Allegro Asek37002 Evaluation Board User Guide

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.

Figure 1: ASEK37002 Evaluation Board

EVALUATION BOARD CONTENTS

• ASEK37002 evaluation board

Table 1: ACS37002 Evaluation Board Configurations

USING THE EVALUATION BOARD

1. Prior to applying power to the ACS37002, configure the JP2 (GAIN_SEL0) and JP3 (GAIN_SEL1) shunts for the desired gain of the ACS37002.
2. 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.
3. 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.
4. Apply a current source to the IP+ and IP- banana jacks.
5. The ACS37002 output is monitored via the TPViout test point.
6. 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).

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.

Bill of Materials
Table 2: ASEK37002 Bill of Materials

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

Revision History

Copyright 2023, Allegro MicroSystems.
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 ensure that it is reliable and meets all design requirements.
Copies of this document are considered uncontrolled documents.
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References

• Allegro MicroSystems | Innovation with Purpose
• Open-Close-Loop-Accuracy-ACS720
• Hall-Effect Sensors | Allegro MicroSystems
• System Bandwidth in Complex Current Sensor Applications
• Secrets of Measuring Currents Above 50 Amps
• High-Current Measurement with Allegro Current Sensor
• Hall Effect Current Sensing in Electric and Hybrid Vehicles
• Hall Effect Current Sensing in Hybrid Electric Vehicle (HEV) Applications
• allegromicro.com/-/media/files/datasheets/acs37002-datasheet.ashx
• DC and Transient Current Capability/Fuse Characteristics of Surface Mount Current Sensor ICs
• Semiconductors | Products | Allegro MicroSystems
• ACS37002: 400 kHz, High Accuracy Current Sensor