EMC2104 datasheet(19/101 Pages) SMSC

19 / 101 page

Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

4.3

Read Byte

The Read Byte protocol is used to read one byte of data from the registers as shown in Table 4.3.

4.4

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 4.4.

4.5

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 4.5.

4.6

Alert Response Address

The ALERT# output can be used as a processor interrupt or as an SMBus Alert when configured to

operate as an interrupt.

When it detects that the ALERT# pin is asserted, the host will send the Alert Response Address (ARA)

to the general address of 0001_100xb. All devices with active interrupts will respond with their client

address as shown in Table 4.6.

Table 4.3 Read Byte Protocol

START

SLAVE

ADDRESS

ACK

Address

ACK

START

Slave

Address

ACK

Data

NACK

STOP

0 -> 1

0101_111

XXh

0 -> 1

0101_111

XXh

1 -> 0

Table 4.4 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

0 -> 1

0101_111

XXh

1 -> 0

Table 4.5 Receive Byte Protocol

START

SLAVE

ADDRESS

ACK

NACK

STOP

0 -> 1

0101_111

XXh

1 -> 0

Table 4.6 Alert Response Address Protocol

START

ALERT

RESPONSE

ADDRESS

ACK

DEVICE

ADDRESS

NACK

STOP

0 -> 1

0001_100

0101_111

1 -> 0

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