R01UH0823EJ0100 Rev.1.00
Page 1806 of 1823
Jul 31, 2019
RX23W Group
51. Electrical Characteristics
Note:
These characteristics apply when noise is not superimposed on the power supply.
Note 1. When OFS1.(LVDAS, FASTSTUP) = 11b.
Note 2. When OFS1.(LVDAS, FASTSTUP) ≠ 11b.
Note 3. The minimum VCC down time indicates the time when VCC is below the minimum value of voltage detection levels V
POR
, V
det0
,
and V
det1
for the POR/LVD.
Figure 51.63
Voltage Detection Reset Timing
Table 51.52
Characteristics of Power-On Reset Circuit and Voltage Detection Circuit (2)
Conditions: 1.8 V ≤ VCC0 = VCC_USB = AVCC0 = VCC_RF = AVCC_RF ≤ 3.6 V, VSS = AVSS0 = VSS_USB = VSS_RF = 0 V,
T
a
= –40 to +85°C
Item
Symbol
Min.
Typ.
Max.
Unit
Test Conditions
Wait time after
power-on reset
cancellation
At normal startup*
t
POR
―
9.1
―
ms
During fast startup
time*
t
POR
―
1.6
―
Wait time after
voltage monitoring 0
reset cancellation
Power-on voltage
monitoring 0 reset
disabled*
t
LVD0
―
568
―
μs
Power-on voltage
monitoring 0 reset
enabled*
―
100
―
Wait time after voltage monitoring 1 reset
cancellation
t
LVD1
―
100
―
μs
Response delay time
t
det
―
―
350
μs
Minimum VCC down time*
t
VOFF
350
―
―
μs
Figure 51.63, VCC = 1.0 V or
above
Power-on reset enable time
t
W(POR)
1
―
―
ms
Figure 51.64, VCC = below
1.0 V
LVD operation stabilization time (after LVD is
enabled)
Td
(E-A)
―
―
300
μs
Hysteresis width (power-on rest (POR))
V
PORH
―
110
―
mV
Hysteresis width (voltage detection circuit:
LVD1)
V
LVH
―
70
―
mV
When Vdet1_4 is selected
―
60
―
When Vdet1_5 to Vdet1_9 is
selected
―
50
―
When Vdet1_A or Vdet1_B is
selected
―
40
―
When Vdet1_C or Vdet1_D is
selected
Internal reset signal
(active-low)
VCC
t
VOFF
t
POR
t
det
V
POR
t
det
1.0V
V
PORH