Monolithic Power Systems Inc. EVCS1801-S-12-00A

Overview

EVCS1801-S-12-00A from Monolithic Power Systems is a linear Hall-effect current sensor evaluation board designed to demonstrate the MCS180XGS-12 current sensor IC, supporting 5V supply, ±12.5A primary current range, 160 mV/A typical sensitivity, differential Hall array for stray-field rejection, and galvanic isolation between primary conductor (IP+/IP−) and signal pins (VOUT, VCC, GND). It enables rapid validation of isolated current sensing in motor control and power supply designs.

For engineers reviewing the EVCS1801-S-12-00A datasheet, EVCS1801-S-12-00A pinout, EVCS1801-S-12-00A application, or EVCS1801-S-12-00A equivalent, this board provides hands-on characterization of bandwidth (100 kHz), output rise time (4 μs), conductor resistance (0.9 mΩ), isolation capability, and sensitivity linearity under real-world DC/AC current injection.

Technical Context

The EVCS1801-S-12-00A implements a fully assembled SOIC-8-based MCS180XGS-12 sensor with integrated primary copper path (IP+/IP−), enabling galvanic isolation up to 2.5 kVRMS. Its differential Hall array architecture actively rejects external magnetic interference while delivering ratiometric analog output (VOUT = 0.5 × VCC + Sens × IP).

Board-level design includes 0.1 µF and 4.7 µF ceramic decoupling capacitors (C1, C2), optional filter capacitor C4 (user-configurable for bandwidth tuning), and screw terminals for secure high-current connection. The 58 mm × 58.5 mm × 12 mm PCB supports direct bench testing without custom interface hardware.

Key Specifications

Availability

EVCS1801-S-12-00A is available at Aetrix Electronics and suitable for motor control validation, switch-mode power supply current loop prototyping, and automotive-grade load management system development requiring stable component supply and traceable evaluation hardware.

Supply support for EVCS1801-S-12-00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with expertise in DC/DC converters, LED drivers, and precision analog sensors.

The EVCS1801-S-12-00A belongs to MPS's current sensor evaluation platform targeting isolated, low-drift, wide-bandwidth current measurement in industrial and automotive power systems-designed to replace optocoupler-based solutions with higher reliability and lower drift.

FAQ

What is the purpose of the C4 capacitor on the EVCS1801-S-12-00A board?

C4 is an optional external filter capacitor that sets the sensor's bandwidth: increasing C4 capacitance reduces bandwidth to suppress high-frequency noise, while omitting C4 maintains the full 100 kHz bandwidth. Its value is user-selectable based on application noise requirements and response time needs.

Can the EVCS1801-S-12-00A be powered from 3.3 V instead of 5 V?

No - this specific board variant (EVCS1801-S-12-00A) is configured for 5 V operation only, as it pairs with the MCS180XGS-12 IC, which is rated for 5 V supply and ±12.5 A range. For 3.3 V operation, use EVCS1800-S-12-00A, which uses the MCS180XGS-12 variant specified for 3.3 V.

How is galvanic isolation achieved on this evaluation board?

Isolation is implemented via the MCS180XGS-12 IC's internal construction: the primary current path (IP+/IP−) is physically separated from the signal-side pins (VOUT, VCC, GND) by a molded SOIC-8 package with reinforced insulation, achieving 2.5 kVRMS isolation without external components.

What are the recommended test connections for measuring VOUT?

VOUT is accessed at pin 5 of U1 (MCS180XGS-12) or via the dedicated test pad labeled "VOUT" on the board. Use a high-impedance oscilloscope or DMM referenced to board GND; avoid loading VOUT with <100 kΩ to prevent gain error or offset shift.

Does the board include protection against reverse polarity or overvoltage on VCC?

No - the EVCS1801-S-12-00A has no reverse-polarity or overvoltage protection circuitry. Users must ensure clean, well-regulated 5 V DC input with correct polarity before powering; exceeding 5.5 V or reversing VCC/GND may permanently damage the MCS180XGS-12 IC.

What is the role of the screw terminals labeled IP+ and IP−?

IP+ and IP− are 4-pin Philips screw terminals providing low-inductance, high-current access to the primary conductor path inside the MCS180XGS-12. They carry the measured current (±12.5 A max) and are electrically isolated from all other board signals, forming the high-side current path for true galvanic sensing.