Texas Instruments MSP430FR68891IPZR

Overview

MSP430FR68891IPZR from Texas Instruments is a 16-bit ultra-low-power FRAM microcontroller with 128KB nonvolatile memory, 2KB RAM, integrated 12-bit ADC (16 external inputs), LCD driver (up to 320 segments), and real-time clock. It operates from 1.8 V to 3.6 V and supports seven low-power modes including LPM4.5 (0.02 µA typical), targeting battery-powered metering applications.

For engineers reviewing the MSP430FR68891IPZR datasheet, MSP430FR68891IPZR pinout, MSP430FR68891IPZR application, or MSP430FR68891IPZR equivalent, key selection criteria include FRAM endurance (10¹⁵ write cycles), RTC + calendar support, capacitive touch I/O on all ports P1–P10/PJ, and dual eUSCI modules supporting UART/IrDA/SPI/I²C with hardware bootloader.

Technical Context

The MSP430FR68891IPZR implements the MSP430 CPUXV2 core with 16 registers and integrates a flexible clock system featuring DCO (10 factory-trimmed frequencies), LFXT (32-kHz crystal), HFXT, and VLO. Its power architecture enables sub-µA standby (LPM3: 0.4 µA) and RTC operation (LPM3.5: 0.35 µA) using an external 3.7-pF crystal.

Peripherals include three 16-bit Timer_A modules (TA0/TA1/TA3), two Timer_B modules (TB0/TB1), 32-bit hardware multiplier, three-channel DMA, CRC16/CRC32 engines, and dual eUSCI_A (UART/IrDA/SPI) and eUSCI_B (I²C/SPI) interfaces - all accessible via multiplexed I/O pins with programmable pullup/pulldown and edge-selectable wakeup.

Key Specifications

Pinout & Package

LQFP-100 package (14 mm × 14 mm) with exposed thermal pad; 100-pin surface-mount footprint compliant with JEDEC MO-137.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR6879IPZ and MSP430FR68791IPN, the MSP430FR68891IPZR offers identical FRAM capacity and ultra-low-power performance but is distinguished by its I²C-based BSL and 100-pin LQFP package optimized for maximum LCD segment count and I/O flexibility in utility metering.

Availability

MSP430FR68891IPZR is available at Aetrix Electronics and suitable for water metering, heat cost allocation, and portable medical metering requiring stable component supply, long-term lifecycle assurance, and TI-qualified FRAM reliability.

Supply support for MSP430FR68891IPZR 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 applications.

The MSP430 ULP FRAM portfolio targets energy-constrained systems such as utility meters and portable instrumentation, combining ferroelectric memory with a holistic low-power architecture to maximize battery life without sacrificing performance.

FAQ

What is the maximum operating frequency of the MSP430FR68891IPZR?

The MSP430FR68891IPZR supports a maximum system clock frequency of 16 MHz via its digitally controlled oscillator (DCO) with 10 factory-trimmed frequencies. This allows deterministic real-time execution while maintaining ultra-low-power operation across all active and low-power modes. The MSP430FR68891IPZR achieves this performance without external crystals in many configurations, though HFXT and LFXT options are available for precision timing.

Does the MSP430FR68891IPZR support capacitive touch sensing on all I/O ports?

Yes, the MSP430FR68891IPZR supports capacitive touch sensing on all I/O ports - P1 through P10 and PJ - without requiring external components. This capability is implemented in hardware via the built-in capacitive touch I/O module, enabling robust, low-power human interface design for sealed enclosures in utility and medical applications. The MSP430FR68891IPZR leverages this feature to replace mechanical buttons in battery-operated meters.

What type of bootloader does the MSP430FR68891IPZR include, and how is it accessed?

The MSP430FR68891IPZR includes a hardware UART- or I²C-based bootloader (BSL) that resides in ROM and is activated via specific pin states at power-on reset. For I²C BSL operation, P1.6 (BSLSDA) and P1.7 (BSLSCL) are used; no external circuitry is needed. This enables secure, field-upgradable firmware without requiring JTAG access. The MSP430FR68891IPZR's BSL supports password protection and memory verification to ensure integrity during updates.

How does the FRAM memory in the MSP430FR68891IPZR differ from traditional flash in terms of endurance and write speed?

The MSP430FR68891IPZR's 128KB FRAM offers 10¹⁵ write cycles - orders of magnitude higher than typical flash (10⁴–10⁵ cycles) - and performs writes at 125 ns per word (64KB in 4 ms), with no erase-before-write requirement. This eliminates wear leveling and page management overhead. The MSP430FR68891IPZR uses FRAM for both code and data, enabling true unified memory architecture ideal for frequent data logging and firmware updates.

What LCD configurations does the MSP430FR68891IPZR support, and what is the maximum segment count?

The MSP430FR68891IPZR integrates the LCD_C peripheral supporting static, 2-, 3-, 4-, 6-, or 8-mux LCD displays with up to 320 segments. It provides programmable contrast control, charge pump regulation, and independent segment/common drive capability. The MSP430FR68891IPZR achieves this using dedicated pins (P6.x, P2.x, etc.) and internal voltage dividers - eliminating need for external bias generators in most utility meter displays.