4 MS2131 Interface Features and Design
Requirements
4.1 About This Chapter
This chapter describes the port connector specifications and usage requirements of the
MS2131. Strictly follow the specified design requirements when designing the interface
circuits of a host.
4.2 MS2131 Interface Introduction
4.2.1 USB Port and Reference Circuits
The MS2131 communicates with the host over the USB port, which supports the USB2.0
protocol. The MS2131 has the USB signals adjusted and provides build-out circuits. The host
must be able to perform impedance matching and protection. Figure 4-1 shows the reference
circuits.
Table 4-1 Signals on the USB port
Pin No. Signal Name I/O Description
1 USB_D+ I/O USB differential data signal+
2 USB_D- I/O USB differential data signal-
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