237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 82

• Manufacturer Part Number: 237-00156
• Description: BOARD ISOLATION FOR ST7
• Manufacturer: SofTec Microsystems SRL
• Type: Optoisolation Boardr

Specifications of 237-00156

• Contents: *
• For Use With/related Products: STMicro ST7FMC Motor Control Device
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Parameter Name
Maximum
Allowed Current
Maximum
Allowed Duty
Cycle
D and Z Sampling Parameters
Sampling Clock
(fSCF)
Unused MCIx
Input
BEMF Sampling Method
Z Event Sampling
Method
In Current mode, to avoid damaging the motor, the user can set a
maximum current acceptable for the motor. This value cannot be
exceeded by the PI control (in Closed Loop) and by the current
reference real-time setting (in Open Loop). However, this value can be
exceeded during the start-up phase (Alignment Phase and
Acceleration Phase). The AK-ST7FMC Control Panel the maximum
current value is clamped to 8.7 A to suit the starter kit hardware.
In Voltage mode, the user can specify a maximum PWM duty cycle
that the application can’t exceed. This value cannot be exceeded by
the PI control (in Closed Loop) and by the duty cycle real-time setting
(in Open Loop). However, this value can be exceeded during the start-
up phase (Alignment Phase and Acceleration Phase). When using the
STMicroelectronics’ patented three-resistor control method (“Z Event
Sampling Method” parameter set to “At the end of the PWM low
state”), the maximum PWM duty cycle is clamped to a value
(calculated by the AK-ST7FMC Control Panel) which is based on the
programmed PWM signal frequency and on the minimum off time.
Clamping the maximum PWM signal duty cycle to this value allows for
sufficient time for BEMF reading during the PWM OFF state.
Sampling frequency used for detecting D events. The same sampling
frequency is used for detecting Zero Crossing events, when the (“Z
Event Sampling Method” parameter is set to “At PWM On, with
delay, at fSCF frequency” or to “At fSCF frequency”.
MSCR register, 2 bits from SCF1 to SCF0.
Sets the state of the two phases that, at any given time, are not
sampled (while the third phase is being sampled). When using
STMicroelectronics’ patented three-resistor sensorless method,
unused MCIx input are grounded.
MSCR register, DISS bit.
At end of the
PWM low state
At PWM on, with
delay, once
At PWM on, with
delay, at fSCF
frequency
Parameter Values/Description
To be used with STMicroelectronics patented
three-resistor control method. This method uses
the default jumper setting of the Motor Control
board.
To be used with sensorless classic control
method. The “Alternate Z Sampling” daughter
board must be used, and jumpers in the Motor
Control board must be set accordingly.
Classic automotive method. The “Alternate Z
Sampling” daughter board must be used, and
jumpers in the Motor Control board must be set
accordingly.
AK-ST7FMC User's Manual
Page 81
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