MAX6626RMTT+T【PDF 11/14 页】IC TEMP SENSOR I2C 6-TDFN

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MAX6625/MAX6626

9-Bit/12-Bit Temperature Sensors with

C-Compatible Serial Interface in a SOT23

Maxim Integrated

drain, and the MAX6625R/MAX6626R output includes

an internal 35k& (typ) pullup resistor. Figure 6 shows

the OT alarm operation and reset details.

Fault Queue

A programmable fault queue on the MAX6625/

MAX6626 eliminates spurious alarm activity in noisy

environments. The queue sets the number of consecu-

tive out-of-tolerance temperature readings that must

occur before the OT alarm output is toggled. An out-of-

tolerance reading is above T

HIGH

or below T

LOW

. The

fault queue depth defaults to one at power-up and may

be programmed to one, two, four, or six consecutive

conversions. Any time the conversion result is in toler-

ance, and OT is not asserted, the queue is cleared,

even if it contains some out-of-tolerance counts.

Additionally, the fault queue automatically clears at

power-up, in shutdown, or if a master writes to any of

the T

HIGH

, T

LOW

, or configuration registers. Whenever

the fault queue is cleared, OT is deasserted.

For example, the fault queue is set to four, two consec-

utive out-of-tolerance readings have occurred, and the

master writes to the T

LOW

cleared and begins to look for four new consecutive

out-of-tolerance conversions.

Comparator Mode

In comparator mode, OT is asserted when the number

of consecutive conversions exceeding the value in the

HIGH

OT deasserts when the number of consecutive conver-

sions less than the value in the T

LOW

to the depth of the fault queue. T

HIGH

minus T

LOW

the effective hysteresis of the OT output.

For example, if T

HIGH

is set to +100癈, T

LOW

is set to

+80癈, and the fault queue depth is set to four, OT

does not assert until four consecutive conversions

exceed +100癈. Then, OT does not deassert until four

consecutive conversions are less than +80癈.

Comparator mode allows autonomous clearing of an OT

fault without the intervention of a master and is ideal to

use for driving a cooling fan (Figure 7).

Interrupt Mode

In interrupt mode, the MAX6625/MAX6626 look for a

HIGH

or a T

LOW

fault based on previous fault activity.

The OT pin asserts an alarm for an undertemperature

fault, as well as for an overtemperature fault, depending

on certain conditions. If the fault queue is cleared at

power-up, the IC looks for a T

HIGH

fault. After a T

HIGH

fault, the IC looks for a T

LOW

fault. After a T

LOW

fault,

the IC looks for a T

HIGH

fault, and it bounces back and

forth if properly deasserted each time. Once either fault

has occurred, it remains active indefinitely until

deasserted by a read of any register, and the device

then begins to look for a fault of the opposite type. Also,

if the fault queue is cleared, OT is deasserted and the

IC once again looks for a T

HIGH

fault. The activation of

any fault is subject to the depth of the fault queue.

DIE

TEMPERATURE

TIME

HIGH

LOW

(COMPARATOR MODE)

(INTERRUPT MODE)

TEMPERATURE RESPONSE

SHOWN WITH OT SET FOR

ACTIVE LOW

*THIS ASSUMES DEASSERTION OF OT BY A

MASTER THROUGH THE SERIAL INTERFACE.

SEE INTERRUPT MODE SECTION.

Figure 6. OT Alarm Output and Reset Diagram

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