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| 型号： | MC3PHACVFAE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 31/36页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR CONTROLLER 32QFP |
| 标准包装： | 250 |
| 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： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
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Optoisolated RS232 Interface Application Example
operating conditions, this timeout will cause the Fault state to be automatically exited to the
PWM0RPM state, where motion will once again be initiated if a CmdFwd or CmdRev has been
received. The exceptions to this rule are the cases when the Fault state was entered from the
PWMHighZ or PWMOFF states, in which case, exiting from the Fault state will return back to these
states.
Optoisolated RS232 Interface Application Example
Some motor control systems have the control electronics operating at the same potential as the high
voltage bus. Connecting a PC to that system could present safety issues, due to the high voltage potential
between the motor control system and the PC. Figure 19 is an example of a simple circuit that can be
used with the MC3PHAC to isolate the serial port of the PC from the motor control system.
The circuit in Figure 19 is the schematic of a half-duplex optoisolated RS232 interface. This isolated
terminal interface provides a margin of safety between the motor control system and a personal computer.
The EIA RS232 specification states the signal levels can range from ±3 to ±25 volts. A Mark is defined by
the EIA RS232 specification as a signal that ranges from –3 to –25 volts. A Space is defined as a signal
that ranges from +3 to +25 volts. Therefore, to meet the RS232 specification, signals to and from a
terminal must transition through 0 volts as it changes from a Mark to a Space. Breaking the circuit down
into an input and output section simplifies the explanation of the circuit.
D1
1N4148
R1
1 k ?
1
U1
4N35
4
+5 V
R2
J1
D2
1 k ?
5
9
4
GND
DTR
1N4148
+
2
5
TO MC3PHAC PIN 16
8
3
7
2
6
1
TxD
RTS
RxD
D3
1N4148
R3
4.7 k ?
C1
2.2 μ F/50 V
4
1
R4
330 ?
+5 V
CON/CANNON9
FEMALE
~+12 V
5
U2
4N35
2
TO MC3PHAC PIN 17
ISOLATION BARRIER
RS232 ISOLATED
HALF-DUPLEX, MAXIMUM 9600 BAUD
Figure 19. Optoisolated RS232 Circuit
To send data from a PC to the MC3PHAC, it is necessary to satisfy the serial input of the MC3PHAC. In
the idle condition, the serial input of the MC3PHAC must be at a logic 1. To accomplish that, the transistor
in U1 must be turned off. The idle state of the transmit data line (TxD) from the PC serial port is a Mark
(–3 to –25 volts). Therefore, the diode in U1 is off and the transistor in U1 is off, yielding a logic 1 to the
MC3PHAC’s serial input. When the start bit is sent to the MC3PHAC from the PC’s serial port, the PC’s
TxD transitions from a Mark to a Space (+3 to +25 volts), thus forward biasing the diode in U1. Forward
biasing the diode in D1 turns on the transistor in U1, providing a logic 0 to the serial input of the
MC3PHAC. Simply stated, the input half of the circuit provides input isolation, signal inversion, and level
MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2
Freescale Semiconductor
31
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