MC68HC05V12 Datasheet, PDF (203/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Gauge Drivers
External Component Considerations
15.12 External Component Considerations
To determine the values and tolerances of the external components
required to drive the air core gauge coils, the minimum V_BATT voltage, at
the V12 pin, and the power dissipation should be considered.
Figure 15-15 shows the components in the path between the +12 V
coming in through the external devices the internal devices and into
V_SSG.
+12 V
+
−^VDiode
+
−^VPass
V_GSUP
GAUGE COILS
COIL DRIVER PAD
R_Coil
L_Coil
COIL DRIVER PAD
PIN ON PACKAGE
R_I
V_SSG PAD
Figure 15-15. Coil Driver Current Path
MC68HC05V12 — Rev. 2.0
Gauge Drivers
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Technical Data