MAX6694TE9A+T【PDF 8/18 页】IC TEMP MONITOR 5CH 16TQFN

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5-Channel Precision Temperature Monitor

with Beta Compensation

8 _______________________________________________________________________________________

Figure 2. SMBus Protocols

ADDRESS

ACK

DATA

ACK

COMMAND

7 BITS

8 BITS

SLAVE ADDRESS: EQUIVA-

LENT TO CHIP-SELECT LINE OF

A 3-WIRE INTERFACE

DATA BYTE: DATA GOES INTO THE REGISTER

SET BY THE COMMAND BYTE (TO SET

THRESHOLDS, CONFIGURATION MASKS, AND

SAMPLING RATE)

WRITE BYTE FORMAT

ADDRESS

ACK

///

DATA

COMMAND

7 BITS

8 BITS

READ BYTE FORMAT

SLAVE ADDRESS: EQUIVA-

LENT TO CHIP SELECT LINE

COMMAND BYTE: SELECTS

FROM WHICH REGISTER YOU

ARE READING

COMMAND BYTE: SELECTS

TO WHICH REGISTER YOU

ARE WRITING

ADDRESS

ACK

COMMAND

7 BITS

8 BITS

SEND BYTE FORMAT

COMMAND BYTE: SENDS COM-

MAND WITH NO DATA, USUALLY

USED FOR ONE-SHOT COMMAND

ADDRESS

ACK

///

DATA

7 BITS

8 BITS

RECEIVE BYTE FORMAT

DATA BYTE: READS DATA FROM

THE REGISTER COMMANDED

BY THE LAST READ BYTE OR

WRITE BYTE TRANSMISSION;

ALSO USED FOR SMBus ALERT

RESPONSE RETURN ADDRESS

SLAVE ADDRESS: REPEATED

DUE TO CHANGE IN DATA-

FLOW DIRECTION

DATA BYTE: READS FROM

THE REGISTER SET BY THE

COMMAND BYTE

S = START CONDITION.

P = STOP CONDITION.

SHADED = SLAVE TRANSMISSION.

/// = NOT ACKNOWLEDGED.

350礎. During either software or hardware standby,

data is retained in memory. During hardware standby,

the SMBus interface is inactive. During software stand-

by, the SMBus interface is active and listening for

SMBus commands. The timeout is enabled if a start

condition is recognized on SMBus. Activity on the

SMBus causes the supply current to increase. If a

standby command is received while a conversion is in

progress, the conversion cycle is interrupted, and the

temperature registers are not updated. The previous

data is not changed and remains available.

Operating-Current Calculation

The MAX6694 operates at different operating-current

levels depending on how many external channels are in

use. Assume that I

CC1

is the operating current when

the MAX6694 is converting the remote channel 1 and

CC2

is the operating current when the MAX6694 is con-

verting the other channels. For the MAX6694 with

remote channel 1 and n other remote channels con-

nected, the operating current is:

= (2 x I

CC1

+ I

CC2

+ n x I

CC2

)/(n + 3)

SMBus Digital Interface

From a software perspective, the MAX6694 appears as

a series of 8-bit registers that contain temperature mea-

surement data, alarm threshold values, and control bits.

A standard SMBus-compatible, 2-wire serial interface is

used to read temperature data and write control bits

and alarm threshold data. The same SMBus slave

address also provides access to all functions.

The MAX6694 employs four standard SMBus protocols:

write byte, read byte, send byte, and receive byte

(Figure 2). The shorter receive byte protocol allows

quicker transfers, provided that the correct data regis-

ter was previously selected by a read byte instruction.

Use caution with the shorter protocols in multimaster

systems, since a second master could overwrite the

command byte without informing the first master. Figure

3 is the SMBus write-timing diagram and Figure 4 is the

SMBus read-timing diagram.

The remote diode 1 measurement channel provides 11

bits of data (1 LSB = +0.125癈). All other temperature-

measurement channels provide 8 bits of temperature

data (1 LSB = +1癈). The 8 most significant bits (MSBs)

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