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STFPC320 Datasheet(PDF) 69 Page - STMicroelectronics

Part # STFPC320
Description  Front panel controller/driver with standby power management and real-time clock
PDF  78 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STFPC320 Datasheet(HTML) 69 Page - STMicroelectronics

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STFPC320
Electrical characteristics
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17.3
Power consumption estimation
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,
FIP driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x
30 (mW)
RL dissipation = (VDD – VSS)
2/50 x (segment + 1) (mW)
LED driver dissipation = number of LEDs x 20 (mW)
Dynamic power consumption = VDD x 5 (mW)
Example:
Where VSS = -30 V, VDD = 3.3 V and in 16-segment and 12-digit modes,
FIP driver dissipation = 16 x 6 + 12/13 x 30 = 124
RL dissipation = 33.32/50 x 17 = 377
LED driver dissipation = 2 x 20 = 40
Dynamic power consumption = 3.3 x 5 = 16.5
Total = 557.5 mW



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