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Texas Instruments MSP430F1121IPWR

Name: MSP430F1121IPWR
Brand: Texas Instruments
SKU: MSP430F1121IPWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MSP430F1121IPWR

Manufacturer:: Texas Instruments

Category:: Microcontrollers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: MSP430F1121IPWR.pdf

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

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Product details

Overview

MSP430F1121IPWR 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 achieves active-mode current of 160 μA at 1 MHz/2.2 V, enabling battery-powered sensor systems and RF front ends.

For engineers reviewing the MSP430F1121IPWR datasheet, MSP430F1121IPWR pinout, MSP430F1121IPWR application, or MSP430F1121IPWR equivalent, key selection criteria include flash-based in-system programmability, sub-μA LPM3/LPM4 standby current (0.7 μA / 0.1 μA), 6 μs wake-up time, and integrated slope A/D capability via I/O pins - all in a 20-pin TSSOP package.

Technical Context

The MSP430F1121IPWR implements a 16-bit RISC CPU with seven addressing modes and constant generators for high code efficiency. Its basic clock module supports multiple sources: internal DCO (stabilizes in <6 μs), 32-kHz crystal, external resistor, or high-frequency crystal - enabling flexible low-power timing across operating modes.

It integrates peripheral modules directly accessible via memory-mapped I/O: Timer_A3 with three independent capture/compare registers, Comparator_A for analog signal comparison or slope ADC, and dual 8-bit ports (P1 with 8 I/Os, P2 with 6 I/Os), all supporting edge-selectable interrupts and programmable direction per bit.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	16-bit RISC CPU with 125 ns instruction cycle; register-to-register operations execute in one CPU clock cycle.
Memory	4KB flash + 256B RAM; supports in-system programming via JTAG or BSL UART interface with password protection.
Supply Voltage	1.8 V to 3.6 V; flash programming requires ≥2.7 V, ensuring robust operation across single-cell Li-ion or dual-AA battery systems.
Power Consumption	Active mode: 160 μA @ 1 MHz/2.2 V; LPM3: 0.7 μA; LPM4: 0.1 μA - optimized for multi-year battery life in intermittent-sensing applications.
Wake-Up Time	<6 μs from LPM3/LPM4 to active mode using DCO clock - critical for responsive event-driven sensing without latency penalty.
Timer Resources	16-bit Timer_A3 with three capture/compare registers (TACCR0–2), supporting PWM generation, interval timing, and input capture with interrupt capability per channel.
Analog Function	Comparator_A with two analog inputs (CA0/CA1), output (CAOUT), and slope A/D conversion support using resistive sensors and I/O pins.

Pinout & Package

Package: 20-pin Plastic Thin Shrink Small-Outline Package (TSSOP, PW), body width 4.4 mm, pitch 0.65 mm. Pin 1 marked by dot; thermal pad not present.

