L-827e.A3 phyCORE-i.MX 6UL/ULL Hardware Manual
© PHYTEC Messtecknik GmbH
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15 RTC
The i.MX 6UL processor also includes an integrated RTC. By default, the RTC is sourced by the internal 32 kHz
oscillator. To get a higher accuracy it is possible to connect an external crystal or oscillator (with 32 kHz or 32.768
kHz) to the phyCORE-i.MX 6UL SOM. The following table shows the location of the RTC_XTALI/O pins on the
phyCORE-Connector X1.
The internal oscillator is automatically multiplexed in the clocking system when the system detects a loss of clock.
Please refer to the
i.MX 6UL/ULL Reference Manual
for more information about connecting an external clock source
to the RTC.
TABLE 28: RTC XTAL Signal Location at phyCORE
‑
Connector X1
Pin #
Signal
ST
Voltage Domain
Description
140
RTC_XTALI
analog
VDD_SNVS_CAP
RTC XTALI
141
RTC_XTALO
analog
VDD_SNVS_CAP
RTC XTALO
Warning
If an external crystal is used, R146 must be removed from the phyCORE-i.MX 6UL/ULL SOM
i.MX 6UL/ULL Component Placement (top view)
Please consider that the two signals are located underneath the module beside the GND
‑
pads
i.MX 6UL/ULL Component Placement (bottom view)
)!