LOW-POWER VOLTAGE OUTPUT TEMPERATURE SENSOR

DESCRIPTION

The UTC UTS2301 low-cost, low-power and tiny temperature

sensor family converts temperature to an analog voltage. It provides

an accuracy of ±4°C from 0°C to +70°C while consuming 6µA (typ.)

of operating current.

The UTC UTS2301 provides a low-cost solution for applications

that require measurement of a relative change of temperature. When

measuring relative change in temperature from 25°C, an accuracy of

±1°C (typ.) (VDD=5V) can be realized from 0°C to 70°C. This

accuracy can also be achieved by applying system calibration at

25°C.

Unlike resistive sensors such as thermistors, this family does not

require a signal conditioning circuit. The voltage output pin can be

directly connected to an ADC input of a microcontroller. The UTC

UTS2301 temperature coefficient is scaled to provide a 1° C/bit

resolution for an 8-bit ADC with a reference voltage of 2.5V and 5V,

respectively.

In addition, It is immune to the effects of parasitic capacitance

and can drive large capacitive loads. This provides Printed Circuit

Board (PCB) layout design flexibility by enabling the device to be

remotely located from the microcontroller. Adding some capacitance

at the output also helps the output transient response by reducing

overshoots or undershoots. However, capacitive load is not required

for sensor output stability.

The UTC UTS2301 low operating current of 6μA (typ.) makes it

ideal for battery-powered applications. However, for applications that

require tighter current budget, this device can be powered using a

microcontroller Input/Output (I/O) pin. The l/O pin can be toggled to

shutdown the device. In such applications, the microcontroller

internal digital switching noise is emitted to the UTC UTS2301 as

power supply noise. This switching noise compromises

measurement accuracy. Therefore, a decoupling capacitor will be

necessary.

FEATURES

* Tiny Analog Temperature Sensor

* Wide Temperature Measurement Range: -10°C ~ +125°C

* Accuracy: ±4°C (max.), 0°C ~ +70°C

* Optimized for Analog-to-Digital Converters (ADCs): 19.5mV/°C (typ.)

* Wide Operating Voltage Range: VDD = 3.1V~ 5.5V

* Low Operating Current: 6 µA (typ.)

* Optimized to Drive Large Capacitive Loads