STFPC311 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STFPC311 Datasheet PDF : 39 Pages
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STFPC311
14 Typical application diagram
Figure 33. Typical application circuit
R5
R6
D1
12 x 2
KEYBOARD
14 Typical application diagram
D12
VDD
KEY1 KEY2 SEG1/K1
SEG12/K12
VDD
+
VFD
Ef
8 Grids/Segments
C1 C2
<1
<2
<
<
3
4
<5
<6
<7
<8
<9
R OSC
OSC
STB
CLK
D IN
DOUT
IR _ D A T A _ IN
R E A D Y /S T B Y _ n
NC
MUTE
STBY
STFPC311
V SS
S13/G16 ~ S20/G9
G1 ~ G8
8 Grids
R1
LED1
R2
LED2
R3
LED3
R4
LED4
VSS
< 10
< 11
< 12
VDD 3.3V±0.3V
VSS* -30V
GND
VDD
C3 C4
+
GND
● ROSC = 33kΩ ± 1% for oscillator resistor;
● R1 ~ R4 = 0.75 ~ 1.2kΩ;
● R5, R6 = 10kΩ 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.
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