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| MC68HC05V12 Datasheet, PDF (205/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit | |||
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Freescale Semiconductor, Inc.
Gauge Drivers
External Component Considerations
The minimum required VGSUP must agree with the minimum generated
VGSUP of
VGSUP(min) = VGSUP(nom) x (1âTOL)
equating the two
VGSUP(nom) x (1âTOL) = ICoil(max) x [ RCoil(max) + RSI(max) ]
VGSUP(nom)
=
ICoil(max)
x
[RCoil(max)
(1 â TOL)
+
RSI(max)]
15.12.2 Power Dissipation
To keep the junction temperature to a minimum, the power consumed by
the gauge drivers must be factored into the chip power dissipation
equation. The total chip power dissipation combined with the thermal
resistance of the package cannot exceed the maximum junction
temperature, TJ. The total chip power dissipation is given by this
equation:
PD = PGauge + PChip
PCHIP is the power contribution by all chip modules that are connected
to the VDD and VDDA sources including part of the gauge module. To
calculate PChip, use this equation:
PChip = (IDD x VDD) + (ICCA x VCCA)
The power dissipation contributed by the gauge module is given by this
equation:
PGauge = [VGSUP(max) X IGSUP] + PGDrivers
Where
PGDrivers =
[(VGSUP(max) x ICoil(max)) â (ICoil(max) 2 x RCoil(min))] x 12 x SF
Where
⢠IGSUP = the current consumed by the gauge module from the
VGSUP pin for functions other than generating coil currents
MC68HC05V12 â Rev. 2.0
Gauge Drivers
For More Information On This Product,
Go to: www.freescale.com
Technical Data
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