CAP1208 datasheet(17/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 17

Note 3.4

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

3.4

I2C Protocols

The CAP1208 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.

Note 3.5

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

3.4.2

Block Write

The Block Write is used to write multiple data bytes to a group of contiguous registers as shown in

Table 3.7.

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.

Table 3.5 Receive Byte Protocol

START

SLAVE

ADDRESS

ACK

NACK

STOP

1 -> 0

0101_000

(Note 3.4)

XXh

0 -> 1

Table 3.6 Block Read Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

START

SLAVE

ADDRESS

ACK

DATA

1->0

0101_000

(Note 3.5)

XXh

1 ->0

0101_000

(Note 3.5)

XXh

ACK

DATA

ACK

DATA

ACK

DATA

ACK

. . .

DATA

NACK

STOP

XXh

. . .

XXh

0 -> 1

Table 3.7 Block Write Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

1 ->0

0101_000

(Note 3.6)

XXh

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