Andino Smart Home IoT Circuit

A compact Wi-Fi and Bluetooth-enabled IoT smart home device designed for low-volume consumer deployment with USB/AC power.

Executive Summary

This reference design defines the system architecture, critical component candidates, risk register, and validation path for Consumer IoT Smart Home Device. It is a system-level design deliverable; verify critical claims with manufacturer evidence and prototype testing before production release.

Design Overview

Requirements Coverage

System Architecture

Power Topology: Dual AC Mains (90-264V) via Hi-Link module or USB 5V input fed into a common 5V rail, stepped down via LDO to 3.3V for the MCU and sensors.

Module List

Power Tree and Signal Interfaces

Design Schemes

Integrated AC-DC Power Module with Wi-Fi/BLE SoC ★

Ultra-compact smart home IoT device utilizing an onboard AC-DC module and USB 5V OR-ing, powered by an ESP32-C6 Wi-Fi/BLE SoC.

Trade-offs: Higher component density and thermal management considerations within <50x50mm footprint.

Key IC selection

main MCU and wireless SoC

• Need: Provide dual-protocol connectivity (Wi-Fi 6 and BLE 5) with sufficient processing power for smart home automation under low power consumption.
• Class: 32-bit RISC-V Wi-Fi/BLE Wireless Microcontroller SoC
• Shortlist: Espressif ESP32-C6 series, Realtek RTL8720Cx series
• Pick: Select commercial grade QFN32 package variant from distributor stock balancing price, availability, and integrated flash memory size.

AC-DC power supply module

• Need: Compactly convert universal AC mains voltage (90-264VAC) to an isolated 5V DC output fitting inside a <50x50mm enclosure.
• Class: Encapsulated PCB-mount AC-DC power module
• Shortlist: Hi-Link HLK-2M05, Mean Well IRM-02-5
• Pick: Select exact module MPN based on physical dimensions, output current rating (0.4A), and safety certification compliance.

3.3V LDO regulator

• Need: Regulate 5V down to 3.3V with high PSRR and low quiescent current to support sensitive RF circuits without adding excessive thermal overhead.
• Class: Low-Dropout (LDO) linear voltage regulator
• Shortlist: Richtek RT9013-33GB, Advanced Monolithic Systems AMS1117-3.3, Microchip MCP1825
• Pick: Select SOT-23-5 package variant with optimal thermal resistance and output current rating matching peak RF burst requirements.

Risk register

Bring-up and Validation Plan

1. Power-off inspection and rail resistance checks
2. Current-limited first power-up; verify every rail before enabling loads
3. Validate interfaces and timing one subsystem at a time
4. Run thermal, fault-injection, EMC pre-scan, and endurance tests for the target environment

Key Components

5/5 modules matched to real parts. See the BOM tab for the full component table.

Hi-Link HLK-2M05 AC-DC Power Module (HLK-2M05)

Candidate 1 matches the primary MPN HLK-2M05.

USB Type-C Port & Schottky Diode OR-ing (USB4105-GF-A)

The candidate's MPN (USB4105-GF-A) exactly matches the primary MPN and the manufacturer (Global Connector Technology / G

RT9013-33GB 3.3V LDO Regulator (RT9013-33GB)

Candidate 2 exactly matches the primary MPN RT9013-33GB and aligns with the preferred manufacturer profile.

Espressif ESP32-C6 Wi-Fi 6 + BLE 5 SoC (ESP32-C6-MINI-1-N4)

Candidate 2 (ESP32-C6FH4) matches the primary MPN prefix and is manufactured by Espressif Systems. Candidate 1 is a modu

Build Summary

• Difficulty: Advanced
• Estimated time: 6-8 hours
• Tools required: Antistatic mat, Digital multimeter, Solder stencil, Solder paste, Reflow oven or hot air station, Soldering iron

See the Build tab for the full step-by-step assembly guide.

Evidence and Limitations

• Confirm part parameters, certifications, and compatibility against current manufacturer documents.
• Treat industry compliance without test or certificate evidence as a compliance gap, not an approval.
• See Reference Images for visual artifacts and Build Guide for detailed assembly and bring-up steps.