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STA8089FG Datasheet(PDF) 27 Page - STMicroelectronics

Part # STA8089FG
Description  Fully integrated GPS/Galileo/GLONASS/BeiDou/QZSS receiver with embedded RF and in-package Flash
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA8089FG Datasheet(HTML) 27 Page - STMicroelectronics

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STA8089FG
Electrical characteristics
33
Figure 4. 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.
4.8.3
OSCI oscillator specifications
The supported values of the embedded BOOT ROM are 16.368 MHz, 24.00 MHz,
26.00 MHz and 48.00 MHz.
The default values supported by the GNSS binary image is 26MHz and 48MHz, to enable
USB peripheral the 48 MHz is mandatory.
4.8.4
ADC specifications
This section gives the AC specification of the 10 bit Successive Approximation Register
ADC embedded in STA8089FG device. It is controlled by the ARM9 MCU through a
wrapper and an APB bridge as depicted in Figure 5 and it has a maximum conversion rate
of 1MSPS with 8 muxed analog input channels capability. An internal voltage reference is
used and analog/digital power supplies connections are implemented inside the device
without any needs of dedicated external pins.
Table 23. Characteristics of external slow clock input
Symbol
Parameter
Min.
Typ.
Max.
Unit
TJIT (cc)
Cycle-to-cycle jitter
-70
70
ps
TJIT (per)
Period jitter
-70
70
ps
Variation
-500
500
ppm
TDUTY
Duty cycle
45
55
%
CL = 18 pF
CL = 18 pF
32.768 kHz
Crystal
RTC_XTII
RCT_XTO
Device


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