS W66880 29 28 27 26 25 24 23 VDD R Data switch OSC Scan Timing Generator 8 6 2 2 CLK STB Key1 10 Key2 11 12 13 14 15 16 17 18 19 20 21 22 OSC Sg2/KS2 Sg3/KS3 Sg4/KS4 Sg5/KS5 Sg6/KS6 Multiplexed driver Sg1/KS1 Sg[15:16] /G[8:7] Key3 Key4 DD Sg7 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 Details are subject to change without notice. Apr. 1999 Taipei Sales Office Tel : 886-2-7190505 Fax : 886-2-7197502 All Winbond Electronics North America Corp. Tel : 1-408-9436666 Fax : 1-408-9436668 Winbond Electronics H.K. Ltd. Tel : 852-27513100 Fax : 852-27552064 trademarks are property of their respective holders. Sg8 V |
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