Velleman MM111 User manual

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