Datasheet

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Rev. 8.00 Mar. 09, 2010 Page 445 of 658
REJ09B0042-0800
Resistance Value Calculation Table
Ex. No Vref (V) R (kΩ) Vreset1 Vint(D) Vint(U) R1 (kΩ) R2 (kΩ) R3 (kΩ)
1 1.30 1000 2.5 2.7 2.9 517 33 450
2 1.41 1000 2.7 2.9 3 514 16 470
3 1.57 1000 3 3.2 3.5 511 42 447
4 2.09 1000 4 4.5 4.7 536 20 444
4. Using an error calculation table like the one shown below, plug in values for R1, R2, R3, and
Vref to calculate the deviation of Vreset1, Vint(D), and Vint(U). Make sure to double check
the maximum and minimum values for each value.
Error Calculation Table
Resistance Value
Error (%)
Vref (V)
R1
(kΩ)
R2
(kΩ)
R3
(kΩ)
5
Comparator
Error (V)
Vreset1
(V)
Vint(D)
(V)
V
int(U)
(V)
1.3 517 33 450 R1+Err, R2/R3-Err 0.1 2.59 2.94 3.15
0 2.49 2.84 3.05
-0.1 2.39 2.74 2.95
R1-Err, R2/R3+Err 0.1 2.59 2.66 2.85
0 2.49 2.56 2.75
-0.1 2.39 2.46 2.65
R1/R2/R3 No Err 0.1 2.59 2.79 2.99
0 2.49 2.69 2.89
-0.1 2.39 2.59 2.79
R1/R2+Err, R3-Err 0.1 2.59 2.93 3.16
0 2.49 2.83 3.06
-0.1 2.39 2.73 2.96
R1/R2-Err, R3+Err 0.1 2.59 2.67 2.84
0 2.49 2.57 2.74
-0.1 2.39 2.47 2.64