Monolithic Power Systems Inc. EVCS1800-S-12-00A

Overview

EVCS1800-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 ±12.5 A primary current sensing at 3.3 V supply, with typical sensitivity of 110 mV/A, differential Hall array for stray-field rejection, and galvanic isolation between primary conductor and signal pins.

For engineers reviewing the EVCS1800-S-12-00A datasheet, EVCS1800-S-12-00A pinout, EVCS1800-S-12-00A application, or EVCS1800-S-12-00A equivalent, this board enables rapid validation of AC/DC current measurement accuracy, bandwidth (up to 100 kHz), output linearity, and isolation performance in motor control, power supply monitoring, and over-current protection circuits.

Technical Context

The EVCS1800-S-12-00A implements the MCS180XGS-12 IC in SOIC-8 package, featuring a differential Hall sensor array that rejects external magnetic interference while measuring bidirectional current through an integrated 0.9 mΩ primary conductor. It operates at 3.3 V supply and delivers ratiometric analog output (VOUT = 0.5 × VCC + Sens × IP) centered at 1.65 V.

Board-level design includes decoupling capacitors (C1: 0.1 µF, C2: 4.7 µF), optional filter capacitor C4 to adjust bandwidth, and screw terminals (IP+, IP−) rated for high-current connection. The galvanic isolation barrier exceeds 2.5 kVRMS, enabling replacement of optocouplers in isolated current feedback paths.

Key Specifications

Availability

EVCS1800-S-12-00A is available at Aetrix Electronics and suitable for motor control validation, switch-mode power supply current monitoring, and over-current fault protection prototyping requiring stable component supply and traceable evaluation hardware.

Supply support for EVCS1800-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, including DC/DC converters, LED drivers, and precision analog sensors.

The EVCS1800-S-12-00A belongs to MPS's current sensing evaluation platform for the MCS180X family-designed to accelerate development of isolated, high-accuracy current feedback in automotive-grade and industrial power systems.

FAQ

What is the primary current range supported by the EVCS1800-S-12-00A?

This evaluation board is configured for the MCS180XGS-12 IC and supports ±12.5 A primary current measurement with full-scale linearity and <1% total error across temperature. The board's screw terminals accept up to 12 AWG wire, and the internal conductor handles continuous current without derating at 25°C ambient.

Does the board provide true galvanic isolation?

Yes-the MCS180XGS-12 IC on this board provides reinforced galvanic isolation rated at 2.5 kVRMS between the primary current path (IP+, IP−) and the low-voltage signal side (VCC, GND, VOUT). No external isolation components are required for basic functional safety compliance in IEC 62368-1 applications.

How is bandwidth adjusted on this evaluation board?

Bandwidth is controlled via capacitor C4: open circuit yields maximum 100 kHz bandwidth; adding capacitance reduces bandwidth per RC filtering. The board includes footprint space for C4 but no populated part-users select value based on noise vs. response trade-off (e.g., 1 nF → ~16 kHz, 10 nF → ~1.6 kHz).

Can this board operate at 5 V supply?

No-EVCS1800-S-12-00A is specifically configured for 3.3 V operation and matches the MCS180XGS-12 variant. For 5 V supply, use EVCS1801-S-12-00A (same ±12.5 A range, 160 mV/A sensitivity). Supply voltage mismatch risks incorrect output offset and reduced dynamic range.

What is the role of the differential Hall array on this board?

The differential Hall array cancels uniform external magnetic fields (e.g., from nearby inductors or cables), improving common-mode rejection by >40 dB. This allows accurate current measurement in magnetically noisy environments like motor drives or multi-phase inverters without shielding.

Is the output voltage ratiometric to supply voltage?

Yes-VOUT = 0.5 × VCC + Sens × IP. At 3.3 V supply, quiescent output is 1.65 V; a +12.5 A input yields ~3.03 V, and −12.5 A yields ~0.27 V. This ratiometric behavior maintains accuracy when VCC varies within ±5%, and simplifies interfacing with ratiometric ADCs.