ATAVRMC300 Atmel, ATAVRMC300 Datasheet - Page 10

• Manufacturer Part Number: ATAVRMC300
• Description: BOARD EVAL LV MOTOR CONTROL PWR
• Manufacturer: Atmel
• Series: AVR®r

Specifications of ATAVRMC300

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATmega32M1
• Primary Attributes: 3-Ph BLDC, Brushed DC, Stepper Motor Driver Board, 40V, 6A
• Secondary Attributes: Requires ATAVRMC301, ATAVRMC303, or ATAVRMC310
• Processor To Be Evaluated: ATmega32M1
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.3 Shunts
4.3.1 Shunt feedback filters
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AVR430
The board is shipped with a common shunt resistor (ShCom - R62) of 0,050 ohm and
the four phase shunt resistors are zero ohm resistors, shown in Figure 4-3. This
allows for measurement of the total current going to ground via all half bridges.
Figure 4-3. Shunt resistor network.
If current measurements of separate phases are required, the common shunt should
be changed to a zero ohm resistor and the zero ohm resistors on each phase (ShU -
R27, ShV - R38, ShW - R49 and ShX - R64) should be replaced with appropriate
shunt resistors.
The voltages over the shunt resistors (ShCom/ShU/V/W/X) are fed to a filter/damping
block, ShU as shown in Figure 4-4. The board is shipped with a filter that consists of a
10k ohm resistor in series with a 10nF capacitor, resulting in a low pass filter with a
1,6kHz cutoff frequency. The signal from the filters (ShCom’/ShU’/V’/W’/X’) are
available on the device board interface.
Figure 4-4. Filter/damping block for shunt feedback.
8124C-AVR-10/08