EMC2101-R-ACZL-TR datasheet(16/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

Revision 2.54 (06-16-09)

SMSC EMC2101

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 / TACH 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 / TACH pin is asserted, the host will send the Alert Response Address

(ARA) to the general address of 000_1100b. 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

Table 4.4 Send Byte Protocol

START

SLAVE

ADDRESS

ACK

ADDRESS

ACK

STOP

181

Table 4.5 Receive Byte Protocol

START

SLAVE

ADDRESS

ACK

NACK

STOP

181

Table 4.6 Alert Response Address Protocol

START

ALERT

RESPONSE

ADDRESS

ACK

DEVICE

ADDRESS

NACK

STOP

181

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