I have just made a new PCB with an LPC1549 - 48 on it.
Absolute minimum parts,
USB connection, P2-12, P2-13
I2C, P0-23, P0-22
Serial P0-15, P0-14
12 Mhz Crystal
And 2 LED’s
My problem is it does NOT show up as a USB Device, for programming,
ISP-0 Low & ISP-1 Hi, and a negative going pulse on reset,
with reset low, my board takes about 4mA
When Hi around 9mA
I have made several other PCB designs, with USB enabled chips,
And they have worked OK.
Is there something I am missing, I have searched the data sheet for … you must …
or other Gothcers !!!
I can not see anything in the Espresso board that is relay different,
Other than I am using a 48 pin part not 64 pin part.
I am confident most of the board works, because I can enter serial ISP, and send “?”
“Synchronized” back !!
But of course, using my work PC , I cannot install Flash Magic, or Bin2Hex
Only ‘APPROVED’ software is permitted
Any one has any suggestions,
I would appreciate it,