CAP1214 datasheet(21/107 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

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.

4.2.6

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 4.7.

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

Table 4.6 Send Byte Protocol

START

CLIENT

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

0101_000

XXh

0 -> 1

Table 4.7 Receive Byte Protocol

START

CLIENT

ADDRESS

ACK

NACK

STOP

1 -> 0

0101_000

XXh

0 -> 1

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