Pin/Terminal	Circuit Role	Design Meaning
VSS	Ground reference	Primary digital ground connection; all internal logic and I/O referenced to this node.
P2.5/ROSC	I/O / DCO resistor input	Connects external resistor to set nominal DCO frequency; also functions as general-purpose I/O.
XOUT	Oscillator output	Output terminal of LFXT1 crystal oscillator; requires external crystal or resonator between XIN and XOUT.
VCC	Supply voltage	Main power supply input (1.8–3.6 V); decoupling capacitor required near pin for stable operation.
XIN	Oscillator input	Input terminal of LFXT1 crystal oscillator; accepts 32.768 kHz watch crystal or 450 kHz–8 MHz resonator/crystal.
TEST	JTAG test mode select	Activates JTAG boundary-scan and programming mode when pulled high during reset; connects to JTAG fuse.
RST/NMI	Reset / nonmaskable interrupt	Active-low asynchronous reset input; also serves as NMI source when configured in NMI mode.
P1.7/TA2/TDO/TDI	I/O / Timer_A / JTAG	General-purpose I/O; Timer_A channel 2 compare/output; JTAG test data I/O (TDO or TDI depending on instruction).
P2.0/ACLK	I/O / auxiliary clock output	Outputs ACLK (typically 32.768 kHz) for system timing or external synchronization; configurable as GPIO.
P1.6/TA1/TDI/TCLK	I/O / Timer_A / JTAG	General-purpose I/O; Timer_A channel 1 compare/output; JTAG test data input or test clock input.
NC	No connect	Not internally bonded; must be left unconnected or tied to VSS/VCC per board design rules - no electrical function.
NC	No connect	Not internally bonded; must be left unconnected or tied to VSS/VCC per board design rules - no electrical function.
P1.4/SMCLK/TCK	I/O / subsystem clock / JTAG	General-purpose I/O; outputs SMCLK for peripheral timing; JTAG test clock input.
P1.3/TA2	I/O / Timer_A channel 2	General-purpose I/O; Timer_A channel 2 capture input or compare output - supports PWM or event timing.
P1.2/TA1	I/O / Timer_A channel 1	General-purpose I/O; Timer_A channel 1 capture input or compare output - enables dual-edge PWM or pulse-width measurement.
P1.1/TA0	I/O / Timer_A channel 0	General-purpose I/O; Timer_A channel 0 capture input or compare output; also used for BSL transmit (TXD) in UART mode.
P1.0/TACLK	I/O / Timer_A clock input	External clock input for Timer_A; accepts up to 10 MHz signal - enables precise external event counting or gated timing.
P1.5/TA0/TMS	I/O / Timer_A / JTAG	General-purpose I/O; Timer_A channel 0 compare output; JTAG test mode select input.
P2.1/INCLK	I/O / Timer_A clock input	Secondary external clock input for Timer_A; supports independent clock domain for synchronized capture operations.
P2.2/CAOUT/TA0	I/O / comparator output / Timer_A	Comparator_A output pin; also serves as Timer_A channel 0 capture input (CCI0B) and BSL receive (RXD).
P2.3/CA0/TA1	I/O / comparator input / Timer_A	Comparator_A positive input; also Timer_A channel 1 capture input (CCI1B) - enables analog threshold detection with timer-triggered response.
P2.4/CA1/TA2	I/O / comparator input / Timer_A	Comparator_A negative input; also Timer_A channel 2 capture input (CCI2B) - supports differential analog monitoring with event capture.

Key Features

Feature	Design Value
Ultralow-power operation	0.1 μA in LPM4 (RAM retention) enables multi-year battery life in wireless sensor nodes without duty-cycling overhead.
Integrated slope A/D conversion	Uses I/O pins and Comparator_A to perform analog-to-digital conversion on resistive sensors - eliminates need for external ADC in simple sensing applications.
Fast wake-up from low-power modes	<6 μs wake-up using internal DCO allows immediate response to external interrupts while maintaining ultra-low average current.
In-system programmability	Flash memory programmed via JTAG or UART-based BSL - enables field firmware updates and eliminates need for external programmers in production.
Dual clock domains	Independent ACLK (32.768 kHz), SMCLK (up to 8 MHz), and MCLK (CPU clock) allow concurrent low-power timing and high-speed processing.
Hardware-peripheral interrupt prioritization	16 interrupt vectors with fixed priority levels (0–15) enable deterministic real-time response to analog events, timer overflows, and I/O transitions.

