Texas Instruments MSP430F5257IRGCT

Overview

MSP430F5257IRGCT from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller designed as an "always-on" system controller for portable and battery-powered applications. It features 128 KB flash, 16 KB RAM, dual-supply operation (DVCC: 1.8–3.6 V; DVIO: 1.62–1.98 V), 35 general-purpose I/Os with 16 external interrupts, and four USCI_A + four USCI_B modules supporting UART/IrDA/SPI/I²C. It serves in sensor hub and power-management roles where fast wake-up (<3.5 µs) and sub-µA standby current (1.6 µA LPM3) are critical.

For engineers reviewing the MSP430F5257IRGCT datasheet, MSP430F5257IRGCT pinout, MSP430F5257IRGCT application, or MSP430F5257IRGCT equivalent, key selection criteria include split-rail I/O compatibility (1.8-V DVIO rail), integrated RTC with alarm, hardware multiplier, 10-bit ADC with internal reference, and support for up to eight concurrent serial interfaces across four USCI_A and four USCI_B modules.

Technical Context

The MSP430F5257IRGCT implements a unified clock system with FLL stabilization, low-frequency VLO and trimmed REFO internal sources, 32-kHz XT1 crystal support, and up to 32-MHz XT2 capability. Its power management includes a programmable LDO core regulator, supply voltage supervision (SVS/SVM), and brownout reset - all enabling robust operation across wide input voltage ranges.

It integrates four 16-bit timers (TA0/TA1/TA2/TB0), a 10-bit 200-ksps ADC with 12 channels (10 external + 2 internal), comparator_B with 8 channels, 3-channel DMA, and a basic timer with RTC functionality. All peripherals operate under flexible low-power mode control with full RAM retention down to LPM4.5 (0.18 µA).

Key Specifications

Pinout & Package

VQFN-64 (RGC) package, 9 mm × 9 mm body size, thermally enhanced with exposed thermal pad. Pin mapping supports split-rail I/O: DVIO-supplied pins (P1–P4, P7, PJ) enable direct 1.8-V interface to application processors without level shifters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F5259IRGCT, the MSP430F5257IRGCT trades RAM capacity for cost-sensitive deployments, while compared with MSP430F5257IZXHT, it offers easier assembly and thermal management in VQFN-64 - both retain identical peripheral sets, split-rail I/O, and ultra-low-power behavior.

Availability

MSP430F5257IRGCT is available at Aetrix Electronics and suitable for sensor hub controllers, power-management hubs, and Bluetooth® system controllers requiring stable component supply, long-term lifecycle assurance, and TI-qualified production traceability.

Supply support for MSP430F5257IRGCT 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 company delivering analog and embedded processing solutions, with leadership in ultra-low-power microcontrollers since the MSP430 launch in 1998.

The MSP430F525x product line was engineered specifically for "always-on" system controller applications, emphasizing split-rail I/O compatibility, sub-microamp standby, and hardware-accelerated sensor interfacing - extending the MSP430 legacy into modern portable and IoT edge nodes.

FAQ

What is the primary supply voltage range for MSP430F5257IRGCT?

The MSP430F5257IRGCT operates with two independent supply rails: DVCC (primary core/peripheral supply) from 1.8 V to 3.6 V, and DVIO (low-voltage I/O supply) from 1.62 V to 1.98 V. This dual-supply architecture allows the device to interface directly with 1.8-V application processors and sensors without external level shifters, while maintaining higher core voltage for performance and noise immunity. The MSP430F5257IRGCT datasheet specifies strict decoupling requirements for both rails to ensure stable operation across all low-power modes.

How many hardware serial interfaces does MSP430F5257IRGCT support?

The MSP430F5257IRGCT supports eight dedicated hardware serial interfaces: four USCI_A modules (each configurable for UART, IrDA, or SPI) and four USCI_B modules (each configurable for I²C or SPI). This enables concurrent communication with multiple sensors, displays, or companion ICs - for example, four I²C sensors and four SPI peripherals - without software bit-banging or time-sharing overhead. Each USCI instance has independent clocking, FIFOs, and interrupt vectors, and the MSP430F5257IRGCT pinout allocates dedicated pins per module to avoid signal contention.

Does MSP430F5257IRGCT include a real-time clock (RTC) module?

Yes, the MSP430F5257IRGCT integrates a full-featured RTC_A module with calendar mode, alarm interrupt, and battery-backup capability when connected to a 32-kHz watch crystal on XIN/XOUT. It operates autonomously in LPM3 with only 2.3 µA (typical) current draw at 3.0 V, retaining full timekeeping and alarm functionality while the CPU and most peripherals remain powered down. The RTC_A module supports programmable alarms, periodic interrupts, and direct integration with the device's interrupt vector table - a key enabler for the MSP430F5257IRGCT's role in time-triggered sensor polling and energy-aware scheduling.

What is the wake-up time from LPM3 standby mode for MSP430F5257IRGCT?

The MSP430F5257IRGCT wakes up from LPM3 (standby mode) in 3.5 µs (typical) to active mode with all clocks running and flash execution enabled. This fast wake-up is achieved through optimized clock gating, retained register states, and immediate FLL stabilization using the internal REFO or VLO source. The specification is measured under standard conditions (3.0 V, 25°C) and applies to wake-up triggered by any enabled interrupt source - including RTC alarm, GPIO edge, comparator output, or USCI receive event - making the MSP430F5257IRGCT highly responsive in event-driven "always-on" applications.

Can MSP430F5257IRGCT operate with internal oscillators only, without external crystals?

Yes, the MSP430F5257IRGCT can operate entirely from internal oscillators: the VLO (very-low-power low-frequency oscillator, ~10 kHz) and REFO (trimmed low-frequency reference oscillator, 32.768 kHz). These sources support all low-power modes, including LPM3 with RTC operation (REFO) and LPM4 with watchdog timing (VLO). While external crystals (XT1 for 32-kHz, XT2 for up to 32-MHz) provide higher accuracy and frequency stability, the MSP430F5257IRGCT's internal sources eliminate BOM cost and board space for crystals in applications where timing precision is secondary to ultra-low power - such as basic sensor polling or intermittent telemetry using the MSP430F5257IRGCT's built-in clock system.