Datasheet

Section 22 Electrical Characteristics
Rev. 4.00 Mar. 15, 2006 Page 477 of 556
REJ09B0026-0400
22.3.6 Power-Supply-Voltage Detection Circuit Characteristics (Optional)
Table 22.20 Power-Supply-Voltage Detection Circuit Characteristics
V
SS
= 0.0 V, T
a
= –20 to +75°C (regular specifications) or T
a
= –40 to +85°C (wide-range
specifications), unless otherwise indicated.
Values
Item Symbol
Test
Condition
Min. Typ. Max. Unit
Power-supply falling detection voltage Vint (D) LVDSEL = 0 3.3 3.7 — V
Power-supply rising detection voltage Vint (U) LVDSEL = 0 — 4.0 4.5 V
Reset detection voltage 1*
1
Vreset1 LVDSEL = 0 — 2.3 2.7 V
Reset detection voltage 2*
2
Vreset2 LVDSEL = 1 3.0 3.6 4.2 V
Lower-limit voltage of LVDR operation*
3
V
LVDRmin
1.0 — — V
LVD stabilization time t
LVDON
50 — — µs
Supply current in standby mode I
STBY
LVDE = 1,
Vcc = 5.0 V,
subtimer and
WDT not used
 — 350 µA
Notes: 1. This voltage should be used when the falling and rising voltage detection function is
used.
2. Select the low-voltage reset 2 when only the low-voltage detection reset is used.
3. When the power-supply voltage (Vcc) falls below V
LVDRmin
= 1.0 V and then rises, a reset
may not occur. Therefore sufficient evaluation is required.
22.3.7 Power-On Reset Circuit Characteristics (Optional)
Table 22.21 Power-On Reset Circuit Characteristics
V
SS
= 0.0 V, T
a
= –20 to +75°C (regular specifications) or T
a
= –40 to +85°C (wide-range
specifications), unless otherwise indicated.
Values
Item Symbol
Test
Condition
Min. Typ. Max. Unit
Pull-up resistance of RES pin R
RES
100 150 — kΩ
Power-on reset start voltage* V
por
— — 100 mV
Note: * The power-supply voltage (Vcc) must fall below Vpor = 100 mV and then rise after
charge of the RES pin is removed completely. In order to remove charge of the RES
pin, it is recommended that the diode be placed in the Vcc side. If the power-supply
voltage (Vcc) rises from the point over 100 mV, a power-on reset may not occur.