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33970 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc |
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33970 Datasheet(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 36 page  Analog Integrated Circuit Device Data Freescale Semiconductor 21 33970 FUNCTIONAL DEVICE OPERATION LOGIC COMMANDS AND REGISTERS • 1 = Return to Zero enabled successfully ACC14:ACC0 (OD14:OD0) —These 15 bits are from the RTZ accumulator. They represent the integrated signal present on the non-driven coil during an RTZ event. These bits are logic [0] after power-on reset, or after the RST pin transitions from logic [0] to [1]. After an RTZ event, they will represent the last RTZ accumulator result before the RTZ was stopped. ACC14 is the MSB and is the sign bit used for zero detection. Figure 8. RTZ Accumulator (Typical) The analog-to-digital converter's linear input range covers the expected magnitude of motor back e.m.f. signals, which is_usually less than 500mV. Input signals greater than this will not cause any damage (the circuit is connected to the motor H-Bridge drivers, and thus is exposed to the full magnitude of the drive voltages), but may cause some small loss of linearity. A typical plot of output vs. input is shown in Figure 8 for 4ms step times. Gauge 0 Pointer Position Status Information Most recent valid PECCR command resulting in the Gauge 0 Pointer Position status output: The bits in Table 17 are read-only bits. ENB0 (OD15)—This bit indicates whether Gauge 0 is enabled. • 0 = Disabled • 1 = Enabled DIR0 (OD14)—This bit indicates the direction Gauge 0 is moving. • 0 = Toward position 0 • 1 = Away from position 0 DIRC0 (OD13)—This bit is used to determine whether the direction of the most recent pointer movement is toward the last commanded position or away from it. • 0 = Direction of the pointer movement is toward the commanded position • 1 = Direction of the pointer movement is away from the commanded position CMD0 (OD12)—This bit indicates whether Gauge 0 is at the most recently commanded position. • 0 = At commanded position • 1 = Not at commanded position POS11:POS0 (OD11:OD0)—These 12 bits represent the actual position of the pointer at the time CS transitions to a logic [0]. Gauge 1 Pointer Position Status Information Most recent valid PECCR command resulting in the Gauge 1 Pointer Velocity status output: D11 D10 D9 D8 1 1 0 0 Table 17. Gauge 0 Pointer Position Status Output Register Bits OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0 Read ENB0 DIR0 DIRC0 CMD0 POS11 POS10 POS9 POS8 POS7 POS6 POS5 POS4 POS3 POS2 POS1 POS0 Write – – – – – – – – – – – – – – – – D11 D10 D9 D8 1 1 0 1 Table 18. Gauge 1 Pointer Position Status Output Register Bits OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0 Read ENB1 DIR1 DIRC1 CMD1 POS11 POS10 POS9 POS8 POS7 POS6 POS5 POS4 POS3 POS2 POS1 POS0 Write – – – – – – – – – – – – – – – – |
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