Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Level 1
Level 1

I am using the cy14b064 as an RTC, i have a 3VDC lithium coin cell powering the device when main power is removed. VCC is 3.3VDC

I have seen that occasionally on connection of main power the the 32.768Khz oscillator stop for up to 20 seconds and then restarts

Has this behavior ever been reported by anyone else?


1 Reply
25 solutions authored 50 replies posted 10 solutions authored

Hi Richard,

This behavior is not reported by anyone else. Please clarify the following.

1- What is the mechanism to measure 20-sec oscillator stop? - probing Xin/Xout pin or observing time lag in the RTC time update?

2- C1 (C65) value in the above schematic shows 18 pf, which is 6 pF higher than the datasheet recommended value (12 pF). If this mismatch exists on the PC board as well, then please change the C1 value to 12 pf and retest. C1 and C2 loads across the RTC crystal are very sensitive for clock accuracy and sustained oscillation.

3- If possible please capture all 16 RTC registers value when failing.