Repository navigation
Mention of configuring high drive mode in article about connecting an LED #131
Description
Not sure this is an error... Having read the discussion at
lancaster-university/microbit-dal#456
where it was suggested that "high drive" was disabled and that it is not set anywhere in the DAL, I noticed...
https://support.microbit.org/support/solutions/articles/19000101863-connecting-an-led-to-the-micro-bit
"Each pin of the micro:bit also has a current supply limit of 5mA and a maximum of 3 pins can be configured in this high drive mode at one time.".
Also, the link in that text leads to https://hardsoft-support.kayako.com/conversation/new.
Activity
microbit-mark commentedon Dec 6, 2019
Thanks @martinwork. This statement is taken from https://tech.microbit.org/hardware/#general-purpose-inputoutput-pins
1d2d2d8#diff-206e06b1daef089df342a11027650cb3R208
which references the nrf51 data sheet
nRF51822_PS_v3.1.pdf
In Section 8.23 they note
"VOH Output high voltage (high-drive, 5 mA). 1 VDD-0.3 VDD V"
Maximum number of pins with 5 mA high drive is 3.
But perhaps this information isn't relevant if the micro:bit nrf51 is pre-configured with this mode disabled?
martinwork commentedon Dec 6, 2019
I'm sorry, I don't know. The discussion at lancaster-university/microbit-dal#456 led me to look at this page. I am reading in the hope of learning something! Hopefully that discussion will shed some light. The latest comment suggests to me that all is well except the reference to high drive, and maybe the 3 pin limit, may not be the appropriate wording.