EMC2101-R-ACZL-TR datasheet(33/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

SMSC EMC2101

Revision 2.54 (06-16-09)

DATASHEET

6.3

Temperature Data Registers

As shown in Table 6.2, the internal temperature monitor is stored as an 8-bit value while the external

temperature is stored as an 11-bit value.

Please note that the internal temperature monitor is limited to the operating temperature limits of the

part resulting in a guaranteed range of 0ºC to 85ºC.

6.4

Status Register

The Status Register is a read only register and returns the operational status of the part.

If the ALERT / TACH pin is configured as an ALERT output and any of these bits are set to '1' (except

the BUSY bit and the FAULT bit), then the ALERT / TACH pin is asserted low (if interrupts are not

masked (see Section 6.5).

Reading from the Status Register will cause the MASK bit to be set if any bit (other than BUSY and

FAULT) have been set. Each bit is automatically cleared when the error condition has been removed,

however the internal error condition flags may still be set. The ARA command must be used to clear

the ALERT / TACH pin if there are no bits set in the Status Register. In addition, reading from the

Status Register will clear all bits. If the error condition persists, then the bits will be reset at the end of

the next conversion.

When the device is configured in Comparison Mode (see Section 6.23), reading the Status Register

will not clear any active status bits (except EEPROM and FAULT). These bits are automatically cleared

when the error condition is removed.

Bit 7 - Busy - indicates that the ADC is converting - does not trigger an interrupt.

Bit 6 - INT_HIGH - Internal temperature has met or exceeded the high limit.

Bit 5 - EEPROM - Indicates that the EEPROM could not be found when the device powers up in the

Auto-Program Mode (see Section 5.1). This bit only applies to the EMC2102-R. It will always read ‘0’

for the EMC2101 device.

Bit 4 - EXT_HIGH - External Diode temperature has exceeded the high limit.

Table 6.2 Temperature Data Registers

ADDR.

R/W

DEFAULT

00h

Internal

Temperature

Sign

00h

01h

External Diode

Temperature

High Byte

Sign

00h

10h

External Diode

Temperature

Low Byte

0.5

0.25

0.125

00h

Table 6.3 Status Register

ADDR

R/W

DEFAULT

02h

Status

BUSY

INT_

HIGH

EEPROM

EXT_

HIGH

EXT_

LOW

FAULT

TCRIT

TACH

00h

EMC2101-R-ACZL-TR 데이터시트(PDF) 33 Page - SMSC Corporation

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