Texas Instruments MSP430F2121IDGVR

Overview

MSP430F2121IDGVR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring 4 KB flash memory, 256 B RAM, a 16-bit Timer_A with three capture/compare registers, and an on-chip analog comparator for slope A/D conversion. It operates from 1.8 V to 3.6 V and supports active-mode current of 250 μA at 1 MHz/2.2 V, enabling battery-powered sensor node applications requiring long runtime and precision analog signal acquisition.

For engineers reviewing the MSP430F2121IDGVR datasheet, MSP430F2121IDGVR pinout, MSP430F2121IDGVR application, or MSP430F2121IDGVR equivalent, key selection criteria include its 20-pin TVSOP (DGV) package, calibrated DCO with ±1% accuracy across four frequencies (1/8/12/16 MHz), brownout detection, and integrated JTAG/emulation support for low-overhead debugging in resource-constrained embedded designs.

Technical Context

The MSP430F2121IDGVR implements a 16-bit RISC CPU with constant generators and seven addressing modes, achieving 62.5-ns instruction cycle time. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal input (XIN/XOUT), and high-frequency crystal support up to 16 MHz - all configurable via BCSCTL registers.

Power management is handled through six operating modes (AM, LPM0–LPM4), with sub-1-μs wake-up from standby (LPM3/LPM4) enabled by the DCO's fast stabilization. The analog comparator_A+ provides eight selectable inputs (CA0–CA7), CAOUT output, and direct integration with Timer_A for slope-based ADC functionality without external components.

Key Specifications

Pinout & Package

Package: 20-pin TVSOP (DGV), 4.4 mm × 6.5 mm body, 0.65 mm pitch, exposed thermal pad connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F2121IDGVR, MSP430F2012IPW offers lower cost and footprint but sacrifices RTC capability and memory headroom, while MSP430G2553IPW28 trades higher power for richer peripherals and scalability - making MSP430F2121IDGVR optimal for balanced sensor-node designs prioritizing ultra-low sleep current and crystal-based timing precision.

Availability

MSP430F2121IDGVR is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, portable medical devices, and smart utility meter interfaces requiring stable component supply and long-term industrial availability.

Supply support for MSP430F2121IDGVR 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 digital signal processing technologies with over 50 years of innovation in low-power design.

The MSP430F2121IDGVR belongs to the MSP430x2xx ultra-low-power microcontroller family, engineered specifically for battery-operated measurement systems where extended runtime, analog integration, and robust debug capability are mandatory.

FAQ

What is the maximum operating frequency of the MSP430F2121IDGVR?

The MSP430F2121IDGVR supports a maximum system clock (MCLK) frequency of 16 MHz when powered at ≥3.3 V, enabled by its factory-calibrated digitally controlled oscillator (DCO). This frequency is achievable without external crystals, though the DCO's ±1% accuracy at 16 MHz requires calibration register loading (CALBC1_16MHZ/CALDCO_16MHZ) from flash segment A. The MSP430F2121IDGVR maintains full functionality across its 1.8–3.6 V supply range, with frequency scaling automatically adjusted per supply voltage per the device's recommended operating conditions.

Does the MSP430F2121IDGVR support crystal oscillator operation?

Yes, the MSP430F2121IDGVR supports external crystal oscillators on pins XIN/P2.6 and XOUT/P2.7, including 32.768 kHz watch crystals for real-time clock applications and high-frequency crystals up to 16 MHz. The basic clock module allows simultaneous use of the crystal oscillator (LFXT1 or HFXT1) and the internal DCO, enabling hybrid clock configurations - for example, ACLK from the 32.768 kHz crystal while MCLK/SMCLK derive from the DCO. Crystal startup time and fault detection are managed by the oscillator fault flag (OFIFG) and associated control bits in BCSCTL registers.

How does the analog comparator in the MSP430F2121IDGVR enable slope A/D conversion?

The MSP430F2121IDGVR's Comparator_A+ module performs slope A/D conversion by charging a capacitor at a known current and comparing its voltage against the input signal using the comparator's output (CAOUT) to trigger Timer_A capture events. With eight selectable inputs (CA0–CA7), internal references, and direct CAOUT connection to Timer_A's CCIxB inputs, the MSP430F2121IDGVR executes this technique autonomously - eliminating the need for external op-amps or ADC ICs. This method achieves effective resolutions up to 12 bits depending on timing stability and noise control, as documented in TI's SLAU144 user guide.

What debug and programming interfaces are supported by the MSP430F2121IDGVR?

The MSP430F2121IDGVR integrates a hardware emulation module (EEM) supporting full JTAG debugging via the TEST, RST/NMI, TCK, TMS, TDI, and TDO pins - compatible with standard tools like MSP-FET430UIF. It also includes a UART-based bootstrap loader (BSL) accessible through P1.1 (TX) and P2.2 (RX), allowing in-system programming without JTAG hardware. Both interfaces support flash memory programming, RAM download, and real-time variable inspection, with BSL security configurable via the 0xFFDE address key to disable erasure or fully lock the loader.

Is the MSP430F2121IDGVR pin-compatible with other devices in the MSP430F21x1 family?

Yes, the MSP430F2121IDGVR shares identical pinout and electrical characteristics with other 20-pin variants in the MSP430F21x1 family - including MSP430F2101IDGVR, MSP430F2111IDGVR, and MSP430F2131IDGVR - all packaged in the TVSOP (DGV) format. Differences are limited to flash/RAM sizes and factory calibration data; peripheral registers, interrupt vectors, and I/O functionality remain binary-compatible. This allows hardware reuse across product tiers - for example, designing a single PCB that supports 1 KB to 8 KB flash variants solely through firmware configuration and BOM selection.