237-00156 SofTec Microsystems SRL, 237-00156 Datasheet - Page 26

• 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

AK-ST7FMC User's Manual
STMicroelectronics terminology) plugs into the Optoisolation board, while
another ISP cable goes from the Optoisolation board to the Motor Control
board’s ICC connector. The Optoisolation board helps to prevent damage to
the PC in the event of a catastrophic failure on the Motor Control board. This
isolation barrier also solves the problem caused by the PC, inDART-STX
and the Motor Control board being at different ground potentials.
2
2.6 The “Alternate Z Sampling” Daughter Board
When using a BLDC motor the Motor Control board uses, by default,
STMicroelectronics patented three-resistor method for BEMF detection. This
method has the advantage of being implemented with few components, but
has the drawback of limiting the maximum duty cycle of the PWM signal
applied to the power switches.
If a specific application requires a 100% PWM duty cycle, the “classical”
BEMF detection method must be implemented.
The “Alternate Z Sampling” daughter board allows to drive a BLDC motor
using the classical BEMF detection circuit. The daughter board plugs into the
J11 connector and into the W14, W15 and W16 jumpers of the Motor Control
board.
Of course, motor-specific resistors and capacitors must be mounted on the
daughter board.
For detailed information, please refer to STMicroelectronics’ AN1946
Application Note.
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