1 Hardware Revision History

Information and design changes for all board revisions.

1.1 Identifying Product ID and Revision

There are two ways to find the revision and product identifier of the Curiosity Nano Explorer: The MPLAB® X IDE Kit Window or the sticker on the bottom of the PCB.

The Kit Window appears in MPLAB X IDE when connecting a Curiosity Nano development board to the computer. An additional page for the Curiosity Nano Explorer shows when the CNANO is plugged into the socket on the board.

The first nine digits of the serial number, listed under kit information, contain the product identifier and revision.

Tip: If closed, the Kit Window can be opened in MPLAB X IDE through the menu bar Window > Kit Window.

The same information is found on the sticker on the bottom side of the PCB. The data matrix code on the sticker contains a string with the product identifier 02-00630, revision, and serial number.

The product identifier and revision are also printed in plain text as 02-00630/rr, where "rr" represents the revision. The serial number is printed on the following line.

The string in the data matrix code has the following format:

"nnnnnnnrrsssssssss"

n = product identifier

r = revision

s = serial number

1.2 Revision 2

Revision 2 is an early adopters revision.

1.3 Revision 3

Revision 3 is the initially released board revision.

Design Changes:

  • Changed I2C pull-up values to conform to Normal (100kHz) and Fast Mode (400kHz) I2C specification:
    • R101 & R102: 4.7 kΩ to 2.7 kΩ
    • R505 & R506: 4.7 kΩ to 5.1 kΩ
  • Replaced C405 with R452, a 10 kΩ resistor to consistently boot the MTCH1030 in application mode

1.4 Revision 4

Design Changes:

  • New VBUS power MUX solution
  • Added CNANO RESET button
  • Altered resistor network for the 1x8 LED row to enable logic level reading with I/O Expander 1 (U300) and CNANO
  • INT pin for I/O Expander 1 (U300) is now connected to the CNANO socket, previously connected to a 1x1 100mil pin header footprint
  • Removed functionality for USB bridge (U506) to turn off board power. Pins made accessible as 100mil pin header footprints
  • Improved functionality for changing I²C device addresses
  • Removed capacitors in parallel with button LEDs. 10 kΩ pull-up resistor R452 connected directly to TUNE_EN pin of MTCH1030
  • Various changes to pin names in silkscreen