FM75M8X Fairchild Semiconductor, FM75M8X Datasheet - Page 7

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FM75M8X

Manufacturer Part Number
FM75M8X
Description
TEMPERATURE SENSOR LV 8SOIC
Manufacturer
Fairchild Semiconductor
Datasheet

Specifications of FM75M8X

Function
Temp Monitoring System (Sensor)
Topology
ADC (Sigma Delta), Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-40°C ~ 125°C
Output Type
SMBus™
Output Alarm
Yes
Output Fan
No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Full Temp Accuracy
4 C
Digital Output - Bus Interface
I2C, SMBus
Digital Output - Number Of Bits
9 bit to 12 bit
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.7 V
Description/function
Semiconductor
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Supply Current
500 uA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2006 Fairchild Semiconductor Corporation
FM75 Rev. 1.0.8
Comparator Mode
In comparator mode, each time a temperature-to-digital
(T-to-D) temperature conversion occurs, the new digital
temperature is compared to the value stored in the T
and T
secutive temperature measurements are greater than
the value stored in the T
vated. For example, if bits F1 and F0 are equal to “10”
(fault tolerance = 4), four consecutive temperature mea-
surements must exceed T
Once the OS output is active, it remains active until the
first time the measured temperature drops below the
temperature stored in the T
of the alarm in comparator mode with fault tolerance = 2
is illustrated in Figure 4.
HYST
registers. If a fault tolerance number of con-
OS (Comparator Mode)
Temperature-to-Digital
OS (Interrupt Mode)
Figure 4. Thermal Alarm Operation in Comparator and Interrupt Modes
OS
OS
register, the OS output is acti-
HYST
Conversion
to activate the OS output.
T
register. The operation
T
HYST
OS
For this example:
Fault Tolerance = 2
Output Polarity = Active Low
OS
7
Interrupt Mode
In interrupt mode, the OS output first becomes active
after a fault tolerance number of consecutive tempera-
ture measurements exceed the value stored in the T
register (similar to comparator mode). Once OS is active,
it can only be cleared by a user read from any of the
FM75 registers (temperature, configuration, T
T
by setting the shutdown bit in the configuration register to
“1”). Once cleared, the OS output can only be activated
the next time by a fault tolerance number of consecutive
temperature measurements lower than the value stored
in T
deactivated by a user read or shutdown. In interrupt
mode, the activate/clear cycle for OS has the following
pattern: temperature > T
clear, temperature > T
alarm in interrupt mode with fault tolerance = 2 is illus-
trated in Figure 4.
HYST
HYST
) or by putting the FM75 into shutdown mode (i.e.,
. Once it is activated, the OS output can only be
Read (or Shutdown)
OS
OS
, clear, etc. The operation of the
, clear, temperature < T
www.fairchildsemi.com
OS
HYST
, or
OS
,

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