STM86312_06 datasheet(5/24 Pages) STMICROELECTRONICS

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STM86312

Pin settings

5/24

2.2

Pin description

Table 1. Pin description

Pin N°

Symbol

Name and function

1, 2, 3, 4

SW1, SW2,

SW3, SW4

General-purpose switch inputs.

DOUT

Output serial data at falling edge of the shift clock, starting

from lower bit. This is N-ch open-drain output pin.

DIN

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

lower bit.

8CLK

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

edge.

9STB

Initializes serial interface at rising or falling edge to make

STM86312 waiting for reception of command. Data input after

STB has fallen are processed as a command. While command

data are processed, current processing is stopped, and the

serial interface is initialized. While STB is high, CLK is ignored.

10, 11, 12, 13

KEY1, KEY2,

KEY3, KEY4

Input data to these pins are latched at end of the display cycle.

14, 38

VDD

5V ± 10%.

15, 16, 17,

18, 19, 20

SEG1/KS1 to

SEG6/KS6

Segment output pins (Dual function as key source).

21, 22, 23,

24, 25

SEG7 to SEG11

Segment output pins.

26, 28, 29,

30, 31

SEG12/GRID11 to

SEG16/GRID7

These pins are selectable for segment or grid driving.

32, 33, 34,

35, 36, 37

GRID1 to GRID6

Grid output pins.

39, 40, 41, 42

LED1 to LED4

CMOS outputs. +20 mA max.

7, 43

VSS

Connect this pin to system GND.

VEE

Pull-down level. VDD - 35V max.

OSC

Connect to an external resistor.

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