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Texas Instruments MSP430F122IDW
- Part No.:
- MSP430F122IDW
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F122IDW.pdf
- Description:
- IC MCU 16BIT 4KB FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
MSP430F122IDW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 4KB Flash + 256B RAM, 22 I/O pins, and integrated Timer_A3 with three capture/compare registers. It operates from 1.8 V to 3.6 V, achieves 200 μA active current at 1 MHz/2.2 V, and supports UART/SPI via USART0 - ideal for battery-powered sensor nodes requiring fast wake-up (<6 μs) and analog signal conditioning.
For engineers reviewing the MSP430F122IDW datasheet, MSP430F122IDW pinout, MSP430F122IDW application, or MSP430F122IDW equivalent, key selection criteria include its TSSOP-28 package compatibility, 32 kHz crystal support for real-time clocking, comparator_A-enabled slope A/D conversion, and JTAG/debug capability via TEST/P1.x pins.
Technical Context
The MSP430F122IDW implements a 16-bit CPU with constant generators and seven addressing modes, enabling single-cycle register operations and high code efficiency. Its basic clock module integrates a digitally controlled oscillator (DCO), 32 kHz watch crystal input (XIN/XOUT), and external resistor tuning (P2.5/ROSC) for sub-6 μs wake-up from LPM3/LPM4.
Peripheral integration includes a 16-bit Timer_A3 with three independent capture/compare registers (TA0/TA1/TA2), a dual-input analog comparator (CA0/CA1) supporting battery monitoring and resistive sensor A/D, and USART0 configurable as UART or SPI - all accessible via memory-mapped SFRs in the 0x0000–0x01FF address space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 general-purpose registers and constant generators - enables efficient C code execution and low-cycle-count ISR handling. |
| Memory | 4KB Flash + 256B RAM - sufficient for compact firmware with sensor data processing and serial protocol stacks. |
| Supply Voltage | 1.8 V to 3.6 V - supports direct operation from single Li-ion, coin cell, or regulated 3.3 V rails without level shifting. |
| Active Current | 200 μA at 1 MHz, 2.2 V - enables multi-year battery life in periodic wake-up sensor applications. |
| Wake-up Time | <6 μs from LPM3/LPM4 - allows rapid response to external interrupts while maintaining ultralow standby power (0.7 μA). |
| Timer Resources | Timer_A3 with three capture/compare registers (TACCR0–TACCR2) - supports PWM generation, input capture, and interval timing simultaneously. |
| Communication | USART0 configurable as UART (UTXD0/URXD0) or SPI (SIMO0/SOMI0/UCLK0/STE0) - eliminates need for external protocol translators. |
Pinout & Package
Package: 28-pin Plastic Thin Shrink Small-Outline Package (TSSOP), body width 4.4 mm, lead pitch 0.65 mm, JEDEC MO-153 compliant. Thermal pad not present; standard PCB land pattern recommended per TI SLAZ197.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TACLK | Timer_A clock input | Accepts external clock source for Timer_A; also functions as general-purpose I/O with interrupt capability. |
| P2.2/CAOUT/TA0 | Comparator output / Timer_A channel 0 | Delivers comparator result directly to TA0 capture logic or drives external circuitry; supports BSL receive. |
| P3.4/UTXD0 & P3.5/URXD0 | UART transmit/receive | Dedicated full-duplex UART pins - enable host communication without software bit-banging or external transceivers. |
| RST/NMI | Reset / nonmaskable interrupt | Hardware reset initiation and NMI event handling; double-function pin requires external pull-up for reliable reset assertion. |
| TEST | JTAG test mode select | Enables JTAG debugging and programming when driven high during power-up; shares pin with P1.7 in normal operation. |
| XIN / XOUT | Crystal oscillator input/output | Supports 32.768 kHz watch crystal for precise real-time clock; internal load capacitors eliminate need for external caps in most designs. |
Key Features
| Feature | Design Value |
|---|---|
| Five low-power modes (LPM0–LPM4) | Enables dynamic power scaling: LPM4 draws only 0.1 μA with RAM retention, extending battery life in intermittent-sensing applications. |
| On-chip analog comparator (Comparator_A) | Performs precision slope A/D on resistive sensors (e.g., thermistors) without external ADC; supports battery voltage supervision. |
| Bootstrap loader (BSL) | Allows field firmware updates via UART using P1.1 (TX) and P2.2 (RX) - no JTAG hardware required for production programming. |
| Digital-controlled oscillator (DCO) | Stabilizes in <6 μs from any low-power mode - ensures deterministic timing recovery for time-critical sensor sampling. |
| Programmable code protection | Security fuse prevents unauthorized read-out of Flash contents - protects proprietary algorithms in deployed sensor endpoints. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity node transmitting data via UART to BLE module. IC Role / Device Role / Timing Role: Central controller managing sensor reads, slope A/D conversion via Comparator_A, UART framing, and LPM3 sleep scheduling. Use Value: 0.7 μA standby current and sub-6 μs wake-up minimize duty-cycle overhead, enabling >5-year CR2032 operation at 1-min reporting intervals. |
Use Scenario: Handheld pulse oximeter with analog front-end and OLED display interface. IC Role / Device Role / Timing Role: Signal processor acquiring photodiode data via comparator-based slope A/D, driving display via GPIO, and managing button interrupts. Use Value: Integrated 16-bit Timer_A3 generates precise LED drive timing and sample intervals without external timers, reducing BOM count. |
| Smart Utility Meter Interface | Industrial Condition Monitor |
|
