CAP1298 datasheet(13/68 Pages) MICROCHIP

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 2013-2015 Microchip Technology Inc.

DS00001571B-page 13

CAP1298

3.3.3

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 3-4.

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

3.3.4

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 3-5.

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

3.4

I2C Protocols

The CAP1298 supports I2C Block Read and Block Write.

The protocols listed below use the convention in Table 3-1.

3.4.1

BLOCK READ

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in Table 3-6.

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 3-3:

READ BYTE PROTOCOL

Start

Slave Address

ACK

Address

ACK

Start

Client Address

ACK

Data

NACK

Stop

1->0

0101_000

XXh

1 ->0

0101_000

XXh

0 -> 1

TABLE 3-4:

SEND BYTE PROTOCOL

Start

Slave Address

ACK

Stop

1 -> 0

0101_000

XXh

0 -> 1

TABLE 3-5:

RECEIVE BYTE PROTOCOL

Start

Slave Address

ACK

NACK

Stop

1 -> 0

0101_000

XXh

0 -> 1

TABLE 3-6:

BLOCK READ PROTOCOL

Start

Slave

Address

ACK

Address

ACK

Start

Slave Address

ACK

1->0

0101_000

XXh

1 ->0

0101_000

XXh

ACK

DATA

ACK

DATA

ACK

DATA

ACK

. . .

DATA

NACK

STOP

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