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Texas Instruments MSP430F1121AIDWR
- Part No.:
- MSP430F1121AIDWR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F1121AIDWR.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,593
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Product details
Overview
MSP430F1121AIDWR 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 MSP430F1121AIDWR datasheet, MSP430F1121AIDWR pinout, MSP430F1121AIDWR application, or MSP430F1121AIDWR equivalent, key selection criteria include active-mode current at 1 MHz (≤350 μA @ 3 V), LPM3 standby current (≤1.9 μA @ 85°C), flash programming voltage requirement (≥2.7 V), and 20-pin DW package compatibility with SOWB footprint.
Technical Context
The MSP430F1121AIDWR implements a 16-bit RISC CPU with constant generators and seven addressing modes, enabling single-cycle register operations. Its basic clock module integrates a digitally controlled oscillator (DCO), 32-kHz crystal support, and selectable internal resistors - all optimized for sub-μA low-power modes including LPM0–LPM4.
Peripherals are memory-mapped and accessible via standard instructions: Timer_A3 provides three independent capture/compare channels with interrupt capability; Comparator_A enables slope A/D conversion and battery monitoring; and dual 8-bit ports (P1 with 8 pins, P2 with 6 exposed pins) support edge-selectable interrupts and JTAG debugging via dedicated P1 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 125 ns instruction cycle time and 16 general-purpose registers |
| Memory | 4KB + 256B flash program memory, 256B RAM - supports in-system programming via JTAG or BSL UART |
| Supply Voltage | 1.8 V to 3.6 V operating range; flash programming requires ≥2.7 V |
| Active Mode Current | ≤350 μA at 1 MHz / 3 V - enables >10-year coin-cell operation in periodic sensing applications |
| Low-Power Mode LPM3 | ≤1.9 μA at 85°C with ACLK active - sustains real-time clock and comparator wake-up capability |
| Wake-Up Time | <6 μs from LPM3/LPM4 to active mode - critical for responsive event-driven sensor firmware |
| I/O Pins | 14 total: P1.0–P1.7 (8 pins), P2.0–P2.5 (6 pins); all support interrupt-on-change and Schmitt-trigger inputs |
Pinout & Package
Package: 20-pin Plastic Small-Outline Wide Body (SOWB), DW suffix, body width 7.5 mm, JEDEC MS-013AC compliant. Pin 1 marked by notch or dot; thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TACLK | General-purpose I/O / Timer_A clock input | Configurable as external timer clock source or digital I/O; supports high-impedance input during LPM |
| P1.1/TA0/TMS | Timer_A channel 0 / JTAG test mode select | Dual-role pin: TA0 compare/capture signal or JTAG TMS input; shared function requires careful reset-state management |
| P1.2/TA1/TDI/TCLK | Timer_A channel 1 / JTAG test data input or clock | Enables debug interface reuse of peripheral pins; TDI/TCLK selection controlled by JTAG instruction |
| P1.3/TA2/TDO/TDI | Timer_A channel 2 / JTAG test data output or input | Supports boundary-scan and flash programming without additional debug headers |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Provides SMCLK for peripherals or synchronizes JTAG communication; driven only when enabled |
| P1.5/TA0/TMS | Timer_A channel 0 output / JTAG test mode select | Alternate TA0 output path; avoids contention with P1.1 when both TA0 functions required |
| P1.6/TA1/TDI/TCLK | Timer_A channel 1 output / JTAG test data input or clock | Redundant JTAG path enhances reliability in noisy environments |
| P1.7/TA2/TDO/TDI | Timer_A channel 2 output / JTAG test data output or input | Final JTAG data pin; TDO active during readback, TDI during programming |
| P2.0/ACLK | Auxiliary clock output | Drives 32-kHz crystal oscillator output to external circuitry or other MCUs |
| P2.1/INCLK | Timer_A internal clock input | Accepts DCO or ACLK as Timer_A clock source - enables precise timing without external components |
| P2.2/CAOUT/TA0 | Comparator_A output / Timer_A channel 0 input | Direct comparator-to-timer coupling enables zero-latency slope A/D conversion |
| P2.3/CA0/TA1 | Comparator_A positive input / Timer_A channel 1 input | Allows analog signal routing from external sensors to comparator and timer simultaneously |
| P2.4/CA1/TA2 | Comparator_A negative input / Timer_A channel 2 input | Supports differential analog measurements and hysteresis control via CA0/CA1 pairing |
