Texas Instruments lanzó recientemente el sensor de temperatura LM73/LM73-Q1 para montaje en superficie (SOT23) con interfaz 2-wire (dos hilos) indicado para aplicaciones como control de climatización en vehículos, sistemas de dirección, monitoreo en instrumentación, etc. Vea en este artículo más detalles sobre este componente.

El circuito integrado LM73-Q1 de Texas Instruments consiste en un sensor de temperatura que contiene un ADC Sigma-Delta incremental que proporciona salidas escaneadas de 11 a 14 bits con interfaz de 2 hilos (2-wire).

La compatibilidad es con los buses SMBus e I2C que pueden activarse para leer la temperatura a cualquier movimiento. La envoltura es SOT23 con la pinza mostrada en la figura 1.

 

Figura 1 - Envoltura
Figura 1 - Envoltura

 

 

En el datasheet disponible en el enlace http://www.ti.com/lit/ds/symlink/lm73-q1.pdf se puede tener más detalles sobre este componente como, por ejemplo, la función de cada uno de los pines del componente.

Mouser Electronics es uno de los distribuidores que puede suministrar este componente bastando para este propósito acceder: http://www.mouser.com/search/refine.aspx?Ntk=P_MarCom&Ntt=146110030.

El rango de temperaturas de funcionamiento del LM73/ LM73-Q1 va de -40º C a + 125º C con una precisión de +/- 1,45º C en el rango de -10º C a + 80º C y la tensión de alimentación es de 2,7 V.

En la figura 2 tenemos un circuito de aplicación.

 

Figura 2 - Aplicación
Figura 2 - Aplicación

 

 

El dispositivo tiene opciones de ajuste de resolución que permiten optimizar la precisión para una aplicación específica.

La corriente de operación es de 320 uA y en la condición de shutdown esa corriente cae a 1,5 uA, valores típicos.

En la figura 3 tenemos el diagrama funcional de este sensor de temperatura.

 

Figura 3 - Diagrama funcional
Figura 3 - Diagrama funcional

 

   

La función importante a considerar en este componente es la ALERT que indica una condición de sobre-temperatura. El punto en que esto ocurre puede ajustarse externamente.

 

 

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