ALLEGRO ASEK37002 Evaluation Board User Guide

: June 10, 2024
: ALLEGRO

Table of Contents

DESCRIPTION
FEATURES
EVALUATION BOARD CONTENTS
USING THE EVALUATION BOARD
SCHEMATIC
LAYOUT
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

ASEK37002 Evaluation Board
User Guide

DESCRIPTION

This user guide documents the features, operation, and use of the ACS37002 current sensor with the ASEK37002 demo board. This evaluation kit provides users with a simple means of evaluating the ACS37002 current sensor in a lab environment without the need of a custom-designed evaluation board.

FEATURES

The ACS37002 is a fully integrated Hall-effect current sensor in a SOIC16 package with 0.85 mΩ integrated conductor. The sensor is factory-trimmed to provide high accuracy over the entire operating range. A fast overcurrent alert fault output has a user-configurable threshold via an analog input pin, providing short-circuit detection and enhanced system protection. The sensor also has four programmable gain settings.

ALLEGRO ASEK37002 Evaluation Board - FIg Figure 1: ASEK37002 Evaluation Board

EVALUATION BOARD CONTENTS

ASEK37002 evaluation board

Table 1: ACS37002 Evaluation Board Configurations

Configuration Name| Part Number| Current Sensing Range, IPR (A)| Sensitivity (mV/A)| Supply Voltage (V)
---|---|---|---|---
ASEK37002LMA-BB-3B| ACS37002LMA-BB-3B| –| –| 3.3
ASEK37002LMA-BB-5B| ACS37002LMA-BB-5B| –| –| 5
ASEK37002LMC-050B5| ACS37002LMC-050B5| ±33.3, ±40, ±50, ±66.7| 60, 50, 40, 30| 5

USING THE EVALUATION BOARD

Prior to applying power to the ACS37002, configure the JP2 (GAIN_SEL0) and JP3 (GAIN_SEL1) shunts for the desired gain of the ACS37002.
Apply power to the board. VCC of the ACS37002 device can be supplied directly or via an on board regulator. In either case, the user will provide power to the evaluation board through the TPVin test point. A. Powering the ACS37002 with the on-board regulator: With the JP1 shunt placed in the “Vreg” position, power is supplied to the device by the on-board regulator. To allow for the dropout voltage of the regulator, it is recommended that the voltage supplied to the TPVin test point is equal to VCC + 1 V. For example, using the 5 V on board regulator to supply a 5 V version of the ACS37002 would require a voltage of >6 V supplied to the TPVin test point. B. Powering the ACS37002 directly: with the JP1 shunt placed in the “Vin” position, power is supplied to the ACS37002 directly via the TPVin test point. In this case, the user would provide a 5 V supply to a 5 V version of the device, or a 3.3 V supply to a 3.3 V version.
Configure JP4 to apply a voltage to the VOC pin of the ACS37002. The voltage applied to VOC selects the Overcurrent Fault trip point by applying a voltage to the VOC pin of the ACS37002. JP4 can be configured to ground VOC, apply a voltage from a resistive divider derived from Vref and the R4 potentiometer, or a directly driven voltage on the TPin test point.
Apply a current source to the IP+ and IP- banana jacks.
The ACS37002 output is monitored via the TPViout test point.
The Overcurrent Fault output is monitored via the TPFLT test point.

Refer to the ACS37002 datasheet for electrical and performance specifications as well as detailed functional operation guidelines.

SCHEMATIC

The schematic for the ASEK37002 is shown in Figure 2. Boards will vary based on the version of the ACS37002 populated in the board and which a regulator is required to supply power to the ACS37002 (3.3 V or 5 V). These differences are reflected in the BOM (bill of materials).

ALLEGRO ASEK37002 Evaluation Board - FIg 1

Figure 2: ASEK37002 Schematic

LAYOUT

The ASEK37002 demo board consists of two layers. Top and bottom layers are shown in Figure 3 and Figure 4, respectively.

