Texas Instruments MSP430F6735AIPNR

Overview

MSP430F6735AIPNR from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering. 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 an 80-pin LQFP package.

For engineers reviewing the MSP430F6735AIPNR datasheet, MSP430F6735AIPNR pinout, MSP430F6735AIPNR application, or MSP430F6735AIPNR equivalent, this device is selected for precision energy measurement systems requiring low-power operation, integrated metrology peripherals, and long-term RTC accuracy with temperature compensation.

Technical Context

The MSP430F6735AIPNR implements a 16-bit RISC CPU with 25-MHz system clock capability and flexible power management including programmable LDO core regulation, multiple low-power modes (LPM3.5 at 1.24 µA, LPM4.5 at 0.78 µA), and fast 3-µs wake-up from standby. Its metrology subsystem features differential PGA inputs on all three SD24_B ADCs and internal reference options (1.5 V/2.0 V/2.5 V) for high-accuracy current/voltage sensing.

It supports dual-supply operation with separate analog (AVCC/AVSS) and digital (DVCC/DVSS) domains, dedicated auxiliary supply pins (AUXVCC1–3), and isolated backup subsystem (RTC + 4×16-bit backup RAM) powered independently - enabling continuous timekeeping during main power loss without external circuitry.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm, exposed thermal pad (not electrically connected). Pin functions include dedicated metrology inputs (SD0P0/SD0N0 through SD2P0/SD2N0), auxiliary supply rails (AUXVCC1–3), LCD segment/common drivers (COM0–COM7, S0–S39), and dual-domain I/O (DVCC/DVSS and AVCC/AVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6736AIPNR, the MSP430F6735AIPNR trades 4 KB RAM for lower unit cost while retaining full metrology capability; versus MSP430F6725AIPNR, it adds a third SD24_B ADC enabling neutral current detection for advanced tamper diagnostics and unbalanced load analysis.

Availability

MSP430F6735AIPNR is available at Aetrix Electronics and suitable for single-phase metering, utility grid monitoring, and smart energy gateway applications requiring stable component supply, long-term lifecycle support, and TI-qualified metrology performance.

Supply support for MSP430F6735AIPNR 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 for industrial, automotive, and consumer markets.

The MSP430F673xA family is engineered specifically for precision energy measurement systems, integrating metrology-grade ADCs, RTC, LCD, and communication peripherals into a single ultra-low-power MCU platform.

FAQ

What is the maximum system clock frequency supported by the MSP430F6735AIPNR?

The MSP430F6735AIPNR supports a maximum system clock frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This allows high-speed execution of metrology algorithms - such as RMS, fundamental power, and harmonic analysis - while maintaining compatibility with TI's MSP430F6xx Family User's Guide timing constraints and peripheral clock dividers.

Does the MSP430F6735AIPNR include hardware support for secure firmware updates?

Yes, the MSP430F6735AIPNR includes a bootloadable flash memory architecture and supports secure firmware updates via its UART-based BSL (Bootloader). The device also provides password protection for the RTC and memory segments, and its four eUSCI modules enable encrypted communication paths - for example, using I²C to interface with a secure element that validates firmware signatures before loading into MSP430F6735AIPNR flash.

How many independent 24-bit ADC channels does the MSP430F6735AIPNR integrate?

The MSP430F6735AIPNR integrates three independent 24-bit sigma-delta ADCs (SD24_B modules), each with differential PGA inputs and programmable gain. These are fully configurable for simultaneous sampling of voltage, phase current, and neutral current - meeting IEC 62053-22 Class 0.2 accuracy requirements without external signal conditioning.

What LCD configuration options are supported by the MSP430F6735AIPNR?

The MSP430F6735AIPNR supports LCD_C controller operation in 4-mux and 8-mux modes, driving up to 320 segments with 8 commons (COM0–COM7). It includes integrated contrast control via internal resistor ladder and charge pump (LCDCAP pin), eliminating external bias generation circuitry - simplifying design for front-panel displays in utility meters and smart plugs.

Is the MSP430F6735AIPNR pin-compatible with other devices in the MSP430F673xA family?

Yes, the MSP430F6735AIPNR in the 80-pin LQFP (PN) package shares identical pinout and electrical characteristics with MSP430F6736AIPNR, MSP430F6734AIPNR, and MSP430F6733AIPNR. This enables drop-in replacement during design iteration or volume production - for example, upgrading to MSP430F6736AIPNR for additional RAM without PCB revision.