General description

The ISP1130 integrates a Universal Serial Bus (USB) hub with a keyboard controller into a single chip, which complies with Universal Serial Bus Specification Rev. 1.1 and the USB Device Class Definition for Human Interface Devices (HID). The hub has 1 to 2 downstream ports and 1 to 3 non-removable embedded functions, one of which is dedicated to the keyboard operation. The hub controller is fully implemented in hardware, ensuring a fast response to host requests.

Features

■ Compound USB hub device with integrated hub repeater, hub controller, Serial Interface Engine (SIE), data transceivers and 5 V to 3.3 V voltage regulator

■ Complies with Universal Serial Bus Specification Rev. 1.1 and Device Class Definition for Human Interface Devices (HID)

■ Complies with ACPI, OnNow and USB power management requirements

■ Supports bus-powered and hybrid-powered application

■ 1 to 2 downstream ports with automatic speed detection

■ 1 to 3 non-removable embedded functions, 1 dedicated for keyboard operation

■ 8 × 18 scan line matrix for HID compliant keyboard applications

■ Integrated 80C51 microcontroller core with 8 kbytes mask ROM and 256 bytes data RAM

■ On-chip watchdog timer for automatic fault recovery

■ Internal power-on reset and low-voltage reset circuit

■ Individual power switching for downstream ports

■ Individual port overcurrent protection with built-in sense circuits

■ 6 MHz crystal oscillator with on-chip PLL for low EMI

■ Reduced power consumption by putting microcontroller in sleep mode or power-down mode

■ Visual USB traffic monitoring (GoodLink) for hub and downstream ports

■ I2C-bus interface to read vendor ID, product ID and configuration bits from external EEPROM

■ Operation over the extended USB bus voltage range (4.0 to 5.5 V)

■ Operating temperature range −40 to +85 °C

■ Available in 56-pin SDIP and SSOP packages.