Texas Instruments MSP430AFE252IPWR

Overview

MSP430AFE252IPWR from Texas Instruments is an ultra-low-power mixed-signal microcontroller featuring two independent 24-bit sigma-delta ADCs, a 16-bit RISC CPU, 16 KB flash, 512 B RAM, and integrated peripherals including Timer_A3, USART0 (UART/SPI), hardware multiplier, and supply monitoring. It operates from 1.8 V to 3.6 V and targets precision metrology applications such as single-phase electricity meters.

For engineers reviewing the MSP430AFE252IPWR datasheet, MSP430AFE252IPWR pinout, MSP430AFE252IPWR application, or MSP430AFE252IPWR equivalent, key selection criteria include dual 24-bit SD24_A ADC channel count, TSSOP-24 package compatibility, ultra-low active current (220 µA at 1 MHz/2.2 V), and support for crystal oscillators up to 16 MHz.

Technical Context

The MSP430AFE252IPWR implements a 16-bit RISC architecture with five low-power modes and sub-1 µs wake-up from standby. Its core clock system integrates a digitally controlled oscillator (DCO) with two factory-calibrated frequencies, internal VLO, and external HF crystal support up to 16 MHz.

It integrates two independent SD24_A sigma-delta ADC modules-each with differential PGA inputs, programmable gain, and built-in voltage reference-alongside a 16-bit Timer_A3 with three capture/compare registers and a USART0 supporting asynchronous UART or synchronous SPI operation via software configuration.

Key Specifications

Pinout & Package

The MSP430AFE252IPWR is housed in a 24-pin TSSOP (PW) package with exposed pad not present; body size is 7.8 mm × 4.4 mm. Pin 8 and Pin 9 are NC (no connect) and must be tied to AVSS per TI design guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430AFE253IPW and MSP430AFE232IPW, the MSP430AFE252IPWR delivers optimal balance of ADC channel count, memory headroom, and cost for Class 0.5 single-phase meters requiring firmware extensibility and dual-channel precision acquisition.

Availability

MSP430AFE252IPWR is available at Aetrix Electronics and suitable for single-phase electricity meters, digital power monitors, and portable energy audit tools requiring stable component supply and long-term industrial lifecycle support.

Supply support for MSP430AFE252IPWR 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 design.

The MSP430AFE2xx product line was engineered specifically for high-accuracy metrology applications, integrating precision sigma-delta ADCs, ultra-low-power operation, and robust packaging for utility-grade energy measurement systems.

FAQ

What is the maximum crystal frequency supported by the MSP430AFE252IPWR?

The MSP430AFE252IPWR supports external high-frequency crystals up to 16 MHz on the XT2IN/XT2OUT pins. When using crystals above 12 MHz to source the CPU clock (MCLK), the MCLK divider must be configured to ensure the CPU runs below 8 MHz, as specified in the device's operating conditions. This capability enables precise timekeeping and high-speed serial communication while maintaining system stability.

How many analog input channels does the MSP430AFE252IPWR support?

The MSP430AFE252IPWR integrates two independent 24-bit sigma-delta ADC modules (SD24_A), each with a dedicated differential input pair: A0.0+/A0.0− and A1.0+/A1.0−. These support programmable gain amplifiers and internal reference buffers, enabling simultaneous high-precision acquisition of two analog signals-such as phase current and voltage-in metrology applications without multiplexing.

Does the MSP430AFE252IPWR include a hardware multiplier?

Yes, the MSP430AFE252IPWR includes a 16-bit hardware multiplier (MPY, MPYS, MAC, MACS) capable of signed/unsigned multiply and multiply-accumulate operations. This peripheral accelerates computationally intensive tasks common in energy metering firmware-including RMS calculation, harmonic analysis, and tariff-based energy summation-reducing CPU load and improving real-time determinism compared to software-only implementations.

What power-saving modes are available on the MSP430AFE252IPWR?

The MSP430AFE252IPWR offers five low-power modes: LPM0 through LPM4. LPM4 achieves 0.1 µA current draw with RAM retention, while LPM3 draws 0.5 µA with VLO active. Wake-up from LPM4 to active mode occurs in less than 1 µs. These modes are essential for extending battery life in portable or backup-powered metering devices where periodic wake-up for measurement and transmission is required.

Is the MSP430AFE252IPWR pin-compatible with other devices in the MSP430AFE2xx family?

Yes, the MSP430AFE252IPWR shares the same 24-pin TSSOP (PW) package and pinout with all MSP430AFE2xx variants-including MSP430AFE253IPW and MSP430AFE232IPW-enabling drop-in replacement within the same footprint. However, pin functions related to unused ADC channels (e.g., A2.0+/A2.0− on MSP430AFE253IPW) are NC on the MSP430AFE252IPWR, and must be tied to AVSS per TI guidelines.