MAX6622UE9A Просмотр технического описания (PDF) - Maxim Integrated

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MAX6622UE9A

5-Channel Precision Temperature Monitor

Maxim Integrated 

5-Channel Precision Temperature Monitor

Write Byte Format

S

ADDRESS

WR

ACK

COMMAND

ACK

DATA

ACK

P

7 bits

SLAVE ADDRESS: EQUIVALENT

TO CHIP-SELECT LINE OF A

3-WIRE INTERFACE

Read Byte Format

8 bits

COMMAND BYTE: SELECTS TO

WHICH REGISTER YOU ARE

WRITING

8 bits

1

DATA BYTE: DATA GOES INTO THE REGISTER

SET BY THE COMMAND BYTE (TO SET

THRESHOLDS, CONFIGURATION MASKS, AND

SAMPLING RATE)

S ADDRESS WR ACK COMMAND ACK

S ADDRESS RD ACK DATA

///

P

7 bits

SLAVE ADDRESS: EQUIVALENT

TO CHIP-SELECT LINE

8 bits

COMMAND BYTE: SELECTS

FROM WHICH REGISTER YOU

ARE READING

7 bits

SLAVE ADDRESS: REPEATED

DUE TO CHANGE IN DATA-

FLOW DIRECTION

8 bits

DATA BYTE: READS FROM

THE REGISTER SET BY THE

COMMAND BYTE

Send Byte Format

Receive Byte Format

S ADDRESS WR ACK COMMAND ACK P

7 bits

8 bits

COMMAND BYTE: SENDS COM-

MAND WITH NO DATA, USUALLY

USED FOR ONE-SHOT COMMAND

S = Start condition

P = Stop condition

Shaded = Slave transmission

/// = Not acknowledged

S ADDRESS RD ACK DATA ///

P

7 bits

8 bits

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

Figure 2. SMBus Protocols

Table 1. Main Temperature Register

(High Byte) Data Format

Table 2. Extended Resolution Temperature

Register (Low Byte) Data Format

TEMP (°C)

> +127

+127

+126

+25

0

<0

Diode fault (open)

Diode fault (short)

DIGITAL OUTPUT

0111 1111

0111 1111

0111 1110

0001 1001

0000 0000

0000 0000

1111 1111

1111 1111 or 1110 1110

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

register (high byte) data format, and Table 2 shows the

extended resolution register (low byte) data format.

Diode Fault Detection

If a channel’s input DXP_ and DXN_ are left open, the

MAX6622 detects a diode fault. An open diode fault

TEMP (°C)

0

+0.125

+0.250

+0.375

+0.500

+0.625

+0.725

+0.875

DIGITAL OUTPUT

000X XXXX

001X XXXX

010X XXXX

011X XXXX

100X XXXX

101X XXXX

110X XXXX

111X XXXX

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 MAX6622

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

the MAX6622 goes to the next channel in the conversion

sequence. Depending on operating conditions, a short-

ed diode may or may not cause ALERT or OVERT to

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

inputs should be left unconnected.

8 _______________________________________________________________________________________

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