Renesas H8 Series Hardware Manual

Section 16 Electrical Characteristics
Rev. 7.00 Mar 10, 2005 page 527 of 652
REJ09B0042-0700
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

Renesas H8 Series Specifications

General

Brand	Renesas
Model	H8 Series
Category	Computer Hardware
Language	English