Applications

Temperature Sensor Node	Wireless RF Front End
Use Scenario: Battery-powered remote temperature monitoring using thermistor or RTD connected to P2.3/P2.4. IC Role / Device Role / Timing Role: MSP430F1121IPWR performs slope A/D conversion via Comparator_A and Timer_A, stores calibrated values in flash, and wakes periodically to transmit via external RF IC. Use Value: Eliminates external ADC and precision reference; 0.1 μA LPM4 current extends battery life beyond 5 years in 1-minute sampling intervals.	Use Scenario: Standalone 433 MHz or 868 MHz sub-GHz RF sensor front end with wake-on-radio activity. IC Role / Device Role / Timing Role: MSP430F1121IPWR monitors RF IC interrupt lines via P1.x, processes received packets, and controls sleep/wake cycles using Timer_A and LPM3. Use Value: Sub-μA standby current ensures RF IC remains powered while MCU sleeps, reducing total system quiescent current below 1 μA.
Portable Medical Sensor	Industrial Asset Monitor
Use Scenario: Wearable pulse oximeter or ECG front end measuring analog bio-signals with low-noise amplification. IC Role / Device Role / Timing Role: MSP430F1121IPWR uses Comparator_A for analog signal conditioning and Timer_A for precise sampling intervals, then transmits processed data via UART to host MCU. Use Value: Integrated comparator and timer reduce BOM count; 1.8 V minimum supply supports single-cell coin-cell operation in compact form factors.	Use Scenario: Vibration or humidity monitor mounted on factory equipment with periodic self-test and alert transmission. IC Role / Device Role / Timing Role: MSP430F1121IPWR reads analog sensor outputs, executes diagnostic algorithms in flash, and triggers RF alert only upon threshold violation. Use Value: Flash-based firmware allows post-deployment calibration updates; 4KB program space accommodates sensor fusion and secure boot logic.

Temperature Sensor Node

Wireless RF Front End

Use Scenario: Battery-powered remote temperature monitoring using thermistor or RTD connected to P2.3/P2.4.

IC Role / Device Role / Timing Role: MSP430F1121IPWR performs slope A/D conversion via Comparator_A and Timer_A, stores calibrated values in flash, and wakes periodically to transmit via external RF IC.

Use Value: Eliminates external ADC and precision reference; 0.1 μA LPM4 current extends battery life beyond 5 years in 1-minute sampling intervals.

Use Scenario: Standalone 433 MHz or 868 MHz sub-GHz RF sensor front end with wake-on-radio activity.

IC Role / Device Role / Timing Role: MSP430F1121IPWR monitors RF IC interrupt lines via P1.x, processes received packets, and controls sleep/wake cycles using Timer_A and LPM3.

Use Value: Sub-μA standby current ensures RF IC remains powered while MCU sleeps, reducing total system quiescent current below 1 μA.

Portable Medical Sensor

Industrial Asset Monitor

Use Scenario: Wearable pulse oximeter or ECG front end measuring analog bio-signals with low-noise amplification.

IC Role / Device Role / Timing Role: MSP430F1121IPWR uses Comparator_A for analog signal conditioning and Timer_A for precise sampling intervals, then transmits processed data via UART to host MCU.

Use Value: Integrated comparator and timer reduce BOM count; 1.8 V minimum supply supports single-cell coin-cell operation in compact form factors.

Use Scenario: Vibration or humidity monitor mounted on factory equipment with periodic self-test and alert transmission.

IC Role / Device Role / Timing Role: MSP430F1121IPWR reads analog sensor outputs, executes diagnostic algorithms in flash, and triggers RF alert only upon threshold violation.

Use Value: Flash-based firmware allows post-deployment calibration updates; 4KB program space accommodates sensor fusion and secure boot logic.

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
MSP430F1101IPWR	1KB flash, 128B RAM, same package and core peripherals - lacks 2KB additional flash and 128B RAM of MSP430F1121IPWR.	Suitable for simpler sensor firmware with minimal code footprint; insufficient for applications requiring bootloader, encryption, or multi-sensor fusion.	Select when firmware size ≤900 bytes and RAM usage ≤110B; verify Timer_A and Comparator_A register compatibility in SLAU049.
MSP430F1132IPWR	8KB flash, 256B RAM, identical pinout and peripheral set - adds 4KB flash and enhanced BSL features vs. MSP430F1121IPWR.	Supports larger firmware images including OTA update stacks and advanced diagnostics; maintains full backward compatibility in hardware design.	Choose for future-proofing or when adding BLE stack, secure boot, or extended calibration tables - no PCB changes required.

