Texas Instruments MSP430F6735AIPZR

Overview

MSP430F6735AIPZR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for precision energy metering applications. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver (up to 320 segments), real-time clock with crystal offset calibration, and four enhanced USCI modules (three UART/IrDA/SPI + one I²C) in a 100-pin LQFP package. It operates from 1.8 V to 3.6 V and supports single-phase electronic watt-hour metering.

For engineers reviewing the MSP430F6735AIPZR datasheet, MSP430F6735AIPZR pinout, MSP430F6735AIPZR application, or MSP430F6735AIPZR equivalent, key selection criteria include its triple 24-bit SD24_B ADC architecture, integrated RTC with temperature compensation, low-power LPM3.5 mode (1.24 µA), and dedicated auxiliary supply domain for backup subsystem operation - all critical for Class 0.2 utility meter designs requiring long-term accuracy and battery-backed timekeeping.

Technical Context

The MSP430F6735AIPZR implements a 16-bit RISC CPU with 25-MHz system clock capability and extended memory addressing. Its analog subsystem centers on three independent 24-bit sigma-delta ADCs with differential PGA inputs, each supporting programmable gain and data rate up to 256 kSPS per channel, plus a separate 10-bit ADC with internal reference and temperature sensor input.

Digital peripherals include four 16-bit timers (one with three capture/compare registers, three with two each), hardware multiplier for 32-bit operations, three-channel DMA, and a unified clock system featuring FLL stabilization, VLO, REFO, and 32-kHz XT1 crystal support. The device uses a fully integrated LDO with programmable core voltage and dual-supply domains (DVCC/AVCC/AUXVCC) to isolate precision analog paths.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, standard JEDEC footprint with exposed thermal pad (not electrically connected). Designed for industrial-grade reflow and long-term reliability in sealed meter enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6736AIPZR, the MSP430F6735AIPZR trades 4 KB RAM for lower cost and power in single-phase meters needing only two current channels; versus MSP430F6725AIPZR, it adds a third SD24_B ADC channel essential for high-accuracy neutral current monitoring in anti-tampering and leakage detection systems.

Availability

MSP430F6735AIPZR is available at Aetrix Electronics and suitable for single-phase electronic watt-hour meters, utility grid edge sensors, and smart energy monitoring gateways requiring stable component supply across 10+ year product lifecycles.

Supply support for MSP430F6735AIPZR 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 and embedded processing solutions for industrial, automotive, and consumer applications.

The MSP430F673xA family is engineered specifically for high-accuracy, ultra-low-power energy metering - integrating metrology-grade ADCs, RTC, LCD, and communication peripherals into a single chip to reduce system cost and certification effort for utility-grade meters.

FAQ

What is the maximum sampling rate supported by the SD24_B ADCs in the MSP430F6735AIPZR?

The MSP430F6735AIPZR's three SD24_B ADCs support up to 256 kSPS aggregate sampling rate across all channels. Each ADC can be configured independently for data rates from 64 SPS to 128 kSPS depending on resolution and filter settings, enabling simultaneous high-speed waveform capture for harmonic analysis and transient detection in utility metering applications.

Does the MSP430F6735AIPZR support crystal oscillator calibration for the RTC?

Yes, the MSP430F6735AIPZR includes password-protected RTC calibration with both crystal offset adjustment and temperature compensation. This allows the device to maintain ±0.5 ppm time accuracy over –40°C to 85°C without external temperature sensors or TCXOs - a key requirement for IEC 62053-21 compliant metering designs.

How many GPIO pins are available on the MSP430F6735AIPZR in the 100-pin LQFP package?

The MSP430F6735AIPZR provides 72 general-purpose I/O pins in its 100-pin LQFP (PZ) package. These include multiplexed functions for timers, USCI modules, ADC inputs, LCD segments, and auxiliary supplies - with full port mapping control to optimize PCB layout for noise-sensitive metrology signal chains.

What is the lowest power consumption mode available on the MSP430F6735AIPZR with RTC active?

The lowest power mode with RTC active is LPM3.5 (Shutdown RTC Mode), consuming 1.24 µA at 3.0 V. In this mode, the main CPU and flash are powered down while the 32-kHz crystal-based RTC, backup RAM, and crystal oscillator remain operational - enabling decade-long battery-backed timekeeping in tamper-evident utility meters.

Can the MSP430F6735AIPZR drive an LCD display directly without external components?

Yes, the MSP430F6735AIPZR integrates the LCD_C peripheral capable of driving up to 320 segments in 8-mux configuration with programmable contrast control and internal charge pump. It requires only external bias resistors or capacitors depending on display type - eliminating the need for external LCD controllers or voltage boosters in cost-sensitive meter displays.