Texas Instruments MSP430F2101IRGER

Overview

MSP430F2101IRGER from Texas Instruments is an ultra-low-power 16-bit RISC mixed-signal microcontroller featuring 1 KB Flash, 128 B RAM, a 16-bit Timer_A with three capture/compare registers, and an on-chip analog comparator for slope A/D conversion - deployed in battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F2101IRGER datasheet, MSP430F2101IRGER pinout, MSP430F2101IRGER application, or MSP430F2101IRGER equivalent, key selection criteria include active-mode current at 1 MHz (250 µA @ 2.2 V), standby-mode wake-up time (<1 µs), brownout detection, JTAG-based on-chip emulation, and QFN-24 package compatibility with space-constrained PCB layouts.

Technical Context

The MSP430F2101IRGER implements a digitally controlled oscillator (DCO) with factory-calibrated frequencies up to 16 MHz and four internal calibration points (±1% accuracy), enabling rapid wake-up from LPM4 without external crystal dependency. Its basic clock module supports ACLK (32-kHz crystal), SMCLK (DCO-derived), and MCLK (system clock) with independent gating control.

It integrates a 16-bit Timer_A3 with three capture/compare registers supporting PWM generation, input capture, and interval timing - all interrupt-capable and configurable via dedicated I/O pins including P1.0/TACLK, P2.2/CAOUT/TA0, and P1.5/TA0/TMS. The analog comparator_A+ accepts eight selectable inputs (CA0–CA7) and provides CAOUT for slope ADC or voltage monitoring.

Key Specifications

Pinout & Package

Package: 24-pin QFN (RGE), 4 mm × 4 mm body, 0.5 mm pitch, exposed thermal pad connected to VSS per TI recommendation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F2101IRGER, MSP430F2111IRGER offers scalable code space while maintaining identical power profile and peripheral set, whereas MSP430G2231IRSA trades analog/crystal features for reduced size and cost - making the former a seamless upgrade and the latter a functionally streamlined alternative.

Availability

MSP430F2101IRGER is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial data loggers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MSP430F2101IRGER 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, embedded processing, and connectivity solutions with deep expertise in low-power design and precision signal chain technology.

The MSP430F21x1 product line targets ultra-low-power portable measurement and sensing applications - emphasizing extended battery life, integrated analog peripherals, and robust operation across industrial temperature ranges.

FAQ

What is the maximum operating frequency of the MSP430F2101IRGER?

The MSP430F2101IRGER supports a maximum system clock (MCLK) frequency of 16 MHz when VCC ≥3.3 V, with factory-calibrated DCO settings for 1 MHz, 8 MHz, 12 MHz, and 16 MHz. At 2.7 V, the maximum is 12 MHz, and at 1.8 V it is limited to 6 MHz - all specified in the recommended operating conditions table of the SLAS439F datasheet. The MSP430F2101IRGER CPU executes instructions directly from MCLK with a 62.5-ns cycle time at 16 MHz.

Does the MSP430F2101IRGER support crystal oscillator operation?

Yes, the MSP430F2101IRGER supports a 32.768-kHz watch crystal via XIN (Pin 4) and XOUT (Pin 3), enabling precise real-time clock functionality and low-jitter ACLK generation. The basic clock module allows simultaneous use of the crystal for ACLK while the DCO drives MCLK and SMCLK. Crystal load capacitance is configurable through BCSCTL3 register bits XCAP_x, and TI recommends a 9-pF crystal matched to internal and external capacitance for optimal stability.

How is flash memory programmed on the MSP430F2101IRGER?

Flash memory on the MSP430F2101IRGER can be programmed via three methods: JTAG interface using tools like MSP-FET430UIF, UART-based bootstrap loader (BSL) using P1.1 (TX) and P2.2 (RX), or in-system by the CPU itself. The BSL is protected by a user-defined password and a security key at address 0xFFDE; writing 0xAA55 disables BSL entirely. All flash segments (main and information memory) support individual or bulk erase, with segment A containing factory calibration data that is write-protected after reset unless explicitly unlocked.

What low-power modes does the MSP430F2101IRGER support, and what is the lowest current draw?

The MSP430F2101IRGER supports six operating modes: Active Mode (AM) and five low-power modes (LPM0–LPM4). The lowest current draw is in LPM4 (RAM retention, all clocks disabled), consuming 0.1 µA at 2.2 V and 25°C. LPM3 draws 0.7 µA with ACLK active (e.g., for RTC operation), and LPM0 draws 65 µA with SMCLK and DCO running at 1 MHz. Each mode is entered via CPUOFF, SCGx, and OSCOFF bit combinations in the status register, and all support wake-up via interrupts on P1/P2 or timer events.

Can the MSP430F2101IRGER perform analog-to-digital conversion without an external ADC?

Yes, the MSP430F2101IRGER implements slope analog-to-digital conversion using its on-chip Comparator_A+ module. By charging a known capacitor through a current source and measuring the time required for the comparator to trip against a reference voltage, the device converts analog input to digital values with resolution dependent on timing accuracy and reference stability. This technique eliminates the need for a dedicated SAR or delta-sigma ADC in cost- and space-constrained designs - and is explicitly documented in the SLAS439F datasheet as a primary application of the comparator.