The USS_A module provides a high-precision ultrasonic-sensing solution. The USS_A module is a sophisticated system that consists of six submodules:

• UUPS (universal USS power supply)
• HSPLL (high-speed PLL) with oscillator
• ASQ (acquisition sequencer)
• PHY (physical interface)
• PPG_A (programmable pulse generator "A") with low output impedance driver
• PGA (programmable gain amplifier)
• SDHS (sigma-delta high-speed ADC) with DTC (data transfer controller)

The submodules have different roles, and together the enable high-precision data acquisition in ultrasonic applications. See the dedicated chapter for each submodule in the MSP430FR58xx, MSP430FR59xx, and MSP430FR6xx Family User's Guide.

The USS module performs complete measurement sequence without CPU involvement to achieve ultra-low power consumption for ultrasonic metrology. Section 7.1 shows the USS subsystem block diagram. The USS module has dedicated I/O pins without secondary functions. See the Ultrasonic Sensing Solution (USS) chapter in the MSP430FR58xx, MSP430FR59xx, and MSP430FR6xx Family User's Guide for details.

Figure 9-1 USS_A Subsystem Block Diagram