LPC MicrocontrollersのトピックRe: What is the LPC812 brown out detect voltage range?

What is the LPC812 brown out detect voltage range?

Larry5335 — Fri, 06 Oct 2017 14:23:18 GMT

We are using the BOD reset level 3 (assertion 2.6V) as a battery check. I had attempted to calculate the expected tolerance band on the 2.6V threshold using the internal voltage reference tolerance given in datasheet table 21. However, after measuring several units I see the BOD triggering over a much wider range of voltages than I’d expect based on this data alone (2.57-2.69V seen in a sample of 13 units).

Do you have information on the expected range of BOD voltages at 25C and over temperature (our temperature range is 5C to 40C)?

Re: What is the LPC812 brown out detect voltage range?

Carlos_Mendoza — Fri, 06 Oct 2017 16:45:37 GMT

Hi Larry,

The values in the datasheet are typical BOD levels although there is some hysteresis (minimum 0.4V).

Hope it helps!

Best Regards,
Carlos Mendoza
Technical Support Engineer

Re: What is the LPC812 brown out detect voltage range?

Larry5335 — Fri, 06 Oct 2017 17:35:37 GMT

Yes, I know the datasheet lists the typical value. I am asking for min and max values at 25C and over temperature.

Re: What is the LPC812 brown out detect voltage range?

Carlos_Mendoza — Thu, 12 Oct 2017 14:41:19 GMT

Hi Larry,

Unfortunately, we don’t have the minimum and maximum threshold values for the BOD levels.

Best Regards,
Carlos Mendoza
Technical Support Engineer

Re: What is the LPC812 brown out detect voltage range?

vojtechhavlicek — Thu, 02 Nov 2017 09:55:40 GMT

According to my opinion these values should be documented over the whole operational temperature, if you specify in datasheet that operational temperature is -40 °C to +105 °C. BOD is peripheral which can cause reset of the device...