EMC6D103S datasheet(52/84 Pages) SMSC

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Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features

Datasheet

Revision 0.2 (06-14-06)

SMSC EMC6D103S

DATASHEET

The Temperature Reading registers reflect the current temperatures of the internal and remote diodes.

Remote Diode 1 Temp Reading register reports the temperature measured by the Remote1- and

Remote1+ pins, Remote Diode 2 Temp Reading register reports the temperature measured by the

Remote2- and Remote2+ pins, and the Internal Temp Reading register reports the temperature

measured by the internal (ambient) temperature sensor. Current temperatures are represented as 8

bit, 2’s complement, signed numbers in Celsius, as shown below in Table 8.5. The Temperature

Reading register will return a value of 80h if the remote diode pins are not implemented by the board

designer or are not functioning properly (this corresponds to the diode fault interrupt status bits). The

Temperature Reading registers will be updated automatically by the EMC6D103S Chip with a minimum

frequency of 4Hz.

Note: These registers are read only – a write to these registers has no effect.

Each of the temperature reading registers are mapped to a zone. Each PWM may be programmed to

operate in the auto fan control operating mode by associating a PWM with one or more zones. The

following is a list of the zone associations.

Zone 1 is controlled by Remote Diode 1 Temp Reading

Zone 2 is controlled by Internal Temp Reading (Ambient Temperature Sensor)

Zone 3 is controlled by Remote Diode 2 Temp Reading

8.2.3

Registers 28-2Fh: Fan Tachometer Reading

Table 8.5 Temperature vs. Register Reading

TEMPERATURE

READING (DEC)

READING (HEX)

-127

°c

-127

81h

-50

°c

-50

CEh

°c

00h

°c

32h

127

°c

127

7Fh

(SENSOR ERROR)

80h

Table 8.6 Registers 28-2Fh: Fan Tachometer Reading

Address

Read/

Write

Bit 7

(MSb)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSb)

Default

Value

28h

Tach1 LSB

N/A

29h

Tach1 MSB

N/A

2Ah

Tach2 LSB

N/A

2Bh

Tach2 MSB

N/A

2Ch

Tach3 LSB

N/A

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