CMOS temperature sensor drives loads directly

The National LM94022 temperature sensor is a CMOS IC capable of operating from 1.5V, with the added benefit of high source- and sink-current capability enabling direct connection to external circuitry.

The Class-A/B push-pull output of the LM94022 is capable of driving ±50µA and can connect directly to devices such as sample-and-hold ADCs, which impose high transient loads. The sensor also has a low supply current of 5.4µA, which combines with low-voltage operation to enable use in battery-powered products.

The LM94022 is capable of measuring temperature over its full operating range, from -50°C to 150°C, with accuracy of ±2.7°C. Accuracy is better than ±1.5°C between 20°C and 40°C. In addition, the sensor has four selectable gain settings allowing sensitivity to be adjusted up to a maximum of -13.6mV/°C. The gain-select inputs require no pull-up or pull-down resistors, thereby saving external components. Moreover they can be driven by logic signals, which allows the host system to adjust sensitivity automatically during operation or system diagnostics.

 

FEATURES Operating voltage: 1.5V to 5V Short-circuit protected output Fully qualified to AEC-Q100 Footprint-compatible with LM20 temperature sensor Temperature sensitivity: -5.5mV/°C to -13.6mV/°C

APPLICATIONS Wireless transceivers Domestic appliances Automotive systems Battery-management circuits

 

 

National Semiconductor / LM94022