Compared with MSP430F1101IPWR, the MSP430F1121IPWR provides double flash and RAM for complex sensor algorithms, while MSP430F1132IPWR extends scalability without layout revision - making MSP430F1121IPWR optimal for cost-sensitive, mid-complexity embedded sensing where 4KB flash is sufficient and verified.

Availability

MSP430F1121IPWR is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable medical devices, and industrial asset monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MSP430F1121IPWR 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 for industrial, automotive, and consumer applications.

The MSP430F1121IPWR belongs to the MSP430x1xx family - designed specifically for ultralow-power mixed-signal applications where extended battery life, integrated analog peripherals, and fast wake-up from deep sleep are essential.

FAQ

What is the maximum operating frequency of the MSP430F1121IPWR at 3.6 V?

The MSP430F1121IPWR 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 and using the internal DCO or external crystal oscillator. The CPU instruction cycle time is 125 ns at this rate, enabling real-time processing of sensor data without external acceleration.

Does the MSP430F1121IPWR support in-system programming via UART?

Yes, the MSP430F1121IPWR supports in-system programming via its built-in Bootstrap Loader (BSL), which uses UART communication on P1.1 (TXD) and P2.2 (RXD). The BSL is protected by a user-defined password and enables field firmware updates without JTAG hardware - a key feature confirmed in SLAA089 and the device's functional description.

What are the absolute maximum ratings for VCC and I/O pins on the MSP430F1121IPWR?

The absolute maximum rating for VCC is −0.3 V to 4.1 V relative to VSS. For any I/O pin, voltage must remain within −0.3 V to VCC+0.3 V. Exceeding these limits risks permanent damage. These values are defined in the SLAS241I datasheet Section 14 and apply to all operating conditions - including programming and reset sequences.

Can the MSP430F1121IPWR perform analog-to-digital conversion without an external ADC?

Yes, the MSP430F1121IPWR can perform slope analog-to-digital conversion using its on-chip Comparator_A module and Timer_A. By charging a capacitor through a resistive sensor and measuring time-to-threshold with Timer_A, it achieves effective 10–12 bit resolution - a documented capability used in thermistor and battery-voltage monitoring applications per SLAS241I Section 11.

Which low-power modes does the MSP430F1121IPWR support, and what is the current draw in LPM4?

The MSP430F1121IPWR supports six operating modes: Active Mode and five low-power modes (LPM0–LPM4). In LPM4 - the deepest sleep state with ACLK disabled and crystal stopped - typical current draw is 0.1 μA at 25°C and 2.2 V/3 V, as measured under recommended conditions in SLAS241I Electrical Characteristics Table.

MSP430F1121IPWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Series:: MSP430x1xx

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Programmable:: Not 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:

MSP430F1121IPWR FAQ

1.How can I place an order for MSP430F1121IPWR through Aetrix?

Please submit a Request for Quotation (RFQ) for MSP430F1121IPWR 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 MSP430F1121IPWR reliable?

The price and inventory of MSP430F1121IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F1121IPWR is usually 5 days.

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Once your MSP430F1121IPWR 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 MSP430F1121IPWR?

For technical support, including MSP430F1121IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F1121IPWR requirements.

6.How does Aetrix verify that MSP430F1121IPWR is sourced from the original manufacturer or authorized distributors?

All MSP430F1121IPWR 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 MSP430F1121IPWR meets industry standards.

7.What is the process for return or replacement of MSP430F1121IPWR?

All MSP430F1121IPWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F1121IPWR, 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 MSP430F1121IPWR part is unused and in its original packaging.

Return procedure for MSP430F1121IPWR:

1.Submit a request within 90 days.

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

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