
R8C/3GM Group
33. Electrical Characteristics
R01UH0284EJ0100 Rev.1.00
Aug 09, 2011
Notes:
1.
The measurement condition is VCC = 1.8 V to 5.5 V and Topr =
20 to 85°C (N version).
2.
The voltage detection level varies with detection targets. Select the level with the VCA24 bit in the VCA2 register.
3.
Time until the voltage monitor 2 interrupt request is generated after the voltage passes Vdet2.
4.
Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2
register to 0.
Notes:
1.
The measurement condition is Topr =
20 to 85°C (N version), unless otherwise specified.
2.
To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0.
Figure 33.3
Power-on Reset Circuit Electrical Characteristics
Table 33.11
Voltage Detection 2 Circuit Electrical Characteristics
Symbol
Parameter
Condition
Standard
Unit
Min.
Typ.
Max.
Vdet2
Voltage detection level Vdet2_0
(2)At the falling of VCC
3.70
4.00
4.30
V
Voltage detection level Vdet2_EXT
(2)At the falling of LVCMP2
1.20
1.34
1.48
V
Hysteresis width at the rising of Vcc in voltage detection
2 circuit
0.10
V
Voltage detection 2 circuit response time
(3)At the falling of Vcc from
5 V to (Vdet2_0
0.1) V
20
150
s
Voltage detection circuit self power consumption
VCA27 = 1, VCC = 5.0 V
1.7
A
td(E-A)
Waiting time until voltage detection circuit operation
100
s
Table 33.12
Power-on Reset Circuit (2) Symbol
Parameter
Condition
Standard
Unit
Min.
Typ.
Max.
trth
External power VCC rise gradient
0
50,000
mV/ms
Notes:
1. Vdet0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection
Circuit for details.
2. tw(por) indicates the duration the external power VCC must be held below the valid voltage (0.5 V) to enable
a power-on reset. When turning on the power after it falls with voltage monitor 0 reset disabled, maintain
tw(por) for 1 ms or more.
Vdet0 (1)
0.5 V
Internal
reset signal
tw(por) (2)
Voltage detection 0
circuit response time
Vdet0 (1)
1
fOCO-S
× 32
1
fOCO-S
× 32
External
Power VCC
trth