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STA8090GA датащи(PDF) 25 Page - STMicroelectronics

номер детали STA8090GA
подробное описание детали  Automotive GPS/Galileo/GLONASS/BeiDou/QZSS receiver
PDF  32 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA8090GA датащи(HTML) 25 Page - STMicroelectronics

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STA8090GA
Electrical characteristics
31
The recommended oscillator specifications are shown in Table 21:
The oscillator amplifier specifications are shown in the following table:
Figure 3. 32.768 kHz crystal connection
To drive the 32.768 kHz crystal pins from an external clock source:
Disable the oscillator (bit28-OSCI_EN = 0b in PRCC_BACKUP_REG0 register). This
disables the internal inverter, thus reducing the power consumption to minimum.
Drive the RTC_XTI pin with a square signal or a sine wave.
Table 21. Crystal recommended specifications
Symbol
Parameter
Min.
Typ.
Max.
Unit
FSXTAL
Crystal frequency(1)
1. Not tested in production.
—
32.768
—
kHz
LMSXTAL
Motion inductance(1)
—5
—
kH
CMSXTAL
Motional capacitance(1)
—5.0
—
fF
COSXTAL
Shunt capacitance(1)
—1.3
—
pF
ESR
Resonance resistance(1)
——
80
kΩ
CL
External load capacitance(1)
—18
—
pF
Table 22. Oscillator amplifier specifications
Symbol
Parameter
Min.
Typ.
Max.
Unit
TS
Startup time(1)
1. Not tested in production.
—0.3
0.6
s
DL
Drive level(1)
——
<0.1
µW
RLC
Required load capacitance(1)
—
12.5
—
pF
GM
Startup transconductance
22.5
33.6
—
µA/V
CL = 18 pF
CL = 18 pF
32.768 kHz
Crystal
RTC_XTII
RCT_XTO
Device



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