CAP1114 datasheet(20/102 Pages) MICROCHIP

20 / 102 page

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

4.2.2

Block Write

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

Table 4.3. It is an extension of the Write Byte Protocol.

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.

4.2.3

SMBus Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.4.

4.2.4

Block Read

The Block Read is used to read multiple data bytes from a group of contiguous registers as shown in

Table 4.5. It is an extension of the Read Byte Protocol.

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.

4.2.5

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 4.6.

Table 4.3 Block Write Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

1 ->0

0101_000

XXh

DATA

ACK

DATA

ACK

. . .

DATA

ACK

STOP

XXh

. . .

XXh

0 -> 1

Table 4.4 Read Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

START

CLIENT

ADDRESS

ACK

DATA

NACK

STOP

1->0

0101_000

XXh

1 ->0

0101_000

XXh

0 -> 1

Table 4.5 Block Read Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

START

CLIENT

ADDRESS

ACK

DATA

1->0

0101_000

XXh

1 ->0

0101_000

XXh

ACK

DATA

ACK

DATA

ACK

DATA

ACK

. . .

DATA

NACK

STOP

XXh

. . .

XXh

0 -> 1

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