DS75U+T&R Maxim Integrated Products, DS75U+T&R Datasheet - Page 8

• Manufacturer Part Number: DS75U+T&R
• Description: IC THERMOMETER/STAT DIG 8-MSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS75U+T&R

• Function: Thermometer, Thermostat
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

compared to the values in the T
comparison and the operating mode. The number of T
comparison is equal to the conversion resolution set by the R1 and R0 bits in the configuration register.
For example, it the resolution is 9 bits, only the 9 MSbs of T
comparator.
The active state of the O.S. output can be changed via the POL bit in the configuration register. The
power-up default is active low.
If the user does not wish to use the thermostat capabilities of the DS75, the O.S. output should be left
floating. Note that if the thermostat is not used, the T
storage of system data.
Comparator Mode — When the thermostat is in comparator mode, O.S. can be programmed to operate
with any amount of hysteresis. The O.S. output becomes active when the measured temperature exceeds
the T
configuration register. O.S. then stays active until the first time the temperature falls below the value
stored in T
Thermostat comparator mode operation with FT = 2 is illustrated in Figure 4.
Interrupt Mode — In interrupt mode, the O.S. output first becomes active when the measured
temperature exceeds the T
configuration register. Once activated, O.S. can only be cleared by either putting the DS75 into shutdown
mode or by reading from any register (temperature, configuration, T
O.S. has been deactivated, it will only be reactivated when the measured temperature falls below the
T
putting the device into shutdown mode or reading any register. Thus, this interrupt/clear process is
cyclical between T
Thermostat interrupt mode operation with FT = 2 is illustrated in Figure 4.
Figure 4. O.S. OUTPUT OPERATION EXAMPLE
HYST
In this example the DS75
is configured to have a
fault tolerance of 2.
OS
value a consecutive number of times equal to the FT value. Again, O.S can only be cleared by
value a consecutive number of times as defined by the F1 and F0 fault tolerance (FT) bits in the
O.S. Output - Comparator Mode
HYST
O.S. Output - Interrupt Mode
. Putting the device into shutdown mode does not clear O.S. in comparator mode.
OS
and T
OS
HYST
Temperature
OS
value a consecutive number of times equal to the FT value in the
and T
events (i.e, T
Inactive
Inactive
Active
T
Active
HYST
HYST
T
OS
registers, and then O.S. is updated based on the result of the
OS
, clear, T
8 of 14
OS
OS
and T
HYST
and T
OS
and T
Conversions
, clear, T
HYST
HYST
HYST
OS
registers can be used for general
, or T
bits used during the thermostat
will be used by the thermostat
OS
Assumes a read
, clear, T
has occurred
HYST
) on the device. Once
HYST
, clear, etc.).
DS75