LM75CIM-5 National Semiconductor, LM75CIM-5 Datasheet - Page 8

• Manufacturer Part Number: LM75CIM-5
• Description: Temperature Sensor IC
• Manufacturer: National Semiconductor

Specifications of LM75CIM-5

• Mounting Type: Surface Mount
• Supply Voltage Min: 3V
• Operating Temperature Max: 125°C
• Peak Reflow Compatible (260 C): No
• Ic Function: Temperature Sensor IC
• Supply Voltage Max: 5.5V
• Leaded Process Compatible: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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1.0 Functional Description
by crossing T
Temperature going below T
indefinitely until being reset by a read. Placing the LM75 in
shutdown mode also resets the O.S. Output.
1.2 POWER UP AND POWER DOWN
The LM75 always powers up in a known state. The power up
default conditions are:
1. Comparator mode
2. T
3. T
4. O.S. active low
5. Pointer = “00”
If the LM75 is not connected to the I
will act as a stand-alone thermostat with the above tempera-
ture settings.
When the supply voltage is less than about 1.7V, the LM75 is
considered powered down. As the supply voltage rises
Note 14: These interrupt mode resets of O.S. occur only when LM75 is read or placed in shutdown. Otherwise, O.S. would remain active indefinitely for any event.
OS
HYST
= 80˚C
= 75˚C
OS
, then reset, it can be activated again only by
HYST
. Again, it will remain active
FIGURE 4. O.S. Output Temperature Response Diagram
2
C bus on power up, it
(Continued)
8
above the nominal 1.7V power up threshold, the internal
registers are reset to the power up default values listed
above.
1.3 I
The LM75 operates as a slave on the I
line is an input (no clock is generated by the LM75) and the
SDA line is a bi-directional serial data path. According to I
bus specifications, the LM75 has a 7-bit slave address. The
four most significant bits of the slave address are hard wired
inside the LM75 and are “1001”. The three least significant
bits of the address are assigned to pins A2–A0, and are set
by connecting these pins to ground for a low, (0); or to +V
for a high, (1).
Therefore, the complete slave address is:
MSB
1
2
C BUS INTERFACE
0
0
1
A2
01265807
2
C bus, so the SCL
A1
LSB
A0
2
C
S