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STFPC311 Datasheet(PDF) 35 Page - STMicroelectronics |
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STFPC311 Datasheet(HTML) 35 Page - STMicroelectronics |
35 / 39 page STFPC311 14 Typical application diagram 35/39 14 Typical application diagram ● ROSC = 33kΩ ± 1% for oscillator resistor; ● R1 ~ R4 = 0.75 ~ 1.2k Ω; ● R5, R6 = 10k Ω for external keyboard pull-down resistor; ● C1 = 33µF-25V electrolytic; ● C2 = 0.01 ~ 0.1µF-25V ceramic; ● C3 = 0.01 ~ 0.1µF-63V ceramic; ● C4 = 33µF-63V electrolytic; ● D1 ~ D12 = 1N4148; ● Ef = filament voltage according with the VFD specs; ● VDD = 3.3V ±10%; * VSS = down to VDD – 33.3V. Figure 33. Typical application circuit V DD R OSC V DD VDD OSC STB CLK 12 x 2 KEYBOARD Ef KEY1 KEY2 SEG1/K1 S13/G16 ~ S20/G9 G1 ~ G8 VSS VSS DIN 8 Grids/Segments 8 Grids R6 R5 STFPC311 R1 R2 C1 VFD SEG12/K12 READY/STBY_n NC MUTE STBY IR_DATA_IN LED1 LED2 < < < < < < < < < < < V SS* -30 V V DD 3.3V ± 0 .3 V GND GND 1 2 3 6 7 9 10 11 12 C2 C3 C4 + D1 D12 + 8 4 5 R3 LED3 R4 LED4 DOUT < V DD R OSC V DD VDD OSC STB CLK 12 x 2 KEYBOARD Ef KEY1 KEY2 SEG1/K1 S13/G16 ~ S20/G9 G1 ~ G8 VSS VSS DIN 8 Grids/Segments 8 Grids R6 R5 STFPC311 R1 R2 C1 VFD SEG12/K12 READY/STBY_n NC MUTE STBY IR_DATA_IN LED1 LED2 < < < < < < < < < < < V SS* -30 V V DD 3.3V ± 0 .3 V GND GND 1 2 3 6 7 9 10 11 12 C2 C3 C4 + D1 D12 + 8 4 5 R3 LED3 R4 LED4 DOUT < |
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