Sonoff PSF-B04

PSF-B04 Application Guide
1.Product Introduction
PSF-B04 is a 4-channel ultra-low-power Wi-Fi switch module based on ESP8285. It’s
specially designed for mobile devices and Internet of Things applications with the most
competitive package size and ultra-low energy consumption technology in the industry.
Connecting users’ devices to the Wi-Fi wireless network for remote or local area network
communication to achieve networking. This module can be used as a switch control for 4
household appliances. Either it can be controlled by the device button, or remotely
controlled by connecting to APP (eWeLink).
PSF-B04 has various packaging methods, and the antenna supports ceramic
antennas. It can be widely used in smart grid, smart transportation, smart home,
handheld devices, industrial control and other fields.
Product Features:
• Built-in 32bit MCU, and can double as an application processor
• Support wireless 802.11 b/g/n standard
• Wi-Fi @2.4 GHz, support WPA/WPA2 security mode
• +20.5dBm maximum outputpower in 802.11b mode
• Support devicebutton control
• Support timer schedule
• Support Wi-Fi remote control
• Support compatible pairing mode /quickpairing mode
• Support OTA upgrade
2.Electrical Characteristics
2.1 Rated parameters
Conditions: VDD=3.3V±10% , GND=0V; test at room temperature 25°C.
Type
Parameters
Model
PSF-B04
Main chip
ESP8285
Hardware interface
UART, GPIO
Operating Voltage
2.7V~3.6V

Sonoff PSF-B04 Specifications

General

Brand	Sonoff
Model	PSF-B04
Category	Wireless Router
Language	English

Summary

1. Product Introduction

2. Electrical Characteristics

2.1 Rated Parameters

Lists model, main chip, hardware interface, operating voltage, etc., for electrical specs.

2.2 Wi-Fi Parameters

Details wireless standard, frequency range, encryption mechanisms, and firmware upgrade methods.

3. Module Type and Pin Definition

3.1 Module Type

Shows a top view diagram of the PSF-B04 module.

3.2 Pin Arrangement Sequence

Describes pin arrangement for switch control, status light, and UART.

3.3 Pin Definition

Details pin numbers, names, and their specific functions and features.

4. Function Description

4.1 Module Function

Explains the 4-channel switch functionality for local or remote control via APP.

4.2 Wi-Fi Status Indicator Light

Describes the meaning of different Wi-Fi status light flashing modes.

4.3 Wi-Fi Module Workflow

Outlines the configuration and online connection process for the Wi-Fi module.

4.4 Timer Function

Lists the four types of timer functions available for device scheduling.

4.5 Timer Function Description

Explains single, countdown, and repeat timer modes for flexible device operation.

5. Wi-Fi Radio Frequency Index

5.1 Sensitivity

Details the receiving sensitivity performance across various Wi-Fi standards and data rates.

5.2 Adjacent Frequency Suppression

Provides data on adjacent frequency suppression for OFDM and HT modes.

6. PCB Design

7. Packaging Information