W66880CF VFD CONTROLLER/DRIVER GENERAL DESCRIPTION • • • • • 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 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. FEATURES APPLICATIONS • Flexible display modes (4 to 8 grids) − 4 grids × 16 segments to 8 grids × 14 segments • 6 × 4 matrix key scanning • 8 steps dimming circuit VFD display driving and panel function control Din Dout 16 Segment Driver 14 STB Sg[1:14] 2 VDD Data switch 2 V SS LED1 LED2 LED3 LED4 V DD G1 G2 G3 G4 42 41 40 39 38 37 36 35 34 OSC 43 Sg16/G7 SW4 4 30 Sg15/G8 Dout 5 29 Sg14 Din 6 28 W66880 VSS 7 27 Sg13 VEE CLK 8 26 Sg12 STB 9 25 Sg11 Key1 10 24 Sg10 Key2 11 23 Sg9 16 17 18 19 20 21 22 Sg3/KS3 Sg4/KS4 Sg5/KS5 Sg6/KS6 Sg7 Sg8 G[1:6] Sg2/KS2 Grid driver 15 Sg[15:16] /G[8:7] DD Multiplexed driver Sg1/KS1 6 4 31 2 8 Key[1:4] 3 14 Scan Timing Generator G6 SW3 13 OSC 32 12 OSC 33 2 V R 1 Key4 Display memory 16 bits x 8 words key data memory 4-bit input latch 4-bit output latch 4 4 SW[1:4] Winbond Corporate Headquarters Tel : 886-3-5790666 Fax : 886-3-5796139 Details are subject to change without notice. Apr. 1999 LED[1:4] VDD Taipei Sales Office Tel : 886-2-7190505 Fax : 886-2-7197502 All VSS VEE Winbond Electronics North America Corp. Tel : 1-408-9436666 Fax : 1-408-9436668 trademarks are property of their respective holders. G5 SW1 SW2 Key3 Serial interface CLK 44 Functional Block Pin Configuration Winbond Electronics H.K. Ltd. Tel : 852-27513100 Fax : 852-27552064