AnsweredAssumed Answered

Clarification of LPC82x power-up ramp wait time erratum

Question asked by duaneallen on Apr 13, 2018
Latest reply on Apr 24, 2018 by Jimenez

A new errata document has been published for the LPC82x (ES_LPC82x Rev 1.3). Section 3.5 VDD.1 of that document states:

 

Introduction:
On the LPC82x, the VDD supply voltage range is from 1.8 V to 3.6 V. The LPC82x
datasheet specifies a power-up ramp condition for the user application. Before ramping
up, the minimum wait time (twait) of the power supply on the VDD pin (200 mV or below) is
12 us.
Problem:
The device might not always start-up if the minimum wait time (twait) is 12 us. The required
minimum time (twait) specification is 2 ms.

 

It is unclear as to what this actually means, and what if any measures need to be taken to ensure proper startup of the microcontroller; reviewing the part's datasheet did not contribute anything that aided in understanding of the wait time requirement. Could someone provide a clearer and more detailed explanation of this, please?

 

Thanks!

Outcomes