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PDF LM75CIM-5 Data sheet ( Hoja de datos )
| Número de pieza | LM75CIM-5 | |
| Descripción | Digital Temperature Sensor and Thermal WATCHDOG with Two-Wire Interface | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 2000
LM75
Digital Temperature Sensor and Thermal WATCHDOG™
with Two-Wire Interface
General Description
The LM75 is a temperature sensor, Delta-Sigma
analog-to-digital converter, and digital over-temperature de-
tector with I2C® interface. The host can query the LM75 at
any time to read temperature. The open-drain Overtempera-
ture Shutdown (O.S.) output becomes active when the tem-
perature exceeds a programmable limit. This pin can operate
in either “Comparator” or “Interrupt” mode.
The host can program both the temperature alarm threshold
(TOS) and the temperature at which the alarm condition goes
away (THYST). In addition, the host can read back the con-
tents of the LM75’s TOS and THYST registers. Three pins (A0,
A1, A2) are available for address selection. The sensor pow-
ers up in Comparator mode with default thresholds of 80˚C
TOS and 75˚C THYST.
The LM75’s 3.0V to 5.5V supply voltage range, low supply
current and I2C interface make it ideal for a wide range of ap-
plications. These include thermal management and protec-
tion applications in personal computers, electronic test
equipment, and office electronics.
Features
n SOP-8 and Mini SOP-8 (MSOP) packages save space
n I2C Bus interface
n Separate open-drain output pin operates as interrupt or
comparator/thermostat output
n Register readback capability
n Power up defaults permit stand-alone operation as
thermostat
n Shutdown mode to minimize power consumption
n Up to 8 LM75s can be connected to a single bus
Key Specifications
n Supply Voltage
n Supply Current
n Temperature Accuracy
operating
shutdown
−25˚C to 100˚C
−55˚C to 125˚C
3.0V to 5.5V
250 µA (typ)
1 mA (max)
4 µA (typ)
±2˚C(max)
±3˚C(max)
Applications
n System Thermal Management
n Personal Computers
n Office Electronics
n Electronic Test Equipment
Simplified Block Diagram
WATCHDOG™ is a trademark of National Semiconductor Corporation.
I2C® is a registered trademark of Philips Corporation.
© 2000 National Semiconductor Corporation DS012658
DS012658-1
www.national.com
1 page  
Logic Electrical Characteristics (Continued)
DS012658-5
FIGURE 2. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)
DS012658-6
FIGURE 3. Printed Circuit Board Used for Thermal Resistance Specifications
5 www.national.com
5 Page 
2.0 I2C Timing Diagrams
11 www.national.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LM75CIM-5.PDF ] | |
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