MSP430FR6889 Datasheet, PDF (156/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers

MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
www.ti.com
7.2.3 Extended Scan Interface (ESI) Peripheral
7.2.3.1 Partial Schematic
The external connections for using the Extended Scan Interface (ESI) peripheral module depend on the
ESI operating mode and the application details. For example, using the ESI in conjunction with analog LC
sensors requires different connections than using the ESI with resistive sensors. Also, using optical
sensors and encoders that have a digital output require different considerations.
For reference implementations of using the ESI to interface with different types of sensors to perform
rotation detection, refer to the following table. These reference designs provide the hardware and software
design files as well as analysis and user’s guides to jumpstart your microcontroller-based projects.
DESIGN NAME
Gas or Water Meter With Two LC Sensors
Mechanical-to-Electronic Converter With Three LC Sensors for Gas or Water Meter
Low-Power Flow Meter Design Using Giant Magneto-Resistive (GMR) Sensors
Low-Power Flow Meter Design Using Optical Sensors
LINK
TIDM-LC-WATERMTR
TIDM-3LC-METER-CONV
TIDM-GMR-WATERMTR
TIDM-OPTICALWATERMTR
For schematic information related to other types of sensors and application use cases, refer to the
"Overview of Extended Scan Interface Applications" section in the Extended Scan Interface (ESI) chapter
of the MSP430FR58xx, MSP430FR59xx, MSP430FR68xx, and MSP430FR69xx Family User's Guide
(SLAU367).
7.2.3.2 Design Requirements
The hardware design requirements are specific to the use case and are most affected by the specification
of the interaction of the chosen analog or digital sensors with the analog front ends (AFE1 an AFE2) of the
ESI. However, when designing the sensor circuit, the other digital parts of the ESI module, namely the
preprocessing unit (PPU), the processing state machine (PSM) with its associated RAM, the timing state
machine (TSM), and the Timer_A output stage must also be considered to ensure that the processing as
required by the application can be performed in an autonomous manner inside the ESI. Refer to the
Extended Scan Interface (ESI) chapter of the MSP430FR58xx, MSP430FR59xx, MSP430FR68xx, and
MSP430FR69xx Family User's Guide (SLAU367) for additional information regarding the design
requirements and constraints of the module.
7.2.3.3 Detailed Design Procedure
TI provides a variety of collateral to aid the design and implementation of the ESI into specific applications,
most of which are related to metering. The following table gives an overview of the application notes that
are currently available. Additional application notes may be available in the device-specific product folder.
DOCUMENT TITLE
LC Sensor Rotation Detection With MSP430 Extended Scan Interface (ESI)
Method to Select the Value of LC Sensor for MSP430 Extended Scan Interface (ESI)
Adjustment of ESIOSC Oscillator Frequency
Migrating From MSP430FW42x Scan Interface to MSP430FR6x8x/FR5x8x Extended Scan Interface
LITERATURE
NO.
SLAA639
SLAA642
SLAA609
SLAA610
For complete and fully documented reference implementations that use the ESI to interface with different
types of sensors to perform rotation detection, refer to the table in Section 7.2.3.1.
156 Applications, Implementation, and Layout
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Product Folder Links: MSP430FR6889 MSP430FR68891 MSP430FR6888 MSP430FR6887 MSP430FR5889
MSP430FR58891 MSP430FR5888 MSP430FR5887