STFPC320 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STFPC320
STMicroelectronics
STFPC320 Datasheet PDF : 78 Pages
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STFPC320 typical application circuit
18 STFPC320 typical application circuit
Figure 56. Typical application circuit
R3
R4
12 x 2
KEYBOARD
D1
D12
STFPC320
VDD
RPU
KEY1 KEY2 SEG1/K1
VDD
SEG12/K12
VFD
Ef
+
C1 C2
ROSC
8 Grids/Segments
S13/G16 ~ S20/G9
<1
<2
<
<
3
4
< 54
<6
<7
<8
<9
< 10
OSC
PIN_AV8
SCL
SDA
IR_DATA_IN
READY
SW1, SW2
IRQ_N/SQW
MUTE
STBY
STFPC320
VSS
8 Grids
G1 ~ G8
R1
LED1
R2
LED2
R3
LED3
R4
LED4
GND
<1
< 12
< 13
VDD 3.3V±10%
VSS
GND
RPD
+
+
C3 C4
VDD
GND
GND
CL1
CL2
+
ROSC = 33kΩ (±1%) for oscillator resistor;
R1 ~ R4 = 0.75 ~ 1.2kΩ;
C2 = 0.01 ~ 0.1µF-25V ceramic;
C3 = 0.01 ~ 0.1µF-63V ceramic;
R3, R4 = 10kΩ for external keyboard pull-down resistor; C4 = 33µF-63V electrolytic;
RPU = 4.7kΩ for external pull-up resistor on SDA, SCL; D1 ~ D12 = 1N4148;
RPU = 10kΩ for external pull-up resistor on IRQ_N/SQW; Ef = filament voltage according to the VFD specs;
RPD = 10kΩ for external pull-down resistor on READY; VDD = 3.3V ±10%;
CL1, CL2 = 25pF;
VSS = down to VDD - 33.3V.
C1 = 33µF-25V electrolytic;
74/78
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