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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

Texas Instruments MSP430F1122IDW

Name: MSP430F1122IDW
Brand: Texas Instruments
SKU: MSP430F1122IDW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MSP430F1122IDW

Manufacturer:: Texas Instruments

Category:: Microcontrollers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: MSP430F1122IDW.pdf

Description:: IC MCU 16BIT 4KB FLASH 20SOIC

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Product details

Overview

MSP430F1122IDW from Texas Instruments is an ultralow-power 16-bit RISC microcontroller with 4KB flash, 256B RAM, 10-bit ADC, Timer_A3 with three capture/compare registers, and serial communication capability via UART/SPI (not implemented in this variant). It operates from 1.8 V to 3.6 V and supports five power-saving modes, enabling battery-powered sensor nodes and portable measurement systems.

For engineers reviewing the MSP430F1122IDW datasheet, MSP430F1122IDW pinout, MSP430F1122IDW application, or MSP430F1122IDW equivalent, key selection criteria include active-mode current (200 µA @ 1 MHz, 2.2 V), wake-up time (<6 µs from standby), 20-pin TSSOP/SOWB package compatibility, and absence of integrated USART - distinguishing it from MSP430x12x2 family members.

Technical Context

The MSP430F1122IDW implements a 16-bit CPU with constant generators and seven addressing modes, executing register-to-register instructions in one CPU clock cycle (125 ns at 8 MHz). Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and internal resistors for flexible low-power clocking.

This device belongs to the MSP430x11x2 series and lacks the USART0 peripheral present in MSP430x12x2 variants. It features two 8-bit I/O ports (P1, P2), 14 GPIO pins, analog inputs A0–A4, and dedicated ADC reference terminals (VREF+/VREF−) - all mapped to its 20-pin DW package with no P3 port.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	16-bit RISC CPU with 125 ns instruction cycle; enables deterministic real-time control in resource-constrained embedded systems.
Memory	4KB flash + 256B RAM; sufficient for firmware with ADC data logging, sensor fusion, and low-level protocol stacks without external memory.
Power Consumption	Active mode: 200 µA @ 1 MHz, 2.2 V; Standby: 0.7 µA; Off mode (RAM retention): 0.1 µA - optimized for multi-year battery life in intermittent-sensing applications.
ADC	10-bit SAR ADC with 200 ksps sampling, internal reference, sample-and-hold, autoscan, and data transfer controller (DTC); eliminates CPU overhead during continuous sensor acquisition.
Timer	16-bit Timer_A3 with three capture/compare registers; supports PWM generation, input capture for pulse-width measurement, and precise interval timing.
Supply Range	1.8 V to 3.6 V; compatible with single-cell Li-ion, LiFePO₄, and dual-cell alkaline battery configurations without regulation.
Operating Temperature	−40°C to +85°C; qualified for industrial and automotive cabin-adjacent environments.

Pinout & Package

Package: 20-pin Plastic TSSOP (PW) or Small Outline Wide Body (SOWB, DW). The MSP430F1122IDW uses the DW variant (20-pin SOWB), with exposed pad not present and no thermal pad requirement.

