EMC2101-R-ACZL-TR datasheet(18/57 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

Note: The shaded columns represent data sent from the EMC2101 to the EEPROM device.

APPLICATION NOTE: It is recommended that the EEPROM that is used be an AT24C02B or equivalent device.

The EEPROM slave address must be 101_0000b. The device must support a block-read

command, 8-bit addressing, and 8-bit data formatting using a 2-wire bus. The device must

support 3.3V digital switching logic and may not pull the SMCLK and SMDATA pins above

5V. Data must be transmitted MSB first.

APPLICATION NOTE: No other SMBus Master should exist on the SMDATA and SMCLK lines. The presence of

another SMBus Master will cause errors in reading from the EEPROM.

The EEPROM should be loaded to mirror the register set of the EMC2101 with the desired

configuration set. All undefined registers in the EMC2101 register set should be loaded with 00h in the

EEPROM. Likewise, all registers that are read-only in the EMC2101 register set should be loaded with

00h in the EEPROM.

Because of the interaction between the Fan Control Look-up Table and the Fan Configuration Register,

the EEPROM Loader stores the contents of the Fan Configuration Register and updates this register

at the end of the EEPROM loading cycle. (See Section 6.16 and Section 6.22).

Table 4.7 Block Read Byte Protocol

START

SLAVE

ADDRESS

ACK

Address

ACK

START

SLAVE

ADDRESS

ACK

Data

. . .

ACK

Data (00h)

ACK

Data (01h)

ACK

Data (02h)

. . .

ACK

Data (FFh)

NACK

STOP

. . .

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