STFPC311 查看數據表（PDF） - STMicroelectronics
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STFPC311 Datasheet PDF : 39 Pages
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2 Pin connection
STFPC311
2.1 Pin description
Table 1. Pin description
Pin Nº
Symbol
Type
Name and function
1
OSC
2, 3
SW1, SW2
4
MUTE
I
This is the oscillator input pin. Connect this pin to an external resistor.
I
General purpose switch input ports.
O
High level indicates mute status for audio. Low level indicates normal
working.Note 1
5S
TBY
there is a typo. Pin5 and name is STBY. Standby output to put the MCU
in low power mode.
O
It is a command to the main power board. High level indicates stand-by
status. Low level indicates normal working. Note 1
7
GND
POWER Connect this pin to system GND.
8, 9
KEY1, KEY2
I
Input data to these pins from external keyboard are latched at end of
the display cycle (maximum keyboard size is 12 x 2).
10
READY
1
IR_DATA_IN
High level on this pin means that main board chip has been working
I
normally.Note 1 This pin should never float. It is recommended have a
pull-down resistor on this input.
I
Remote control input. Feeds the IR data from photodiode to this pin.
14 to 25
SEG1/KS1 to
SEG12/KS12
O
Segment output pins (dual function as key source).
12, 26
VSS
POWER VFD outputs high voltage pull-down level. VDD--33.3V max.
27 to 34
SEG13/GRID16
to SEG20/GRID9
O
These pins are selectable for segment or grid driving.
35 to 37 GRID8 to GRID6
O
Grid output pins.
6, 13,38
39
40 to 44
VDD
NC
GRID5 to GRID1
POWER 3.3V ± 0.3V Core main supply voltage.
O
Not used. Left unconnected.
O
Grid output pins.
45
STB
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
I
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.
46
CLK
I
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
49-52
DOUT
LED1, LED2,
LED3, LED4
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.
O
CMOS outputs (20mA, max).
Note: 1 For a detailed behavioral description of these pins, refer to the “STFPC311 Timing Power
Stand-by Sequencer Flow-Chart”. See Table 6 on page 12
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