CAP1106

DS00001624B-page 12

 2015 Microchip Technology Inc.

4.3.3

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 4-4.

APPLICATION NOTE: The Send Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

4.3.4

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 4-5.

APPLICATION NOTE: The Receive Byte protocol is not functional in Deep Sleep (i.e., DSLEEP bit is set).

4.4

The protocols listed below use the convention in Table 4-1.

4.4.1

BLOCK WRITE

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in Table 4-6.

APPLICATION NOTE: When using the Block Write protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

4.4.2

BLOCK READ

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 4-7.

APPLICATION NOTE: When using the Block Read protocol, the internal address pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

TABLE 4-3:

READ BYTE PROTOCOL

Start

Slave

Address

WR

ACK

Register

Address

ACK

Start

Slave

Address

RD

ACK

Register

Data

NACK

Stop

1->0

0101_000

0

0

XXh

0

1 ->0

0101_000

1

0

XXh

1

0 -> 1

TABLE 4-4:

SEND BYTE PROTOCOL

Start

Slave Address

WR

ACK

Register Address

ACK

Stop

1 -> 0

0101_000

0

0

XXh

0

0 -> 1

TABLE 4-5:

RECEIVE BYTE PROTOCOL

Start

Slave Address

RD

ACK

Register Data

NACK

Stop

1 -> 0

0101_000

1

0

XXh

1

0 -> 1

TABLE 4-6:

BLOCK WRITE PROTOCOL

Start

Slave

Address

WR

ACK

Register

Address

ACK

Register Data

ACK

1 ->0

0101_000

0

0

XXh

0

XXh

0

Register Data

ACK

Register

Data

ACK

. . .

Register

Data

ACK

Stop

XXh

0

XXh

0

. . .

XXh

0

0 -> 1