Texas Instruments MSP430A148IPZR

Overview

MSP430A148IPZR from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller designed for single-phase electricity metering applications. It integrates four 16-bit sigma-delta ADCs with differential PGA inputs, 48KB flash + 256B information memory, 2KB RAM, and an integrated LCD driver supporting up to 160 segments. Operates from 1.8 V to 3.6 V with active-mode current of 280 μA at 1 MHz and 2.2 V.

For engineers reviewing the MSP430A148IPZR datasheet, MSP430A148IPZR pinout, MSP430A148IPZR application, or MSP430A148IPZR 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 in metering-grade embedded systems.

Technical Context

The MSP430A148IPZR implements a 16-bit RISC CPU with constant generators and 62.5-ns instruction cycle time, paired with FLL+ clock system supporting XT1 (32.768 kHz), XT2 (up to 16 MHz), and DCO with sub-6-μs wake-up from standby. Its SD16_A module provides four independent 16-bit sigma-delta converters, each with programmable gain and differential input pairs (A0–A3).

Peripherals include two 16-bit timers (Timer_A3 and Timer_B3) with capture/compare registers and shadow registers, four USCI modules (USCI_A0/A1/B0/B1) supporting UART, IrDA, SPI, and I²C, and a hardware 32×32 multiplier. The device uses dedicated analog and digital supply domains (AVCC/AVSS, DVCC1/DVCC2/DVSS1/DVSS2) with separate voltage supervisor (SVS/SVM) and brownout detection.

Key Specifications

Pinout & Package

100-pin plastic QFP (PZ package), 0.5 mm pitch, RoHS-compliant. Thermal pad exposed on underside for enhanced heat dissipation in sealed meter enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F4794IPZR, the MSP430A148IPZR offers optimal balance of flash/RAM for certified metrology code while retaining full four-channel ADC capability; versus MSP430F4783IPZR, it adds critical A3.0± inputs for neutral monitoring without layout change.

Availability

MSP430A148IPZR is available at Aetrix Electronics and suitable for smart electricity metering, energy gateway design, and grid-edge sensor development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MSP430A148IPZR 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 low-power microcontrollers.

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

FAQ

What is the exact flash and RAM capacity of the MSP430A148IPZR?

The MSP430A148IPZR contains 48KB of main flash memory, 256B of information memory (for calibration data), and 2KB of RAM. This configuration matches the MSP430F4784IPZR variant and is validated in the SLAS545C datasheet revision March 2011. The memory map allocates 0x4000–0xFFFF for flash and 0x0200–0x09FF for RAM, enabling robust implementation of metrology algorithms and display firmware within the MSP430A148IPZR.

Does the MSP430A148IPZR support four independent sigma-delta ADC channels?

Yes, the MSP430A148IPZR supports four 16-bit sigma-delta ADC channels (A0–A3) with differential PGA inputs, as confirmed by the functional block diagram and terminal functions table in SLAS545C. Pins A3.0+ (pin 96) and A3.0− (pin 97) are connected and functional - distinguishing it from the MSP430F4783/F4793 variants which omit A3. This enables true four-channel simultaneous sampling for voltage, current, neutral, and auxiliary measurements in the MSP430A148IPZR.

What package type and pin count does the MSP430A148IPZR use?

The MSP430A148IPZR is housed in a 100-pin plastic quad flatpack (PZ package) with 0.5 mm lead pitch, as specified in the "Available Options" table of SLAS545C. This QFP package is RoHS-compliant and thermally optimized for convection-cooled meter enclosures. Pin compatibility is maintained across the MSP430F47xx family, allowing direct substitution with MSP430F4784IPZR or MSP430F4794IPZR without PCB redesign for the MSP430A148IPZR.

Can the MSP430A148IPZR drive a 160-segment LCD directly?

Yes, the MSP430A148IPZR integrates the LCD_A peripheral supporting up to 160 segments with 1/3 or 1/4 bias configuration and programmable contrast control. It provides four COM outputs (COM0–COM3) and 40 SEG outputs (S0–S39), plus additional segment-capable GPIOs (e.g., P7.x–P10.x), enabling full drive of standard utility meter LCDs without external bias ICs or segment drivers in the MSP430A148IPZR.

What low-power modes are supported by the MSP430A148IPZR and what are their typical currents?

The MSP430A148IPZR supports five software-selectable low-power modes: LPM0 (1.1 μA), LPM1 (0.7 μA), LPM2 (0.5 μA), LPM3 (0.2 μA), and LPM4 (0.2 μA with RAM retention). These values are measured at 2.2 V and 25°C per SLAS545C Section 1. All modes retain RAM content and support wake-up via interrupts from peripherals including ADC, timers, and USCI. The sub-6-μs wake-up time from LPM4 ensures responsive event handling in the MSP430A148IPZR.