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The CH376S USB Module U Disk Read Write Board is a dedicated hardware solution that allows low-power microcontrollers to interact directly with standard USB flash drives and SD cards. Adding USB host functionality to an 8-bit or 32-bit microcontroller usually requires immense processing overhead and software USB stack management. The CH376S chip completely offloads this workload by embedding the complete USB communication protocol, USB host controller, and hardware-level FAT file parsing directly onto the silicon.

The board features a standard USB Type-A Female port for plugging in flash drives, alongside an onboard 12MHz crystal oscillator and a power indicator LED. It includes a 2x8 pin header array with jumpers to easily toggle between three communication modes: Parallel (8-bit bus), SPI, and Serial UART. Whether you are logging sensor data to a flash drive, loading configuration files, or updating firmware via USB, the CH376S makes file management simple with straightforward high-level commands (open file, create file, read, write, close).

Key Features and Benefits

• Hardware FAT File System Engine: Native support for FAT12, FAT16, and FAT32 file system structures allows direct file creation, reading, writing, and directory scanning.

• Triple Communication Modes: Supports UART (up to 3Mbps), SPI (up to 2MHz), and an 8-bit Parallel interface to match any microcontroller architecture.

• Integrated USB Host Stack: Automatically manages USB PHY signals, handshakes, and low-level block storage transfers without burdening your host MCU's CPU.

• Multi-Media Storage Compatibility: Capable of reading and writing to both USB mass storage devices (U-disks / Flash Drives) and SD/MMC cards.

• Onboard Power Regulation & Status: Includes a 3.3V LDO regulator, $12 ext{ MHz}$ crystal reference, and power LED for stable plug-and-play prototyping.

Technical Specifications

How to Configure & Wire

1. Interface Selection Jumpers:

The board features two mode-selection jumper configurations (labeled S1 and S2 or J1 / J2 near the header pins):

• Serial UART Mode (Default for Arduino): Both jumpers attached across the designated UART selection pins.

• SPI Mode: Remove/adjust jumpers as per datasheet tables to activate high-speed SPI bus transfers.

2. Arduino Wiring (Serial UART Mode):

• VCC: Connect to Arduino $+5 ext{V}$ rail.

• GND: Connect to Arduino $ ext{GND}$ common rail.

• TXD: Connect to Arduino Software Serial RX pin (e.g., Pin 10).

• RXD: Connect to Arduino Software Serial TX pin (e.g., Pin 11).

3. Basic Arduino Sample Code:

#include <SoftwareSerial.h>

// Setup SoftwareSerial for CH376S communication (RX, TX)
SoftwareSerial USBSerial(10, 11); 

void setup() {
  Serial.begin(9600);
  USBSerial.begin(9600);
  
  Serial.println("Initializing CH376S USB Read/Write Controller...");
  
  // Send IC Check command to verify communication
  USBSerial.write(0x57);
  USBSerial.write(0xAB);
  USBSerial.write(0x06); // CMD_CHECK_EXIST
  USBSerial.write(0x55); // Test byte
  
  delay(100);
  
  if (USBSerial.available()) {
    byte response = USBSerial.read();
    if (response == 0xAA) { // Returns bitwise inverted byte (0x55 -> 0xAA)
      Serial.println("CH376S USB Controller connected successfully!");
    } else {
      Serial.println("Communication error. Check connections or jumpers.");
    }
  }
}

void loop() {
  // Main application logic for mounting USB drive and opening files
}

Applications

• Industrial Data Logging: Logs high-volume telemetry data directly onto a standard removable USB pen drive for easy transfer to a PC.

• Standalone Firmware Flashing: Reads binary .bin or .hex update files off a flash drive to update remote microcontroller equipment in the field.

• Embedded Audio & Media Players: Reads audio files or configuration assets stored on USB sticks for embedded playback devices.

• Legacy Equipment Upgrade: Adds modern USB thumb drive storage compatibility to older 8051, PIC, or AVR embedded systems.

Package Includes

• 1 x CH376S USB Module U Disk Read Write Controller Board

• 2 x Mode Selection Jumper Caps (Pre-installed)

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components