| P2.5/ROSC | Resistor oscillator input | Connects external resistor to set DCO nominal frequency - eliminates need for crystal in cost-sensitive designs |
| RST/NMI | Reset or nonmaskable interrupt input | Pull-up required externally; triggers power-on reset and fault recovery sequences |
| TEST | JTAG test mode enable | High-active signal that activates JTAG pins on Port 1; tied to security fuse for programming lock |
| VCC | Supply voltage | 1.8–3.6 V input; decoupling capacitor mandatory within 10 mm of pin |
| VSS | Ground reference | Primary return path for all digital and analog circuits; low-impedance connection essential |
| XIN | Crytal oscillator input | Accepts 32.768 kHz watch crystal or 1–8 MHz high-frequency crystal per configuration |
| XOUT | Crytal oscillator output | Drives crystal in parallel-resonant mode; load capacitance must match crystal spec |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-power operation | LPM4 current ≤0.5 μA at 25°C enables multi-year battery life in wireless sensor endpoints |
| Integrated analog comparator | Supports precision slope A/D conversion without external ADC - reduces BOM count and PCB area |
| On-chip flash memory | 4KB flash with 256B information memory allows field firmware updates and parameter storage |
| Bootstrap loader (BSL) | UART-based flash programming via P1.1/P2.2 eliminates need for JTAG hardware programmer |
| Five configurable low-power modes | LPM0–LPM4 provide granular trade-offs between wake-up latency, current draw, and clock domain retention |
| 16-bit Timer_A3 module | Three independent capture/compare registers enable simultaneous PWM generation, input capture, and interval timing |
Applications
| Wireless Sensor Node | Battery-Powered Data Logger |
|---|---|
Use Scenario: Remote environmental monitoring using thermistor, photodiode, and humidity sensors with periodic BLE transmission. IC Role / Device Role / Timing Role: Central controller executing sensor polling, slope A/D conversion via Comparator_A, RTC maintenance via ACLK, and low-power scheduling. Use Value: 0.1 μA off-mode current preserves CR2032 battery for >5 years; <6 μs wake-up ensures timely response to threshold events. |
Use Scenario: Industrial equipment condition monitoring with vibration, temperature, and voltage sampling every 10 seconds. IC Role / Device Role / Timing Role: Standalone data acquisition unit storing timestamped samples in RAM, then writing batches to flash upon host request. Use Value: 4KB flash accommodates firmware + 2 weeks of 10-second logs; LPM3 mode maintains ACLK for accurate timekeeping. |
| Portable Medical Device | Smart Meter Sensor Interface |
Use Scenario: Handheld pulse oximeter requiring analog front-end signal conditioning and LED drive timing. IC Role / Device Role / Timing Role: Mixed-signal controller managing red/IR LED timing via Timer_A PWM, analog comparator for photodiode signal detection, and user interface I/O. Use Value: Integrated comparator eliminates external op-amp; 14 GPIOs support button, LED, and display interface without expansion logic. |
Use Scenario: Electricity meter auxiliary sensor board measuring neutral current, temperature, and tamper detection. IC Role / Device Role / Timing Role: Secondary MCU handling isolated analog inputs, performing slope A/D on shunt voltage, and communicating results via SPI to main processor. Use Value: 1.8 V minimum supply enables direct connection to meter's 2.4 V rail; Schmitt-trigger inputs tolerate noisy industrial environments. |
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 |
|---|---|---|---|
| MSP430F1101AIDW | 1KB flash, 128B RAM, same 20-pin DW package and peripheral set | Lower memory capacity limits firmware complexity and data buffering depth | Select when application firmware fits in 1KB and RAM usage stays below 128B - reduces cost without sacrificing low-power behavior |
| MSP430F1132IDW | 8KB flash, 256B RAM, added 10-bit SAR ADC (not present in MSP430F1121AIDWR) | Enables higher-precision analog measurements without external ADC but increases code size overhead | Choose when design requires integrated ADC resolution > comparator-based slope A/D and has space for larger firmware image |
Compared with MSP430F1121AIDWR, the MSP430F1101AIDW offers identical low-power performance and pinout at reduced memory cost, while the MSP430F1132IDW trades comparator-centric analog flexibility for higher-resolution ADC capability - making it suitable for applications where absolute voltage accuracy outweighs slope-conversion efficiency.
