EMC1001 datasheet(14/16 Pages) SMSC

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1.5°C SMBus Temperature Sensor in Miniature SOT-23

Datasheet

Revision 1.6 (01-29-07)

SMSC EMC1001

DATASHEET

Bit 7 is used to mask the ALERT/THERM2 signal. When this bit is set to 0, any out of limit condition

will assert ALERT/THERM2. This bit is ignored if the ALERT/THERM2 pin is configured as THERM2 signal

by bit 5.

Bit 6 initiates ADC conversions.

When this bit is low, the ADC will convert temperatures in a

continuous mode.

When this bit is high, the ADC will be in standby mode, thus reducing supply

current significantly though the SMBus will still be active. If bit 6 is 1 and the one-shot register is

written to, the ADC will execute a temperature measurement and then return to standby mode.

Bit 5 sets the ALERT/THERM2 pin to act as either an SMBALERT# signal or as the THERM2 signal. If

bit 5 is set to 1 the ALERT/THERM2 pin acts as the THERM2 signal and bit 7 is ignored.

4.9

Conversion Rate Register

The conversion rate register determines how many times the temperature value will be updated per

second. The lowest 4 bits configure a programmable delay that waits between consecutive conversion

cycles to obtain the desired conversion rate. Table 4.6 shows the conversion rate and the associated

quiescent current.

Table 4.5 Configuration Register

CONFIGURATION REGISTER

BIT

NAME

FUNCTION

DEFAULT

MASK1

0 = ALERT enabled

1 = ALERT disabled

RUN/STOP

0 = Active mode (continuously running)

1 = Standby mode

ALERT

or THERM2

0 = ALERT

1 = THERM2

4 – 0

Reserved

Table 4.6 Conversion Rates

CONVERSION RATE

VALUE

CONVERSIONS/SECOND

TYPICAL QUIESCENT CURRENT (

μA)

00h

0.0625

01h

0.125

02h

0.25

03h

0.5

04h

05h

06h

07h

109

08h

182

09h

326

0Ah to FFh

Reserved

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