Texas Instruments MSP430F6735AIPN

Overview

MSP430F6735AIPN 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 supporting up to 320 segments, and eUSCI modules (3 UART/IrDA/SPI + 1 I²C). Operating from 1.8 V to 3.6 V, it delivers 265 µA/MHz active current at 8 MHz and 1.7 µA standby current with RTC active - enabling single-phase electronic watt-hour meters with long battery life and high accuracy.

For engineers reviewing the MSP430F6735AIPN datasheet, MSP430F6735AIPN pinout, MSP430F6735AIPN application, or MSP430F6735AIPN equivalent, key selection criteria include its 3-channel 24-bit SD24_B ADC architecture, 80-pin LQFP package with 52 GPIOs, integrated RTC with crystal offset calibration, auxiliary supply support for backup subsystem, and compliance with IEC 62053-21/22 for metering-grade measurement.

Technical Context

The MSP430F6735AIPN implements a 16-bit RISC CPU with 25-MHz system clock capability, unified clock system featuring FLL stabilization, VLO, REFO, and 32-kHz XT1 crystal support. Its power management includes a programmable LDO core regulator, supply voltage supervision, and dual auxiliary power rails for isolated RTC and backup memory operation.

It features four 16-bit timers (one with three capture/compare registers, three with two each), three-channel DMA, hardware multiplier for 32-bit operations, and password-protected RTC with temperature compensation - all optimized for deterministic, low-jitter sampling and real-time billing calculations in utility meter firmware.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F6735AIPN, the MSP430F6736AIPN provides headroom for future firmware expansion without PCB redesign, while the MSP430F6725AIPN reduces component cost where metrology channel count can be reduced - both maintain identical timing, power, and interface compatibility.

Availability

MSP430F6735AIPN is available at Aetrix Electronics and suitable for single-phase watt-hour meters, utility grid edge sensors, and smart energy monitoring gateways requiring stable component supply, long-term lifecycle assurance, and TI-authorized traceability.

Supply support for MSP430F6735AIPN 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, with over 50 years of innovation in low-power design and precision analog integration.

The MSP430F673xA product line targets utility metering and energy infrastructure applications, integrating metrology-grade ADCs, RTC, LCD, and ultra-low-power operation to replace discrete metrology AFEs and reduce system-level BOM cost.

FAQ

What is the maximum system clock frequency supported by the MSP430F6735AIPN?

The MSP430F6735AIPN 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 harmonic analysis and RMS calculation while maintaining ultra-low active-mode current of 265 µA/MHz at 8 MHz - ensuring responsive performance without compromising battery life in portable or backup-powered metering applications.

Does the MSP430F6735AIPN include hardware support for IEC 62053-22 Class 0.2 accuracy?

Yes, the MSP430F6735AIPN achieves IEC 62053-22 Class 0.2 accuracy through its three 24-bit sigma-delta ADCs with differential PGA inputs, on-chip reference calibration, and temperature-compensated RTC. When paired with precision external resistors and a 32.768-kHz crystal, the device meets the required <0.2% error envelope across –25°C to +70°C - validated in TI's TIDU023 reference design for compliant single-phase meters.

How many GPIO pins are available on the MSP430F6735AIPN in the 80-pin LQFP package?

The MSP430F6735AIPN provides 52 general-purpose I/O pins in its 80-pin LQFP (PN) package. These include dedicated analog inputs (e.g., SD0P0–SD2N0, A0–A5), LCD segment/commons (COM0–COM7, SEGx), and multiplexed digital functions (e.g., eUSCI, Timer_A, RTCCLK). All GPIOs support interrupt-on-change and configurable pullup/pulldown - enabling flexible interface design for optical ports, tamper switches, and sensor connections.

Can the MSP430F6735AIPN operate from a single 3.0-V supply without external regulators?

Yes, the MSP430F6735AIPN operates directly from a single 3.0-V supply using its integrated LDO core regulator, which generates a stable VCORE voltage. The device also supports separate AVCC (analog), DVCC (digital), and AUXVCC (backup) rails - allowing clean analog measurement and independent RTC operation. No external DC/DC or LDO is required for basic metering functionality, simplifying power design and reducing bill-of-materials cost.

What development tools are officially supported for the MSP430F6735AIPN?

Texas Instruments officially supports the MSP430F6735AIPN with the EVM430-F6736 evaluation module, Energy Measurement Design Center software, and Code Composer Studio IDE. The EVM430-F6736 includes calibrated shunt resistors, optical port interface, and LCD display - enabling immediate validation of metrology performance, RTC accuracy, and firmware behavior against IEC standards without custom hardware.