STFPC320 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STFPC320

Front panel controller/driver with standby power management and real-time clock

STMicroelectronics 

STFPC320

Electrical characteristics

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

69/78

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