STLM75M2F STMicroelectronics, STLM75M2F Datasheet - Page 12

• Manufacturer Part Number: STLM75M2F
• Description: IC TEMP SNSR DGTL WATCHDOG 8SOIC
• Manufacturer: STMicroelectronics

Specifications of STLM75M2F

• Function: Temp Sensor, Watchdog
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• For Use With: 497-10508 - BOARD EVAL FOR MEMS SENSORS497-10048 - BOARD EVAL ACCELEROMETER497-8848 - EVAL DAUGHTER STLM75 8-SOIC497-6238 - BOARD STLM75/STDS75/ST72F651
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6926-2; STLM75M2F

Operation
2.2
2.3
12/40
Thermal alarm function
The STLM75 thermal alarm function provides user-programmable thermostat capability and
allows the STLM75 to function as a standalone thermostat without using the serial interface.
The OS output is the alarm output. This signal is an open drain output, and at power-up, this
pin is configured with active-low polarity by default.
Comparator mode
In comparator mode, each time a temperature-to-digital (T-to-D) conversion occurs, the new
digital temperature is compared to the value stored in the T
tolerance number of consecutive temperature measurements are greater than the value
stored in the T
For example, if the FT1 and FT0 bits are equal to “10” (fault tolerance = 4), four consecutive
temperature measurements must exceed T
output is active, it will remain active until the first time the measured temperature drops
below the temperature stored in the T
When the thermostat is in comparator mode, the OS can be programmed to operate with
any amount of hysteresis. The OS output becomes active when the measured temperature
exceeds the T
tolerance (FT) bits in the configuration register. The OS then becomes inactive when the
temperature falls below the value stored in T
as defined by the fault tolerance bits (FT1 and FT0). Putting the device into shutdown mode
does not clear OS in comparator mode.
OS
OS
value a consecutive number of times as defined by the FT1 and FT0 fault
register, the OS output will be asserted.
Doc ID 13296 Rev 12
HYS
register.
OS
HYS
to activate the OS output. Once the OS
register for a consecutive number of times
OS
and T
HYS
registers. If a fault
STLM75