Pin/Terminal	Circuit Role	Design Meaning
1 TEST	JTAG test mode select	Enables boundary-scan and debug access; must be pulled low during normal operation to avoid unintended test entry.
2 VCC	Supply voltage	Main power rail; requires local 100 nF ceramic decoupling adjacent to pin for stable low-power operation.
3 P2.5/ROSC	DCO resistor input	Connects external resistor to set nominal DCO frequency; critical for fast wake-up timing accuracy in LPM3/LPM4.
4 VSS	Ground reference	Primary return path; must be connected to low-impedance ground plane to minimize noise coupling into ADC and analog inputs.
5 XOUT	Clock oscillator output	Drives 32-kHz crystal; requires matched load capacitance per crystal spec to maintain timing stability across temperature.
6 XIN	Clock oscillator input	Accepts 32-kHz crystal or external clock source; enables ultra-low-power real-time clock functionality.
7 RST/NMI	Reset / nonmaskable interrupt	Active-low reset input; also serves as NMI source for critical fault handling (e.g., brownout detection).
8 P2.0/ACLK/A0	ACLK output / ADC channel 0	Provides auxiliary clock signal or analog input; used for synchronous timing or single-ended sensor interface.
9 P2.1/INCLK/A1	Timer_A clock input / ADC channel 1	Accepts external clock for Timer_A or serves as second analog input; supports differential measurements with A0.
10 P2.2/TA0/A2	Timer_A capture/compare 0 / ADC channel 2	Supports edge-triggered event capture or PWM output; also functions as third analog input for multi-channel sensing.
11 P2.3/TA1/A3/VREF−	Timer_A capture/compare 1 / ADC channel 3 / negative reference	Configurable as analog input or VREF− terminal; enables ratiometric measurements when paired with internal reference.
12 P2.4/TA2/A4/VREF+	Timer_A capture/compare 2 / ADC channel 4 / positive reference	Supports fourth/fifth analog input or VREF+; allows external reference biasing or internal 2.5 V reference selection.
13 P1.0/TACLK/ADC10CLK	Timer_A clock / ADC conversion clock	Routes system clock to Timer_A or ADC; enables synchronized sampling and timer-triggered conversions.
14 P1.1/TA0	Timer_A capture/compare 0	Dedicated I/O for CCI0A input or Out0 output; used for PWM-driven actuators or pulse-width decoding.
15 P1.2/TA1	Timer_A capture/compare 1	Second compare/capture channel; supports complementary PWM outputs or dual-sensor timing correlation.
16 P1.3/TA2	Timer_A capture/compare 2	Third compare/capture channel; enables three-phase motor control or multi-event timestamping.
17 P1.4/SMCLK/TCK	Sub-main clock output / JTAG test clock	Provides SMCLK to peripherals or serves as TCK during programming; requires pull-down if unused to prevent leakage.
18 P1.5/TA0/TMS	Timer_A compare 0 / JTAG test mode select	Dual-function pin; TMS must be driven during JTAG programming; TA0 output usable only when JTAG disabled.
19 P1.6/TA1/TDI/TCLK	Timer_A compare 1 / JTAG test data input	Shared with JTAG; TA1 output available only in application mode; TDI requires clean digital signal for reliable programming.
20 P1.7/TA2/TDO/TDI	Timer_A compare 2 / JTAG test data output/input	Configured as TDO or TDI via JTAG instruction; TA2 output accessible only outside debug sessions.

Key Features

Feature	Design Value
Ultralow-power operation	0.1 µA off-mode current with RAM retention enables energy harvesting and coin-cell longevity in maintenance-free deployments.
Fast wake-up from LPM3	<6 µs wake-up time allows rapid response to external interrupts while maintaining µA-level sleep current - critical for duty-cycled sensor wake-ups.
Integrated ADC with DTC	Data Transfer Controller automates storage of 16 consecutive ADC results to RAM without CPU intervention, reducing active time and power.
Programmable code protection	Security fuse prevents unauthorized read-out of flash contents, protecting proprietary algorithms and calibration data in field-deployed devices.
Digital-controlled oscillator (DCO)	Internal DCO stabilizes in <6 µs and supports frequency tuning via DCOCTL register - eliminates need for external high-speed crystal in cost-sensitive designs.
Supply voltage brownout protection	On-chip POR/BOR circuit ensures reliable reset during power ramp-up/down, preventing erratic behavior in battery-voltage sag conditions.

