Freescale Freedom Development Board FRDM-CR20A User’s Guide, Rev. 0, 04/2015
Freescale Semiconductor, Inc.
21
PCB manufacturing specifications
•
The PCB manufacturer’s logo is required
•
The PCB production week and year code is required
— The manufacturer’s logo and week/year code must be stamped on the back of the PCB solder
mask
— The PCB manufacturer cannot insert text on the PCB either in copper or in silkscreen without
written permission from Freescale Semiconductor, Inc.
•
The required Underwriter’s Laboratory (UL) Flammability Rating
— The level is 94V-0 (
www.ul.com/plastics/flame.html
)
— The UL information must be stamped on the back of the PCB solder mask
NOTE
•
A complete set of design files is available for the MCR20AVHM
transceiver at the Freescale website (
freescale.com/MCR20A
) under the
“Software and Tools.” These reference designs should be used as a
starting point for a custom application.
•
The
Application Note (AN5003)
is also available at the same web site to
provide additional design guidance
•
The
Freescale IEEE 802.15.4 / ZigBee Package and Hardware Layout
Considerations Reference Manual
, (ZHDCRM) is also available at the
same web site to provide additional design guidance.
5.1
Single PCB construction
This section describes individual PCB construction details.
•
The FRDM-CR20A PCBs are two-layer, multi layer designs
•
The PCBs contain no blind, buried, or micro vias
•
PCB data:
— FRDM-CR20A size: Approximately 73x 53mm (2.88 x 2.10 inches)
— FRDM-CR20A final thickness (Cu/Cu): 1.57 mm (0.62 inches) +/- 10% (excluding solder
mask)
Table 6
defines some of the layers of the completed PCB. The artwork identification refers to the name of
the layer in commonly used terms.
Table 6. MCR20AVHM Layer by Layer Overview
Layer
Artwork Identification
File Name
1
Silkscreen Top
PSS.art
2
Top Layer Metal
L1_PS.art
3
Bottom Layer Metal
L2_SS.art
4
Silkscreen Bottom
SSS.art
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