Texas Instruments MSP430F4784IPZ

Overview

MSP430F4784IPZ from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller designed for single-phase electricity metering. It integrates four 16-bit sigma-delta ADCs with differential PGA inputs, 48KB+256B flash/2KB RAM, and an on-chip LCD driver supporting up to 160 segments - enabling direct interface to meter display panels.

For engineers reviewing the MSP430F4784IPZ datasheet, MSP430F4784IPZ pinout, MSP430F4784IPZ application, or MSP430F4784IPZ equivalent, key selection criteria include sigma-delta ADC channel count, LCD segment drive capability, low-power operating modes (LPM0–LPM4), and USCI support for UART/I²C/SPI communication in metering firmware stacks.

Technical Context

The MSP430F4784IPZ implements a 16-bit RISC CPU with 62.5-ns instruction cycle time and five software-selectable low-power modes, achieving 280 μA active current at 1 MHz/2.2 V and 0.2 μA off-mode (RAM retention). Its FLL+ clock system supports dual crystal oscillators (XT1 and XT2) and generates MCLK, SMCLK, and ACLK with programmable division.

It features two 16-bit timers (Timer_A3 and Timer_B3), four USCI modules (USCI_A0/A1/B0/B1), a hardware 32×32 multiplier, and integrated brownout detection with programmable SVS level. The SD16_A module includes four independent sigma-delta converters, each with differential input pairs and selectable gain - all mapped to dedicated analog input pins (A0.0± through A3.0±).

Key Specifications

Pinout & Package

Package: 100-pin plastic QFP (PZ), 14 mm × 14 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metrology microcontroller applications.

Compared with MSP430F4794IPZ, the MSP430F4784IPZ offers identical ADC performance and LCD integration at lower flash/RAM cost - ideal for cost-sensitive single-tariff meters. Versus ADUCM360BCPZ128, it delivers superior ultra-low-power operation and simpler system design for basic metrology, though with less computational headroom for advanced analytics.

Availability

MSP430F4784IPZ is available at Aetrix Electronics and suitable for electricity metering, energy monitoring gateways, smart grid sensor nodes, and portable power quality analyzers requiring stable component supply across industrial temperature ranges (−40°C to 85°C).

Supply support for MSP430F4784IPZ 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 specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision analog and low-power design.

The MSP430F47xx product line was engineered specifically for utility-grade electricity metering, integrating metrology-grade ADCs, LCD drivers, and ultra-low-power operation to meet IEC 62053 and ANSI C12 compliance requirements.

FAQ

What is the maximum number of LCD segments supported by the MSP430F4784IPZ?

The MSP430F4784IPZ integrates the LCD_A peripheral supporting up to 160 segments with 1/3 or 1/4 multiplexing. This is implemented using four COM outputs (COM0–COM3) and 40 SEG outputs (S0–S39), enabling full-featured numeric and icon-based displays in electricity meters without external drivers. The MSP430F4784IPZ's LCD controller includes built-in contrast control and charge pump support.

Does the MSP430F4784IPZ include hardware encryption or secure boot features?

The MSP430F4784IPZ does not include hardware AES or SHA accelerators. It provides programmable code protection via a security fuse that disables JTAG and BSL access after programming, preventing unauthorized flash readout. Secure boot is implemented in firmware using checksum validation and signature verification - the MSP430F4784IPZ's 48KB flash and hardware multiplier support efficient cryptographic operations in software.

How many independent sigma-delta ADC channels does the MSP430F4784IPZ have, and are they simultaneously sampled?

The MSP430F4784IPZ includes four independent 16-bit sigma-delta ADC modules (SD16_A channels 0–3), each with dedicated differential PGA inputs (A0.0± through A3.0±). While the converters operate independently and can be triggered synchronously via timer events, true simultaneous sampling requires external synchronization of conversion start signals - the MSP430F4784IPZ supports this via Timer_B3 output compare triggers routed to SD16_A control registers.

What is the wake-up time from LPM4 mode for the MSP430F4784IPZ, and which clock source enables it?

The MSP430F4784IPZ wakes up from LPM4 (full RAM retention, all clocks disabled) in less than 6 μs using its internal digitally controlled oscillator (DCO) as the MCLK source. This fast wake-up is enabled by the FLL+ module's DCO stabilization circuitry, allowing immediate execution of interrupt service routines - essential for capturing short-duration power events like voltage sags or tamper pulses without missing samples.

Can the MSP430F4784IPZ operate without external crystals, and what are the implications for metrology accuracy?

Yes, the MSP430F4784IPZ can operate using its internal DCO clock for general MCU functions, but metrology-grade accuracy requires external crystals: a 32.768 kHz watch crystal for real-time clock and time-stamping, and optionally a high-frequency crystal (e.g., 1–8 MHz) for precise ADC sampling clock derivation. The SD16_A module's performance specifications (e.g., ENOB, THD) assume use of stable crystal-referenced clocks - DCO-only operation degrades measurement repeatability and violates IEC 62053 calibration requirements.