Datasheet

Section 23 Electrical Characteristics
Rev.5.00 Nov. 02, 2005 Page 409 of 500
REJ09B0027-0500
23.2.8 Power-Supply-Voltage Detection Circuit Characteristics (Optional)
Table 23.10 Power-Supply-Voltage Detection Circuit Characteristics
V
SS
= 0.0 V, T
a
= –20 to +75°C, 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
Current consumption in standby
mode
I
STBY
LVDE = 1,
Vcc = 5.0 V,
When a 32-kHz
crystal resonator
is 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.
23.2.9 Power-On Reset Circuit Characteristics (Optional)
Table 23.11 Power-On Reset Circuit Characteristics
V
SS
= 0.0 V, T
a
= –20 to +75°C, 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.