
Electrical characteristics
STR91xFAx32 STR91xFAx42 STR91xFAx44
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7.7.3
RTC oscillator electrical characteristics
V
DDQ
= 2.7 - 3.6V, V
DD
= 1.65 - 2V, T
A
= -40 / 85 °C unless otherwise specified.
Table 20.
Table 21.
RTC oscillator electrical characteristics
Symbol
Parameter
Test
Conditions
Value
Unit
Min
Typ
Max
g
M(RTC)
t
STUP(RTC)
Oscillator Start-up Time
(1)
Oscillator Start _voltage
(1)
1.
Data based on bench measurements, not tested in production.
V
DD_LVD+
(2)
2.
Refer to
Table 15
for min. value of V
DD_LVD+
V
V
DD
stable
1
S
RTC crystal electrical characteristics
Symbol
Parameter
Value
Unit
Min
Typ
Max
f
O
Resonant frequency
32.768
kHz
R
S
Series resistance
40
k
C
L
Load capacitance
8
pF