User`s manual

DemoKit-LG2 User’s Manual
V DD 1 - e
t REF
R REF x C
-
V
DD 1 - e
t VAR
R VAR x C
-
=
1 - e
t
REF
R REF x C
-
1 - e
t
VAR
R VAR x C
-
=
e
t
REF
R REF x C
-
e
t
VAR
R VAR x C
-
=
t
REF
R REF x C
t VAR
R VAR x C
=
t
REF
R REF
t VAR
R VAR
=
t
REF
R REF x
t
VAR
R VAR =
V
DD 1 - e
t REF
R REF x C
-
V
DD 1 - e
t VAR
R VAR x C
-
=
1 - e
t
REF
R REF x C
-
1 - e
t
VAR
R VAR x C
-
=
e
t
REF
R REF x C
-
e
t
VAR
R VAR x C
-
=
t
REF
R REF x C
t VAR
R VAR x C
=
t
REF
R REF
t VAR
R VAR
=
t
REF
R REF x
t
VAR
R VAR =
The C18 capacitor and VDD supply voltage do not influence the accuracy of the measurement. Only the
absolute value of the R
REF reference resistor has an influence, because these parameters will not change
during one measurement. The R
VAR resistor can be calculated using the RREF, tREF and tVAR values.
17