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Atmel AVR430: MC300 manual

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Table of contents for the manual

  • Page 1

    A VR 430: MC300 Hardwa re User Guide Features • General-pur pose power stage for DC and stepper m otors • Modular sy stem with 2,54mm pin header connector f or device boards • Four half-br idges wit h independent control of high and low side • Onboard volt age regulators for device board (5/3,3V) and Hall sensor s (5V) • Hall sensor, back[...]

  • Page 2

    2 A VR 430 8124C -AVR-10/08 2 Hardware overv iew Please ref er to schemat ics, la y ou t and BOM a vailable at http:/ /www .atmel.com. The MC300 mo tor contro l d river board is a p ower stage b oard in tended for dr iving BLDC a nd steppe r motors. It h as four half-brid ges with independ ent contro l of high and low s ides. Each bridge has option[...]

  • Page 3

    AVR430 3 8124C -AVR-10/08 2.2 Connections Figure 2-1. MC 300 with de vice board, con nector deta ils and protot ype board fitted . 2.2.1 Device board connector The MC 300 dr iver boar d can dir ectl y connect t o an AVR d evice b oard. This is accompl ished by a hori zontal f emale 0 .1” p in he ader connector located on the left side of the bo a[...]

  • Page 4

    4 A VR 430 8124C -AVR-10/08 Figure 2-2. Device board connector mechanical specificati on and schemat ics. 2.3 Jumpers Refer to c omponent f loorplan for locat ion of jumper s. Table 2-1. Jumpers and their funct ions. Designator Use and settings J1 (VHa) Selects voltage source to Hall s ensors (VHa) J1 open – VHa not connected J1 pin 2 & 3 con[...]

  • Page 5

    AVR430 5 8124C -AVR-10/08 Table 2-2. MC300 de vice board con nector signa l description. Pin Located Name Direction Description 1 J9p1 GND - 2 J9p2 GND - System ground (Vin/VCC) 3 J9p3 GND - 4 J9p4 Vin Output Input power Vin ( 10-20V) 5 J9p5 VCC Output 6 J9p6 VCC Output Regulated power Vc c (3.3V/5V) 7 J9p7 VCC Output 8 J9p8 GND - System ground (Vi[...]

  • Page 6

    6 A VR 430 8124C -AVR-10/08 3 PCB 3.1 PCB Layout The MC 300 i s organize d as shown in Figure 3-1. M ost si gnals, i mportant components and jumper i nformation are written o n the silk screen. For individual c omponent placemen t refer to th e component floor plan. Figure 3-1. MC300 PC B layout. In Figure 3-1 the follow ing areas are marked: 1. De[...]

  • Page 7

    AVR430 7 8124C -AVR-10/08 3.1.1 Phase area Each ph ase has its own area with a fr ame draw n on silkscreen. In Figure 3-2 th e area for phase ‘V’ is show n, and everyth ing inside this frame regard s this phase o nly. Figure 3-2. Phase ‘V ’ area on MC30 0 PCB. From the le ft we see: 1. Shunt filte r/damping bl ock – denoted ‘Sh’ 2. Ba[...]

  • Page 8

    8 A VR 430 8124C -AVR-10/08 4 Detailed description 4.1 Power The MC300 has two pow er circuits. Vin for powering dr iver ICs and volt age regulator s, and Vmotor (V m) for powering th e output stage (MO SFETs). The sep arate power supply for the motor, Vm, allows th e use o f motor voltages outside the voltage range of th e driver ICs. This also i [...]

  • Page 9

    AVR430 9 8124C -AVR-10/08 4.1.4 Hall sensor s VHall (V Ha) is availabl e on J7 as po wer source for Hall sens ors, typicall y found on BLDC m otors. W ith J1 VH a c an be conn ected to Vc c or to a 5V re gulator (U2) . A separate 5V regu lator for th e Ha ll sensors is included so Vcc can be 3,3V while using Hall sensor s, since mo st Hall sensors [...]

  • Page 10

    10 A VR 430 8124C -AVR-10/08 4.3 Shunts The board is shipped with a co mmon shunt r esistor (ShCo m - R62) of 0 ,050 ohm and the four phase s hunt re sistors are zero ohm resistors, shown in Figure 4-3. Th is allows for measureme nt of the tota l current going to ground v ia all half bridge s. Figure 4-3. Shunt resis tor networ k. If current measur[...]

  • Page 11

    AVR430 11 8124C -AVR-10/08 4.4 Back-EMF For s ensorless applicatio ns, the driving log ic uses back EMF f rom t he mo tor’s ph ases to k eep tr ack of the moto r position. To observe t he back EMF from a phase, the phase is le ft floating, i.e. with the high or low s ide MOS not po wered, an d the vo ltage on the phas e is read. Fo r motor s w it[...]

  • Page 12

    12 A VR 430 8124C -AVR-10/08 4.5 Upgrading the MC300 As the boa rd is shipp ed, its limitati ons are Vm max =40V and Im max =6A. These lim its can be increa sed by repla cing the relev ant compone nts (not inc luded). 4.5.1 Voltage limit ations If a Vm max higher than 40V is required, then some component s must be cha nged on the board . Compone nt[...]

  • Page 13

    8124C -AVR-10/08 D Headquarter s International Atmel Corporation 2325 Orchard Parkw ay San Jose, CA 95131 USA Tel: 1(408) 441 -0311 Fax: 1(408) 487-2600 Atmel Asia Room 1219 Chinachem Golden Plaz a 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1 369 Product Cont act Atmel Europe Le Krebs 8, Rue Jean-Pierre Tim[...]