Applications

Portable Gas Sensor Node	Smart Thermostat Sensor Hub
Use Scenario: Battery-powered CO₂ and VOC sensor node performing periodic air quality sampling and wireless transmission every 5 minutes. IC Role / Device Role / Timing Role: Central MCU managing ADC acquisition, temperature compensation math, low-power sleep scheduling, and BSL-based firmware updates over UART. Use Value: 0.1 µA off-mode current extends CR2032 battery life beyond 5 years; 10-bit ADC with internal reference ensures stable ratiometric readings across supply voltage drift.	Use Scenario: Wall-mounted HVAC sensor hub collecting ambient temperature, humidity, and occupancy data using analog and digital sensors. IC Role / Device Role / Timing Role: System controller interfacing thermistors and capacitive humidity sensors via ADC inputs A0–A4, coordinating timed sampling and I²C sensor reads. Use Value: Five programmable low-power modes allow dynamic adaptation: LPM3 during idle, LPM0 during ADC conversion, and sub-µA standby between 30-second sampling intervals.
Industrial Current Loop Transmitter	Wireless Remote Meter Reader
Use Scenario: 4–20 mA loop-powered transmitter converting pressure sensor output to standardized analog current signal. IC Role / Device Role / Timing Role: Precision analog front-end controller acquiring bridge sensor output, performing linearization, and driving DAC or PWM-based current output stage. Use Value: VREF+/VREF− pins enable true differential reference for 10-bit ADC, achieving <±0.5% full-scale error over −40°C to +85°C without external precision references.	Use Scenario: Solar-charged water/gas meter reader transmitting pulse-count data via sub-GHz RF link every 15 minutes. IC Role / Device Role / Timing Role: Low-energy coordinator managing optical pulse detection on P1.x, timestamping events with Timer_A3, and triggering RF transmission after accumulation. Use Value: 16-bit Timer_A3 with three capture registers enables simultaneous monitoring of multiple mechanical meter dials; wake-up from LPM4 in <6 µs captures first pulse edge reliably.

Portable Gas Sensor Node

Smart Thermostat Sensor Hub

Use Scenario: Battery-powered CO₂ and VOC sensor node performing periodic air quality sampling and wireless transmission every 5 minutes.

IC Role / Device Role / Timing Role: Central MCU managing ADC acquisition, temperature compensation math, low-power sleep scheduling, and BSL-based firmware updates over UART.

Use Value: 0.1 µA off-mode current extends CR2032 battery life beyond 5 years; 10-bit ADC with internal reference ensures stable ratiometric readings across supply voltage drift.

Use Scenario: Wall-mounted HVAC sensor hub collecting ambient temperature, humidity, and occupancy data using analog and digital sensors.

IC Role / Device Role / Timing Role: System controller interfacing thermistors and capacitive humidity sensors via ADC inputs A0–A4, coordinating timed sampling and I²C sensor reads.

Use Value: Five programmable low-power modes allow dynamic adaptation: LPM3 during idle, LPM0 during ADC conversion, and sub-µA standby between 30-second sampling intervals.

Industrial Current Loop Transmitter

Wireless Remote Meter Reader

Use Scenario: 4–20 mA loop-powered transmitter converting pressure sensor output to standardized analog current signal.

IC Role / Device Role / Timing Role: Precision analog front-end controller acquiring bridge sensor output, performing linearization, and driving DAC or PWM-based current output stage.

Use Value: VREF+/VREF− pins enable true differential reference for 10-bit ADC, achieving <±0.5% full-scale error over −40°C to +85°C without external precision references.

Use Scenario: Solar-charged water/gas meter reader transmitting pulse-count data via sub-GHz RF link every 15 minutes.

IC Role / Device Role / Timing Role: Low-energy coordinator managing optical pulse detection on P1.x, timestamping events with Timer_A3, and triggering RF transmission after accumulation.

Use Value: 16-bit Timer_A3 with three capture registers enables simultaneous monitoring of multiple mechanical meter dials; wake-up from LPM4 in <6 µs captures first pulse edge reliably.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MSP430F1132IDW	8KB flash, same RAM, identical pinout and peripherals; no USART.	Supports larger firmware images (e.g., BLE stack + sensor fusion), but same power profile and I/O count.	Select when firmware size exceeds 4KB or future feature expansion is anticipated without PCB change.
MSP430F1222IDW	28-pin package, adds USART0 (UART/SPI), P3 port (8 I/O), and extra ADC channels (A5–A7).	Enables wired communication (RS-485, SPI sensors) and higher channel-count analog acquisition.	Choose when serial connectivity or >4 ADC inputs are required; requires PCB redesign due to 28-pin footprint.

