USB2517 datasheet(38/58 Pages) MICROCHIP

38 / 58 page

USB2517/USB2517I

DS00001598B-page 38

 2013-2016 Microchip Technology Inc.

7.2.1.34

7.2.2

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 conforms to the Standard-mode I2C Specification (100kbit/s transfer

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

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.

7.2.2.1

Implementation Characteristics

The Hub will only access an EEPROM using the Sequential Read Protocol.

7.2.2.2

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.

7.2.2.3

I2C EEPROM Slave Address

Slave address is 1010000.

7.2.3

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).

Bit

Number

Bit Name

Description

7:3

Reserved

INTF_PW_DN

SMBus Interface Power Down

‘0’ = Interface is active

‘1’ = Interface power down after ACK has completed

RESET

Reset the SMBus Interface and internal memory back to RESET_N assertion

default settings.

‘0’ = Normal Run/Idle State

‘1’ = Force a reset of registers to their default state

USB_ATTACH

USB Attach (and write protect)

‘0’ = SMBus slave interface is active

‘1’ = Hub will signal a USB attach event to an upstream device. The internal

memory (address range 00h-FEh) is “write-protected” to prevent uninten-

tional data corruption.

Note:

Extensions to the I2C Specification are not supported.

Note:

10-bit addressing is NOT supported.

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