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Texas Instruments MSP430F1121IDW
- Part No.:
- MSP430F1121IDW
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F1121IDW.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
MSP430F1121IDW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 4KB flash memory, 256B RAM, a 16-bit Timer_A with three capture/compare registers, an on-chip analog comparator, and 14 programmable I/O pins. It operates from 1.8 V to 3.6 V and supports wake-up from standby mode in under 6 μs - ideal for battery-powered sensor nodes and portable measurement systems.
For engineers reviewing the MSP430F1121IDW datasheet, MSP430F1121IDW pinout, MSP430F1121IDW application, or MSP430F1121IDW equivalent, key selection criteria include active-mode current at 1 MHz (300 μA typ. @ 3 V), LPM3 standby current (0.7 μA), flash-based in-system programmability, and compatibility with 32-kHz crystal or internal DCO clock sources.
Technical Context
The MSP430F1121IDW implements a 16-bit RISC CPU with seven addressing modes and constant generators for high code efficiency. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support (ACLK), and selectable SMCLK/MCLK sources - enabling sub-6-μs wake-up from LPM3/LPM4.
It features two 8-bit I/O ports (P1 with 8 pins, P2 with 6 exposed pins), Timer_A3 with three independent capture/compare channels, and Comparator_A supporting slope A/D conversion and battery monitoring. All peripherals are memory-mapped and accessible via standard instructions without special opcodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 125 ns instruction cycle time and register-to-register execution in one cycle |
| Memory | 4KB flash + 256B RAM - enables field-upgradable firmware and data retention during low-power sleep |
| Supply Voltage | 1.8 V to 3.6 V - supports single-cell Li-ion, coin-cell, and regulated 3.3 V rails without level-shifting |
| Active Current | 300 μA typical at 1 MHz / 3 V - allows >1-year operation on CR2032 in duty-cycled sensor applications |
| Standby Current | 0.7 μA in LPM3 (ACLK active) - sustains real-time clock and interrupt-waiting with minimal battery drain |
| Wake-up Time | <6 μs from LPM3/LPM4 - meets tight timing constraints in responsive wireless sensor wake-up protocols |
| Timer Resources | Timer_A3 with three capture/compare registers - supports simultaneous PWM generation, input capture, and interval timing |
Pinout & Package
Package: 20-pin Plastic Small-Outline Wide Body (SOWB), DW suffix, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | Main supply input (1.8–3.6 V); decoupling capacitor required near pin |
| VSS | Ground reference | Digital ground return; must be connected to system GND plane |
| RST/NMI | Reset or nonmaskable interrupt | Active-low reset input; also serves as NMI source for critical fault handling |
| XIN / XOUT | Crystal oscillator terminals | Supports 32.768 kHz watch crystal for precise real-time clock operation |
| P1.0–P1.7 | Port 1 I/O | 8-bit bidirectional port with individually configurable direction, pullup/down, and edge-selectable interrupts |
| P2.0–P2.5 | Port 2 I/O | 6-bit bidirectional port; includes ACLK output, INCLK input, and comparator inputs CA0/CA1 |
| TEST | JTAG test mode select | Enables JTAG debugging and flash programming; tied high during normal operation |
| P2.5/ROSC | DCO resistor input | Connects external resistor to set nominal DCO frequency - enables crystal-free operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-power operation | 0.1 μA off-mode (RAM retention), 0.7 μA LPM3 - extends battery life in intermittent-sensing applications |
| On-chip analog comparator | Supports slope A/D conversion and battery voltage supervision without external components |
| Flash memory with BSL | Field-programmable via UART using bootstrap loader - eliminates need for JTAG hardware in production |
| Five low-power modes | LPM0–LPM4 with configurable clock gating - allows fine-grained power/performance trade-offs per task |
| 16-bit Timer_A3 | Three independent capture/compare registers - enables concurrent PWM, input capture, and time-stamping |
| Integrated DCO | Stabilizes in <6 μs - enables rapid wake-up from deep sleep without external crystal startup delay |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity node transmitting data via sub-GHz RF transceiver on scheduled intervals. IC Role / Device Role / Timing Role: Main controller managing sensor readout, ADC conversion, data processing, and RF interface timing via Timer_A3 and ACLK-synchronized interrupts. Use Value: 0.7 μA LPM3 current enables multi-year operation on CR2032; integrated comparator reduces BOM count for battery voltage monitoring. |
Use Scenario: Wearable pulse oximeter sampling analog photodiode signals and calculating SpO₂ in real time. IC Role / Device Role / Timing Role: Mixed-signal processor executing slope A/D conversion using Comparator_A and Timer_A, while maintaining accurate sample timing via 32-kHz crystal. Use Value: 16-bit RISC core delivers sufficient MIPS for real-time signal processing; 4KB flash accommodates algorithm updates over BSL. |
| Smart Utility Meter | Industrial Data Logger |
|
Use Scenario: Tamper-resistant electricity meter logging consumption data hourly and reporting via PLC or NB-IoT. IC Role / Device Role / Timing Role: System-on-chip handling metrology front-end interface, secure flash storage, RTC, and communication stack timing. Use Value: Flash memory with security fuse prevents firmware tampering; LPM4 mode (0.1 μA) preserves RAM state during long idle periods between reads. |
