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STM86312 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. STM86312
Description  1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STM86312
3/16
Table 1: Pin Description
Table 2: Absolute Maximum Ratings (TA = 25°C, VSS =0V)
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
DOUT
Output serial data at falling edge of the shift clock, starting from lower bit. This
is N-ch open-drain output pin.
6
DIN
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
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.
27
VEE
Pull-down level. VDD -35V max.
44
OSC
Connect to an external resistor.
Symbol
Parameter
Value
Unit
VDD
Logic Supply Voltage
-0.5 to 7
V
VEE
Driver Supply Voltage
VDD+0.5 to VDD-40
V
VI
Logic Input Voltage
-0.5 to VDD+0.5
V
VO2
VFD Driver Output Voltage
VEE-0.5 to VDD+0.5
V
IO1
LED Driver Output Current
25
mA
IO2
VFD Driver Output Current
-40 (Grid)
mA
-15 (Segment)
TA
Operating Ambient Temperature
-40to85
°C
Symbol
Parameter
Value
Unit
RTj-c
Thermal Resistance Junction-Case
56
°C/W




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