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| 型号： | LM75BIM-5/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | 0.150 INCH, SOP-8 |
| 文件页数： | 18/18页 |
| 文件大小： | 474K |
| 代理商： | LM75BIM-5/NOPB |
1.0 Functional Description
The LM75 temperature sensor incorporates a band-gap type
temperature sensor and 9-bit ADC (Sigma-Delta Analog-to-
Digital Converter). The temperature data output of the LM75
is available at all times via the I2C bus. If a conversion is in
progress, it will be stopped and restarted after the read. A
digital comparator is also incorporated that compares a series
of readings, the number of which is user-selectable, to user-
programmable setpoint and hysteresis values. The compara-
tor trips the O.S. output line, which is programmable for mode
and polarity.
The LM75A and LM75B contain all the functionality of the
LM75C, plus two additional features:
1.
The LM75A and LM75B have an integrated low-pass
filter on both the SDA and the SCL line. These filters
increase communications reliability in noisy
environments.
2.
The LM75A and LM75B also have a bus fault timeout
feature. If the SDA line is held low for longer than
t
TIMEOUT (see specification) the LM75A and LM75B will
reset to the IDLE state (SDA set to high impedance) and
wait for a new start condition. The TIMEOUT feature is
not functional in Shutdown Mode.
1.1 O.S. OUTPUT, T
OS AND THYST LIMITS
In Comparator mode the O.S. Output behaves like a thermo-
stat. The output becomes active when temperature exceeds
the T
OS limit, and leaves the active state when the tempera-
ture drops below the T
HYST limit. In this mode the O.S. output
can be used to turn a cooling fan on, initiate an emergency
system shutdown, or reduce system clock speed. Shutdown
mode does not reset O.S. state in a comparator mode.
In Interrupt mode exceeding T
OS also makes O.S. active but
O.S. will remain active indefinitely until reset by reading any
register via the I2C interface. Once O.S. has been activated
by crossing T
OS, then reset, it can be activated again only by
Temperature going below T
HYST. Again, it will remain active
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
OS = 80°C
3.
T
HYST = 75°C
4.
O.S. active low
5.
Pointer = “00”
When the supply voltage is less than about 1.7V, the LM75 is
considered powered down. As the supply voltage rises above
the nominal 1.7V power up threshold, the internal registers
are reset to the power up default values listed above.
1.2.1 Stand-Alone Thermostat Mode
If the LM75 is not connected to the I2C bus on power up, it will
act as a stand-alone thermostat with the power up default
conditions listed above. It is optional, but recommended, to
connect the address pins (A2, A1, A0) and the SCL and SDA
pins together and to a 10k pull-up resistor to +V
S for better
noise immunity. Any of these pins may also be tied high sep-
arately through a 10k pull-up resistor.
1.3 I2C BUS INTERFACE
The LM75 operates as a slave on the I2C bus, so the SCL line
is an input (no clock is generated by the LM75) and the SDA
line is a bi-directional serial data path. According to I2C 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 con-
necting these pins to ground for a low, (0); or to +V
S for a high,
(1).
Therefore, the complete slave address is:
1
0
1
A2
A1
A0
MSB
LSB
9
www.national.com
LM75
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