Use Scenario: Tamper-detection module interfacing with reed switches and sending alerts over RS-232. IC Role / Device Role / Timing Role: Low-power event detector using P1/P2 edge-triggered interrupts and UART transmission via USART0. Use Value: Schmitt-trigger inputs (VIT+ = 1.5 V typ @ 3 V) reject EMI on long leads; programmable interrupt edge select avoids false triggers. |
Use Scenario: Vibration sensor node mounted on motor housing, logging data to EEPROM over I²C. IC Role / Device Role / Timing Role: Data aggregator reading analog accelerometer output via comparator_A, timestamping samples using 32 kHz crystal, and buffering before transmission. Use Value: ACLK sourced from 32.768 kHz crystal provides accurate time-stamping across temperature range (−40°C to 85°C) without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F123IDW | 8KB Flash + 256B RAM; identical peripherals, package, and pinout. | Required when firmware exceeds 4KB or future expansion headroom is needed. | Select MSP430F123IDW if code size approaches 3.5KB or bootloader + application partitioning is planned. |
| MSP430F2274IRHBT | QFN-32 package; 16KB Flash, 1KB RAM; enhanced USCI module (UART/SPI/I²C); 10-bit ADC. | Suitable for designs needing I²C connectivity, higher memory, or smaller footprint than TSSOP-28. | Choose MSP430F2274IRHBT when adding I²C sensors or requiring >4KB code space - note different pinout and no direct replacement. |
Compared with MSP430F122IDW, MSP430F123IDW offers drop-in Flash capacity upgrade within same TSSOP-28 package, while MSP430F2274IRHBT provides expanded peripheral set and memory at the cost of package and pinout change - both require layout revision but share core MSP430 architecture and toolchain compatibility.
Availability
MSP430F122IDW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meter interfaces, and industrial condition monitors requiring stable component supply across extended product lifecycles.
Supply support for MSP430F122IDW 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 digital signal technologies, with decades of expertise in ultralow-power design.
The MSP430F122IDW belongs to the MSP430x12x ultralow-power mixed-signal MCU family, engineered specifically for extended-battery-life measurement applications such as portable instrumentation and environmental sensing.
FAQ
What is the maximum system clock frequency supported by the MSP430F122IDW?
The MSP430F122IDW supports a maximum MCLK frequency of 8 MHz at VCC = 3.6 V, and 4.15 MHz at VCC = 1.8 V, as specified in the recommended operating conditions table. This limit applies to the main CPU clock derived from the DCO or external crystal sources - exceeding it may cause timing violations or unstable operation.
Does the MSP430F122IDW support hardware debug interfaces?
Yes, the MSP430F122IDW supports JTAG-based debugging and programming through dedicated pins: TEST (pin 1), TCK (P1.4), TMS (P1.5), TDI/TCLK (P1.6), and TDO/TDI (P1.7). These pins are multiplexed with GPIO functionality but activate JTAG mode when TEST is asserted high during power-up.
Can the MSP430F122IDW perform analog-to-digital conversion without an external ADC?
Yes, the MSP430F122IDW uses its integrated Comparator_A module with Timer_A3 to implement slope-type A/D conversion on resistive sensors. By charging a capacitor through a sensor and measuring time-to-compare threshold, it achieves effective 10–12 bit resolution without external components - documented in TI application report SLAA089.
What are the valid crystal configurations for the MSP430F122IDW's LFXT1 oscillator?
The MSP430F122IDW LFXT1 oscillator supports two modes: LF mode (32.768 kHz watch crystal on XIN/XOUT) and XT1 mode (4–8 MHz ceramic resonator or crystal). In LF mode, a 5.1 MΩ resistor from XOUT to VSS is required when VCC < 2.5 V; XT1 mode requires VCC ≥ 2.2 V for 4 MHz and ≥ 2.8 V for 8 MHz operation.
Is the MSP430F122IDW pin-compatible with other devices in the MSP430x12x family?
Yes, the MSP430F122IDW is pin-compatible with MSP430F123IDW and MSP430F122IPW in the same TSSOP-28 (DW) package. All share identical pin functions, electrical characteristics, and timing - allowing seamless migration between 4KB and 8KB Flash variants without PCB redesign.
MSP430F122IDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 8MHz
- Connectivity:
- SPI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 22
- 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:
MSP430F122IDW FAQ
1.How can I place an order for MSP430F122IDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F122IDW 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 MSP430F122IDW reliable?
The price and inventory of MSP430F122IDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F122IDW is usually 5 days.
3.What payment methods are accepted for MSP430F122IDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F122IDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F122IDW?
MSP430F122IDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F122IDW 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 MSP430F122IDW?
For technical support, including MSP430F122IDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F122IDW requirements.
6.How does Aetrix verify that MSP430F122IDW is sourced from the original manufacturer or authorized distributors?
All MSP430F122IDW 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 MSP430F122IDW meets industry standards.
7.What is the process for return or replacement of MSP430F122IDW?
All MSP430F122IDW units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F122IDW, 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 MSP430F122IDW part is unused and in its original packaging.
Return procedure for MSP430F122IDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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