|
|
Information as of 2000-01-10
 Latest information online
ISP1130; USB hub
| Description |  |
|
The ISP1130 integrates a Universal Serial Bus (USB) hub with a keyboard controller into a single chip, which complies with USB Specification Rev. 1.1, the USB Device Class Definition for Human Interface Devices (HID). The hub has 2 downstream ports and 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. The integrated 5 V to 3.3 V regulator allows direct connection to the USB power supply VBUS . The 2 downstream ports are bus-powered and can interface low-power USB devices such as a joystick or a mouse. ISP1130 uses SoftConnectTM technology to connect to the USB host upon detection of VBUS . The low power consumption in ‘suspend’ mode allows easy design of equipment that is compliant with the ACPITM, OnNowTM and USB power management requirements. The integrated keyboard controller is based on the 80C51 family and has 8 kbytes of mask ROM and 256 bytes of data RAM. The code memory is protected against reading by an external device. A built-in watchdog timer resets the device in case of a microcontroller hang-up. In sleep mode the clock frequency of the microcontroller is lowered from 12 MHz to 24 kHz (LazyClockTM) to reduce power consumption. A serial I2C-bus interface is provided for optional access to an external EEPROM. This allows the user to program the vendor ID, product ID, or activate the built-in keyboard matrix. The ISP1130 has built-in overcurrent sense inputs, supporting individuall overcurrent protection for downstream ports. All ports (including the hub) have GoodLinkTM indicator outputs for easy visual monitoring of USB traffic. The ISP1130 has a reduced frequency (6 MHz) crystal oscillator to minimize Electro Magnetic Interference (EMI). These features allow significant cost savings in system design and easy implementation of advanced USB functionality into PC peripherals.
| Features | |
|
- Interface Engine (SIE), data transceivers and 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
- 2 bus-powered downstream ports with automatic speed detection
- 3 non-removable embedded functions, 1 dedicated for keyboard operation
- 8 x 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 applying 24 kHz LazyClock to microcontroller in sleep 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.
| Datasheet | |
| Find similar products: | |
ISP1130 links to the similar products page containing an overview of products that are similar in function or related to the part number(s) as listed on this page. The similar products page includes products from the same catalog tree(s) , relevant selection guides and products from the same functional category.
|