Use Scenario: Ruggedized environmental logger recording temperature, pressure, and humidity every 10 minutes in remote locations. IC Role / Device Role / Timing Role: Autonomous controller managing sensor excitation, analog signal conditioning via comparator, and timestamped flash writes. Use Value: Internal DCO enables reliable wake-up without crystal aging concerns; 256B RAM retains buffer data across power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F2131IPW | 2KB flash, 256B RAM, same 20-pin TSSOP package; adds USCI UART/SPI/I²C peripheral | Requires serial communication with host or sensors; higher active current (250 μA @ 1 MHz) | Choose when UART or SPI interface is mandatory and flash size can be reduced |
| MSP430G2553IPW20 | 16KB flash, 512B RAM, enhanced Timer_A, built-in USB-like BSL; 20-pin TSSOP | Supports larger firmware, more complex algorithms, and simplified programming via UART | Prefer for new designs needing scalability, debug flexibility, and future-proof memory headroom |
Compared with MSP430F1121IDW, the MSP430F2131IPW trades flash capacity for integrated serial interfaces, while the MSP430G2553IPW20 offers significantly more memory and modern BSL - both require layout review due to differing peripheral mappings and power profiles.
Availability
MSP430F1121IDW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and smart utility meters requiring stable component supply across extended product lifecycles.
Supply support for MSP430F1121IDW 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 MSP430x11x1(A) product line targets ultralow-power portable measurement systems - designed to maximize battery life through aggressive power gating, fast wake-up, and integrated analog peripherals.
FAQ
What is the maximum operating frequency of the MSP430F1121IDW at 3.6 V?
The MSP430F1121IDW supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V, as specified in the recommended operating conditions. This applies when executing code from flash memory. The device's 16-bit RISC architecture delivers 125 ns instruction cycle time at this rate, enabling deterministic real-time response in time-critical sensor control loops.
Does the MSP430F1121IDW support in-system programming without external hardware?
Yes, the MSP430F1121IDW includes a factory-programmed Bootstrap Loader (BSL) that enables in-system programming via UART using only P1.1 (TXD) and P2.2 (RXD). No external programmer or JTAG interface is required for field firmware updates, reducing production and maintenance costs. Password protection ensures secure access to flash memory.
What low-power modes are available on the MSP430F1121IDW and how do they differ?
The MSP430F1121IDW provides six operating modes: Active Mode and five low-power modes (LPM0–LPM4). LPM3 retains ACLK for RTC operation at 0.7 μA, while LPM4 disables all clocks including ACLK and draws just 0.1 μA with RAM retention. Each mode selectively gates MCLK, SMCLK, and ACLK, and disables DCO circuitry to minimize leakage - allowing precise power/performance tuning per application phase.
Can the MSP430F1121IDW perform analog-to-digital conversion without an external ADC?
Yes, the MSP430F1121IDW uses its integrated Comparator_A module with Timer_A to implement slope-type analog-to-digital conversion. By charging a capacitor through a known current and measuring time-to-compare threshold, it achieves effective 10–12 bit resolution without external components - ideal for resistive sensors like thermistors or potentiometers.
What is the function of the TEST pin on the MSP430F1121IDW?
The TEST pin on the MSP430F1121IDW selects JTAG test mode for debugging and flash programming. When pulled high during reset, it enables JTAG interface on Port 1 pins (TCK, TMS, TDI, TDO). It is also connected to the JTAG security fuse - blowing this fuse permanently disables JTAG access, protecting firmware intellectual property in deployed devices.
MSP430F1121IDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Programmable:
- Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- POR, 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:
- Slope A/D
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F1121IDW FAQ
1.How can I place an order for MSP430F1121IDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F1121IDW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MSP430F1121IDW reliable?
The price and inventory of MSP430F1121IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F1121IDW is usually 5 days.
3.What payment methods are accepted for MSP430F1121IDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F1121IDW transactions.
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4.How is shipping managed for MSP430F1121IDW?
MSP430F1121IDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F1121IDW order is processed, you will receive an email with the shipment details and tracking number.
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 MSP430F1121IDW?
For technical support, including MSP430F1121IDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F1121IDW requirements.
6.How does Aetrix verify that MSP430F1121IDW is sourced from the original manufacturer or authorized distributors?
All MSP430F1121IDW 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 MSP430F1121IDW meets industry standards.
7.What is the process for return or replacement of MSP430F1121IDW?
All MSP430F1121IDW units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F1121IDW, 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 MSP430F1121IDW part is unused and in its original packaging.
Return procedure for MSP430F1121IDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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