MAX6689UP34+【PDF 12/19 页】IC 7CH PREC TEMP MONITOR 20TSSOP

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In both cases, the alert is cleared even if the fault condi-

tion exists, but the ALERT output reasserts at the end of

the next conversion. The bits indicating the fault for the

OVERT interrupt output clear only on reading the status 2

status 2 register does not clear the OVERT interrupt out-

put. To eliminate the fault condition, either the measured

temperature must drop below the temperature threshold

minus the hysteresis value (4癈), or the trip temperature

must be set at least 4癈 above the current temperature.

Applications Information

Remote-Diode Selection

The MAX6689 directly measures the die temperature of

CPUs and other ICs that have on-chip temperature-

sensing diodes (see the Typical Application Circuit) or

it can measure the temperature of a discrete diode-

connected transistor.

Effect of Ideality Factor

The accuracy of the remote temperature measure-

ments depends on the ideality factor (n) of the remote

diode (actually a transistor). The MAX6689 is opti-

mized for n = 1.012. A thermal diode on the substrate

of an IC is normally a pnp with the base and emitter

brought out the collector (diode connection) grounded.

DXP_ must be connected to the anode (emitter) and

DXN_ must be connected to the cathode (base) of this

pnp. If a sense transistor with an ideality factor other

than 1.012 is used, the output data is different from the

data obtained with the optimum ideality factor.

Fortunately, the difference is predictable. Assume a

remote-diode sensor designed for a nominal ideality

7-Channel Precision Temperature Monitor

12 ______________________________________________________________________________________

BIT

NAME

POR

STATE

FUNCTION

7 (MSB)

STOP

Standby-Mode Control Bit. If STOP is set to logic 1, the MAX6689 stops

converting and enters standby mode.

POR

Reset Bit. Set to logic 1 to put the device into its power-on state. This bit is self-

clearing.

TIMEOUT

Timeout Enable Bit. Set to logic 0 to enable SMBus timeout.

Fast remote 1

Channel 1 Fast-Conversion Bit. Set to logic 1 to enable fast conversion of

channel 1.

Resistance

cancellation

Resistance Cancellation Bit. When set to logic 1, the MAX6689 cancels series

resistance in the channel 1 thermal diode.

Reserved

Table 4. Configuration 1 Register

Table 5. Configuration 2 Register

BIT

NAME

POR

STATE

FUNCTION

7 (MSB)

Reserved

Mask Local ALERT

Local Alert Mask. Set to logic 1 to mask local channel ALERT.

Mask ALERT 6

Channel 6 Alert Mask. Set to logic 1 to mask channel 6 ALERT.

Mask ALERT 5

Channel 5 Alert Interrupt Mask. Set to logic 1 to mask channel 5 ALERT.

Mask ALERT 4

Channel 4 Alert Mask. Set to logic 1 to mask channel 4 ALERT.

Mask ALERT 3

Channel 3 Alert Interrupt Mask. Set to logic 1 to mask channel 3 ALERT.

Mask ALERT 2

Channel 2 Alert Mask. Set to logic 1 to mask channel 2 ALERT.

Mask ALERT 1

Channel 1 Alert Mask. Set to logic 1 to mask channel 1 ALERT.

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