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參數(shù)資料
| 型號： | MCZ33976EG |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Dual Gauge Driver with Configurable esponse Time |
| 中文描述： | 雙計驅(qū)動器，可配置esponse時間 |
| 文件頁數(shù)： | 33/41頁 |
| 文件大?。?/td> | 551K |
| 代理商： | MCZ33976EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
33
33976
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
It should be pointed out that the flux value, for an ideal
motor with the coils perfectly aligned at 90°, will vary little
from full step to full step if all other variables (e.g.,
temperature) are held constant. The full steps are evenly
spaced which results in equidistant movement as the motor
is full stepped.
In comparison, motors that have coils aligned at a 60°
angle will result in two distinct flux values as the coils are
driven in the same full step fashion. This lack of symmetry in
the measured flux is due to the difference in the electrical
angles between full steps. In other words, the distance that
the rotor moves changes from full step to full step. This
difference can be observed in
Figure 9
and
Table 29
. In
Figure 9
, where PE6 = 0, the difference in microsteps
between alternating full steps (one coil at maximum current
while the other is at zero) is always six. In contrast, as seen
in
Figure 9
, where PE6 = 1, the difference in microsteps
between full steps of the 60° coils alternates between four
and eight. These expected differences need to be taken into
account when setting the RTZ threshold.
Only one gauge at a time can be returned to the zero
position. The gauge not returning to zero can continue to be
controlled. An RTZ should not begin until the gauge to be
calibrated is at a static position and its pointer is at a full step
position. An attempt to calibrate a gauge while the other is in
the process of an RTZ event is ignored by the device. In most
applications of the RTZR command, it is possible to avoid a
visually obvious sequential calibration by first bringing the
pointers back close to their previous zero positions, then re-
calibrating them sequentially.
After completion of an RTZ, the 33976 automatically
assigns the zero-step position to the full step position at the
end-stop location. Because the actual zero position could lie
anywhere within the full step where the zero was detected,
the assigned zero position could be within a window of ±0.5
degree. An RTZ can be used to detect stall, even if the
pointer already rests on the end stop when an RTZ sequence
is initiated. However, it is recommended the pointer be
advanced by at least 12 microsteps to the nearest full step
prior to initiating the RTZ.
RTZ OUTPUT
During an RTZ event the non-driven coil is analyzed to
determine the state of the motor. The 33976 multiplexes the
coil voltages and provides the signal from the non-driven coil
to the RTZ pin.
DEFAULT MODE
Default mode refers to the state of the 33976 after an
internal or external reset prior to SPI communication. An
internal reset occurs during V
DD
power-up or if V
PWR
falls
below 4.0 V. An external reset is initiated by the
RST
pin
driven to a logic [0]. With the exception of the RTZCR full step
time and the RMPSEL Register values, all of the specific pin
functions and internal registers will operate as though all of
the addressable configuration register bits were set to
logic [0]. This means, for example, all of the outputs will be
disabled after a power-up or external reset, and SO flag OD6
and OD8 are set, indicating an undervoltage event. Anytime
an external reset is exerted and the default is restored, all
configuration parameters (e.g., clock calibration, maximum
speed, RTZ parameters, etc.) are lost and must be reloaded.
FAULT LOGIC REQUIREMENTS
The 33976 device indicates each of the following faults as
they occur:
Overtemperature fault
Undervoltage V
PWR
Overvoltage V
PWR
Clock out of spec
These fault bits remain enabled until they are clocked out
of the SO pin with a valid SPI message.
Overcurrent faults are not reported directly; however, it is
likely an overcurrent condition will become a thermal issue
and be reported.
Overtemperature Fault Requirements
The 33976 incorporates overtemperature protection
circuitry, which shuts off the affected gauge driver when
excessive temperatures are detected. In the event of a
thermal overload, the affected gauge driver is automatically
disabled. The overtemperature fault is flagged via the OT0
and/or OT1 device status bits. The indicating flag continues
to be set until the affected gauge is successfully re-enabled,
provided the junction temperature has fallen to a temperature
below the hysteresis level.
OVERVOLTAGE FAULT REQUIREMENTS
The device is capable of surviving V
PWR
voltages within
the maximum specified in
Maximum Ratings
table, page
4
.
V
PWR
levels resulting in an Overvoltage Shutdown condition
can result in uncertain pointer positions. Therefore, the
pointer position should be re-calibrated. The master will be
notified of an overvoltage event via the SO pin if the device
status is selected. Overvoltage detection and notification
occurs regardless of whether the gauge(s) are enabled or
disabled.
Overcurrent Fault Requirements
Output currents are limited to safe levels allowing the
device to rely on thermal shutdown to protect itself.
Undervoltage Fault Requirements
Undervoltage V
PWR
conditions may result in uncertain
pointer positions. Therefore, the internal clock and the pointer
position may require re-calibration. The state machine
continues with V
PWR
voltage levels as low as 4.0 V; however,
the coil voltages may be clipped. The master can be notified
of an undervoltage event via the SO pin.
RESET (SLEEP MODE)
The device can reset internally or externally. If the V
DD
level falls below the V
DDUV
level (refer to the Static Electrical
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33976EG | 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GUAGE DRIVER SPI |
| MCZ33976EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Dual Gauge Driver with Configurable Response Time |
| MCZ33976EGR2 | 功能描述:功率驅(qū)動器IC CONFIG DUAL GAUGE DR RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MCZ33977EG | 功能描述:馬達(dá)/運(yùn)動/點火控制器和驅(qū)動器 SINGLE GAUGE DR. LG PTR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MCZ33977EG | 制造商:Freescale Semiconductor 功能描述:IC STEPPER MOTOR GAUGE DRIVER SPI |
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