General description

The ISP1181 is a Universal Serial Bus (USB) interface device which complies with Universal Serial Bus Specification Rev. 1.1. It provides full-speed USB communication capacity to microcontroller or microprocessor-based systems. The ISP1181 communicates with the system’s microcontroller or microprocessor through a high-speed general-purpose parallel interface.The fully autonomous Direct Memory Access (DMA) operation - auto download, auto repeat, auto execution - removes the need for the device to re-enable or re-initialize the DMA operation every time.

Features

■ Complies with Universal Serial Bus Specification Rev. 1.1 and most Device Class specifications

■ High performance USB interface device with integrated Serial Interface Engine (SIE), FIFO memory, transceiver and 3.3 V voltage regulator

■ Interrupt endpoint can be configured in ‘rate feedback’ mode

■ High speed (11.1 Mbyte/s or 90 ns read/write cycle) parallel interface

■ Fully autonomous and multi-configuration DMA operation

■ Up to 14 programmable USB endpoints with 2 fixed control IN/OUT endpoints

■ Integrated physical 2462 bytes of multi-configuration FIFO memory

■ Endpoints with double buffering to increase throughput and ease real-time data transfer

■ Seamless interface with most microcontrollers/microprocessors

■ Bus-powered capability with low power consumption and low ‘suspend’ current

■ 6 MHz crystal oscillator with integrated PLL for low EMI Controllable LazyClock (24 kHz) output during ‘suspend

■ Software controlled connection to the USB bus (SoftConnect?)

■ Good USB connection indicator that blinks with traffic (GoodLink?)

■ Clock output with programmable frequency (up to 48 MHz)

■ Complies with the ACPI?, OnNow? and USB power management requirements

■ Internal power-on and low-voltage reset circuit, with possibility of a software reset

■ Operation over the extended USB bus voltage range (4.0 to 5.5 V) with 5 V tolerant I/O pads

■ Operating temperature range ?40 to +85 °C

■ 8 kV in-circuit ESD protection for lower cost of external components

■ Full-scan design with high fault coverage

■ Available in a TSSOP48 package.

Applications

■ Personal digital assistant (PDA)

■ Digital camera

■ Communication device, e.g.

◆ router

◆ modem

■ Printer

■ Scanner.