78K0/Fx2 – CAN it!
The temperature at the sensor can be calculated from the change in the sensors resistance from the
following equation, which approximates the characteristic curve:
α
² - 4 x
β
+ 4 x
β
x k
T
-
α
T =
25 +
° C
2 x
β
-3
α
= 7,88 x 10 x K
β
= 1,937 x 10 x K
k
T
=
-1
-5
-2
R
T
R
25
with:
α
² - 4 x
β
+ 4 x
β
x k
T
-
α
T =
25 +
° C
2 x
β
-3
α
= 7,88 x 10 x K
β
= 1,937 x 10 x K
k
T
=
-1
-5
-2
R
T
R
25
-3
α
= 7,88 x 10 x K
β
= 1,937 x 10 x K
k
T
=
-1
-5
-2
R
T
R
25
with:
3.13 External LED’s D1–D4
LED’s D1 to D4 are connected to port P5 of the 78K0/FF2 device. A low signal output at each port
switches the corresponding LED on.
LED
Port 78K0/FF2
D1 P50
D2 P51
D3 P52
D4 P53
Table 12: LED D1–D4 connection
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