1.5°C SMBus Temperature Sensor in Miniature SOT-23

Datasheet

SMSC EMC1001

13

Revision 1.6 (01-29-07)

DATASHEET

Note 4.3

Revision number may change. Please obtain the latest version of this document from the

SMSC web site.

At device power-up, the default values are stored in all registers. A power-on-reset is initiated when

registers will return 00h and writes to undefined registers will be ignored.

The EMC1001 uses an interlock mechanism that locks the low byte value when the high byte register

is read. This prevents updates to the low byte register between high byte and low byte reads. This

interlock mechanism requires that the high byte register always be read prior to reading the low byte

register.

4.7

Status Register

The status register is a read only register that stores the operational status of the part. When either

TLOW or THIGH are set (TA

See Section 4.3 on page 11 for more details on the ALERT

function.

Bit 7 indicates that the ADC is busy converting a value. Bits 6 and 5 indicate that the temperature

measurement is above or below the limits respectively. Bit 0 indicates that the measured temperature

Each bit is cleared individually when the status register is read, provided that the error condition for

that bit no longer exists.

if the status register has not been cleared.

4.8

Configuration Register

The configuration register controls the functionality of the temperature measurements.

Table 4.4 Status Register

STATUS REGISTER

BIT

NAME

FUNCTION

7

Busy

1 when ADC is converting

6

THIGH

1 when Temperature High Limit is exceeded

5

TLOW

1 when Temperature Low Limit is exceeded

4Reserved

3Reserved

2Reserved

1Reserved

0

THRM

1 when THERM limit is exceeded