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SPEAR1340 bảng dữ liệu(PDF) 136 Page - STMicroelectronics

tên linh kiện SPEAR1340
Giải thích chi tiết về linh kiện  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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SPEAR1340 bảng dữ liệu(HTML) 136 Page - STMicroelectronics

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Electrical characteristics
SPEAr1340
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Doc ID 023063 Rev 4
4.3.2
Real-time clock (RTC)
External clock generated from a crystal oscillator
Figure 8.
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 44.
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
12
25
µA/V
tSU
Startup time
Stabilized power on
RTC_VDD1V5 pin
1.5
fOSC_IN
cycles
GND
32.768 kHz
CL1
CL2
(1)
(1)
RTC_XI
RTC_XO



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