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LM75BD118

I2C temp sensor, 11-bit 0.125C, OS output, 2.8-5.5V, SOIC-8, pin-compatible LM75

13200

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Pieza del fabricante：

LM75BD118

Paquete：

SOIC-8 (3.90 x 4.90 x 1.35 mm)

Marca：
Categorías de productos：
Compromiso de calidad
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Descripción

Productos

The LM75BD,118 from NXP Semiconductors is a digital temperature sensor with I2C interface in an SOIC-8 package. It provides 11-bit temperature resolution (0.125°C) with an open-drain overtemperature shutdown output (OS), operating from 2.8 V to 5.5 V over a -55°C to +125°C range.

Especificaciones

Temperature Resolution 11-bit (0.125°C)
Temperature Accuracy +/-2°C (-25°C to +100°C), +/-3°C (-55°C to +125°C)
Interface I2C (up to 400 kHz, 8 devices on bus)
Tensión de alimentación 2.8 V to 5.5 V
Shutdown Current 1.0 uA typical
OS Output Open-drain, programmable threshold
Temperature Range -55°C to +125°C
Default T_OS 80°C
Default T_HYST 75°C

Características

  • Pin-to-pin replacement for industry-standard LM75/LM75A with improved 0.125°C resolution
  • Three address pins allow up to 8 devices on one I2C bus
  • Programmable overtemperature shutdown and hysteresis setpoints
  • OS output configurable as comparator or interrupt mode
  • Power-up defaults enable standalone thermostat operation
  • I2C bus timeout prevents bus hang-up
  • Shutdown mode reduces supply current to 1.0 uA

Aplicaciones

  • System thermal management in PCs and servers
  • Industrial controllers and electronic equipment
  • Battery-powered temperature monitoring
  • Hard disk drive temperature protection

The LM75BD,118 from NXP Semiconductors is a temperature-to-digital converter that uses an on-chip bandgap temperature sensor and Sigma-Delta A/D conversion technique with an overtemperature detection output. It is a pin-to-pin replacement for the industry-standard LM75 and LM75A, offering improved temperature resolution of 0.125°C through an 11-bit ADC compared to the 9-bit resolution of the original LM75. The device communicates via a 2-wire I2C bus interface supporting up to 400 kHz clock frequency, with three address pins allowing up to eight devices on the same bus without address conflicts. The open-drain OS output can be configured in comparator or interrupt mode with programmable active state, and a programmable fault queue prevents false triggering. Upon power-up, the device defaults to comparator mode with an overtemperature threshold of 80°C and hysteresis of 75°C, enabling standalone thermostat operation without any I2C communication. The shutdown mode reduces supply current to just 1.0 uA for battery-powered applications.

The LM75BD,118 operates through three functional blocks: (1) The temperature sensor uses a bandgap circuit whose output voltage varies proportionally with temperature. This voltage is digitized by a Sigma-Delta ADC that produces an 11-bit two’s complement result with 0.125°C resolution. The conversion is performed continuously at approximately 10 samples per second in normal mode, and the result is always available in the temperature register. (2) The I2C interface allows a host controller to read the temperature register and configure the device through a set of registers: Configuration register for mode and OS settings, T_OS register for the overtemperature shutdown threshold, and T_HYST register for the hysteresis value. The I2C section operates independently from the ADC, allowing reads without interrupting conversions. A bus timeout feature resets the interface if SCL is held low for more than 30 ms, preventing bus lockup. (3) The OS output is an open-drain comparator that activates when the temperature exceeds T_OS and deactivates when it falls below T_HYST. In comparator mode, OS follows the temperature directly; in interrupt mode, OS latches active until cleared by reading the temperature register.

Pin No. Nombre de la clavija Función
1 SDA I2C serial data (bidirectional)
2 SCL I2C serial clock (input)
3 OS Overtemperature shutdown output (open-drain)
4 GND Suelo
5 A2 I2C address bit 2 (input)
6 A1 I2C address bit 1 (input)
7 A0 I2C address bit 0 (input)
8 V+ Supply voltage (2.8-5.5 V)
  • PC and server thermal management where multiple LM75BD devices on a single I2C bus monitor temperatures at different board locations with the OS output triggering fan speed control or thermal shutdown
  • Industrial controllers using the power-up default thermostat mode (80°C/75°C) for standalone overtemperature protection without requiring I2C communication
  • Battery-powered environmental monitoring where the 1 uA shutdown current preserves battery life and 0.125°C resolution enables precise thermal drift tracking
  • Hard disk drive temperature protection leveraging the fault queue to prevent false OS triggers from transient thermal events
Modelo Marca Resolution Interface Paquete
LM75BDP NXP 11-bit I2C TSSOP-8
LM75CIM-5 TI 9-bit I2C SOIC-8
DS75S+ Maxim 12-bit I2C SOIC-8
ADT75BRZ ADI 12-bit I2C MSOP-8
MCP9808T-E/MS Microchip 13-bit I2C MSOP-8
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