Setup

3.1 Setup

The USB keyboard/hub EVM is designed to allow evaluation of the TUSB2136 and the TPS2149 device. Test points and 0-Ω resistors are provided to simplify the evaluation process (see section 3.5). The EVM comes in a default configuration that requires no additional components, other than the required hardware and software identified in Section 1.1 of this user’s guide. For a complete description of the TUSB2136 and the TPS2149 devices, consult the TUSB2136 and the TPS2149 data sheets (literature numbers SLLS442 and SLVS401, respectively).

3.2 Interfaces and USB Ports

The EVM uses a standard Type-B connector for the upstream port and two single Type-A connectors for the downstream ports. Power to the downstream ports is provided from the upstream USB 5-V source through the TPS2149.

Two edge connectors, J3 and J4, connect to the TUSB2136 general-purpose I/O lines. Out of 32 general-purpose I/O lines, 26 are brought out to the J3 and J4 connectors. The remaining 6 I/O lines are used onboard to control the LEDs (see Light Emitting Diodes (LEDs) in this chapter).

3.3 Power Supplies

The USB keyboard/hub EVM requires no external power supply for operation. The EVM receives power via the upstream USB cable. The USB 5-V source is limited by the USB specification to 500 mA max. The TPS2149 low-dropout regulator is used to generate the required 3.3-V supply from the USB 5-V supply. The power indicator LED (D1) turns on whenever power is available to the EVM (see Table 3–1).

3.4 Light Emitting Diodes (LEDs)

Several onboard LEDs are provided on the EVM for quick and easy evaluation. A set of six green LEDs (D2 – D7), connected to P3.0 through P3.5 of the TUSB2136, may be used for general purposes in any code that is written for the TUSB2136 (see Table 3–1). By default, the factory code provides the EVM with the use of only three of the LEDs as keyboard status indicators for Scroll Lock (D2), Caps Lock (D3), and Num Lock (D4). The other three are not used.

Table 3–1. LED Description

LED

Description

 

 

D2–D7

Green LED ON indicates corresponding GPIO pin is low (when D1 is ON).

 

Green LED OFF indicates corresponding GPIO pin is high (when D1 is ON).

 

 

D1

Red LED ON indicates that the EVM is powered on and not suspended.

 

Red LED OFF indicates that the EVM is powered off or suspended.

 

 

3-2

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Texas Instruments TUSB2136 manual LED Description, Led

TUSB2136 specifications

Texas Instruments (TI) is a renowned leader in semiconductor technology, and one of its notable offerings is the TUSB2136. This USB 2.0 hub controller is specifically designed to facilitate seamless connectivity in various electronic applications, making it a vital component in today’s digital ecosystem.

The TUSB2136 is based on USB technology, supporting a high-speed data transmission rate of up to 480 Mbps. One of its key features is the ability to manage multiple USB ports, specifically providing support for up to three downstream ports. This allows a single TUSB2136 chip to connect multiple devices, significantly enhancing system design flexibility and efficiency.

A significant advantage of the TUSB2136 is its low power consumption, which is crucial for battery-operated devices. The controller incorporates a low-power sleep mode that helps reduce energy consumption when the device is inactive, thus extending battery life. Additionally, it complies with USB Power Delivery specifications, allowing for efficient power management and distribution across connected devices.

The TUSB2136 is built on TI's proprietary technology, which enhances reliability and performance. It utilizes integrated supervisory and control functionality that ensures proper function and reduces the need for external circuitry. This integration leads to simplified designs and smaller footprints, which is especially beneficial in compact devices.

Another noteworthy characteristic of the TUSB2136 is its robust support for a variety of communication protocols. It is designed to handle different USB device classes seamlessly, supporting functions such as mass storage, human interface devices, and audio devices. This versatility makes it an ideal choice for a wide range of applications, from consumer electronics to industrial automation.

The device also features advanced fault detection capabilities. In the event of a short circuit or other issues, the TUSB2136 can help isolate the problem, ensuring system reliability and user safety. Its compliance with USB specifications means that designers can integrate it into their systems with confidence that it meets industry standards.

In summary, the Texas Instruments TUSB2136 USB hub controller stands out with its multi-port support, low power consumption, high data transfer rates, and reliability. It represents a significant advancement in USB connectivity technology, making it an essential component for designers looking to enhance their products with efficient and flexible USB solutions. As technology continues to evolve, the versatility and features of the TUSB2136 will undoubtedly play a crucial role in the development of future electronic devices.