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STA8100GA Datasheet(PDF) 28 Page - STMicroelectronics

Part # STA8100GA
Description  Teseo V family automotive multi-band multi-constellation GNSS precise engine receiver
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA8100GA Datasheet(HTML) 28 Page - STMicroelectronics

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Electrical specifications
STA8100GA
28/42
DS13006 Rev 4
4.4
RTC 32.768 kHz oscillator specifications
The 32.768 kHz OSCI32 oscillator is connected between RTC_XTI (oscillator amplifier
input) and RTC_XTO (oscillator amplifier output). It also requires two external capacitors of
18 pF (a) as shown in Figure 5.
OSCI32 is disabled by default and must be enabled by setting bit28-OSCI_EN of
PRCC_BACKUP_REG0 to have 32.768 KHz oscillation when an XTAL pi-network is
connected to RTC_XTI/RTC_XTO pins.
The recommended oscillator specifications are shown in the table below:
The oscillator amplifier specifications are shown in the following table:
tFALL(1)
CMOS output fall time
with CL = 15 pF, from 10
to 90 %; 3.3 V
2 mA max. current
drive
—3
—
ns
4 mA max. current
drive
—2
—
1. Specified by design
Table 21. Electrical characteristics of digital input and output buffers (continued)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
a. Using crystal with recommended characteristics as per Table 22.
Table 22. Crystal recommended specifications
Symbol
Parameter
Min.
Typ.
Max.
Unit
FSXTAL
Crystal frequency
—
32.768
—
kHz
LMSXTAL
Motion inductance
3500
5
6500
kH
CMSXTAL
Motional capacitance
4.0
5.0
6.0
fF
COSXTAL
Shunt capacitance
1.0
1.3
1.6
pF
ESR
Resonance resistance
—
—
80
kOhm
CL
External load capacitance
—
18 + / - 2 %
—pF
External load capacitance
(frequency variation < 80 ppm)
18 + / - 2 %
Table 23. 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
uW
RLC
Required load capacitance(1)
—
12.5
—
pF
GO
Startup conductance
22.5
33.6
60
uA/V



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