500mA Low Quiescent Current Integrated Circuit Chip High PSRR Low Dropout Linear Regulator TUSB3410

500mA, Low Quiescent Current, Ultra-Low Noise, High PSRR Low Dropout Linear Regulator

 Main Features

2.1 USB 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

2.2 General Features

• 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 2.3 Enhanced UART Features

• 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 generation and detection

– 1-, 1.5-, or 2-Stop bit generation

• Line break generation and detection

• 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

Pullup Resistor Connect/Disconnect

The TUSB3410 enumeration can be activated by the MCU (there is no need to disconnect the cable physically). Figure 5–2 represents the implementation of the TUSB3410 connect and disconnect from a USB up-stream port. When CONT = 1 in the USBCTL register, the CMOS driver sources VDD to the pullup resistor (PUR pin) presenting a normal connect condition to the USB hub (high speed). When CONT = 0, the PUR pin is driven low. In this state, the 1.5-kΩ resistor is connected to GND, resulting in the device disconnection state. The PUR driver is a CMOS driver that can provide (VDD – 0.1 V) minimum at 8-mA source current.