USB5534B datasheet(32/73 Pages) MICROCHIP

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USB5534B

DS00001681C-page 32

 2012 - 2015 Microchip Technology Inc.

5.5.4.1

Special Command Example

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

connected to:

First write data to the memory of the hub

After the data is written, execute the Configuration Register Access command

Finally, 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 5-4:

EXAMPLE SMBUS WRITE COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

00h

Memory address 0000h.

00h

Memory address 0000h.

03h

Number of bytes to write to memory.

80h

Get Port Device Status.

00h

Reading one data bytes.

1Fh

Read all ports.

TABLE 5-5:

CONFIGURATION REGISTER ACCESS COMMAND

Byte

Value

Comment

5Ah

Address plus write bit.

99h

Command 993Eh.

3Eh

Command 993Eh.

00h

Command Completion.

TABLE 5-6:

EXAMPLE SMBUS READ COMMAND

Byte

Value

Comments

5Ah

Address plus Write bit.

00h

Memory Address 0004h.

03h

Memory Address 0004h.

59h

Address plus Read bit.

80h

Device sends 128 bytes of data.

03h

Upstream Connection Status. (SS and HS)

02h

Port 1 Connection Status. (HS/FS/LS Only)

01h

Port 2 Connection Status. (SS Only)

02h

Port 3 Connection Status.(HS/FS/LS Only)

02h

Port 4 Connection Status.(HS/FS/LS Only)

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