STFPC311 datasheet(6/39 Pages) STMICROELECTRONICS

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2 Pin connection

STFPC311

6/39

2.1

Pin description

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

Table 1.

Pin description

Pin Nº

Symbol

Type

Name and function

OSC

This is the oscillator input pin. Connect this pin to an external resistor.

2, 3

SW1, SW2

General purpose switch input ports.

4MUTE

High level indicates mute status for audio. Low level indicates normal

working.Note 1

TBY

there is a typo. Pin5 and name is STBY. Standby output to put the MCU

in low power mode.

It is a command to the main power board. High level indicates stand-by

status. Low level indicates normal working. Note 1

GND

POWER

Connect this pin to system GND.

8, 9

KEY1, KEY2

Input data to these pins from external keyboard are latched at end of

the display cycle (maximum keyboard size is 12 x 2).

READY

High level on this pin means that main board chip has been working

normally.Note 1 This pin should never float. It is recommended have a

pull-down resistor on this input.

IR_DATA_IN

Remote control input. Feeds the IR data from photodiode to this pin.

14 to 25

SEG1/KS1 to

SEG12/KS12

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

These pins are selectable for segment or grid driving.

35 to 37

GRID8 to GRID6

Grid output pins.

6, 13,38

VDD

POWER

3.3V ± 0.3V Core main supply voltage.

Not used. Left unconnected.

40 to 44

GRID5 to GRID1

Grid output pins.

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

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.

CLK

Reads serial data at the rising edge, and outputs data at the falling

edge.

DIN

Inputs serial data at the rising edge of the shift clock, starting from the

lower bit.

DOUT

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

CMOS outputs (20mA, max).

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STFPC311 数据表(PDF) 6 Page - STMicroelectronics

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