STFPC311(2012) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STFPC311 Datasheet PDF : 39 Pages
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STFPC311
Pin connections
2.1
Pin description
Table 2.
Pin Nº
Pin description
Symbol
Type
Name and function
1
OSC
I
This is the oscillator input pin. Connect this pin to an external resistor.
2, 3
SW1, SW2
I
General purpose switch input ports.
4
MUTE
O
High level indicates mute status for audio. Low level indicates normal
working. See Note:
there is a typo. Pin5 and name is STBY. Standby output to put the MCU
in low power mode.
5S
TBY
O
It is a command to the main power board. High level indicates stand-by
) 7
ct(s 8, 9
rodu 10
P 1
lete 14 to 25
so 12, 26
Ob 27 to 34
) - 35 to 37
t(s 6, 13,38
uc 39
d 40 to 44
te Pro 45
Obsole 46
GND
KEY1, KEY2
READY
IR_DATA_IN
SEG1/KS1 to
SEG12/KS12
VSS
SEG13/GRID16
to SEG20/GRID9
GRID8 to GRID6
VDD
NC
GRID5 to GRID1
STB
CLK
POWER
I
I
I
O
POWER
O
O
POWER
O
O
I
I
status. Low level indicates normal working. See Note:
Connect this pin to system GND.
Input data to these pins from external keyboard are latched at end of the
display cycle (maximum keyboard size is 12 x 2).
High level on this pin means that main board chip has been working
normally. See Note: This pin should never float. It is recommended have
a pull-down resistor on this input.
Remote control input. Feeds the IR data from photodiode to this pin.
Segment output pins (dual function as key source).
VFD outputs high voltage pull-down level. VDD--33.3V max.
These pins are selectable for segment or grid driving.
Grid output pins.
3.3V ± 0.3V Core main supply voltage.
Not used. Left unconnected.
Grid output pins.
Initializes the serial interface at the rising or falling edge to make the
STFPC31 wait for reception of command. The data input after the falling
edge of STB is processed as a command. While the command data is
processed, current processing is stopped, and the serial interface is
initialized. While STB is high, CLK is ignored and any instruction from
the MCU is neglected.
Reads serial data at the rising edge, and outputs data at the falling
edge.
47
DIN
I
Inputs serial data at the rising edge of the shift clock, starting from the
lower bit.
48
DOUT
O
Outputs serial data at the faling edge of the shift clock, starting from the
lower bit. This is the N-channel opendrain output pin.
49-52
LED1, LED2,
LED3, LED4
O
CMOS outputs (20mA, max).
Note:
For a detailed behavioral description of these pins, refer to the “STFPC311 Timing Power
Stand-by Sequencer Flow-Chart”. See Table 6 on page 13.
Doc ID 12324 Rev 2
7/39
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