Texas Instruments MSP430F123IDW

Overview

MSP430F123IDW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 8KB+256B flash memory, 256B RAM, 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 MSP430F123IDW datasheet, MSP430F123IDW pinout, MSP430F123IDW application, or MSP430F123IDW equivalent, key selection criteria include its 28-pin TSSOP package, −40°C to 85°C industrial temperature range, 0.7 μA standby current, <6 μs wake-up time, and integrated slope A/D capability for resistive sensors.

Technical Context

The MSP430F123IDW implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations. Its basic clock module supports multiple sources: internal DCO (stabilizes in <6 μs), 32 kHz crystal, high-frequency crystal, resonator, or external clock - all selectable via software-controlled BCSCTL registers.

Peripherals are memory-mapped and accessible via full instruction set support. The device integrates three 8-bit I/O ports (P1–P3), with P1 and P2 supporting edge-selectable interrupts; P3 has no interrupt capability. Timer_A3 provides capture/compare, PWM, and interval timing with dedicated interrupt vectors for CCR0, CCR1/CCR2, and overflow.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Thin Shrink Small-Outline Package (TSSOP), DW suffix, body width 4.4 mm, lead pitch 0.65 mm, industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F122IDW and MSP430F1132IDW, the MSP430F123IDW provides double the flash capacity and full USART0 flexibility - essential for field-upgradable sensor nodes or systems integrating SPI sensors, displays, or wireless modules without external logic.

Availability

MSP430F123IDW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and industrial process controllers requiring stable component supply, long-lifecycle support, and verified industrial-temperature performance.

Supply support for MSP430F123IDW 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 decades of microcontroller innovation.

The MSP430F123IDW belongs to the MSP430x12x ultralow-power mixed-signal MCU family, designed specifically for battery-operated measurement and sensing applications demanding extended runtime and integrated analog functionality.

FAQ

What is the maximum operating frequency of the MSP430F123IDW at 3.6 V?

The MSP430F123IDW supports a maximum system clock (MCLK) frequency of 8 MHz at VCC = 3.6 V, as specified in the recommended operating conditions. This applies to both active mode execution and peripheral clocking. At lower supply voltages (e.g., 1.8 V), the maximum frequency is reduced to 4.15 MHz to maintain timing margins and stability.

Does the MSP430F123IDW support hardware SPI communication?

Yes, the MSP430F123IDW supports hardware SPI through its USART0 module, which is software-configurable as either asynchronous UART or synchronous SPI. In SPI mode, it uses P3.0 (STE0), P3.1 (SIMO0), P3.2 (SOMI0), and P3.3 (UCLK0) pins and supports both 3-wire and 4-wire configurations with master/slave capability.

How does the on-chip comparator in the MSP430F123IDW enable slope A/D conversion?

The MSP430F123IDW's Comparator_A module generates a digital output that feeds directly into Timer_A's capture input (e.g., CCI0B on P2.2). When paired with a known ramp voltage and resistive sensor, the timer captures the time at comparator toggle - converting resistance to time, then to digital value. This eliminates external ADC components and associated layout complexity.

Can the MSP430F123IDW be programmed in-circuit without a JTAG debugger?

Yes, the MSP430F123IDW includes a factory-programmed Bootstrap Loader (BSL) that enables in-system programming via UART using only P1.1 (TX) and P2.2 (RX). No external programming voltage or JTAG interface is required - ideal for field firmware updates and low-cost production programming.

What are the absolute maximum ratings for VCC and I/O voltage on the MSP430F123IDW?

The absolute maximum rating for VCC is −0.3 V to 4.1 V relative to VSS. For any I/O pin, voltage must remain within −0.3 V to VCC + 0.3 V. Exceeding these limits risks permanent damage. These are stress ratings only; functional operation is guaranteed only within the recommended 1.8 V–3.6 V supply range and specified temperature conditions.