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The TUSB3410 provides bridging between a USB port and an enhanced UART serial port. The TUSB3410 contains all the necessary logic to communicate with the host computer using the USB bus. It contains an 8052 microcontroller unit (MCU) with 16K bytes of RAM that can be loaded from the host or from external on-board memory via an I2C bus. It also contains 10K bytes of ROM that allow the MCU to configure the USB port at boot time. The ROM codealso contains an I2C boot loader. All the device functions such as the USB command decoding, UART setup, and error reporting are managed by the internal MCU firmware under the auspices of the PC host.
The TUSB3410 can be used to build an interface between a legacy serial peripheral device and a PC with USB ports, such as a legacy-free PC. Once configured, data flows from the host to the TUSB3410 via USB OUT commands andthen out from the TUSB3410 on the SOUT line. Conversely, data flows into the TUSB3410 on the SIN line and theninto the host via USB IN commands.
TUSB3410 Maximum Ratings
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 3.6 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Output voltage, VO . . . . . . . . . . . . . . . . . . . . . 0.5 V to VCC + 0.5 V Input clamp current, IIK . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA Output clamp current, IOK . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA † Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability
TUSB3410 Features
• Fully compliant with USB 2.0 full speed Specifications • Supports 12-Mbps USB data rate (full speed) • Supports USB suspend, resume, and remote wakeup operations • Supports two power source modes: Bus-powered mode Self-powered mode • Can support a total of 3-input and 3-output (interrupt, bulk) endpoints • Integrated 8052 microcontroller with 256 * 8 RAM for internal data 10K * 8 ROM (with USB and I2C boot loader) 16K * 8 RAM for code space loadable from host or I2C port 2K * 8 Shared RAM used for data buffers and endpoint descriptor blocks (EDB) Four GPIO pins from 8052 port 3 Master I2C controller for EEPROM device access MCU operates at 24 MHz providing 2 MIPS operation 128-ms Watchdog Timer • Built-in two-channel DMA controller for USB/UART bulk I/O • Operates from a 12-MHz crystal • Supports USB suspend and resume • Supports remote wake-up • Available in 32-pin LQFP • 3.3-V operation with 1.8-V core operating voltage provided by on-chip 1.8-V voltage regulator • Software/hardware flow control: Programmable Xon/Xoff characters Programmable Auto-RTS/DTR and Auto-CTS/DSR • Automatic RS485-bus transceiver control, with and without echo • Selectable IrDA mode for up to 115.2 kbps transfer • Software selectable baud rate from 50 to 921.6 k baud • Programmable serial-interface characteristics 5-, 6-, 7-, or 8-Bit characters Even, odd, or no parity-bit eneration and detection 1-, 1.5-, or 2-Stop bit generation • Line break generation and detection 22 • Internal test and loop-back capabilities • Modem-control functions (CTS, RTS, DSR,DTR, RI, and DCD) • Internal diagnostics capability Loopback control for communications link-fault isolation Break, parity, overrun, framing-error simulation