STFPC311(2012) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STFPC311
(Rev.:2012)

Front panel controller/driver with standby power management

STMicroelectronics 

STFPC311

14 Typical application diagram

Typical application diagram

Figure 35. Typical application circuit

R5

R6

12 x 2

KEYBOARD

D1

D12

duct(s) VDD

KEY1 KEY2 SEG1/K1

SEG12/K12

ro VDD

P +

VFD

Ef

8 Grids/Segments

te C1 C2

ole < 1

s < 2

b <

O <

3

4

- < 5

) < 6

t(s < 7

<8

uc < 9

ROSC

OSC

STB

CLK

DIN

DOUT

IR_DATA_IN

READY/STBY_n

NC

MUTE

STBY

STFPC311

VSS

S13/G16 ~ S20/G9

8 Grids

G1 ~ G8

R1

LED1

R2

LED2

R3

LED3

R4

LED4

VSS

rod < 10

< 11

P < 12

VDD 3.3V±0.3V

VSS* -30V

GND

VDD

C3 C4

te +

GND

bsole● ROSC = 33 kΩ ± 1% for oscillator resistor;

O ● R1 ~ R4 = 0.75 ~ 1.2kΩ;

● R5, R6 = 10 kΩ for external keyboard pull-down resistor;

● C1 = 33 µF-25 V electrolytic;

● C2 = 0.01 ~ 0.1 µF - 25 V ceramic;

● C3 = 0.01 ~ 0.1 µF - 63 V ceramic;

● C4 = 33 µF - 63 V electrolytic;

● D1 ~ D12 = 1N4148;

● Ef = filament voltage according with the VFD specs;

● VDD = 3.3V ±10%;

* VSS = down to VDD – 33.3 V

Doc ID 12324 Rev 2

35/39

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