ALLEGRO A5947GET Evaluation Board User Guide

ALLEGRO A5947GET Evaluation Board

Specifications

Configuring the Evaluation Board

SW1 controls whether the USB is interfacing with the on-board A5947 or through CN2 to an external A5947.

Using the Evaluation Board

1. Set the motor voltage supply to the intended voltage.
2. Turn off motor voltage supply.
3. Connect motor voltage supply to J2.
4. Connect the fan to either J1 (screw-down terminals) or CN3 (Molex 0022022035; Digikey WM3201-ND). Note: Do not connect or disconnect the fan unless the outputs are either disabled or the VBB voltage is off.
5. If using the GUI, connect the USB cable to CN1 and a personal computer.
6. Turn the voltage supply on.

FAQ

• How can I change the motor supply voltage on the evaluation board?
  To change the motor supply voltage, adjust the settings on your power supply to the desired voltage level before connecting it to J2 on the evaluation board.

• What should I do if I want to interface an external A5947 with the evaluation board?
  Use SW1 to select whether the USB interface connects to the on-board A5947 or through CN2 to an external A5947.

• Can I connect the fan while the board is powered?
  No, it is recommended not to connect or disconnect the fan while the outputs are active or when the VBB voltage is on. Ensure all power is off before making any connections.

DESCRIPTION

This evaluation board is used to demonstrate the Allegro A5947GET three-phase sensorless fan driver IC.

FEATURES

• USB communications to allow a GUI to control the device via I2C
• Switch to program devices that have been embedded into a fan

EVALUATION BOARD CONTENTS

A5947GET Evaluation Board Configurations

General Specifications

CONFIGURING THE EVALUATION BOARD

SW1 controls whether the USB is interfacing with the on-board A5947 or through CN2 to an external A5947.

USING THE EVALUATION BOARD

EQUIPMENT REQUIRED

• Fan
• Voltage supply to power the fan
• Standard A Male to Mini B Male USB cable (not included)
• Personal computer for USB control (software required; see “Related Links”).

SETUP

1. Set the motor voltage supply to the intended voltage.

2. Turn off motor voltage supply.

3. Connect motor voltage supply to J2.

4. Connect the fan to either J1 (screw-down terminals) or CN3 (Molex 0022022035; Digikey WM3201-ND).
   Note: Do not connect or disconnect the fan unless the outputs are either disabled or the VBB voltage is off.

5. If using the GUI, connect the USB cable to CN1 and a per-sonal computer.

6. Turn the voltage supply on.

SCHEMATIC

LAYOUT

BILL OF MATERIALS

APEK5947GET-01-T Evaluation Board Bill of Materials

ELECTRICAL COMPONENTS

Designator| Quantity| Value| Description| Part Type| Footprint
C1, C2, C7, C8, C9| 5| 0.1 µF| 25 V Capacitor| Kemet C0805C104K3RACTU; Digikey 399-1168-1-ND| 0805
C3| 1| 4.7 µF| 35 V Capacitor| Chemi-Con EMZA350ADA4R7MD61G; Digikey 565-2553-1-ND| UCC D61 Cap
C4| 1| 0.01 µF| 50 V Capacitor| Yageo CC0805KRX7R9BB103; Digikey 311-1136-1-ND| 0805
C5| 1| 10 µF| 50 V Capacitor| Samsung CL32B106KBJNNWE; Digikey 1276-3388-1-ND| 1210
C6| 1| 100 µF| 50 V Capacitor| Chemi-Con EMZA500ADA101MHA0G; Digikey 565-2569-1-ND| UCC HA0
CN1| 1| –| USB Mini B Recepticle| EDAC 690-005-299-043; Digikey 151-1206-1-ND| EDAC 690-005-299-043
CN2, CN4| 7| –| Cut from 50-Pin Strip| Samtec TSW-150-07-T-S; Digikey SAM1035-50-ND| 3- Pin 0.1″ Connector,

4- Pin 0.1″ Connector

CN3| 1| –| Molex 3-Pin Verticle Recepticle| Molex 0022022035; Digikey WM3201-ND| Molex 3-Pin 4455-N Vertical
CP1, CP2, FG, nFAULT, OUTA, OUTB, OUTC, SCL, SDA, SPD, TEST, VBB, VBBIN, VCP, VREF| ****

15

| ****

–

| ****

Large Test Point

| ****

Keystone Electronics 5010; Digikey 36-5010-ND

| ****

PAD 57 125 TP HB

D1| 1| –| Schottky Diode| Diodes Inc. B240-13-F; Digikey B240-FDICT-ND| DO- 214AA
–| 4| –| Rubber bumper| 3M SJ-5303 (CLEAR);

Digikey SJ5303-7-ND

| Rubber bumper
J1| 1| –| 3-Pin Screw Down Connector| On Shore ED120/3DS; Digikey ED1610-ND| 3-Pin screw down connector
J2| 1| –| 2-Pin Screw Down Connector| On Shore Technology ED120/2DS; Digikey ED1609-ND| 2-pin screw down connector
L1| 1| –| Ferrite bead| Laird MI0805K400R-10; Digikey 240-2389-1-ND| 0805
–| 1| –| PCB| 85-0871-001 Rev. 2| –
R1, R2| 2| 27 Ω| 1/8 W Resistor| Vishay/Dale CRCW080527R0FKEA; Digikey 541-27 .0CCT-ND| 0805
R3, R4, R7| 3| 200 Ω| 1/8 W Resistor| Panasonic ERJ-6GEYJ201V; Digikey P200ACT-ND| 0805
R5, R6, R9, R10| 4| 4.99 kΩ| 1/8 W Resistor| Panasonic ERJ-6ENF4991V; Digikey P4.99KCCT-ND| 0805
RNET1| 1| 10 kΩ| 4 Isolated Resistors| CTS 744C083103JP;

Digikey 744C083103JPCT-ND

| CTS 744 Series
SW1| 1| –| Dual SPDT Switch| Grayhill 76STC02T; Digikey GH7720-ND| 76STC02T
U1| 1| –| Three-Phase Sensorless Motor Driver| A5947ET| 28-Pin ET
U2| 1| –| USB 8-Bit FIFO IC| FTDI FT240XS-R; Digikey 768-1127-1-ND| SSOP-24 (150 mil)
U3| 1| –| Dual N-CH FETs| Toshiba Semi SSM6N15AFU,LF; Digikey SSM6N15AFULFCT- ND| SOT-363
W1, W2| 2| –| 22 Gauge Bus Wire (300 mils above PCB)|  | Scope Ground

RELATED LINKS

• A5947 Product Page: https://www.allegromicro.com/en/products/motor-drivers/bldc-drivers/a5947
• Software Registration Site: http://registration.allegromicro.com/login

APPLICATION SUPPORT

For applications support contact, go to https://www.allegromicro.com/en /about-allegro/contact-us/technical-assistance and navigate to the appropriate region.

Copyright 2023, Allegro MicroSystems.

• Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products.
• Before placing an order, the user is cautioned to verify that the information being relied upon is current.
• Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.
• The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.
• Copies of this document are considered uncontrolled documents.

ABOUT COMPANY

• Allegro MicroSystems 955
• Perimeter Road
• Manchester, NH 03103-3353 U.S.A.
• www.allegromicro.com

References

• Allegro Customer Portal | Allegro MicroSystems
• Technical Assistance | Allegro MicroSystems
• Three-Phase Sensorless Fan Driver IC - A5947 | Allegro MicroSystems

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