ISP1521BEUM ST-Ericsson Inc, ISP1521BEUM Datasheet - Page 17

• Manufacturer Part Number: ISP1521BEUM
• Description: IC USB HUB CONTROLLER HS 80-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1521BEUM

• Controller Type: USB Hub
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: 568-1884-2; ISP1521BE,518; ISP1521BE-T

CD00222695
Product data sheet
8.2.2 Architecture of configurable hub descriptors
Configurable hub descriptors can be masked in the internal ROM memory; see
These descriptors can also be supplied from an external EEPROM or a microcontroller.
The ISP1521 implements both the master and slave I
from the external EEPROM or the microcontroller is transferred into the internal RAM
during the power-on reset. A signature word is used to identify correct descriptors. If the
signature matches, the content of the RAM is chosen instead of the ROM.
When external microcontroller mode is selected and while the external microcontroller is
writing to the internal RAM, any request to configurable descriptors will be responded to
with a Not AcKnowledge (NAK). There is no specified time-out period for the NAK signal.
This data is then passed to the host during the enumeration process.
The three configuration methods are selected by connecting pins SCL and SDA in the
manner given in
Table 11.
Configuration method
Internal ROM
External EEPROM
External microcontroller
Fig 7.
The I
Configurable hub descriptors
Configuration method
2
C-bus cannot be shared between the EEPROM and the external microcontroller.
HUB CORE
Table
Rev. 07 — 4 February 2010
11.
SCL
ground
2.2 kΩ-to-4.7 kΩ pull-up
driven LOW by the
microcontroller during reset
DESCRIPTOR
GENERATOR
INTERFACE
MICROCONTROLLER
MUX
signature
2
match
C-bus controllers. The information
Hi-Speed USB hub controller
SDA
ground
2.2 kΩ-to-4.7 kΩ pull-up
2.2 kΩ-to-4.7 kΩ pull-up
I
2
SERIAL EEPROM
C-BUS INTERFACE
MASTER/SLAVE
(256 bytes)
(256 bytes)
RAM
ROM
© ST-ERICSSON 2010. All rights reserved.
I
2
ISP1521
C-bus
mld711
Figure
17 of 53
7.