MAX6642ATT94+T【PDF 8/14 页】IC TEMP SENSOR SMBUS 6TDFN

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the ALERT is cleared by responding to the alert

response address and the temperature fault condition

still exists, ALERT is reasserted after the next tempera-

ture-monitoring cycle. To clear ALERT while the tempera-

ture is above the trip threshold, write a new high limit that

is higher than the current temperature. The ALERT out-

put is open drain, allowing multiple devices to share a

common interrupt line.

Alert Response Address

The SMBus alert response interrupt pointer provides

quick fault identification for simple slave devices like

temperature sensors. Upon receiving an ALERT inter-

rupt signal, the host master can broadcast a Receive

Byte transmission to the alert response slave address

(0001 100). Following such a broadcast, any slave

device that generated an interrupt attempts to identify

itself by putting its own address on the bus.

The alert response can activate several different slave

devices simultaneously, similar to the I

C General Call.

If more than one slave attempts to respond, bus arbitra-

?癈, SMBus-Compatible Remote/Local

Temperature Sensor with Overtemperature Alarm

8 _______________________________________________________________________________________

A D D R ESS

R ST A T E

F U N C T IO N

00h

00h ( 0000 0000)

Read l ocal tem

p er atur e

01h

00h ( 0000 0000)

Read r

ote tem p

er atur e

02h

N /A

Read status b yte

03h

10h ( 0001 0000)

Read confi g

ur ati on b yte

05h

46h ( 0100 0110) + 70?C Read l ocal hi g h l i m i t

07h

78h ( 0111 1000) + 120?C Read r em ote hi g h l i m i t

09h

N /A

W r i te confi

g ur ati on b

yte

0Bh

N /A

W r i te l ocal hi g h l

i m i

0D h

N /A

W r i te r em

ote hi g h l i m

i t

0Fh

N /A

S i

ng l e shot

10h

0000 0000

Read r em ote extend ed

tem p er

atur e

11h

0000 0000

Read i nter nal extend ed

tem p er

atur e

FE h

4D h ( 0100 1101)

Read m anufactur er ID

Table 3. Command-Byte Assignments

BIT

NAME

POR STATE

FUNCTION

7 (MSB)

MASK1

A 1 masks off (disables) the ALERT interrupts.

STOP/RUN

A 1 puts the MAX6642 into standby mode.

External only

A 1 disables local temperature measurements so that only

remote temperature is measured. The measurement rate

becomes 8Hz.

Fault

queue

0: ALERT is set by a single fault. 1: Two consecutive faults

are required to set ALERT.

3 to 0

0000

Reserved.

Table 4. Configuration-Byte Bit Assignments

BIT

NAME

POR STATE

FUNCTION

7 (MSB)

BUSY

A 1 indicates the MAX6642 is busy converting.

LHIGH

A 1 indicates an internal high-temperature fault. Clear

LHIGH with a POR or by reading the status byte.

Reserved.

RHIGH

A 1 indicates an external high-temperature fault. Clear

RHIGH with a POR or by reading the status byte.

Reserved.

OPEN

A 1 indicates a diode open condition. Clear OPEN with a

POR or by reading the status byte when the condition no

longer exists.

1 to 0

Reserved.

Table 5. Status-Byte Bit Assignments

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