Availability
MSP430F1121AIDWR is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, and portable medical devices requiring stable component supply across extended production lifecycles.
Supply support for MSP430F1121AIDWR 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 over 50 years of innovation in low-power microcontrollers.
The MSP430x11x1(A) product line was designed specifically for ultralow-power portable measurement applications, emphasizing rapid wake-up, multiple sleep modes, and integrated analog peripherals to minimize external component count.
FAQ
What is the maximum system clock frequency supported by the MSP430F1121AIDWR?
The MSP430F1121AIDWR supports a maximum MCLK frequency of 8 MHz at 3.6 V supply voltage. At 1.8 V, the guaranteed maximum is 4.15 MHz. This limit is enforced by the internal DCO and basic clock module design - exceeding it may cause instruction execution errors or peripheral timing violations. The MSP430F1121AIDWR does not support external high-frequency crystals beyond 8 MHz in XT1 mode.
Does the MSP430F1121AIDWR include a hardware ADC?
No, the MSP430F1121AIDWR does not include a successive-approximation or sigma-delta ADC. It features an analog comparator (Comparator_A) that supports slope-type analog-to-digital conversion using Timer_A - requiring external RC network and firmware implementation. For integrated ADC functionality, consider the MSP430F1132IDW, which adds a 10-bit SAR ADC not present in the MSP430F1121AIDWR.
Can the MSP430F1121AIDWR be programmed without a JTAG debugger?
Yes, the MSP430F1121AIDWR supports UART-based in-system programming via its built-in Bootstrap Loader (BSL), using P1.1 (TX) and P2.2 (RX) pins. This eliminates the need for JTAG hardware when initial firmware loading or field updates are performed - provided the BSL password is known and the device is not locked. The MSP430F1121AIDWR BSL operates at standard baud rates up to 9600 bps.
What are the valid operating temperature and voltage ranges for the MSP430F1121AIDWR?
The MSP430F1121AIDWR is rated for operation from −40°C to +85°C ambient temperature and 1.8 V to 3.6 V supply voltage during program execution. Flash programming requires a minimum VCC of 2.7 V. Operation outside these ranges - such as at 1.7 V or 90°C - is not guaranteed and may result in unpredictable behavior, increased current draw, or memory corruption in the MSP430F1121AIDWR.
How many I/O pins does the MSP430F1121AIDWR expose in the DW package?
The MSP430F1121AIDWR in the 20-pin DW (SOWB) package exposes 14 digital I/O pins: eight on Port 1 (P1.0–P1.7) and six on Port 2 (P2.0–P2.5). Although Port 2 has eight internal bits, only P2.0 through P2.5 are bonded out. All 14 pins support interrupt-on-change, Schmitt-trigger inputs, and configurable pull-up/down resistors - confirmed in the SLAS241I datasheet for the MSP430F1121AIDWR.
MSP430F1121AIDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
MSP430F1121AIDWR FAQ
1.How can I place an order for MSP430F1121AIDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F1121AIDWR 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 MSP430F1121AIDWR reliable?
The price and inventory of MSP430F1121AIDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F1121AIDWR is usually 5 days.
3.What payment methods are accepted for MSP430F1121AIDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F1121AIDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F1121AIDWR?
MSP430F1121AIDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F1121AIDWR 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 MSP430F1121AIDWR?
For technical support, including MSP430F1121AIDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F1121AIDWR requirements.
6.How does Aetrix verify that MSP430F1121AIDWR is sourced from the original manufacturer or authorized distributors?
All MSP430F1121AIDWR 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 MSP430F1121AIDWR meets industry standards.
7.What is the process for return or replacement of MSP430F1121AIDWR?
All MSP430F1121AIDWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F1121AIDWR, 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 MSP430F1121AIDWR part is unused and in its original packaging.
Return procedure for MSP430F1121AIDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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