CAP1128 datasheet(14/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 14

 2015 Microchip Technology Inc.

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 4-6.

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

4.4

I2C Protocols

The CAP1128 supports I2C Block Write and Block Read.

The protocols listed below use the convention in Table 4-2.

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 4-7.

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 4-8.

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.

4.5

SPI Interface

The SMBus has a predefined packet structure, the SPI does not. The SPI Bus can operate in two modes of operation,

normal 4-wire mode and bi-directional 3-wire mode. All SPI commands consist of 8-bit packets sent to a specific slave

device (identified by the CS pin).

The SPI bus will latch data on the rising edge of the clock and the clock and data both idle high.

All commands are supported via both operating modes. The supported commands are: Reset Serial interface, set

address pointer, write command and read command. Note that all other codes received during the command phase are

ignored and have no effect on the operation of the device.

TABLE 4-6:

RECEIVE BYTE PROTOCOL

Start

Slave Address

ACK

NACK

Stop

1 -> 0

YYYY_YYY

XXh

0 -> 1

TABLE 4-7:

BLOCK WRITE PROTOCOL

Start

Slave

Address

ACK

Address

ACK

1 ->0

YYYY_YYY

XXh

ACK

Data

ACK

. . .

Data

ACK

Stop

XXh

. . .

XXh

0 -> 1

TABLE 4-8:

BLOCK READ PROTOCOL

Start

Slave

Address

ACK

Address

ACK

Start

Slave

Address

ACK

Data

1->0

YYYY_YYY

XXh

1 ->0

YYYY_YYY

XXh

ACK

Data

ACK

Data

ACK

Data

ACK

. . .

Data

NACK

Stop

XXh

. . .

XXh

0 -> 1

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