UCS1002-2 datasheet(31/114 Pages) MICROCHIP

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Programmable USB Port Power Controller with Charger Emulation

Datasheet

SMSC UCS1002

Revision 1.4 (07-16-13)

DATASHEET

4.2.3.1

SMBus Write Byte

The Write Byte is used to write one byte of data to a specific register as shown in Table 4.4.

4.2.3.2

SMBus Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.5.

4.2.3.3

SMBus Send Byte

The Send Byte protocol is used to set the internal address register pointer to the correct address

location. No data is transferred during the Send Byte protocol as shown in Table 4.6.

4.2.3.4

SMBus Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register address

pointer is known to be at the right location (e.g., set via Send Byte). This is used for consecutive reads

of the same register as shown in Table 4.7.

4.2.4

I2C Protocols

The UCS1002 supports I2C Block Read and Block Write. The protocols listed below use the convention

in Table 4.3.

Table 4.4 Write Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

STOP

1 ->0

YYYY_YYY

XXh

0 -> 1

Table 4.5 Read Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

START

CLIENT

ADDRESS

ACK

DATA

NACK

STOP

1->0

YYYY_YYY

XXh

1 ->0

YYYY_YYY

XXh

0 -> 1

Table 4.6 Send Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

YYYY_YYY

XXh

0 -> 1

Table 4.7 Receive Byte Protocol

START

CLIENT

ADDRESS

ACK

NACK

STOP

1 -> 0

YYYY_YYY

XXh

0 -> 1

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