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STM86312 Datasheet(PDF) 4 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
4/16
Table 4: Recommended Operating Conditions
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 x5 (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 = 30
2/50 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
Min
TYP
Max
Unit
VDD
Logic Supply Voltage
4.5
5
5.5
V
VIH
High Level Input Voltage
0.7xVDD
VDD
V
VIL
Low Level Input Voltage
0
0.3xVDD
V
VEE
Driver Supply Voltage
0
VDD-35
V
Symbol
Parameter
Test Conditions
Value
Unit
Min.
Typ.
Max.
VOH1
High Level Output Voltage
LED1-LED4, IOH1=-1mA
0.9VDD
V
VOL1
Low Level Output Voltage
LED1-LED4, IOL1=20mA
1
V
VOL2
Low Level Output Voltage
DOUT,IOL2 =4mA
0.4
V
IOH21
High Level Output Current
VO =VDD - 2V, Seg1 to Seg11
-3
mA
IOH22
High Level Output Current
VO =VDD -2V, Grid1 toGrid6,
Seg12/Grid11 to Seg16/Grid7
-15
mA
IOLEAK Driver Leakage Current
VO =VDD - 35V, driver off
-10
µA
RL
Output Pull-Down Resistor
Driver Output
50
100
150
k
II
Input Current
VI =VDD or VSS
±1
µA
VIH
High Level Input Voltage
0.7VDD
V
VIL
Low Level Input Voltage
0.3VDD
V
VHYS
Hysteresis Voltage
CLK, DIN,STB
0.35
V
IDDdyn
Dynamic Current Consumption
Under no load, display off
5
mA




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