1°C Dual SMBus Sensor with Resistance Error Correction

Datasheet

SMSC EMC1002

13

Revision 1.3 (03-24-06)

DATASHEET

4.7

Standby Mode

The EMC1002 can be set to standby mode (low power) by setting a bit in the Configuration Register

as described in 4.10, "Configuration Register," on page 14. This shuts down all internal analog

functions while the SMBus remains enabled. When the EMC1002 is in standby mode, a One-Shot

command measurement can be initiated. The user may also write new values to the limit registers

described in 4.12, "Limit Registers," on page 15 while in standby. If the previously stored temperature

4.8

Register Allocation

The registers shown in Table 4.3 are accessible through the SMBus.

Note 4.5

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 registers as shown. A power-on-reset is initiated

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

The EMC1002 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

Table 4.3 EMC1002 Register Map

READ

ADDRESS

(HEX)

WRITE

ADDRESS

(HEX)

REGISTER NAME

POWER-ON DEFAULT

00

N/A

Internal Temperature Value High Byte

0000 0000

01

N/A

Remote Temperature Value High Byte

0000 0000

02

N/A

Status

undefined

03

09

Configuration

0000 0000

04

0A

Conversion Rate

0000 1000

05

0B

Internal Temperature High Limit

0101 0101 (85

06

0C

Internal Temperature Low Limit

0000 0000 (0

07

0D

Remote Temperature High Limit High Byte

0101 0101 (85

08

0E

Remote Temperature Low Limit High Byte

0000 0000 (0

N/A

0F

One-Shot

10

N/A

Remote Temperature Value Low Byte

0000 0000

11

11

Scratchpad Byte 1

0000 0000

12

12

Scratchpad Byte 2

0000 0000

13

13

Remote Temperature High Limit Low Byte

0000 0000

14

14

Remote Temperature Low Limit Low Byte

0000 0000

19

19

Remote THERM Limit

0101 0101 (85

20

20

Internal THERM Limit

0101 0101 (85

21

21

THERM Hysteresis

0000 1010 (10

22

22

Consecutive ALERT

0000 0001

27

27

Remote Ideality Factor

0001 0010 (1.008)

29

N/A

Internal Temperature Value Low Byte

0000 0000

FD

Product ID

0000 0010 - EMC1002-1

0000 0011 - EMC1002-2

FE

N/A

Manufacture ID

0101 1101

FF

N/A

Revision Number

0000 0001 Note 4.5