EMC1001_15 datasheet(10/24 Pages) MICROCHIP

10 / 24 page

EMC1001

DS20005411A-page 10

 2015 Microchip Technology Inc.

The eight most significant bits are stored in the

Temperature Value High Byte register and the two least

significant bits stored in the Temperature Value Low

Byte register as outlined in Table 4-2. The six LSB

positions of the Temperature Value Low Byte register

always read zero. In Table 4-2, the upper case “B”

shows the bit position of a 16-bit word created by

concatenating the High Byte and Low Byte, and the

lower case “b” shows the bit position in the 10-bit value.

4.3

ALERT/THERM2 Output

The ALERT/THERM2 output asserts if an out-of-limit

measurement is detected (TA  low limit or TA > high

limit). The ALERT/THERM2 pin is an open-drain output

and

requires

pull-up

resistor

VDD. The

ALERT/THERM2 pin can be used as an SMBALERT#,

or may be configured as a second THERM output.

As described in the SMBus specification, an SMBus

slave may inform the SMBus master that it wants to talk

by asserting the SMBALERT# signal. One or more

ALERT outputs can be hardwired together as a

wired-OR bus to a common input.

The ALERT/THERM2 pin resets when the EMC1001

responds

alert

response

address

(ARA = 0001 100) sent by the host, and if the out-of-

limit condition no longer exists, but it does not reset if

the error condition remains. The ALERT/THERM2 pin

can be masked so that it will not assert in the event of

an out-of-limit temperature measurement, except when

it is configured as a second THERM pin.

FIGURE 4-3:

ALERT Response to Temperature Limits Exceeded.

The ALERT/THERM2 pin can be configured as a sec-

ond THERM pin that asserts when the temperature

measurement exceeds the Temperature High Limit

value. The output will not de-assert until the tempera-

ture drops below the Temperature High Limit, minus the

THERM Hysteresis value.

TABLE 4-2:

BIT POSITION OF TWO BYTE VALUES

High Byte

Low Byte

B15

B14

B13

B12

B11

B10

Temp

Time

Temperature High Limit

Temperature Low Limit

ALERT/THERM2

Logic High

Logic

Level

SMBus ARA

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