5

SCD5035 Rev J 10/22/2014

Aeroflex Plainview

FIGURE 3 – Typical Temperature Sensing Application

I = 80µA

+5V

10K



10K



+

-

+

-

Temp

T1

Temp

T5

1

5

+2V

T1

t

T5

t

One primary application for the Aeroflex PCS5035, as shown in Figure 3 below, would be to monitor the

temperature of different electronic bay areas in a Satellite, and report when any bay area has exceeded a

maximum temperature limit.

Thermistors with defined temperature characteristics are used as the sensors, and by providing a constant

stable current to the external Thermistor (Temp T1 to Temp T5), an accurate analog voltage of a specified

temperature trip point can be established. The comparator voltage reference input can be tailored to set the

trip point for the characteristic of the particular thermistor sensor used. The on-board precision 2V reference

can be used directly for voltages of 2 volts or less, or can be scaled with an external operational amplifier to

provide a voltage between 2 volts and the maximum input of 3.1V. Various temperature trip points could be

accomplished by using thermistors with different temperature characteristics.