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| 型号： | MC3PHACVDWE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 28/36页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR CONTROLLER 28-SOIC |
| 标准包装： | 26 |
| 应用： | AC 电机控制器，3 相 |
| 输出数： | 1 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
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Operation
Command State Machine
When using the PC master software mode of operation, the command state machine governs behavior
of the device depending upon its current state, system parameters, any new commands received via
the communications link, and the prevailing conditions of the system. The command state diagram is in
Figure 18 . It illustrates the sequence of commands which are necessary to bring the device from the reset
condition to running the motor in a steady state and depicts the permissible state transitions. The device
will remain within a given state unless the conditions shown for a transition are met.
Some commands only cause a temporary state change to occur. While they are being executed, the state
machine will automatically return to the state which existed prior to the command being received. For
example, the motor speed may be changed from within any state by using the WRITEVAR16 command
to write to the "Speed In" variable. This will cause the "Set Speed" state to be momentarily entered, the
"Speed In" variable will be updated and then the original state will be re-entered. This allows the motor
speed, acceleration or base frequency to be modified whether the motor is already accelerating,
decelerating, or in a steady state.
Each state is described here in more detail.
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Reset — This state is entered when a device power-on reset (POR), pin reset, loss of crystal,
internally detected error, or reset command occurs from within any state. In this state, the device
is initialized and the PWM outputs are configured to high impedance. This state is then
automatically exited.
PWMHighZ — This state is entered from the reset state. This state is also re-entered after one and
only one of the PWM dead-time or polarity parameters have been initialized. In this state the PWM
outputs are configured to a high-impedance state as the device waits for both the PWM dead time
and polarity to be initialized.
SetDeadTime (write once) — This state is entered from the PWMHighZ state the first time that a
write to the PWM dead-time variable occurs. In this state, the PWM dead time is initialized and the
state is then automatically exited. This state cannot be re-entered, and hence the dead time cannot
be modified, unless the reset state is first re-entered.
SetPolarity (write once) — This state is entered from the PWMHighZ state the first time that the
PWM polarity command is received. In this state, the PWM polarity is initialized and the state is
then automatically exited. This state cannot be re-entered, and hence the polarity cannot be
modified, unless the reset state is first re-entered.
PWMOFF — This state is entered from the PWMHighZ state if both the PWM dead time and
polarity have been configured. In this state, the PWM is activated and all the PWM outputs are
driven off for the chosen polarity. The device then waits for the PWM base frequency, motor speed,
and acceleration to be initialized.
PWM0RPM — This state is entered from the PWMOFF state when the PWM base frequency,
motor speed, and acceleration have been initialized. This state can also be entered from the
FwdDecel or RevDecel states if a CmdStop command has been received, and the actual motor
speed has decelerated to 0 r.p.m. In this state, the PWM pins are driven to the off state for the
chosen polarity. The only exit of this state is to the PWMPump state, which occurs when a CmdFwd
or CmdRev command is received.
MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2
Freescale Semiconductor
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