Overview
The TUSB2046BIRHBTG4 is a USB hub device manufactured by Texas Instruments. It is designed to comply with the Universal Serial Bus (USB) specification, specifically as a full-speed hub. This device provides one upstream port and four downstream ports, making it suitable for various applications requiring USB connectivity and expansion.
The TUSB2046B is built using 3.3 V CMOS technology, ensuring low power consumption and high reliability. It supports external EEPROM for configuration and includes features such as downstream power switching and overcurrent reporting, which are essential for managing power and ensuring the safety of connected devices.
Key Specifications
| Parameter | Description | Recommendation |
|---|---|---|
| VCC33 | 3.3 V Positive Power Supply | 0.1 uF and 10 uF decoupling capacitors on each VCC pin to GND |
| GND | Ground | Connected to Ground |
| BUSPWR | Controls Downstream Facing Ports power source and indicator to USB Host | Connect 2KΩ pull down to GND for Self-powered mode |
| EXTMEMz | External EEPROM Indicator | EXTMEMz = 0, Connect to 3.3V if no external EEPROM is used. EXTMEMz != 0, Connect to GND to use external EEPROM |
| EECLK | EEPROM Serial Clock | EXTMEMz = 0, Leave pin floating (unconnected). EXTMEMz != 0, Connect to 3-state serial clock output from external EEPROM |
| EEDATA/GANGED | EEPROM Serial Data/ Power-management indicator | EXTMEMz = 0, Connect to data line of external EEPROM. EXTMEMz !=0, Connect to GND for per-port power overcurrent detection on downstream ports |
| SUSPND | Indicates suspend mode on downstream facing ports | Leave unconnected or connect to external power down logic. For normal operation, SUSPND is low. For suspend mode, SUSPND is high |
| TSTMODE | Determines 6-MHz or 48-MHz clock mode of TUSB2046B | Connect pin to GND for 6-MHz operation |
| TSTPLL/48MCLK | Test pin for 6 MHz internal clock or Input pin for 48 MHz external clock | Connect pin to GND for 6-MHz operation |
| XTAL1 | Crystal clock input | Using a 6-MHz crystal with 50% duty cycle, Connect the Crystal output to XTAL1 |
| XTAL2 | Crystal clock output | Using a 6-MHz crystal with 50% duty cycle, Connect the Crystal input to XTAL2 |
| RESETz | Device active low reset | Connect to Power-On Reset Circuitry. Must be asserted at power up |
| DM0, DP0 | Upstream or Root Differential Pair for USB Full Speed Communication | Connect DM0 and DP0 to D- and D+, respectively, to USB connector on upstream facing hub to USB host |
| DM[4:1], DP[4:1] | Downstream Differential Pair for USB Full Speed Port [4:1] | Connect DM1 and DP1 to D- and D+, respectively, to USB connector on downstream facing hub to USB device |
| OVRCUR[4:1] | Input for overcurrent event status on downstream port [4:1] | Connect to overcurrent indicator (FTL pin) on power switch for downstream port [4:1] to allow host control of downstream port power |
| PWRON[4:1] | Port [4:1] power control signals. Push-Pull output | Connect to power switch EN pin to allow host control of downstream port power and protection in overcurrent event |
Key Features
- USB Compliance: Compliant with the Universal Serial Bus (USB) specification as a full-speed hub.
- Port Configuration: One upstream port and four downstream ports.
- Power Management: Supports downstream power switching and overcurrent reporting.
- External EEPROM Support: Allows for configuration using an external EEPROM.
- Low Power Consumption: Built using 3.3 V CMOS technology for low power consumption.
- Clock Options: Supports both 6-MHz and 48-MHz clock modes.
- Suspend Mode: Indicates suspend mode on downstream facing ports.
- Reset Functionality: Active low reset pin for device initialization.
Applications
- USB Expansion Hubs: Ideal for creating USB expansion hubs that need to connect multiple devices to a single host.
- Embedded Systems: Suitable for use in embedded systems that require multiple USB ports for peripherals.
- Industrial Automation: Can be used in industrial automation environments where multiple USB devices need to be connected and managed.
- Consumer Electronics: Used in consumer electronics such as docking stations, USB hubs, and other USB-based devices.
- Medical Devices: Applicable in medical devices that require multiple USB connections for various peripherals.
Q & A
- What is the TUSB2046BIRHBTG4?
The TUSB2046BIRHBTG4 is a USB hub device from Texas Instruments that provides one upstream port and four downstream ports, compliant with the USB specification as a full-speed hub.
- What is the voltage requirement for the TUSB2046BIRHBTG4?
The device operates at 3.3 V.
- Does the TUSB2046BIRHBTG4 support external EEPROM?
Yes, it supports external EEPROM for configuration.
- How does the TUSB2046BIRHBTG4 manage power on downstream ports?
The device supports downstream power switching and overcurrent reporting to manage power on downstream ports.
- What clock modes does the TUSB2046BIRHBTG4 support?
The device supports both 6-MHz and 48-MHz clock modes.
- How is the reset function implemented on the TUSB2046BIRHBTG4?
The device has an active low reset pin that must be asserted at power up for device initialization.
- What are the typical applications of the TUSB2046BIRHBTG4?
Typical applications include USB expansion hubs, embedded systems, industrial automation, consumer electronics, and medical devices.
- How many downstream ports does the TUSB2046BIRHBTG4 provide?
The device provides four downstream ports.
- What is the purpose of the SUSPND pin on the TUSB2046BIRHBTG4?
The SUSPND pin indicates suspend mode on downstream facing ports.
- How should the BUSPWR pin be configured for self-powered mode?
For self-powered mode, connect the BUSPWR pin with a 2KΩ pull down to GND.
