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STFPC320 Datasheet(PDF) 74 Page - STMicroelectronics

Part # STFPC320
Description  Front panel controller/driver with standby power management and real-time clock
PDF  78 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STFPC320 Datasheet(HTML) 74 Page - STMicroelectronics

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STFPC320 typical application circuit
STFPC320
74/78
18
STFPC320 typical application circuit
Figure 56.
Typical application circuit
VDD
R
OSC
VDD
VDD
OSC
PIN_AV8
12 x 2
KEYBOARD
Ef
KEY1
KEY2
SEG1/K1
S13/G16 ~ S20/G9
G1 ~ G8
GND
VSS
SCL
8 Grids/Segments
8 Grids
R4
R3
STFPC320
R1
R2
C1
VFD
SEG12/K12
READY
SW1, SW2
MUTE
STBY
IR_DATA_IN
LED1
LED2
<
<
<
<
<
<
<
<
<
<
<
VSS
VDD 3.3V±10%
GND
GND
1
2
3
4
6
7
8
10
1
12
13
C2
C3
C4
+
D1
D12
+
<
9
IRQ_N/SQW
<
4
5
SDA
R3
LED3
R4
LED4
R
PU
C
L1
+
C
L2
+
GND
R
PD
VDD
R
OSC
VDD
VDD
OSC
PIN_AV8
12 x 2
KEYBOARD
Ef
KEY1
KEY2
SEG1/K1
S13/G16 ~ S20/G9
G1 ~ G8
GND
VSS
SCL
8 Grids/Segments
8 Grids
R4
R3
STFPC320
R1
R2
C1
VFD
SEG12/K12
READY
SW1, SW2
MUTE
STBY
IR_DATA_IN
LED1
LED2
<
<
<
<
<
<
<
<
<
<
<
VSS
VDD 3.3V±10%
GND
GND
1
2
3
4
6
7
8
10
1
12
13
C2
C3
C4
+
D1
D12
+
<
9
IRQ_N/SQW
<
4
5
SDA
R3
LED3
R4
LED4
R
PU
C
L1
+
C
L1
+
C
L2
+
GND
R
PD
ROSC = 33kΩ (±1%) for oscillator resistor;
R1 ~ R4 = 0.75 ~ 1.2k
Ω;
R3, R4 = 10k
Ω for external keyboard pull-down resistor;
RPU = 4.7kΩ for external pull-up resistor on SDA, SCL;
RPU = 10kΩ for external pull-up resistor on IRQ_N/SQW;
RPD = 10kΩ for external pull-down resistor on READY;
CL1, CL2 = 25pF;
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 to the VFD specs;
VDD = 3.3V ±10%;
VSS = down to VDD - 33.3V.



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