NXP Semiconductors Freescale FRDM-CR20A, Руководство пользователя, Страница: 15 / 24

4.3 Sc he ma tic , b oa rd la yo ut, a nd b ill o f m ate ria l
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CAD NOTE: Embed pads into 50 Ohm line.
CAD NOTE: Open Solder Mask Bottom below F-Antenna on "feedpoint" via
CAD NOTE: MISO/MOSI POKA-YOKE: Place both resistors with the same orientation and provide same airgap between MISO to MOSI resistors terminals in a square fashion.
NOTE: GPIO Signals come up (unbuffered) from the host board, from Arduino is 5V from FRDM is 3.3V
NOTE: GPIO Signals come up (unbuffered) from the host board, from Arduino is 5V from FRDM is 3.3V
NOTE: On Arduino UNO, IO_REF is 5V ON FRDM-xxxxx, IO_REF is 3.3V
CAD NOTE: R20 closed to IC to reduce the circuit trace parasiti
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NOTE: Place componentes to filtered powers for host monitoring
Forces reset down, 1 - 2 XCVR 2 - 3 Arduino/FRDM host board
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