USB5532B datasheet(37/68 Pages) MICROCHIP

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USB5532B

DS00001679C-page 37

 2012 - 2015 Microchip Technology Inc.

5.6.1.1

Configuration Register Write Example

The following example shows how the SMBus messages will be formatted to set the VID of the hub to a custom value,

AA55h.

Write data to the memory of the hub:

Execute the Configuration Register Access command:

5.6.1.2

Configuration Register Read Example

The following example shows how to read the Charger Detection register to find out what type of charger the hub has

connected to:

Write data to the memory of the hub.

TABLE 5-14:

EXAMPLE SMBUS WRITE COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

00h

Memory address 0000h.

00h

Memory address 0000h.

06h

Number of bytes to write to memory.

00h

Write Configuration Register.

02h

Writing two data bytes.

30h

VID is in register 3000h.

00h

VID is in register 3000h.

55h

LSB of Vendor ID AA55h.

AAh

MSB of Vendor ID AA55h.

TABLE 5-15:

CONFIGURATION REGISTER ACCESS COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

99h

Command 9937h.

37h

Command 9937h.

00h

Command Completion.

TABLE 5-16:

EXAMPLE SMBUS WRITE COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

00h

Memory address 0000h.

00h

Memory address 0000h.

04h

Number of bytes to write to memory.

01h

Read Configuration Register.

01h

Reading one data bytes.

30h

BC Detect is in register 30E2h.

E2h

BC Detect is in register 30E2h.

USB5532B Datasheet(PDF) 37 Page - Microchip Technology

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