Datasheet

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
temperature 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
greater than T
LOW
+ T
HYST
.
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.
Figure 2. Example of ALERT Operation in Interrupt Mode
Figure 1. MAX6662 Simplified Functional Diagram
T
HIGH
- T
HYST
T
HIGH
T
LOW
T
LOW
+ T
HYST
ALERT
TEMPERATURE
LAST INTERRUPT MISSED, BUT
THRESHOLD STILL CHANGES TO T
HIGH
.
* * **
TEMPERATURE READ
TEMPERATURE
OT
SERIAL INTERFACE
V
CC
SIO
SCLK
CONFIGURATION
CS
ALERT
T
LOW
T
HIGH
T
MAX
T
HYST
12 -BIT
+ SIGN
ADC
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Maxim Integrated │ 5
MAX6662 12-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface