Rev. 6.00, 08/04, page 508 of 628
Table 16.30
Power Supply Voltage Detection Circuit Characteristics (4)
Using external reference voltage and ladder resistor (VREFSEL = 1, VINTDSEL = VINTUSEL =
0)
Rated Values
Item
Symbol
Min
Typ
Max
Unit
Test
Condition
Power supply drop
detection voltage
Vint(D)
*
1
3.08
*
(Vref1
–
0.1)
3.08
*
Vref1
3.08
*
(Vref1 + 0.1)
V
LVDSEL = 0
Vref input voltage
(Vint(D))
Vref1
*
2
0.98
—
1.68
V
Vint(D)
Power supply rise
detection voltage
Vint(U)
*
1
3.33
*
(Vref2
–
0.1)
3.33
*
Vref2
3.33
*
(Vref2 + 0.1)
V
LVDSEL = 0
Vref input voltage
(Vint(U))
Vref2
*
2
0.91
—
1.55
V
Vint(U)
Reset detection
voltage 1
Vreset1
*
1
1.91
*
(Vref3
–
0.1)
1.91
*
Vref3
1.91
*
(Vref3 + 0.1)
V
LVDSEL = 0
Vref input voltage
(Vreset1)
Vref3
*
2
0.89
—
2.77
V
Vreset1
Reset detection
voltage 2
Vreset2
*
1
2.76
*
(Vref4
–
0.1)
2.76
*
Vref4
2.76
*
(Vref4 + 0.1)
V
LVDSEL = 1
Vref input voltage
(Vreset2)
Vref4
*
2
1.08
—
1.89
V
Vreset2
Notes:
1. The values of Vint(D), Vint(U), Vreset1, and Vreset2 change relative to each other.
Example:
If Vint(D) is the minimum value, Vint(U), Vreset1, and Vreset2 are also the
minimum values.
2. The Vref input voltage is calculated using the following formula.
2.7 V (= V
CC
min)
< Vint(D), Vint(U), Vreset2
< 5.5 V (= V
CC
max)
1.5 V (= RAM retention voltage)
< Vreset1
< 5.5 V (= V
CC
max)
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
Содержание H8/38024 Series
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