IC-Mart Your Trusted Source for I/O Controller Interface Chips

(from leading manufacturers)

Leading Global Manufacturers

Manufacturer	Category	Typical Models	Description & Key Features
1. NXP	I/O Expanders	PCF8574 / PCF8575	Classic 8/16-bit I2C to parallel expanders. Industry standard for LCD driving.
		PCA9555 / PCA9535	16-bit I2C expander with interrupt output. Supports wider voltage ranges.
	UART Controllers	SC16IS750	I2C/SPI to single UART bridge with a 64-byte FIFO.
	Bus Bridges	UJA1169	Automotive-grade CAN System Basis Chip (SBC) with integrated controller and transceiver.
2. TI	I/O Expanders	TCA9539 / TCA9555	Low-voltage 16-bit I2C expanders with configuration registers.
	USB Controllers	TUSB2046B	Standard 4-port USB 2.0 full-speed Hub controller.
	Industrial I/O	TIOL112	IO-Link physical layer transceiver for industrial sensor communication.
	Bus Bridges	XIO2001	PCIe-to-PCI bus bridge, commonly found in industrial motherboards.
3. ADI / Maxim	I/O Expanders	MAX7313 / MAX7318	16-bit expanders with PWM for LED brightness control and hot-swap protection.
	Specialized Controllers	MAX7360	I2C keypad scanner managing up to 64 keys with integrated LED drivers.
	Digital Input	MAX22190	Industrial 8-channel serial input digital controller (IEC 61131-2 compliant).
4. FTDI Chip	Protocol Bridges	FT232RL	The classic USB-to-UART chip. Built-in EEPROM; requires no external crystal.
		FT2232H / FT4232H	High-speed USB 2.0 to dual/quad UART, SPI, or I2C bridges.
	Protocol Bridges	FT4222H	Specialized high-speed USB 2.0 to SPI/I2C bridge.
5. Microchip	I/O Expanders	MCP23017 / MCP23S17	Popular 16-bit expanders (017 for I2C, S17 for SPI).
	USB Controllers	USB5744	Industrial-grade USB 3.1 Gen 1 Smart Hub controller.
	Ethernet I/O	ENC28J60	Standalone Ethernet controller with an SPI interface.
6. WCH	Protocol Bridges	CH340 / CH341	Massively popular USB-to-UART/Parallel chips for dev boards and debuggers.
	Bus Bridges	CH382	PCIe-to-Dual Serial and Parallel port controller for PC expansion cards.
	High-Speed Controllers	CH347	High-speed USB to Quad UART/SPI/I2C/JTAG multi-function bridge.

Top Chinese Manufacturers (Domestic Substitution)

1. WCH (Nanjing Qinheng Microelectronics)

A leader in domestic interface ICs. Known for high cost-performance and stability. Their chips are standard in Chinese industrial converters and MCU development.

• CH340 / CH341: Ubiquitous USB-to-UART/SPI/I2C bridges.
• CH423: 24-bit remote I/O expander (I2C compatible) for LED and keypad matrices.
• CH432: Dual UART expander (SPI/Parallel interface).
• CH395: Ethernet controller with a hardware TCP/IP stack.

2. Awinic

Strong presence in mobile and consumer electronics. Features ultra-small footprints and low power consumption.

• AW9535 / AW9555: 16-bit I2C/SMBus expanders. Perfect drop-in replacements for NXP’s PCA9535/55.
• AW9523B: 16-channel I2C GPIO expander with 256-level linear dimming for LEDs.

3. Chipsea

A key player in the PC supply chain. They successfully broke the monopoly on laptop Embedded Controllers (EC).

• CSCE2010: High-performance 32-bit EC chip for power, keyboard, and thermal management.
• CS8M32x Series: Industrial I/O SoC with high-precision ADC for instrumentation.

4. Sinowealth

Dominates white goods, small appliances, and PC peripherals (keyboards/mice).

• XA2001: USB keyboard controller with 36 integrated GPIOs.
• SH79F Series: Industrial 8-bit MCUs with rich I/O and communication protocols.

5. Belling

A veteran firm focused on industrial interfaces (RS485/RS232) and display drivers.

• BL3085 / BL1587: Industrial RS-485 transceivers. Comparable to Maxim’s MAX485.
• BL55088: Universal LCD driver/controller via I2C.

6. Beijing Taixi

Focused on high-performance protocol replacement.

• DT232RL: Fully compatible with the FTDI FT232RL. Allows for direct replacement without PCB redesign.

7. SITCORE

Specializes in automotive and industrial bus transceivers.

• SIT1042 / SIT1044: CAN transceivers widely used in EV power systems.
• SIT1021: LIN transceivers for automotive door and mirror control.

Selection Guide for Chinese ICs

Scenario	Recommended Chinese Brands	Notes
General Debugging (USB-Serial)	WCH, Beijing Taixi	Best cost-performance; excellent driver support.
Mobile/Wearables (Small GPIO)	Awinic	Tiny packaging (QFN/WLCSP); ultra-low power.
PC/Laptops (EC/Super I/O)	Chipsea	Major domestic alternative to ITE/Nuvoton.
Home Appliances/Keyboards	Sinowealth	High consistency; long product lifecycles.
Industrial/Auto (CAN/485)	SITCORE, Belling	High ESD protection and thermal stability.

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I/O Controller Interface IC Core Functions & Application Scenarios

1. Core Functions

• Protocol Conversion (Bridging): Translating one protocol to another (e.g., USB to UART).
• Port Expansion: Adding dozens of control pins when the MCU’s GPIOs are exhausted.
• Level Shifting: Resolving voltage mismatches (e.g., a 1.8V CPU controlling a 5V motor).
• Offloading: Handling “tedious” tasks like keypad scanning or LED PWM, freeing up the main CPU.

2. Key Use Cases

• Industrial B2B: Used in PLCs and CNC machines to coordinate hundreds of sensors and actuators.
• PC Peripherals: Found in every USB Hub and laptop Embedded Controller (EC).
• Consumer Electronics: Managing haptic feedback motors in smartphones or relay switches in smart home devices.
• Automotive: Handling CAN/LIN communication for doors, mirrors, and infotainment systems.

Master Classification Table

Category	Logical Function	Typical Models	Leading Brands
1. GPIO Expanders	Expands GPIOs via I2C/SPI for switches, LEDs, or digital signals.	PCF8574, MCP23017, TCA9534	NXP, Microchip, TI
2. UART Controllers	Manages asynchronous serial data flow for industrial/embedded systems.	TL16C752, SC16IS750, MAX3107	TI, NXP, ADI
3. Bridge ICs	Protocol “translation” (e.g., USB-to-UART or SPI-to-Bus).	FT232RL, CP2102, CH340	FTDI, Silabs, WCH
4. USB Controllers	Manages USB stacks, hubs, and physical layer interfaces.	TUSB2046B, USB5744, CY7C68013A	TI, Microchip, Infineon
5. Bus Controllers	High-speed PCIe/PCI expansion and bridging for industrial PCs.	PI7C9X2G304, CH382, XIO2001	Diodes, WCH, TI