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MAX6642

±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm

Maxim Integrated 

MAX6642

±1°C, SMBus-Compatible Remote/

Local Temperature Sensor with

Overtemperature Alarm

Table 3. Command-Byte Assignments

ADDRESS

POR STATE

F U N C T IO N

00h 00h (0000 0000)

Read local temperature

01h 00h (0000 0000)

Read remote temperature

02h N/A

Read status byte

03h 10h (0001 0000)

Read configuration byte

05h 46h (0100 0110) +70°C Read local high limit

07h 78h (0111 1000) +120°C Read remote high limit

09h N/A

Write configuration byte

0Bh N/A

Write local high limit

0Dh N/A

Write remote high limit

0Fh N/A

Single shot

10h 0000 0000

Read remote extended

temperature

11h 0000 0000

FEh 4Dh (0100 1101)

Read internal extended

temperature

Read manufacturer ID

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 I2C General Call.

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

Table 4. Configuration-Byte Bit Assignments

BIT

7 (MSB)

6

5

4

3 to 0

NAME

MASK1

STOP/RUN

External only

Fault

queue

—

POR STATE

0

0

0

1

0000

FUNCTION

A 1 masks off (disables) the ALERT interrupts.

A 1 puts the MAX6642 into standby mode.

A 1 disables local temperature measurements so that only

remote temperature is measured. The measurement rate

becomes 8Hz.

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

are required to set ALERT.

Reserved.

Table 5. Status-Byte Bit Assignments

BIT

7 (MSB)

NAME

BUSY

POR STATE

0

6

LHIGH

0

5

—

0

4

RHIGH

0

3

—

0

2

OPEN

0

1 to 0

—

0

FUNCTION

A 1 indicates the MAX6642 is busy converting.

A 1 indicates an internal high-temperature fault. Clear

LHIGH with a POR or by reading the status byte.

Reserved.

A 1 indicates an external high-temperature fault. Clear

RHIGH with a POR or by reading the status byte.

Reserved.

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

POR or by reading the status byte when the condition no

longer exists.

Reserved.

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