Velleman MM111 Manuale utente

USER MANUAL AUGUST 2016

MM111

ANALOG TEMPERATURE SENSOR BOARD

In addition to the analog sensor, the breakout is based on

MCP6L01T-E / LT operational amplier by Microchip. The

sensor is able to ensure a linear correlation between tem-

perature and output voltage and has a measuring accuracy

of 0.4 ° C only. The voltage output varies according to the

temperature measured by following a linear constant value

of typically 21 mV / ° C, starting from a maximum of 5 V at

-50 ° C. At a temperature of zero Celsius degrees the output

voltage is slightly higher than 1 volt.

Table 1 shows the typical output voltage values for the dif-

ferent temperatures. The component can operate with really

low input power supply voltages (from 1.5V to 5.5 volts) and

in a wide temperature range (-50 to 150 ° C).

Red Wire

+5V positive

pole to power

supply

Black Wire

GND negative

pole to power

supply

Yellow Wire

Sensor output

signal

operational LED

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The extremely low power absorption when there is no load connected to the output, 5.4 uA only, makes the inte-

grated circuit perfectly suitable for low power or battery powered boards. The board houses on its side a miniature

connector with 1.25 mm pitch for the power supply and the output signal; the PCB has been designed to offer also

2,54mm pitch holes useful to weld on them a pin-strip, to allow the breakout board connection to other boards that

could use the temperature sensor. The power line

is noise ltered by means of C1 ceramic capacitor; The C2 capacitor lters the sensor output signal, introducing so

a minimum delay (just 1 millisecond) between the temperature variation and the following output voltage. On the

power line it has been inserted the LD1 LED which, when is on, indicates if the circuit is powered and active or not.

Table 1 - Matching between measured temperature and output voltage by the integrated

circuit LMT84DCKT.

5,01 3,354,19 2,49 1,61

4,99 3,334,17 2,47 1,59

4,97 3,314,14 2,45 1,56

4,95 3,294,13 2,42 1,54

4,92 3,274,11 2,41 1,52

4,90 3,254,09 2,38 1,50

4,89 3,234,06 2,36 1,48

4,87 3,204,04 2,34 1,45

4,84 3,184,02 2,32 1,43

4,82 3,164,00 2,29 1,41

4,80 3,98 3,14 2,27 1,39

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