emc2103-3-kp-tr Standard Microsystems Corp., emc2103-3-kp-tr Datasheet - Page 18

• Manufacturer Part Number: emc2103-3-kp-tr
• Description: Emc2103 Rpm-based Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

START
0 -> 1
Revision 0.88 (06-30-08)
4.3
4.4
4.5
4.6
ADDRESS
0101_110
SLAVE
START
START
START
0 -> 1
0 -> 1
0 -> 1
The Read Byte protocol is used to read one byte of data from the registers as shown in
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
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
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_100b. All devices with active interrupts will respond with their client
address as shown in
Read Byte
Send Byte
Receive Byte
Alert Response Address
WR
0
RESPONSE
ADDRESS
ADDRESS
0101_110
0101_110
ADDRESS
0001_100
SLAVE
SLAVE
ALERT
ACK
0
REGISTER
ADDRESS
Table 4.6 Alert Response Address Protocol
Table
XXh
Table 4.5 Receive Byte Protocol
WR
4.6.
RD
Table 4.3 Read Byte Protocol
Table 4.4 Send Byte Protocol
0
1
RD
1
ACK
Table
DATASHEET
0
4.5.
ACK
ACK
START
0 -> 1
ACK
18
0
0
0
ADDRESS
0101_110
REGISTER DATA
RPM-Based Fan Controller with HW Thermal Shutdown
SLAVE
REGISTER
ADDRESS
0101_1100
ADDRESS
DEVICE
XXh
XXh
RD
1
ACK
0
Table
NACK
NACK
ACK
1
1
1
REGISTER
4.4.
DATA
XXh
SMSC EMC2103
Table
STOP
1 -> 0
STOP
1 -> 0
STOP
1 -> 0
Datasheet
4.3.
NACK
1
STOP
1 -> 0