STFPC320 STMicroelectronics, STFPC320 Datasheet - Page 71

• Manufacturer Part Number: STFPC320
• Description: Front Panel Controller/driver With Standby Power Management And Real-time Clock
• Manufacturer: STMicroelectronics

STFPC320
18
R
R1 ~ R4 = 0.75 ~ 1.2kΩ;
R3, R4 = 10kΩ for external keyboard pull-down resistor;
R
R
R
C
C1 = 33µF-25V electrolytic;
Figure 31. Typical application circuit
OSC
PU
PU
PD
L1
C1
C1
+
+
<
<
<
<
VDD
VDD
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
<
, C
= 4.7kΩ for external pull-up resistor on SDA, SCL;
= 10kΩ for external pull-up resistor on IRQ_N/SQW;
= 10kΩ for external pull-down resistor on READY;
= 33kΩ (±1%) for oscillator resistor;
L2
C2
C2
= 25pF;
10
10
12
12
13
13
4
4
5
5
9
9
1
1
2
2
3
3
4
4
6
6
7
7
8
8
1
1
GND
GND
STFPC320 typical application circuit
VDD 3.3V±10%
VDD 3.3V±10%
R
R
GND
GND
VSS
VSS
PU
PU
R3
R3
R4
R4
R
R
R
R
GND
GND
OSC
OSC
PD
PD
OSC
OSC
PIN_AV8
PIN_AV8
SCL
SCL
SDA
SDA
VDD
VDD
IR_DATA_IN
IR_DATA_IN
SW1, SW2
SW1, SW2
IRQ_N/SQW
IRQ_N/SQW
MUTE
MUTE
STBY
STBY
KEY1
KEY1
READY
READY
KEY2
KEY2
D1
D1
SEG1/K1
SEG1/K1
C
C
C
+
+
+
L1
L1
L1
STFPC320
STFPC320
C
C
L2
L2
+
+
KEYBOARD
KEYBOARD
12 x 2
12 x 2
VSS
VSS
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.
S13/G16 ~ S20/G9
S13/G16 ~ S20/G9
C3
C3
GND
GND
SEG12/K12
SEG12/K12
STFPC320 typical application circuit
C4
C4
+
+
G1 ~ G8
G1 ~ G8
LED1
LED1
LED2
LED2
LED3
LED3
LED4
LED4
D12
D12
VDD
VDD
8 Grids/Segments
8 Grids/Segments
8 Grids
8 Grids
R1
R1
R2
R2
R3
R3
R4
R4
VFD
VFD
71/75
Ef
Ef