MC68HC05V12 Datasheet, PDF (181/246 Pages) Freescale Semiconductor, Inc – HCMOS Microcontreller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05V12
Section 15. Gauge Drivers
15.1 Contents
15.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.3 Gauge System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
15.4 Coil Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .184
15.5 Technical Note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
15.6 Gauge Driver Control Registers . . . . . . . . . . . . . . . . . . . . . . .187
15.6.1 Gauge Enable Register . . . . . . . . . . . . . . . . . . . . . . . . . . .187
15.6.2 Current Magnitude Registers . . . . . . . . . . . . . . . . . . . . . . .189
15.6.3 Current Direction Registers . . . . . . . . . . . . . . . . . . . . . . . .191
15.6.3.1
15.6.3.2
15.6.3.3
15.6.3.4
15.6.3.5
15.6.3.6
Current Direction Register for Major A . . . . . . . . . . . . . .192
Current Direction Register for Major B . . . . . . . . . . . . . .192
Current Direction Register for Minor A . . . . . . . . . . . . . .193
Current Direction Register for Minor B . . . . . . . . . . . . . .193
Current Direction Register for Minor C. . . . . . . . . . . . . .194
Current Direction Register for Minor D. . . . . . . . . . . . . .194
15.7 Coil Sequencer and Control . . . . . . . . . . . . . . . . . . . . . . . . . .195
15.7.1 Scanning Sequence Description . . . . . . . . . . . . . . . . . . . .195
15.7.1.1 Automatic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .195
15.7.1.2 Manual Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
15.7.2 Scan Status and Control Register . . . . . . . . . . . . . . . . . . .198
15.8 Mechanism Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
15.9 Gauge Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .200
15.10 Gauge Regulator Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . .202
15.11 Coil Current Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .202
15.12 External Component Considerations . . . . . . . . . . . . . . . . . . .203
15.12.1 Minimum Voltage Operation. . . . . . . . . . . . . . . . . . . . . . . .204
15.12.2 Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205
15.12.3 Coil Inductance Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
15.13 Operation in Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
15.14 Operation in Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206
MC68HC05V12 — Rev. 2.0
Gauge Drivers
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Technical Data