CAP1208 datasheet(16/67 Pages) MICROCHIP

16 / 67 page

8-Channel Capacitive Touch Sensor

Datasheet

DS00001570B-page 16

 2014 Microchip Technology Inc.

3.3.1

SMBus Write Byte

The Write Byte is used to write one byte of data to a specific register as shown in Table 3.2.

Note 3.1

CAP1208-1 only. For other addressing options, see Section 3.2.2.

3.3.2

SMBus Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 3.3.

Note 3.2

CAP1208-1 only. For other addressing options, see Section 3.2.2.

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).

Note 3.3

CAP1208-1 only. For other addressing options, see Section 3.2.2.

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).

Table 3.2 Write Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

STOP

1 ->0

0101_000

(Note 3.1)

XXh

0 -> 1

Table 3.3 Read Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

START

CLIENT

ADDRESS

ACK

DATA

NACK

STOP

1->0

0101_000

(Note 3.2)

XXh

1 ->0

0101_000

(Note 3.2)

XXh

0 -> 1

Table 3.4 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

0101_000

(Note 3.3)

XXh

0 -> 1

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