TS-4900 RTC: Difference between revisions

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We include the Intersil ISL12020 RTC onboard.  This provides an exceptionally long RTC battery life, as well as a built in temperature sensor to provide +- 5ppm across -40 to 85C.  This is accessed using /dev/rtc0 in our images, and is accessed using the standard [http://linux.die.net/man/8/hwclock hwclock] command.
We include the Intersil ISL12020 RTC onboard.  This provides a long RTC battery life, as well as a built in temperature sensor to provide ±5 ppm across -40 to 85 C.  The RTC appears at "/dev/rtc0" in our images, and is accessed using the standard [http://linux.die.net/man/8/hwclock hwclock] command.
 
This RTC driver is also capable of warning when the RTC voltage begins to drop near its end of life.  These messages can be seen in the kernel log (dmesg) with these messages:
  rtc-isl12022 1-006f: voltage dropped below 85%, date and time is not reliable.
  rtc-isl12022 1-006f: voltage dropped below 75%, date and time is not reliable.

Latest revision as of 14:36, 6 March 2019

We include the Intersil ISL12020 RTC onboard. This provides a long RTC battery life, as well as a built in temperature sensor to provide ±5 ppm across -40 to 85 C. The RTC appears at "/dev/rtc0" in our images, and is accessed using the standard hwclock command.

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