Renesas H8/38024 Hardware Manual page 538

Table 16.30 Power Supply Voltage Detection Circuit Characteristics (4)
Using external reference voltage and ladder resistor (VREFSEL = 1, VINTDSEL = VINTUSEL =
0)
Item Symbol
Vint(D) *
Power supply drop
detection voltage
Vref1 *
Vref input voltage
(Vint(D))
Vint(U) *
Power supply rise
detection voltage
Vref2 *
Vref input voltage
(Vint(U))
Vreset1 *
Reset detection
voltage 1
Vref3 *
Vref input voltage
(Vreset1)
Vreset2 *
Reset detection
voltage 2
Vref4 *
Vref input voltage
(Vreset2)
Notes: 1. The values of Vint(D), Vint(U), Vreset1, and Vreset2 change relative to each other.
Example:
2. The Vref input voltage is calculated using the following formula.
2.7 V (= V
1.5 V (= RAM retention voltage)
Vref1: 2.7 < 3.08 * (Vref1 – 0.1), 3.08 * (Vref1 + 0.1) < 5.5 → 0.98 < Vref1 < 1.68
Vref2: 2.7 < 3.33 * (Vref2 – 0.1), 3.33 * (Vref2 + 0.1) < 5.5 → 0.91 < Vref2 < 1.55
Vref3: 1.5 < 1.91 * (Vref3 – 0.1), 1.91 * (Vref3 + 0.1) < 5.5 → 0.89 < Vref3 < 2.77
Vref4: 2.7 < 2.76 * (Vref4 – 0.1), 2.76 * (Vref4 + 0.1) < 5.5 → 1.08 < Vref4 < 1.89
Rev. 6.00, 08/04, page 508 of 628
Min
1
–
3.08 * (Vref1
2
0.98
1
–
3.33 * (Vref2
2
0.91
1
–
1.91 * (Vref3
2
0.89
1
–
2.76 * (Vref4
2
1.08
If Vint(D) is the minimum value, Vint(U), Vreset1, and Vreset2 are also the
minimum values.
min)
CC
Rated Values
Typ Max
0.1) 3.08 * Vref1 3.08 * (Vref1 + 0.1)
—
1.68
0.1) 3.33 * Vref2 3.33 * (Vref2 + 0.1)
—
1.55
0.1) 1.91 * Vref3 1.91 * (Vref3 + 0.1)
—
2.77
0.1) 2.76 * Vref4 2.76 * (Vref4 + 0.1)
—
1.89
< Vint(D), Vint(U), Vreset2
< Vreset1
Test
Unit Condition
V LVDSEL = 0
V Vint(D)
V LVDSEL = 0
V Vint(U)
V LVDSEL = 0
V Vreset1
V LVDSEL = 1
V Vreset2
< 5.5 V (= V max)
CC
< 5.5 V (= V max)
CC