EMC2302 datasheet(14/44 Pages) SMSC

14 / 44 page

Dual RPM-Based PWM Fan Controller

Datasheet

Revision 1.1 (10-12-09)

SMSC EMC2302

DATASHEET

3.2.2

Read Byte

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

3.2.3

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.

3.2.4

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.

3.2.5

Block Write Protocol

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

Table 3.6. It is an extension of the Write Byte Protocol.

Table 3.3 Read Byte Protocol

START

SLAVE

ADDRESS

ACK

Address

ACK

START

Slave

Address

ACK

Data

NACK

STOP

1 -> 0

YYYY_YYYb

XXh

0 -> 1

YYYY_YYYb

XXh

0 -> 1

Table 3.4 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

1 -> 0

YYYY_YYYb

XXh

0 -> 1

Table 3.5 Receive Byte Protocol

START

SLAVE

ADDRESS

ACK

NACK

STOP

1 -> 0

YYYY_YYYb

XXh

0 -> 1

Table 3.6 Block Write Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

DATA

ACK

1 ->0

YYYY_YYYb

XXh

DATA

ACK

DATA

ACK

. . .

DATA

ACK

STOP

XXh

. . .

XXh

0 -> 1

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