Datasheet

R8C/L35C Group, R8C/L36C Group, R8C/L38C Group, R8C/L3AC Group 5. Electrical Characteristics
R01DS0095EJ0101 Rev.1.01 Page 53 of 72
Apr 15, 2011
Notes:
1. Time until the voltage monitor 2 interrupt request is generated after the voltage passes V
det2.
2. Necessary time until the voltage detection circuit operates after setting to 1 again after setting the VCA27 bit in the VCA2
register to 0.
Note:
1. To use the power-on reset function, enable voltage monitor 0 reset by setting the LVDAS bit in the OFS register to 0.
Figure 5.3 Power-on Reset Circuit Characteristics
Table 5.10 Voltage Detection 2 Circuit Characteristics
(V
CC = 1.8 to 5.5 V and Topr = −20 to 85°C (N version) / −40 to 85°C (D version), unless
otherwise specified.)
Symbol Parameter Condition
Standard
Unit
Min. Typ. Max.
V
det2
Voltage detection level Vdet2_0
At the falling of VCC
3.70 4.00 4.30 V
— Hysteresis width at the rising of Vcc in voltage detection
2 circuit
—0.10— V
—
Voltage detection 2 circuit response time
(1)
At the falling of Vcc from
5 V to (Vdet2_0
− 0.1) V
— 20 150
µs
— Voltage detection circuit self power consumption VCA27 = 1, V
CC = 5.0 V — 1.7 — µA
t
d(E-A) Waiting time until voltage detection circuit operation
starts
(2)
— — 100 µs
Table 5.11 Power-on Reset Circuit Characteristics
(1)
(T opr = − 20 to 85 ° C (N version) / − 40 to 85 ° C (D version), unless otherwise specified.)
Symbol Parameter Condition
Standard
Unit
Min. Typ. Max.
t
rth External power VCC rise gradient 0 — 50000 mV/msec
Notes:
1. V
det0 indicates the voltage detection level of the voltage detection 0 circuit. Refer to 6. Voltage Detection
Circuit in the User’s Manual: Hardware for details.
2. t
w(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
t
w(por) for 1 ms or more.
Vdet0
(1)
0.5 V
Internal
reset signal
t
w(por)
(2)
Voltage detection 0
circuit response time
V
det0
(1)
1
f
OCO-S
× 32
1
f
OCO-S
× 32
External
Power V
CC
trth
trth