EMC6D102-CZC-TR(2006) Ver la hoja de datos (PDF) - SMSC -> Microchip

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EMC6D102-CZC-TR
(Rev.:2006)

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

SMSC -> Microchip 

Fan Control Device with Hardware Monitoring and Acoustic Noise Reduction Features

Datasheet

Write Byte

The Write Byte protocol is used to write data to the registers. The data will only be written if the protocol

shown in Table 4.2 is performed correctly. Only one byte is transferred at time for a Write Byte protocol.

Table 4.2 SMBus Write Byte Protocol

FIELD START SLAVE ADDR WR ACK REG. ADDR ACK REG. DATA ACK STOP

Bits

1

7

1

1

8

1

8

1

1

Read Byte

The Read Byte protocol is used to read data from the registers. The data will only be read if the

protocol shown in Table 4.3 is performed correctly. Only one byte is transferred at time for a Read Byte

protocol.

Table 4.3 SMBus Read Byte Protocol

FIELD:

SLAVE

REG.

SLAVE

START ADDR WR ACK ADDR ACK START ADDR RD ACK

REG.

DATA

NACK STOP

Bits:

1

7

1

1

8

1

1

7

1

1

8

1

1

4.4

4.4.1

4.5

Invalid Protocol Response Behavior

Registers that are accessed with an invalid protocol will not be updated. A register will only be updated

following a valid protocol. The only valid protocols are the Write Byte and Read Byte protocols, which

are described above.

The EMC6D102 device responds to three SMBus slave addresses:

1. The SMBus slave address that supports the valid protocols defined in the previous sections is

determined by the level on the Address Select and Address Enable pins as shown in Section 4.1,

"Slave Address," on page 13.

2. SMBus Alert Response (0001 100). The SMBus will only respond to the SMBus Alert Response

Address if the SMBus Alert Response interrupt was generated to request a response from the Host.

The SMBus Alert Response is defined in Section 4.10, "SMBus Alert Response Address," on

page 16.

Attempting to communicate with the Hardware Monitor Block over SMBus with an invalid slave

address, or invalid protocol will result in no response, and the SMBus Slave Interface will return to the

idle state.

The only valid registers that are accessible by the SMBus slave address are the registers defined in

the Registers Section. See Section 4.4.1, "Undefined Registers" for response to undefined registers.

Undefined Registers

Reads to undefined registers return 00h. Writes to undefined registers have no effect and return no

error.

General Call Address Response

The EMC6D102 will not respond to a general call address of 0000_000.

SMSC EMC6D102

15

DATASHEET

Revision 0.4 (06-15-06)

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