USB2507 查看數據表（PDF） - Microchip Technology

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USB2507

Integrated USB 2.0 Compatible 7-Port Hub

Microchip Technology 

USB2507

5.2.1

I2C EEPROM

The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the Philips Semicon-

ductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C EEPROM interface is designed

to attach to a single “dedicated” I2C EEPROM, and it conforms to the Standard-mode I2C Specification (100kbit/s trans-

fer rate and 7-bit addressing) for protocol and electrical compatibility.

Note: Extensions to the I2C Specification are not supported.

The Hub acts as the master and generates the serial clock SCL, controls the bus access (determines which device acts

as the transmitter and which device acts as the receiver), and generates the START and STOP conditions.

5.2.1.1 Implementation Characteristics

Please refer to the MicroChip 24AA00 DataSheet for Protocol and Programming specifics.

5.2.1.2 Pull-Up Resistor

The Circuit board designer is required to place external pull-up resistors (10K recommended) on the SDA/SMBDATA

& SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM manufacturer guidelines) to Vcc in

order to assure proper operation.

5.2.1.3 I2C EEPROM Slave Address

Slave address is 1010000.

Note: 10-bit addressing is NOT supported.

5.2.2 IN-CIRCUIT EEPROM PROGRAMMING

The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s EEPROM interface and

allows an external source to program the EEPROM).

5.2.3 EEPROM DATA

TABLE 5-1:

Field

VID

PID

USER-DEFINED DESCRIPTOR DATA

Byte

MSB:

LSB

Size

(Bytes)

Default

CFG

Self

(Hex)

Default

CFG

Bus

(Hex)

1:0

2

0424

0424

3:2

2

2507

2507

Description

Vendor ID (assigned by USB-IF).

Product ID (assigned by Manufacturer).

DID

5:4

Config Data

6

Byte 1

Config Data

7

Byte 2

Non Removable 8

Device

Port Disable

9

Self-Powered

Port Disable

A

Bus-Powered

Max Power

B

Self-Powered

Max Power

C

Bus-Powered

2

0000

1

98

1

10

1

00

1

00

1

00

1

01

1

64

0000

1C

90

00

00

00

01

64

Device ID (assigned by Manufacturer).

Configuration data byte #1 for Hub options.

Configuration data byte #2 for Hub options.

Defines the ports that contain attached devices

(this is used only when Hub is part of a

compound device).

Selects the ports that will be permanently

disabled

Selects the ports that will be permanently

disabled

Max Current for this configuration (expressed

in 2mA units).

Max Current for this configuration (expressed

in 2mA units).

 2007 - 2016 Microchip Technology Inc.

DS000002251A-page 15

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