[Elecraft] Clock Accuracy

[Dick Dievendorff]

The click chip is not directly accessible from the RS 232 interface

Dick, K6KR


Sent from my iPhone

On Jun 24, 2010, at 12:35 PM, "David Ferrington, M0XDF" <M0XDF at Alphadene.co.uk> wrote:

> so perhaps that could be added to the Utility
> 73 de M0XDF
> -- 
> A good cook is like a sorceress who dispenses happiness.
> -Elsa Schiaparelli, fashion designer (1890-1973)
> 
> On 24 Jun 2010, at 20:11, Richard Dowling wrote:
> 
>> The RTC IC has a low voltage detector which sets a bit in the seconds 
>> register.  Thus (from the IC data sheet):
>> 
>> 8.5 Voltage-low detector and clock monitor
>> The PCF8563 has an on-chip voltage-low detector. When VDD drops below Vlow the
>> VL bit (Voltage Low, bit 7 in the Seconds register) is set to 
>> indicate that reliable
>> clock/calendar information is no longer guaranteed. The VL flag can 
>> only be cleared
>> by software
>> 
>> So it's easy, just software ;-)
>> 
>> Richard
>> KL0DR
>> 
>> At 10:43 AM 6/24/2010, Brian Alsop wrote:
>>> David Ferrington, M0XDF wrote:
>>>> Regarding the battery, is there a way to check it's voltage or 
>>> projected life - without taking the cover off and measuring it?
>>>> 73 de M0XDF
>>> 
>>> Reminds me of the same suggestion implemented in a few IBM prototype
>>> PC'S for the CMOS battery.   They devised a circuit to go in and test it
>>> many times per day.  Unfortunately, the act of repeatedly testing it
>>> removed enough energy to greatly shorten battery life.
>>> 
>>> They dropped the idea.
>>> 
>>> 73 de Brian/K3KO
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