·If there are some digital storage unit, such as SIM card, SD card, Flash and so on, these
components and the Peripheral device must be shielded，and keep 10mm away from the side
of the MS2131.
·If there are some Communication FPC boards，such as the LCD，the Touch，the MIC，
and the SPK+， the FPC board suggest doing EMI processing，and the FPC cables should not
be placed near the MS2131.
·If there are some fast switching c ircuit, such as DCDC circuit, PMU power management
circuit, and other circuit that can produce a large electric current ，they must be shielded， and
keep 10mm away from the side of the MS2131.
·If there are some clock circuit, such as the TCXO circuit，they must be shielded， and
keep 10mm away from the side of the MS2131.
·If there are other baseband signal processing circuit or control circuit, they must be
shielded，and keep 10mm away from the side of the MS2131.
·If there are other RF communication unit, such as WIFI,BT, GPS,NFC and so on, they
must be shielded， and keep 10mm away from the side of the MS2131.
·Some test points for high speed digital signal should be placed far away from the MS2131
about 5mm.
In addition, other components or circuit which can produce strong EMI should be shielded
and placed far away from the MS2131.
We have given some design rules above for customers to solve the strong interference. If the customers
are unable to meet the design rules, it may decrease the MS2131 performance even the MS2131 cannot
work normally.
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