EMC6D103 datasheet(30/92 Pages) SMSC

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

Datasheet

Revision 0.3 (03-01-07)

SMSC EMC6D103

DATASHEET

There are Remote Diode (1 or 2) Fault status bits in Interrupt Status Register 2 (42h), which, when

one, indicate a short or open-circuit on remote thermal diode inputs (Remote x+ and Remote x-).

Before a remote diode conversion is updated, the status of the remote diode is checked. In the case

of a short or open-circuit on the remote thermal diode inputs, the value in the corresponding reading

status bit to be set (i.e. Remote Diode x Limit Error bits (D1 and D2) are located in the Interrupt Status

1 Register at register address 41h).

The temperature change is computed by measuring the change in Vbe at two different operating points

of the diode to which the Remote x+ and Remote x- pins are connected. But accuracy of the

measurement also depends on non-ideality factor of the process the diode is manufactured on.

6.9.3

Temperature Data Format

Temperature data can be read from the three temperature registers:

Internal Temp Reading register (26h)

Remote Diode 1 Temp Reading register (25h)

Remote Diode 2 Temp Reading register (27h)

The following table shows several examples of the format of the temperature digital data, represented

by an 8-bit, two’s complement word with an LSB equal to 1.0 0C.

Table 6.6 Temperature Data Format

TEMPERATURE

READING (DEC)

READING (HEX)

DIGITAL OUTPUT

-1270C

-127

81h

1000 0001

-50 0C

-50

CEh

1100 1110

-25 0C

-25

E7h

1110 0111

-1 0C

-1

FFh

1111 1111

0 0C

00h

0000 0000

+1 0C

01h

0000 0001

+25 0C

19h

0001 1001

+500C

32h

0011 0010

+1270C

127

7Fh

0111 1111

SENSOR ERROR

128

80h

1000 0000

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