MAX6689UP34+【PDF 8/19 页】IC 7CH PREC TEMP MONITOR 20TSSOP

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resolution register should be read first. This prevents

the most significant bits from being overwritten by new

conversion results until they have been read. If the

most significant bits have not been read within an

SMBus timeout period (nominally 37ms), normal updat-

ing continues. Table 1 shows the main temperature

extended resolution register (low-byte) data format.

Diode Fault Detection

If a channels input DXP_ and DXN_ are left open, the

MAX6689 detects a diode fault. An open diode fault does

not cause either ALERT or OVERT to assert. A bit in the

status register for the corresponding channel is set to 1

and the temperature data for the channel is stored as all

1s (FFh). It takes approximately 4ms for the MAX6689 to

detect a diode fault. Once a diode fault is detected, the

MAX6689 goes to the next channel in the conversion

sequence. Depending on operating conditions, a shorted

diode may or may not cause ALERT or OVERT to assert,

so if a channel will not be used, disconnect its DXP and

DXN inputs.

7-Channel Precision Temperature Monitor

8 _______________________________________________________________________________________

Figure 2. SMBus Protocols

TEMP (癈)

DIGITAL OUTPUT

> +127

0111 1111

+127

0111 1111

+126

0111 1110

+25

0001 1001

0000 0000

< 0

0000 0000

Diode fault (open)

1111 1111

Diode fault (short)

1111 1111 or 1110 1110

Table 1. Main Temperature Register

(High-Byte) Data Format

TEMP (癈)

DIGITAL OUTPUT

000X XXXX

+0.125

001X XXXX

+0.250

010X XXXX

+0.375

011X XXXX

+0.500

100X XXXX

+0.625

101X XXXX

+0.725

110X XXXX

Table 2. Extended Resolution Temperature

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

WHICH REGISTER YOU ARE

REDING FROM

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.

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