ASEK710 Demo Board Tutorial

Product Information
ACS710 Evaluation Board Getting Started Guide
Dear Customer:
Thank you for purchasing an Allegro® MicroSystems, Inc.,
product evaluation kit. This kit is intended for evaluation
use only, and is not intended for use in a production
environment.
The instructions in this kit are designed for use with the
following product evaluation boards:
• ACS710, PN: 85-0350-001, Rev. 5
This document includes:
• Top side layout of the evaluation board
• Bottom side layout of the evaluation board
• Electrical schematic of the evaluation board
• Basic instructions for completing a fault test using the
evaluation board
Additional information may be available on the Allegro
MicroSystems website page for the ACS710:
• Bill of materials of the evaluation board
• Gerber files of the evaluation board
• Datasheet for the ACS710
This document provides a basic guide for providing power
and signal to the evaluation board and product. The
datasheet provides the specific details about the product
to best understand how the product can be in a typical
application. If you should need any further assistance
please call 1-508-854-5428 or contact the field application
engineer for your area by visiting the Design Center >
Technical Assistance link on the Allegro MicroSystems
website.
– Allegro MicroSystems
Introduction
This evaluation board enable verification of the ACS710 functionality by simply powering on the board and connecting an
adjustable current source from board contacts IP+ to IP–.
The test points (TP) are identified in the following table. Refer to
the top-side layout diagram for locations on the board.
Test
Point
Name
TP1
Device
Pin Name
Creating a Fault Condition:
Resistors R2 (332 kΩ) and R3 (178 kΩ) on the evaluation board
create a resistive voltage divider that sets the overcurrent fault
threshold, input to the VOC pin. The installed resistor values set
VOC to be about 1/3 × VCC .
• For unidirectional current sensing this means that a fixed fault
threshold will occur at about:
▫ 32 A for the ACS710KLATR-12CB-T (Sens 56 mV/A)
Function
FAULT_EN Must be high to enable fault algorithm
▫ 64 A for the ACS710KLATR-25CB-T2 (Sens 28 mV/A)
In either case, the fault is tripped independently of VCC .
TP2
VOC
Sets fault threshold
TP3
VCC
Regulated voltage: 5 V with J2 open 3.3 V
with J2 closed
• For bidirectional current sensing this means that a fixed fault
threshold will occur at about:
TP4
FAULT
Overcurrent fault flag output
TP5
VIOUT
Analog voltage output; proportional to
current
▫ ±32 A for the ACS710KLATR-12CB-T (Sens 56 mV/A)
TP6
VFILTER
Filters the output of the device
TP7
VZCR
Zero-ampere current reference
TP8
GND
Ground
TP9
VIN
Board supply voltage: VCC + 3 V < VIN < 25 V
▫ ±64 A for the ACS710KLATR-25CB-T2 (Sens 28 mV/A)
To set a different current fault threshold, users can either apply
a voltage to VOC pin from an external source or place a potentiometer (R10) on the board. Refer to the Functional Description
section of the ACS710 datasheet for detailed information about
calculating VOC for the required fault level.
When the FAULT_EN pin is high, and the current threshold is
exceed, a fault condition will occur. LED D1 will turn on when
the fault is latched. See the datasheet for more details on the fault
algorithm, as well as how to reset the fault using FAULT_EN.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
Figure 1. Top-side layout of the evaluation board
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
Figure 2. Bottom-side layout of the evaluation board
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
Figure 3. Electrical schematic of the evaluation board
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
Copyright ©2012, Allegro MicroSystems, Inc.
The information contained in this document does not constitute any representation, warranty, assurance, guaranty, or inducement by Allegro to the
customer with respect to the subject matter of this document. The information being provided does not guarantee that a process based on this information will be reliable, or that Allegro has explored all of the possible failure modes. It is the customer’s responsibility to do sufficient qualification
testing of the final product to insure that it is reliable and meets all design requirements.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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