ATAVRMC300 Atmel, ATAVRMC300 Datasheet - Page 9

• 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

4.1.4 Hall sensors
4.2 Half bridges
4.2.1 High side driving considerations
4.2.2 Test points
8124C-AVR-10/08
VHall (VHa) is available on J7 as power source for Hall sensors, typically found on
BLDC motors. With J1 VHa can be connected to Vcc or to a 5V regulator (U2). A
separate 5V regulator for the Hall sensors is included so Vcc can be 3,3V while using
Hall sensors, since most Hall sensors will not work on 3,3V.
The half bridge consists of two n-channel power MOSFETs, driven by an integrated
high and low side driver IC (IR2101S). The integrated driver IC is powered from Vin
and provides gate voltages to the high and low side power MOSFETs. Schematics for
the half bridge for phase U is shown in Figure 4-2
Figure 4-2. Phase U half bridge.
The high side of the half-bridge uses a bootstrap circuit. This means the duty cycle
and the on-time are limited by the requirement to refresh the charge in the bootstrap
capacitor. If the driving logic fails to do this, the gate voltage to the high side MOS will
decrease and the R
high side MOS, and consequently destroy it.
Refer with IR2101S datasheets for detailed information about the bootstrap circuit.
Each half bridge has several testpoints to allow for measurements. MOS gate
voltages for high (VGh) and low-side (VGl) and bootstrap voltage (Vboot) are
available. Both sides of the shunt resistors (- and +) can also be measured.
DS
will increase. This may result in high power dissipation in the
AVR430
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