Compared with MSP430F1122IDW, the MSP430F1132IDW offers double flash capacity in identical packaging for seamless firmware scaling, while the MSP430F1222IDW trades pin count for integrated serial communication and expanded analog input capability - making it suitable for more complex sensor aggregation tasks.

Availability

MSP430F1122IDW is available at Aetrix Electronics and suitable for portable medical monitors, industrial sensor transmitters, and smart building environmental controllers requiring stable component supply and long-term lifecycle support.

Supply support for MSP430F1122IDW 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 expertise in low-power design and industrial-grade reliability.

The MSP430F1122IDW belongs to TI's MSP430x11x2 ultralow-power mixed-signal MCU product line, engineered specifically for battery-operated measurement and sensing applications where nanowatt-level sleep current and fast wake-up are mandatory.

FAQ

What is the maximum operating frequency of the MSP430F1122IDW?

The MSP430F1122IDW supports a maximum CPU clock frequency of 8 MHz, derived from its digitally controlled oscillator (DCO) or external crystal sources. At 1 MHz and 2.2 V, active-mode current is specified at 200 µA - a key benchmark for power-sensitive designs. The 125 ns instruction cycle time confirms consistent timing performance across its operational voltage range (1.8 V to 3.6 V).

Does the MSP430F1122IDW include a hardware USART peripheral?

No, the MSP430F1122IDW does not include a hardware USART. It belongs to the MSP430x11x2 family, which omits the USART0 module found in the MSP430x12x2 series. Communication must be implemented via software UART on GPIO pins or external ICs. This distinction is confirmed in the functional block diagram and peripheral file map sections of the SLAS361D datasheet.

How many analog input channels does the MSP430F1122IDW support?

The MSP430F1122IDW supports five analog input channels (A0 through A4), mapped to pins P2.0, P2.1, P2.2, P2.3, and P2.4 respectively. These channels feed the integrated 10-bit ADC10 module, which also provides dedicated VREF+ and VREF− terminals for flexible reference configuration - enabling both internal and external reference topologies.

What package type is used for the MSP430F1122IDW?

The MSP430F1122IDW is packaged in a 20-pin Plastic Small Outline Wide Body (SOWB) package, designated by the "DW" suffix. This package has a 0.65 mm lead pitch and is RoHS-compliant. Pin assignments match the 20-pin TSSOP (PW) variant electrically, though mechanical dimensions differ - requiring board layout verification before substitution.

Can the MSP430F1122IDW perform ADC conversions without CPU involvement?

Yes, the MSP430F1122IDW's ADC10 module includes a Data Transfer Controller (DTC) that automatically stores conversion results in RAM without CPU execution. When configured for autoscan mode with DTC enabled, up to 16 sequential ADC samples can be acquired and stored - significantly reducing active-mode time and total system power consumption in continuous-sensing applications.

MSP430F1122IDW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Series:: MSP430x1xx

Packaging:: Bulk

Product Status:: Active

Programmable:: Verified

Core Processor:: MSP430 CPU16

Core Size:: 16-Bit

Speed:: 8MHz

Connectivity:: -

Peripherals:: Brown-out Detect/Reset, POR, PWM, WDT

Number of I/O:: 14

Program Memory Size:: 4KB (4K x 8 + 256B)

Program Memory Type:: FLASH

EEPROM Size:: -

RAM Size:: 256 x 8

Voltage - Supply (Vcc/Vdd):: 1.8V ~ 3.6V

Data Converters:: A/D 8x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

MSP430F1122IDW FAQ

1.How can I place an order for MSP430F1122IDW through Aetrix?

Please submit a Request for Quotation (RFQ) for MSP430F1122IDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

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The price and inventory of MSP430F1122IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F1122IDW is usually 5 days.

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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MSP430F1122IDW?

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6.How does Aetrix verify that MSP430F1122IDW is sourced from the original manufacturer or authorized distributors?

All MSP430F1122IDW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MSP430F1122IDW meets industry standards.

7.What is the process for return or replacement of MSP430F1122IDW?

All MSP430F1122IDW units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F1122IDW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MSP430F1122IDW part is unused and in its original packaging.

Return procedure for MSP430F1122IDW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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