CAP1214 datasheet(20/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

4.2.1

SMBus Write Byte

The Write Byte is used to write one byte of data to a specific register as shown in Table 4.2.

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.

Table 4.2 Write Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

STOP

1 ->0

0101_000

XXh

0 -> 1

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

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