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 +- 5ppm across -40 to 85C.  This is /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):
  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.

Revision as of 10:56, 13 February 2017

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

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