Anyone have experience using the programmable CSS555 timer?

Datasheet: http://www.customsiliconsolutions.com/downloads/Revised%20Standard%20products/CSS555C_Spec.pdf

I picked some up for a battery operated project where I was looking for a low-power chip to accurately send a wake-up interrupt after an extended period of time.

I've been moderately pleased, though it's behavior has been a little different than I expected. Namely, when only using the internal capacitor I'm getting delay times that are 3x shorter than expected (using their equation), and when using an external capacitor I get delay times that are around 3% shorter than expected.

It's consistent at least, so it's working for me, though I'm wondering if this deviation from spec are a result of user error (likely) or if others had similar results.

This a clever device with an internal eeprom to configure it . How have you set this? To what...?

regards

Allan

5uA is not really low power and probably it is not much accurate compared to nearly any RTC option.

t_swan: Datasheet: http://www.customsiliconsolutions.com/downloads/Revised%20Standard%20products/CSS555C_Spec.pdf

I picked some up for a battery operated project where I was looking for a low-power chip to accurately send a wake-up interrupt after an extended period of time.

I've been moderately pleased, though it's behavior has been a little different than I expected. Namely, when only using the internal capacitor I'm getting delay times that are 3x shorter than expected (using their equation), and when using an external capacitor I get delay times that are around 3% shorter than expected.

It's consistent at least, so it's working for me, though I'm wondering if this deviation from spec are a result of user error (likely) or if others had similar results.

Sounds like the Vlow bit in the EEPROM is different from what you thought, or the multiplier, or both.