I 2 c-bus interface, Philips semiconductors, C-bus interface – Philips UM10011 User Manual

Page 10

Philips Semiconductors

UM10011_4

ISP1521 Hi-Speed USB Hub Demo Board

User manual

Rev. 04.00 — 17 June 2004

10 of 20

Figure 5-2: Windows Reporting of the Self-Powered Mode

5.8. I

C-Bus Interface

The ISP1521 can use either its USB descriptors from the internal ROM, or from an external I

C-

Bus

EEPROM or microcontroller. Mode selection is done through jumpers J11and J12 (see

Table 5-3).

Table 5-3: Mode Selection Using J11 and J12

*—Default settings.

An external I

C-Bus controller acting as a master can also be used to update hub descriptors

through the CN1 connector.

Note: The I

C-Bus external EEPROM cannot be programmed on-board.

J11

J12

Mode

SCL

SDA

ON ON

Internal

ROM LOW LOW

OFF OFF

C-Bus EEPROM*

HIGH