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SPEAR320S bảng dữ liệu(PDF) 72 Page - STMicroelectronics

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SPEAR320S bảng dữ liệu(HTML) 72 Page - STMicroelectronics

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Electrical characteristics
SPEAr320S
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Doc ID 022508 Rev 2
4.6.2
Real-time clock (RTC)
RTC clock generated from a crystal oscillator
Figure 5.
RTC crystal connection
1.
CL1 and CL2 are the load capacitors.
The value of the capacitors depends on the type of the selected crystal. To calculate the
value of the load capacitance, use the formula given below.
Formula
C
L
C
L1
C
L2
×
C
L1
C
L2
+
--------------------------
C
s
+
=
Where CL1 and CL2 are the load capacitors and CS is the circuit stray capacitance.
In our application:
CL1 = CL2 = Cext
This implies:
Cext = (CL-CS)*2
Table 42.
RTC oscillator characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
fOSC_IN
Oscillator frequency
32.768
kHz
ESR
Equivalent series
resistance
6000
Ω
gm
Oscillator
transconductance
Startup
5
µA/V
tSU
Startup time
Stabilized power
on RTC_VDD1V5
pin
17000
fOSC_IN
cycles
GND
32.768 kHz
CL1
CL2
(1)
(1)
RTC_XI
RTC_XO



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