MAX6602UE9A+T【PDF 8/18 页】IC TEMP MONITOR 5CH 16-TSSOP

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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

MAX6602 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 MAX6602 to detect a diode fault. Once a diode fault

is detected, the MAX6602 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.

Five-Channel Precision Temperature Monitor

8 _______________________________________________________________________________________

Write Byte Format

Read Byte Format

Send Byte Format

Receive Byte Format

Slave Address: equiva-

lent to chip-select line of

a 3-wire interface

Command Byte: selects to

which register you are writing

Data Byte: data goes into the register

set by the command byte (to set

thresholds, configuration masks, and

sampling rate)

Slave Address: equiva-

lent to chip-select line

Command Byte: selects

from which register you

are reading

Slave Address: repeated

due to change in data-

flow direction

Data Byte: reads from

the register set by the

command byte

Command Byte: sends com-

mand with no data, usually

used for one-shot command

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

S = Start condition

Shaded = Slave transmission

P = Stop condition

/// = Not acknowledged

ADDRESS

ACK

DATA

///

7 bits

8 bits

ACK

COMMAND

ACK

8 bits

ADDRESS

7 bits

ACK

DATA

8 bits

ACK

COMMAND

8 bits

ACK

ADDRESS

7 bits

ADDRESS

ACK

COMMAND

ACK

ADDRESS

7 bits

8 bits

7 bits

ACK

DATA

8 bits

///

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 (short or open)

1111 1111

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

+0.875

111X XXXX

Table 2. Extended Resolution Temperature

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