EVB222-1.5
CT220BMV-IS5 Evaluation Board User Guide
DESCRIPTION
The EVB222-1.5 evaluation board is designed to demonstrate the current sensing capabilities of the CT220 linear magnetic sensor from Allegro MicroSystems. The CT220 is a contactless current sensor based on XtremeSense™ tunnel magnetoresistance (TMR)
technology. It features a full-bridge configuration comprising four TMR elements monolithically integrated with active CMOS circuitry, allowing it to have high resolution and low noise in a small-package footprint. This user guide describes how to connect and use the EVB2221.5 evaluation board.
FEATURES
- Field range: ±1.5 mT
- Gain: 300 mV/V/mT
- 3 V to 5 V power supply
EVALUATION BOARD CONTENTS
- EVB222-1.5 evaluation board
Table 1: EVB222-1.5 Evaluation Board Configurations
| Configuration Name | Part Number | B-Field | Gain |
| EVB222-1.5 | CT220BMV-IS5 | ±1.5 mT | 300 mV/V/mT |
Table 2: General Specifications
| Specification | Min. | Typ. | Max. | Units |
| Input Operating Voltage | 3 | 3.3 | 5 | V |
| Cutoff Frequency (3 dB) | – | 10 | – | kHz |
| Operating Temperature | –40 | – | 85 | °C |
USING THE EVALUATION BOARD
This section provides an overview of the connections and configuration options of the EVB222-1.5 evaluation board. Each group of connections highlighted in Figure 2 has a detail section below. The product datasheet contains detailed information about the use and functionality of each pin and should be consulted for more-detailed information than is contained in this user guide.
Power Input and Board Configuration
The two-pin male header connector is used to apply the bias voltage to the CT220 sensor. The four-pin male header on the PCB is used to measure the output. The voltage at the ANA pin (output) is proportional to the magnetic field present at the sensor. The EVB222-1.5 also has a resistor-capacitor (RC) filter-based low-pass filter with a 3 dB frequency of 10 kHz implemented. The filtered response to the magnetic field can be measured from the FILTER pin. The output on the FLAG pin changes state when the magnetic field exceeds ±1.35 mT (90% of the full-scale magnetic field range).
SCHEMATIC
The schematic of the EVB222-1.5 evaluation board is shown in Figure 3.
LAYOUT
The top and bottom layers of the EVB222-1.5 evaluation board are shown in Figure 4 and Figure 5.
BILL OF MATERIALS
Table 3: CT220BMV-IS5 Version Evaluation Board Bill of Materials
| Designator | Quantity | Description | Manufacturer | Manufacturer Part Number |
| ELECTRICAL COMPONENTS | ||||
| – | 1 | EVB222-1.5 EVAL PCB | Allegro MicroSystems | — |
| U$3 | 1 | CT220 Sensor | Allegro MicroSystems | — |
| FLAG, GND, VOUT, FILTER | 4 | Male Header Connectors | Samtec | TSW-104-07-F-S |
| GND, VCC | 2 | Male Header Connectors | Samtec | TSW-102-07-F-S |
| JP3 | 1 | Capacitor, Ceramic, 1.0 pF, 25 V, 10% X7R 0603 | TDK | MSAST168SB7105KTNA01 |
| C2 | 1 | Capacitor, Ceramic, 150 pF, 1 kV, 10% X5F 0603 | Vishay | 562R1OTST15 |
| R1 | 1 | Resistor, 105 kO, 1110 W, 1% 0603 | Vishay | TNPW0603105KBEEA |
CT220 Product Webpage:
https://www.allegromicro.com/en/products/sense/current-sensor-ics/sip-package-zero-to-thousand-amp-sensor-ics/ct220
Revision History
| Number | Date | Description |
| – | May 23, 2024 | Initial release |
| 1 | September 11, 2024 | Updated general specifications (page 1), updated evaluation board images (pages 1 and 2), removed busbar configuration (page 3), and updated BOM (page 5). |
Copyright 2024, 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.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Documents / Resources
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ALLEGRO CT220BMV-IS5 Linear Evaluation Board [pdf] User Guide CT220BMV-IS5, CT220BMV-IS5 Linear Evaluation Board, Linear Evaluation Board, Evaluation Board, Board |