Monolithic Power Systems Inc. EV6400DJ-00A

Overview

EV6400DJ-00A from Monolithic Power Systems is an evaluation board for the MP6400DJ programmable-delay supervisory IC, designed to validate voltage monitoring and RESET timing behavior in low-power embedded systems. It supports Vcc from 1.8V to 6V, monitors Vsen at 3.3V (adjustable down to 0.4V), delivers 100ms factory-set RESET delay, and includes manual reset (MR) control and external capacitor-based delay programming.

For engineers reviewing the EV6400DJ-00A datasheet, EV6400DJ-00A pinout, EV6400DJ-00A application, or EV6400DJ-00A equivalent, this board enables rapid validation of MP6400DJ's adjustable threshold, programmable delay (2.1ms–10s), MR logic interface, and low-quiescent-current supervision in battery-powered and FPGA/ASIC power sequencing contexts.

Technical Context

The EV6400DJ-00A implements a hardware-based voltage supervision solution centered on the MP6400DJ TSOT-6 IC, which compares Vsen against an internal reference and asserts RESET after a capacitor-determined delay. The board provides direct access to all critical signals: Vcc, Vsen, RESET, MR, and CDELAY.

It supports both adjustable and fixed-threshold configurations - R1/R2 form a voltage divider for Vsen tuning (e.g., 3.3V default), while C2 (10nF) sets the 100ms delay per MP6400DJ's 100ms/V·μF scaling factor. MR input accepts standard CMOS logic levels referenced to Vcc.

Key Specifications

Availability

EV6400DJ-00A is available at Aetrix Electronics and suitable for DSP/microcontroller power-up sequencing, FPGA/ASIC supply monitoring, and portable/battery-powered device validation requiring stable component supply and rapid prototyping capability.

Supply support for EV6400DJ-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 analog and power ICs, with core expertise in DC/DC conversion, LED drivers, motor drivers, and supervisory circuits.

The MP6400 product line delivers ultra-low-quiescent-current voltage supervisors with programmable delay and manual reset - engineered specifically for power-sensitive applications including handheld computing, wearables, and FPGA configuration sequencing.

FAQ

What is the purpose of the CDELAY pin on the EV6400DJ-00A?

The CDELAY pin connects to an external capacitor (C2 = 10nF on board) that sets the RESET timeout period per MP6400DJ's internal current source. With 10nF installed, delay is 100ms; changing capacitance linearly adjusts delay between 2.1ms and 10s, enabling precise power-rail timing validation without firmware changes.

Can the monitored voltage threshold be changed from the default 3.3V?

Yes. The board uses R1 (143kΩ) and R2 (20kΩ) as a voltage divider on the Vsen input. Replacing R1 allows adjustment of the trip point anywhere from 0.4V upward - for example, 1.8V monitoring requires R1 ≈ 70kΩ when R2 remains 20kΩ, per the formula provided in the Quick Start Guide.

Does the EV6400DJ-00A support both active-high and active-low RESET outputs?

No. The MP6400DJ IC on this board provides only active-low open-drain RESET output, pulled up externally via onboard 10kΩ resistor (R3). To implement active-high behavior, an external inverter or pull-down configuration is required - the board itself does not include dual-polarity RESET logic.

Is the MR (Manual Reset) function operational by default?

Yes. MR is internally pulled up to Vcc via a 90kΩ resistor inside the MP6400DJ, so floating MR asserts RESET release. Applying <0.25×Vcc to MR forces RESET assertion regardless of Vsen status - enabling system-level reset initiation during debug, recovery, or user-triggered events.

What is the role of the "Do Not Stuff" components listed in the BOM?

R4, R6, R7, and M1 are omitted to simplify the reference design and avoid interference with core supervision functionality. Their presence would alter biasing, add parasitic paths, or enable unsupported features - leaving them unpopulated ensures predictable timing, threshold accuracy, and MR response per MP6400DJ's intended operation.