Texas Instruments MSP430F122IPW

Overview

MSP430F122IPW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 4KB Flash + 256B RAM, 22 I/O pins, a 16-bit Timer_A with three capture/compare registers, on-chip analog comparator, and USART0 supporting UART/SPI protocols. It operates from 1.8 V to 3.6 V and targets battery-powered sensor systems requiring sub-μA standby current and fast wake-up.

For engineers reviewing the MSP430F122IPW datasheet, MSP430F122IPW pinout, MSP430F122IPW application, or MSP430F122IPW equivalent, key selection criteria include its 0.7 μA standby current, <6 μs wake-up time from LPM3, integrated slope A/D via comparator, and TSSOP-28 package compatibility with legacy MSP430x1xx designs.

Technical Context

The MSP430F122IPW implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock module supports multiple sources: internal DCO (stabilizes in <6 μs), 32 kHz crystal, external resistor, or high-frequency crystal.

Peripherals are memory-mapped and accessible via all instructions. The device integrates Timer_A3 with three independent capture/compare registers, dual-mode USART0 (UART/SPI), and Comparator_A for analog signal comparison or single-slope ADC - all controllable via dedicated SFRs at fixed addresses (e.g., TACCR0 at 017Ah, U0RXBUF at 076h).

Key Specifications

Pinout & Package

Package: 28-pin Plastic Thin Shrink Small-Outline Package (TSSOP), body width 4.4 mm, lead pitch 0.65 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F122IPW, MSP430F123IPW offers double Flash capacity with zero hardware change, while MSP430F2274IPW delivers modern peripherals and larger memory but requires firmware adaptation for USCI and ADC modules.

Availability

MSP430F122IPW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and industrial data loggers requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F122IPW 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 focused on analog and embedded processing technologies, with decades of expertise in low-power microcontrollers and signal chain solutions.

The MSP430F12x product line was designed specifically for ultralow-power mixed-signal applications in battery-operated measurement systems, emphasizing rapid wake-up, integrated analog peripherals, and minimal active/standby current.

FAQ

What is the maximum system clock frequency supported by the MSP430F122IPW?

The MSP430F122IPW supports up to 8 MHz MCLK at 3.6 V supply voltage, and 4.15 MHz at 1.8 V. This is achieved using the internal digitally controlled oscillator (DCO) or external crystal/resonator sources. The actual achievable frequency depends on VCC level and selected clock source - for example, the DCO delivers full range only above 2.2 V. MSP430F122IPW does not require external clock circuitry for basic operation due to its integrated DCO.

Does the MSP430F122IPW support in-system programming without external hardware?

Yes, the MSP430F122IPW supports in-system programming via its built-in Bootstrap Loader (BSL), which uses UART communication on P1.1 (TX) and P2.2 (RX). No external programming voltage is required - standard 1.8–3.6 V supply suffices. Access is protected by a user-configurable password, and the BSL remains functional even if JTAG is disabled. MSP430F122IPW enables field firmware updates without dedicated programmers.

How many I/O pins does the MSP430F122IPW provide, and which ports support interrupts?

The MSP430F122IPW provides 22 usable I/O pins across Ports P1 (8 pins), P2 (6 pins), and P3 (8 pins). Only P1 and P2 support edge-selectable interrupts - all 8 bits of P1 and the 6 implemented bits of P2 (P2.0–P2.5) can generate interrupt flags (P1IFG/P2IFG) with configurable rising/falling edge sensitivity. Port P3 has no interrupt capability. MSP430F122IPW reserves P1.4/TCK and P1.5/TMS for JTAG but allows reassignment as GPIO when JTAG is disabled.

What analog capabilities does the MSP430F122IPW offer without external components?

The MSP430F122IPW integrates a single analog comparator (Comparator_A) with two selectable inputs (CA0, CA1), output (CAOUT), and internal connection to Timer_A for slope A/D conversion. It supports battery voltage monitoring, resistive sensor reading, and windowed threshold detection - all without external op-amps or ADCs. The comparator connects directly to P2.2 (CAOUT), P2.3 (CA0), and P2.4 (CA1), enabling standalone analog signal conditioning. MSP430F122IPW does not include a dedicated ADC module.

Is the MSP430F122IPW pin-compatible with other packages in the MSP430F12x family?

Yes, the MSP430F122IPW (TSSOP-28) shares identical pin functions and numbering with the MSP430F122IDW (SOWB-28) - both have 28-pin footprints with matching signal assignments. However, it is not pin-compatible with the 32-pin QFN (RHB) variant, which adds four NC pins and relocates several signals. Designers may migrate between DW and PW packages without PCB changes; migration to RHB requires layout revision. MSP430F122IPW maintains full software compatibility across all MSP430F12x packages.