STM86312

3/16

Table 1: Pin Description

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is

not implied.

Table 3: Thermal Data

PlN N°

SYMBOL

NAME AND FUNCTION

1, 2, 3, 4

SW1, SW2,

SW3, SW4

General-purpose switch inputs.

5

Output serial data at falling edge of the shift clock, starting from lower bit. This

is N-ch open-drain output pin.

6

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

8

CLK

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

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

Connect this pin to system GND.

27

44

OSC

Connect to an external resistor.

Symbol

Parameter

Value

Unit

Logic Supply Voltage

-0.5 to 7

V

Driver Supply Voltage

V

Logic Input Voltage

V

VFD Driver Output Voltage

V

LED Driver Output Current

25

mA

VFD Driver Output Current

-40 (Grid)

mA

-15 (Segment)

Operating Ambient Temperature

-40to85

°C

Symbol

Parameter

Value

Unit

Thermal Resistance Junction-Case

56

°C/W