Texas Instruments MSP430FR58891IPMR

Overview

MSP430FR58891IPMR from Texas Instruments is an ultra-low-power 16-bit FRAM microcontroller designed for battery-operated metering and sensing applications. It integrates 128KB FRAM, 2KB RAM, a 12-bit ADC with 12 external inputs, RTC with calendar, five 16-bit timers, and an Extended Scan Interface (ESI) for capacitive sensing in water/heat meters. Operating from 1.8 V to 3.6 V, it achieves 0.35 µA RTC current in LPM3.5 mode.

For engineers reviewing the MSP430FR58891IPMR datasheet, MSP430FR58891IPMR pinout, MSP430FR58891IPMR application, or MSP430FR58891IPMR equivalent, key selection criteria include ESI peripheral support, FRAM endurance (10¹⁵ write cycles), I²C bootloader capability, and 64-pin LQFP package compatibility with industrial metering PCB layouts.

Technical Context

The MSP430FR58891IPMR implements the MSP430XV2 CPU core with unified FRAM memory space enabling simultaneous code execution and data logging without erase delays. Its clock system combines DCO, HFXT (up to 24 MHz), and LFXT (32 kHz) sources, with automatic clock gating per peripheral domain to minimize active power.

It features dual eUSCI modules: eUSCI_A supports UART/IrDA/SPI; eUSCI_B supports I²C (multi-slave addressing) and SPI. The ESI peripheral operates autonomously during LPM3, performing background capacitance measurements for fluid/gas volume detection without CPU intervention.

Key Specifications

Pinout & Package

The MSP430FR58891IPMR is housed in a 64-pin LQFP (PM) package measuring 10 mm × 10 mm with exposed thermal pad (recommended to connect to VSS). Pin functions are multiplexed across digital I/O, analog peripherals, clocks, and communication interfaces.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power FRAM microcontroller applications.

Compared with MSP430FR5889IPMR, the MSP430FR58891IPMR trades UART BSL for I²C BSL-reducing pin count overhead and simplifying isolation-but lacks no functional capability for ESI or RTC use cases. Against MSP430FR5969IPM, it omits AES and advanced ESI features, lowering BOM cost while retaining full metering functionality.

Availability

MSP430FR58891IPMR is available at Aetrix Electronics and suitable for water metering, heat cost allocation, and portable medical instrumentation requiring stable component supply, long-term lifecycle assurance, and TI-qualified industrial-grade reliability.

Supply support for MSP430FR58891IPMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The MSP430 ULP FRAM portfolio targets energy-constrained applications such as utility meters and portable sensors, combining ferroelectric memory with seven optimized low-power modes to maximize battery service life.

FAQ

What is the maximum operating frequency of the MSP430FR58891IPMR?

The MSP430FR58891IPMR supports a maximum system clock frequency of 16 MHz via its digitally controlled oscillator (DCO) or external high-frequency crystal (HFXT). This frequency is fully supported across the entire 1.8 V to 3.6 V supply range and enables real-time processing of ESI sensor data and ADC conversions without pipeline stalls. All timing specifications in the SLASE32C datasheet are validated at this rate.

Does the MSP430FR58891IPMR include hardware encryption capabilities?

No, the MSP430FR58891IPMR does not integrate AES or other cryptographic acceleration engines. It relies on software-based implementations for encryption tasks. For designs requiring hardware AES-128, TI recommends the pin-compatible MSP430FR5969IPM, which shares the same 64-pin LQFP package and FRAM capacity but adds a dedicated AES module.

How many external analog inputs does the ADC12_B module support on the MSP430FR58891IPMR?

The ADC12_B module on the MSP430FR58891IPMR supports up to 12 external analog input channels, as confirmed in Table 3-1 and Section 5.13 of the SLASE32C datasheet. These inputs are mapped to pins P1.0–P1.5, P4.0–P4.7, and P5.0–P5.7, with full programmability for sampling sequence, reference selection (internal/external), and conversion resolution.

What is the purpose of the ESI peripheral in the MSP430FR58891IPMR?

The Extended Scan Interface (ESI) in the MSP430FR58891IPMR is a dedicated hardware block for high-precision, low-power capacitive sensing. It autonomously measures capacitance changes on up to eight channels (four differential inputs + four common inputs) while the CPU remains in LPM3, enabling continuous fluid/gas volume monitoring in water and heat meters without draining the battery.

Is the MSP430FR58891IPMR pin-compatible with the MSP430FR5889IPMR?

Yes, the MSP430FR58891IPMR and MSP430FR5889IPMR share identical 64-pin LQFP (PM) packages and pin mappings, including power, ground, I/O, clock, and peripheral signal assignments. The only functional difference is the bootloader interface: MSP430FR58891IPMR uses I²C BSL (P1.6/P1.7), while MSP430FR5889IPMR uses UART BSL (P2.0/P2.1); both are electrically compatible with standard GPIO configurations.