InsideShowcase (Volume 25) is available in HTML and PDF format. - 191KBProgrammable dual DACs let designers trade power for speed New evaluation modules provide low cost, easy-to-use design platforms PCI2031: ACPI/PCI power management compliant PCI-to PCI bridge New options available on several UART devices TUSB2140: 4-port USB with I2C TI, the USB "system solution" provider Fully compliant IrDA 1.1 solution 2.5-V Power managment for DSP systems A Cardbus system solution ideal for multimedia applications Wide input bandwidth 8-bit, 40-MSPS ADC CD now stands for changing DATA
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TUSB2140: 4-port USB with I2CProduct Features
Universal Serial Bus (USB) is a data transmission and power distribution interface that has been introduced into the computer and computer peripheral markets to upgrade the slower serial and parallel interfaces. This four-wire, 12 Mbps, hot-plugable interface, distributes 5-V power as well as data, has been widely adapted by the PC industry.
The TUSB2140 is a compound USB device that provides a 4-port hub and an embedded function. The TUSB2140 is fully compatible with the USB specification (version 1.0) while the embedded function is fully compatible with the USB display-device class specification. The embedded function includes a control endpoint and an interrupt endpoint to support USB data transfers. The FIFOs and control registers associated with the endpoints are fully integrated within the device. An Inter IC (I2C), 2-wire serial interface is provided for a local micro-controller unit to access the FIFOs and control registers. This device can be used with any microcontroller with an I2C interface. The TUSB2140 contains state machine functionality to respond to USB requests providing both quick response time and minimize software overhead in the attached microcontroller. USB compatible transceivers are provided for all upstream and downstream ports. All external downstream ports support both full and low-speed connection by automatically setting the slew rate according to the speed of the device attached to the port. To reduce power consumption, the TUSB2140 supports a ganged mode as well as a per port mode for power switching and overcurrent conditions. Additionally, all downstream ports support full-speed and low-speed operations. The TUSB2140 supports two power modes, a self-powered and a bus-powered mode. The low-power, 3.3-V CMOS device is a drop-in solution that incorporates all of the circuitry necessary to interface to a PC with USB capability. Other devices in this family include the previously released TUSB2040 4-port hub and TUSB2070 7-port hub. The TUSB2140 is available in a 40-pin DIP (N) package or a 64-pin TQFP (PT) package.
Vol 25 January, 1998 |
