DEMOKIT-LG2 Renesas Electronics America, DEMOKIT-LG2 Datasheet - Page 24

• Manufacturer Part Number: DEMOKIT-LG2
• Description: KIT DEMO 78K0 LG2 UPD78F0397
• Manufacturer: Renesas Electronics America

Specifications of DEMOKIT-LG2

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DemoKit-LG2 User’s Manual
18
Figure 9 shows a diagram of the dual-slope circuit:
The charging time of the capacitor can be calculated as follows:
R6
R6
-
-
C18
C18
(R
(R
S1
S1
1 -
1 -
R5
R5
R x C
R x C
T
T
)
)
t
t
R
R
R
R
R
R
V
V
V
V
V
V
V
V
REF
REF
VAR
VAR
T
T
V
V
C
C
DD
DD
C
C
DD
DD
C
C
t = - R x C x ln
t = - R x C x ln
= R6
= R6
= R5 + R
= R5 + R
= temperature sensor resistance
= temperature sensor resistance
= ln
= ln
= 1 - e
= 1 - e
= e
= e
= V
= V
R7
R7
DD
DD
-
-
Figure 9. Dual-Slope Circuit
T
T
1 - e
1 - e
-
-
1 -
1 -
R x C
R x C
t
t
R x C
R x C
P00 / TI000
P00 / TI000
P02
P02
P03
P03
V
V
V
V
-
-
t
t
C
C
DD
DD
1 -
1 -
R x C
R x C
78K0/LG2
78K0/LG2
t
t
V
V
V
V
C
C
DD
DD