MAX6689UP34+【PDF 9/19 页】IC 7CH PREC TEMP MONITOR 20TSSOP

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Alarm Threshold Registers

There are 11 alarm threshold registers that store over-

temperature ALERT and OVERT threshold values.

Seven of these registers are dedicated to store one

local alert temperature threshold limit and six remote

alert temperature threshold limits (see the ALERT

Interrupt Mode section). The remaining four registers

are dedicated to remote channels 1, 4, 5, and 6 to store

overtemperature threshold limits (see the OVERT

Overtemperature Alarms section). Access to these reg-

isters is provided through the SMBus interface.

ALERT Interrupt Mode

An ALERT interrupt occurs when the internal or external

temperature reading exceeds a high-temperature limit

(user programmable). The ALERT interrupt output sig-

nal can be cleared by reading the status register(s)

associated with the fault(s) or by successfully respond-

ing to an alert response address transmission by the

master. In both cases, the alert is cleared but is

reasserted at the end of the next conversion if the fault

condition still exists. The interrupt does not halt automat-

ic conversions. The ALERT output is open drain so that

multiple devices can share a common interrupt line. All

ALERT interrupts can be masked using the configuration

3 register. The POR state of these registers is shown in

Table 1.

7-Channel Precision Temperature Monitor

_______________________________________________________________________________________ 9

SMBCLK

A = START CONDITION.

B = MSB OF ADDRESS CLOCKED INTO SLAVE.

C = LSB OF ADDRESS CLOCKED INTO SLAVE.

D = R/W BIT CLOCKED INTO SLAVE.

E F

SMBDATA

SU:STA

HD:STA

LOW

HIGH

SU:DAT

SU:STO

BUF

E = SLAVE PULLS SMBDATA LINE LOW.

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER.

G = MSB OF DATA CLOCKED INTO SLAVE.

H = LSB OF DATA CLOCKED INTO SLAVE.

I = MASTER PULLS DATA LINE LOW.

J = ACKNOWLEDGE CLOCKED INTO SLAVE.

K = ACKNOWLEDGE CLOCK PULSE.

L = STOP CONDITION.

M = NEW START CONDITION.

Figure 3. SMBus Write-Timing Diagram

SMBCLK

E F

I J K

SMBDATA

SU:STA

HD:STA

LOW

HIGH

SU:DAT

HD:DAT

SU:STO

BUF

A = START CONDITION.

B = MSB OF ADDRESS CLOCKED INTO SLAVE.

C = LSB OF ADDRESS CLOCKED INTO SLAVE.

D = R/W BIT CLOCKED INTO SLAVE.

E = SLAVE PULLS SMBDATA LINE LOW.

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER.

G = MSB OF DATA CLOCKED INTO MASTER.

H = LSB OF DATA CLOCKED INTO MASTER.

I = MASTER PULLS DATA LINE LOW.

J = ACKNOWLEDGE CLOCKED INTO SLAVE.

K = ACKNOWLEDGE CLOCK PULSE.

L = STOP CONDITION.

M = NEW START CONDITION.

Figure 4. SMBus Read-Timing Diagram

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