SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
37.1 ESI Introduction
The ESI module is used to automatically measure linear or rotational motion with the lowest possible power consumption. The ESI consists of following blocks: the analog front end (AFE1 and AFE2), the preprocessing unit (PPU), the processing state machine (PSM) with its associated RAM, the timing state machine (TSM), and the Timer_A Output Stage. The analog front end stimulates the sensors, senses the signal levels, and converts them into their digital representation. The digital representations of a measurement sequence are stored in the preprocessing unit. The stored digital signals are passed into the processing state machine. The processing state machine is used to analyze and count rotation or motion. The timing state machine controls the analog front end, the preprocessing unit, and the processing state machine. The Timer_A Output Stage generates signals that are fed into Timer_A capture inputs; this allows for time measurements (for example, LC-sensor envelope test).
The ESI features include:
- Support for different types of sensors
- LC sensors
- Resistive sensors such as Hall-effect or giant magnetoresistive (GMR) sensors
- Optical sensors
- And more
- Measurement of sensor signal envelope
- Measurement of sensor signal oscillation amplitude
- Direct analog input for analog-to-digital conversion
- Direct digital input for digital sensors such as optical decoders
- Support for quadrature decoding
Figure 37-1 shows the ESI module block diagram.
Figure 37-1 ESI Block Diagram