MAX31723MUA+ Maxim Integrated Products, MAX31723MUA+ Datasheet - Page 9

• Manufacturer Part Number: MAX31723MUA+
• Description: Board Mount Temperature Sensors SPI/3-Wire Digital Temp Sensor
• Manufacturer: Maxim Integrated Products

Specifications of MAX31723MUA+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The devices’ thermostat can be programmed to power
up in either comparator mode or interrupt mode, which
activate and deactivate the open-drain thermostat output
(TOUT) based on user-programmable trip points (T
and T
Celsius temperature values in two’s complement format
and are stored in EEPROM memory. As such, the values
are nonvolatile and can be programmed prior to install-
ing the devices for stand-alone operation.
The data format of the T
identical to that of the temperature register (Figure 5).
After every temperature conversion, the measurement is
compared to the values stored in the T
registers. The T
locations 03h (LSB) and 04h (MSB), and the T
ister is assigned to address locations 05h (LSB) and
06h (MSB). The TOUT output is updated based on the
result of the comparison and the operating mode of the
devices. The number of T
ing the thermostat comparison is equal to the conversion
resolution set by the R1 and R0 bits in the configuration/
status register. For example, if the resolution is 9 bits,
only the nine MSBs of T
thermostat comparator.
Figure 6. TOUT Operation Example
LOW
). The T
TOUT OUTPUT—COMPARATOR MODE
TOUT OUTPUT—INTERRUPT MODE
HIGH
HIGH
Digital Thermometers and Thermostats
register is assigned to address
HIGH
HIGH
and T
HIGH
TEMPERATURE
and T
and T
and T
LOW
LOW
INACTIVE
INACTIVE
LOW
ACTIVE
ACTIVE
Thermostat
T
T
registers contain
HIGH
LOW
LOW
HIGH
are used by the
bits used dur-
registers is
and T
LOW
HIGH
LOW
reg-
with SPI/3-Wire Interface
If the user does not wish to use the thermostat capa-
bilities of the devices, the TOUT output should be left
unconnected. Note that if the thermostat is not used, the
T
age of system data.
When the thermostat is in comparator mode, TOUT
can be programmed to operate with any amount of
hysteresis. The TOUT output becomes active when the
measured temperature exceeds the T
then stays active until the first time the temperature falls
below the value stored in T
shutdown mode does not clear TOUT in comparator
mode. Figure 6 illustrates thermostat comparator mode
operation.
In interrupt mode, the TOUT output first becomes active
when the measured temperature exceeds the T
value. Once activated, in continuous conversion mode
TOUT can only be cleared by either putting the devices
into shutdown mode or by reading from any register
(configuration/status, temperature, T
on the devices. In one-shot mode, TOUT can only be
cleared by reading from any register (configuration/
status, temperature, T
HIGH
CONVERSIONS
and T
LOW
ASSUMES A READ
HAS OCCURED
registers can be used for general stor-
HIGH
LOW
, or T
. Putting the devices into
Comparator Mode
LOW
Interrupt Mode
HIGH
) on the devices.
HIGH
value. TOUT
, or T
LOW
HIGH
)
9