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STM86312 Datasheet, PDF (4/16 Pages) STMicroelectronics – 1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
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STM86312
Table 4: Recommended Operating Conditions
Symbol
Parameter
VDD Logic Supply Voltage
VIH High Level Input Voltage
VIL Low Level Input Voltage
VEE Driver Supply Voltage
Min
4.5
0.7xVDD
0
0
TYP
5
Max
5.5
VDD
0.3xVDD
VDD-35
Unit
V
V
V
V
Maximum power consumption PMAX = VFD driver dissipation + RL dissipation + LED driver dissipation +
dynamic power consumption.
Where segment current = 3 mA, grid current = 15 mA, and LED current = 20 mA,
VFD driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x 30 (mW)
RL dissipation = (VDD - VEE)2/50 x (segment + 1) (mW)
LED driver dissipation = number of LEDs x 20 (mW)
Dynamic power consumption = VDD x 5 (mW)
Example
Where VEE = -25 V, VDD = 5 V, and in 16-segment and 6-digit modes,
VFD driver dissipation = 16 x 6 + 6/7 x 30 = 122
RL dissipation = 302/50 x 17 = 306
LED driver dissipation = 4 x 20 = 80
Dynamic power consumption = 5 x 5 = 25
Total 553 mW.
Table 5: Electrical Characteristics (VDD = 4.5 to 5.5V, VSS = 0V, VEE = VDD - 35V, TA = -20 to 70°C,
unless otherwise noted. Typical values are at TA = 25°C)
Symbol
Parameter
VOH1
VOL1
VOL2
IOH21
IOH22
High Level Output Voltage
Low Level Output Voltage
Low Level Output Voltage
High Level Output Current
High Level Output Current
IOLEAK
RL
II
VIH
VIL
VHYS
IDDdyn
Driver Leakage Current
Output Pull-Down Resistor
Input Current
High Level Input Voltage
Low Level Input Voltage
Hysteresis Voltage
Dynamic Current Consumption
Test Conditions
LED1-LED4, IOH1=-1mA
LED1-LED4, IOL1=20mA
DOUT, IOL2 = 4mA
VO = VDD - 2V, Seg1 to Seg11
VO = VDD - 2V, Grid1 to Grid6,
Seg12/Grid11 to Seg16/Grid7
VO = VDD - 35V, driver off
Driver Output
VI = VDD or VSS
CLK, DIN, STB
Under no load, display off
Value
Min. Typ.
0.9VDD
-3
-15
Max.
1
0.4
50
0.7VDD
100
0.35
-10
150
±1
0.3VDD
5
Unit
V
V
V
mA
mA
µA
kΩ
µA
V
V
V
mA
4/16
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