ISP1520BD ST-Ericsson Inc, ISP1520BD Datasheet - Page 10

• Manufacturer Part Number: ISP1520BD
• Description: IC, CONTROLLER, USB HUB, 64-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1520BD

• Usb Type: USB Peripheral Controller
• Usb Version: 2.0
• Data Rate: 480Mbps
• No. Of Ports: 5
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Digital Ic Case Style: QFP
• No. Of Pins: 64
• Package / Case: LQFP
• Applications: USB Hub/Microcontroller
• Interface: I²C
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-1168; ISP1520BD,557

Philips Semiconductors
ISP1520_4
Product data sheet
7.2.5 Hub repeater
7.2.6 Hub and port controllers
7.2.7 Bit clock recovery
7.3 Phase-locked loop clock multiplier
7.4 I
7.5 Overcurrent detection circuit
7.6 GoodLink
7.7 Power-on reset
A hub repeater manages connectivity on a per packet basis. It implements packet
signaling connectivity and resume connectivity. There are two repeaters in the ISP1520: a
Hi-Speed USB repeater and an Original USB repeater. The only major difference between
these two repeaters is the speed at which they operate. When the hub is connected to an
Original USB system, it automatically switches itself to function as an Original USB hub.
The hub controller provides status report. The port controller provides control for
individual downstream facing ports; it controls the port routing module. Any port status
change will be reported to the host using the hub status change (interrupt) endpoint.
The bit clock recovery circuit extracts the clock from the incoming USB data stream.
A 12 MHz-to-480 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip.
This allows the use of low-cost 12 MHz crystals. The low crystal frequency also minimizes
EMI. No external components are required for the operation of the PLL.
A simple serial I
descriptor from an external I
protocol is implemented according to the timing requirements as mentioned in I
standard specifications. The maximum data count during I
ISP1520 is 256 B.
An overcurrent detection circuit is integrated on-chip. The main features of this circuit are:
self reporting, automatic resetting, low-trip time and low cost. This circuit offers an easy
solution at no extra hardware cost on the board.
Indication of a good USB connection is provided through the GoodLink technology. An
LED can be directly connected to pin HUBGL_N through an external 330 Ω resistor.
During enumeration, the LED momentarily blinks on. After successful configuration, the
LED blinks off for 100 ms upon each transaction.
This feature provides a user-friendly indication of the status of the hub, the connected
downstream devices, and the USB traffic. It is a useful diagnostics tool to isolate faulty
USB equipment, and helps to reduce field support and hotline costs.
The ISP1520 has an internal Power-On Reset (POR) circuit.
2
C-bus controller
2
C-bus interface is provided to transfer vendor ID, product ID and string
Rev. 04 — 28 April 2006
2
C-bus EEPROM or microcontroller. A master/slave I
2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
C-bus transfers for the
ISP1520
2
C-bus
2
C-bus
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