參數(shù)資料
型號(hào)： MC33976
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Dual Gauge Driver with Configurable Response Time(帶可設(shè)置響應(yīng)時(shí)間的雙標(biāo)尺驅(qū)動(dòng)器)
中文描述： 雙計(jì)驅(qū)動(dòng)器，可配置的響應(yīng)時(shí)間（帶可設(shè)置響應(yīng)時(shí)間的雙標(biāo)尺驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 31/40頁(yè)
文件大小： 5332K
代理商： MC33976
Analog Integrated Circuit Device Data
Freescale Semiconductor
31
33976
FUNCTIONAL DEVICE OPERATION
STATE MACHINE
Return to Zero Calibration
Many step motor applications require that the IC detect
when the motor is stalled after commanded to return to the
zero position for calibration purposes. The stalling occurs
when the pointer hits the end stop on the gauge bezel, which
is usually at the
zero
position. It is important that when the
pointer reaches the end stop it immediately stops without
bouncing away.
The 33976 device provides the ability to automatically and
independently return each of the two pointers to the zero
position via the RTZR and RTZCR SPI commands. An
automatic RTZ is initiated using the RZ0, RZ1, and RZ2 bits
provided the RZ4 bit is a logic [0]. Unconditional RTZ
movement is initiated using the RZ0, RZ1, and RZ2 bits
provided the RZ4 bit is a logic [1]. During an RTZ event, all
commands related to the gauge being returned are ignored
until the pointer has successfully zeroed or the RTZR bit RZ1
is written to disable the event. Once an RTZ event is initiated,
the device reports back via the SO pin that an RTZ is
underway.
The RTZCR command is used to set the RTZ pointer
speed, choose an appropriate blanking time, and preload the
integration accumulator with an appropriate offset. On
reaching the end stop, the device reports back to the
microcontroller via the status message that the RTZ was
successful. The RTZ automatically disables, allowing other
commands to be valid. In the event the master determines an
RTZ sequence is not working properly (i.e., the RTZ taking
too long), it can disable the command via the RTZR bit RZ1.
RTZCR bits RC10:RC5 are written to preload the
accumulator with a predetermined value that will assure an
accurate pointer stall detection. This preloaded value is
determined during application development by disabling the
automatic shutdown feature of the device with the RTZR bit
RZ4. This operating mode allows the master to monitor the
RTZ event, using the accumulator information available via
the SO if the device is configured to provide the RTZ
Accumulator Status. The unconditional RTZ event can be
turned OFF using the RTZR bit RZ1.
If the Position 0 location bit is in the default logic [0] mode,
then during an RTZ event the pointer is returned counter-
clockwise (CCW) using full steps at a constant speed
determined by the RTZCR RC3:RC0 and RC12:RC11 bits
during RTZ configuration (see
Figure 11
). Full steps are used
during an RTZ so that only one coil of the motor is being
driven at any time. The coil not being driven is used to
determine if the pointer is moving. If the pointer is moving, the
EMF signal that is present in the non-driven coil is processed
by integrating the signal present on the opened pin of the coil
while essentially grounding the other end.
Figure 11. Full Steps Counterclockwise
The IC automatically prepares the non-driven coil at each
step, waits for a predetermined blanking time, then
processes the signal for the duration of the full step. When
the pointer reaches the stop and no longer moves, the
dissipating flux is detected. The processed results are placed
in the RTZ accumulator, then compared to a decision
threshold. If the signal exceeds the decision threshold, the
pointer is assumed to be moving. If the threshold value is not
exceeded, the drive sequence is stopped if RTZR bit RZ4 is
logic [0]. If bit RZ4 is logic [1], the RTZ movement will
continue indefinitely until the RTZR bit RZ1 is used to stop the
RTZ event.
0
1
2
3
0
0
0
COSINE
SINE
I
MAX
I
COIL
I
COIL
I
MAX
I
MAX
I
MAX
0
1
2
3
0
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