ALLEGRO ACS37610 Coreless Current Sensor
TLHALOSO
- This user guide documents the features, operation, and use of the ACS37610OK current sensor with the corresponding evaluation board. Allegro MicroSystems offers evaluation board units that offer a method for rapid evaluation of the Allegro current sensor in a lab environment, without the requirement for a custom circuit board. The evaluation board is used to evaluate the functionality of the ACS37610OK, an economical and precise solution for AC and DC sensing in busbar and high-current printed circuit board (PCB) applications. Applied current through a busbar or PCB generates a magnetic field that is sensed by the Hall integrated circuit (IC). The ACS37610OK outputs an analog signal that varies linearly with the field sensed within the range specified. Differential sensing topology virtually eliminates error from common-mode stray magnetic fields. High isolation is achieved via the noncontact nature of this assembly. This guide includes a schematic of the ACS37610OK evaluation board (EVB), measurement and operation techniques, PCB layouts, and a bill of materials (BOM). The test equipment document (TED) and description of each board for which this document is applicable are listed in Table 1.
LIKAROLOANA
- The evaluation board and programming board listed in Table 1 can be used for the evaluation of all gain options of the ACS37610OK, allowing for streamlined and fast evaluation of the device. The ACS37610 evaluation board features test points for ease of access to the device pins. The evaluation board is multilayered, which allows for improved thermal performance, better power distribution, and greater signal integrity.
LEBOTO TS'ELA
- The ACS37610OK evaluation board consists of two layers, shown in the Layout section. An image of the complete evaluation board is shown in Figure 1. A detailed list of components is provided in the Bill of Materials (BOM) section.
Table 1: Evaluation Board Configurations
SEBELISA LEBOTO LA TEKANO
Likamano tsa Boto ea Tlhahlobo
- NOTE: Board appearance varies by board configuration. Concepts remain applicable. The supply voltage VCC may be applied across the VCC and GND test points. The ACS37610 analog output VOUT may be observed by attaching an oscilloscope probe or digital multimeter (DMM) to the OUT test point. The FAULT output may be observed by attaching an oscilloscope probe or DMM to the FAULT test point. These connections are shown on the ASEK37610 busbar evaluation board for reference, in Figure 2.
- High current may be applied directly to the busbar using the current connection screws. The high-current connections are shown on the evaluation board for reference in Figure 3. If a busbar is not used and a PCB sensing ASEK37610 evaluation board is used, current connections are applied to banana jacks (I_IN and I_OUT) on the PCB.
Litekanyo tse Tloaelehileng
- Boto ea tlhahlobo ea ASEK37610 e bohlokoa ha e lekanya litšobotsi tsa sesebelisoa joalo ka quiescent output vol.tage, VOUT(Q), and sensitivity, sens. To measure the ACS37610 quiescent output voltage, etsa bonnete ba hore sesebelisoa se tsamaisoa ho sebelisoa phallo e nepahetsengtage, typically 3.3 V or 5 V. Using an oscilloscope to view the output waveform, or a multimeter to view tlhahiso voltage level, verify the VOUT pin on the evaluation board is VCC/2 (for bidirectional devices) or VCC/10 (for unidirectional devices). For example, in the case of a bidirectional output device with nominal VCC = 5 V, verify that VOUT(Q) = 2.5 V.To measure device sensitivity, first ensure the evaluation board is powered using the VCC and GND test points. After confirming that the device is powered, measure the device’s quiescent output voltage. To do so, apply a known current (IP) to the device and measure the device output. To calculate device sensitivity, use: Equation 1—Measured Sensitivity Calculation: sens mV = VOUT [V] − VOUT (Q)[V] IP [A] ×1000
Calculating Full-Scale Current Range Using CF and IC Sensitivity.
- The ACS37610 is currently offered in several different gain selections: 5 mV/G, 10 mV/G, or 20 mV/G. The full-scale current-sensing range of the device depends on the sensitivity of the sensor and the design of the reference busbar or PCB. To calculate the maximum current-sensing range, the coupling factor (CF) and IC sensitivity must be known. For example, for the case of a coupling factor of 0.21 G/A, device sensitivity of 10 mV/G, and desired output voltage swing of 2000 mV, the maximum current sensing range is calculated as: Equation 2—Full-Scale Current Calculation:2000 mV× G 10 mV × A 0.21 G = 952 A For the example in Equation 2, the maximum current sensing range is 952 A.
Busbar Design Recommendations, GUI
- For busbar design recommendations, refer to the Allegro application note Guidelines for Designing a Busbar with Notch for Allegro’s Coreless AS37612 Differential Current Sensor (https://www.allegromicro.com/-/media/allegro/allegromicro/files/application-notes/ an296188-ACS37610-guidelines-for-designing-a-busbar-web.ashx), in conjunction with the Allegro interactive busbar design tool in the ACS37610 Samples Programmer on the ACS37610 webleqephe (https://allegromicro.com/en/products/sense/current-sensor-ics/sippackage-zero-to-thousand-amp-sensor-ics/ACS37610).
- Inputs to the GUI include part number, bus width, bus thickness, notch width, and air gap. For PCB sensing design recommendations, refer to the Coreless PCB Calculator, located in the Design Support Tools section of the ACS37610 webleqephe (https://allegromicro.com/en/products/sense/current-sensor-ics/sip-package-zero-to-thousand-amp-sensor-ics/ ACS37610).
MOEKETSI
The ACS37610OK schematic is shown in Figure 4.
TLALO
The ACS37610OK evaluation board layout is shown in Figure 5.
BILL OF MATERIALS (BOM)
- The ACS37610OK evaluation board bill of materials is shown in Table 2.
- Table 2: ACS37610OK Evaluation Board Bill of Materials
LIEKETSENG TSE HLAHANG
- Sehlahisoa web leqephe: https://www.allegromicro.com/en/products/sense/current-sensor-ics/field-current-sensors/acs37610
TS'ELISO TS'ELISO
- Tšehetso ea kopo web leqephe: https://www.allegromicro.com/en/about-allegro/contact-us/technical-assistance
- Tšehetso ea thekiso web leqephe: https://go.allegromicro.com/contact-sales
Nalane ea Phetoho
- Copyright 2025, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detailed 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.
- Allegro MicroSystems
- 955 Perimitha Road
- Manchester, NH 03103-3353 USA
- www.allegromicro.com
LBH
1. What is the purpose of the ACS37610OK Evaluation Board?
The evaluation board allows for rapid evaluation of the Allegro current sensor in a lab environment without needing a custom circuit board.
2. How can I measure quiescent output voltage using the evaluation board?
To measure VOUT(Q), ensure correct supply voltage, view output waveform with an oscilloscope, or check output level with a multimeter at the VOUT pin.
3. What does sensitivity measurement involve?
Sensitivity measurement requires applying a known current to the device, measuring the output, and calculating sensitivity using a specific formula.
Litokomane / Lisebelisoa
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