8 MS2131 PCB Design Guide
This chapter describes the PCB interconnection design requirements and precautions for the
host. Complying with these requirements and following these precautions help ensure the
performance of the MS2131 when interconnected with the host and reduce user costs.
8.1 General PCB Design Rules
To ensure the signal integrity and conductivity between the MS2131 and its peripherals,
maximize the power cable routing width. Ensure a conductivity of 2 A.
The two surfaces of USB differentiated signal must be surrounded by grounds and the
impedance must be controlled in a proper range. Do not interrupt the signal with strong
interference or sensitive signals.
8.2 Power Design
The power design is a key factor for the MS2131 performance, which has impacts on the
following specifications:
EMC performance
Radio modulation spectrum
Phase and receiving sensitivity
The general power design rules are described as follows:
Ensure a good power quality. Reduce the power ripple for a switched-mode power
supply and noise interference for a linear power supply.
Place the filter capacitors for the power supply as close to the power pins for the USB
connector as possible. Place the capacitor with less capacitance closer to the power pins.
Use capacitors of 150 μF, 4.7 μF, 10 nF, 100 pF, and 33 pF.
Try to minimize the voltage drop caused by the power cable routing and ensure a conductivity
of 2 A.
To Next Page
Loading...
