MAX6662EVKIT+【PDF 5/9 页】EVALUATION KIT FOR MAX6662

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12-Bit + Sign Temperature Sensor with

SPI-Compatible Serial Interface

V CC

OT

12 -BIT

+ SIGN

ADC

ALERT

TEMPERATURE T LOW

T HIGH

T MAX

T HYST CONFIGURATION

SIO

SCLK

CS

Figure 1. MAX6662 Simplified Functional Diagram

SERIAL INTERFACE

For example: If T HIGH is set to 100°C and T HYST is set

to 20°C, ALERT does not assert until temperature

exceeds 100°C. If the temperature is then read through

the serial interface, ALERT deasserts. ALERT asserts

again when temperature is less than 80°C (Figure 2).

Comparator Mode

In the comparator mode, ALERT is asserted when tem-

Overtemperature Alert

OT operates only in comparator mode. The OT pin is

asserted when the temperature exceeds T MAX , and

deasserted when the temperature drops below

T MAX - T HYST . A read operation does not reset OT .

OT is an open-drain active-low (default) output, but can

be programmed to active-high.

perature exceeds the value in the T HIGH register, or is

lower than the value in the T LOW register. ALERT

deasserts when temperature is less than T HIGH - T HYST

or greater than T LOW + T HYST . Reading the registers

does not deassert ALERT .

For example: If T HIGH is set to 100°C and T LOW is set

to 80°C, ALERT does not assert until temperature

exceeds 100°C, or is below 80°C. Then, ALERT only

deasserts if temperature is less than T HIGH - T HYST or

T HIGH

T HIGH - T HYST

T LOW + T HYST

T LOW

ALERT

TEMPERATURE

greater than T LOW + T HYST .

* TEMPERATURE READ

*

* *

LAST INTERRUPT MISSED, BUT

THRESHOLD STILL CHANGES TO T HIGH .

Figure 2. Example of ALERT Operation in Interrupt Mode

_______________________________________________________________________________________

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