USB5534B datasheet(38/73 Pages) MICROCHIP

38 / 73 page

USB5534B

DS00001681C-page 38

 2012 - 2015 Microchip Technology Inc.

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.

Execute the Configuration Register Access command.

Read back data starting at memory offset 04h, which is where the Data byte starts.

Although the device can send out 128 bytes of memory data, it isn’t necessary to read the entire set, the SMBus Master

can send a stop at any time.

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.

TABLE 5-17:

CONFIGURATION REGISTER ACCESS COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

99h

Command 9937h.

37h

Command 9937h.

00h

Command Completion.

TABLE 5-18:

EXAMPLE SMBUS READ COMMAND

Byte

Value

Comments

5Ah

Address plus Write bit.

00h

Memory Address 0004h.

04h

Memory Address 0004h.

59h

Address plus Read bit.

80h

Device sends 128 bytes of data.

56h

Charging Downstream Port Detected.

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