ALLEGRO ASEK37002 Evaluation Board - FIg 2

Bill of Materials
Table 2: ASEK37002 Bill of Materials

Reference Designator	Description
U1	ACS37002
U2	IC, LP2980AIM5, SOT-23-5, 3.3 V or 5 V regulator depending on ACS37002

RELATED LINKS
The ACS37002 product datasheet is available for download on the Allegro website. In addition, several application notes and related information is available. This information is listed in the table below.

Table 3: Related Documentation and Application Notes

Documentation	Summary	Location
ACS37002	Product datasheet defining common electrical characteristics and
performance characteristics

https://www.allegromicro.com/-/media/files/ datasheets/acs37002-datasheet.ashx
ACS37002 Purchasing| Purchasing homepage| https://www.allegromicro.com/en/products/ sense/current-sensor-ics/zero-to-fifty- amp- integrated-conductor- sensor-ics/acs37002
An Effective Method for Characterizing System Bandwidth in Complex Current Sensor Applications| Application note describing methods used by Allegro to measure and quantify system bandwidth| https://allegromicro.com/en/insights- and- innovations/technical-documents/hall- effect- sensor-ic-publications/an- effective-method-for- characterizing-system- bandwidth-an296169
DC and Transient Current Capability/Fuse Characteristics of Surface Mount Current Sensor ICs| DC and Transient Current Capability/Fuse Characteristics of Surface Mount Current Sensor ICs| https://www.allegromicro.com/en /Insights-and- Innovations/Technical-Documents /Hall-Effect- Sensor-IC-Publications/DC-and- Transient- Current-Capability-Fuse- Characteristics.aspx
ACS37002 Gerber Files| Schematic files containing demo board layers| https://www.allegromicro.com/-/media/allegro/ allegromicro/files/gerber- files/asek37002_ gerber_files.ashx
High-Current Measurement with Allegro Current Sensor IC and Ferromagnetic Core: Impact of Eddy Currents| Application note focusing on the effects of alternating current on current measurement| https://allegromicro.com/en /insights-and- innovations/technical- documents/hall-effect- sensor-ic- publications/an296162a1367 current-sensor-eddy- current-core
Secrets of Measuring Currents Above 50 Amps| Application note regarding current measurement greater than 50 A| https://allegromicro.com/en/insights- and- innovations/technical-documents/hall- effect- sensor-ic-publications/an296141-secrets- of- measuring-currents-above-50-amps
Allegro Hall-Effect Sensor ICs| Application note describing Hall-effect principles| https://allegromicro.com/en/insights- and- innovations/technical-documents/hall-effect- sensor-ic-publications/allegro- hall-effect-sensor- ics
Hall-Effect Current Sensing in Electric and Hybrid Vehicles| Application note providing a greater understanding of hybrid electric vehicles and the contribution of Hall-effect sensing technology| https://allegromicro.com/en /insights-and- innovations/technical-documents /hall-effect- sensor-ic-publications/hall-effect- current- sensing-in-electric-and-hybrid- vehicles
Hall-Effect Current Sensing in Hybrid Electric Vehicle (HEV) Applications| Application note providing a greater understanding of hybrid electric vehicles and the contribution of Hall-effect sensing technology| https://allegromicro.com/en/insights- and- innovations/technical-documents/

hall-effect-sensor-ic-publications/hall-effect- current-sensing-in-hybrid-electric-vehicle- hev- applications

Achieving Closed-Loop Accuracy in Open-Loop Current Sensors| Application note regarding current sensor IC solutions that achieve near closed-loop accuracy using open-loop topology| https://allegromicro.com/en/insights- and- innovations/technical-documents/hall- effect- sensor-ic-publications/achieving-closed- loop- accuracy-in-open-loop-current- sensors
Allegro Current Sensor ICs Can Take the Heat! Unique Packaging Options for Every Thermal Budget| Application note regarding current sensors and package selection based on thermal capabilities| https://allegromicro.com/-/media/allegro/ allegromicro/files /application- notes/an296190- current-sensor- thermals.ashx

Revision History

Number	Date	Description
–	June 25, 2020	Initial Release
1	August 31, 2020	Updated links in Table 2
2	December 11, 2020	Updated Table 2
3	April 21, 2022	Updated Figure 1-4; minor editorial updates
4	April 18, 2023	Minor editorial updates

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