MAX6642(2003) 查看數據表（PDF） - Maxim Integrated

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MAX6642
(Rev.:2003)

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

Maxim Integrated 

±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

Read internal extended

temperature

FEh 4Dh (0100 1101)

Read manufacturer ID

(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-

tion rules apply, and the device with the lower address

code wins. The losing device does not generate an

acknowledge and continues to hold the ALERT line low

until cleared. (The conditions for clearing an ALERT

vary depending on the type of slave device.)

Successful completion of the alert response protocol

clears the interrupt latch. If the condition still exists, the

device reasserts the ALERT interrupt at the end of the

next conversion.

Command Byte Functions

The 8-bit command byte register (Table 3) is the master

index that points to the various other registers within the

MAX6642. The register’s POR state is 0000 0000, so a

Receive Byte transmission (a protocol that lacks the

Table 4. Configuration-Byte Bit Assignments

BIT

7 (MSB)

6

NAME

MASK1

STOP/RUN

POR STATE

0

0

5

External only

0

4

3 to 0

Fault

queue

—

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.

8 _______________________________________________________________________________________

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