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Texas Instruments MSP430F123IPW
- Part No.:
- MSP430F123IPW
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MSP430F123IPW.pdf
- Description:
- IC MCU 16BIT 8KB FLASH 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:280
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Product details
Overview
MSP430F123IPW from Texas Instruments is an ultralow-power 16-bit RISC mixed-signal microcontroller featuring 8KB+256B flash memory, 256B RAM, a 16-bit Timer_A with three capture/compare registers, on-chip analog comparator, and USART0 supporting UART/SPI modes. It operates from 1.8 V to 3.6 V and targets battery-powered sensor systems requiring sub-μA standby current and <6 μs wake-up.
For engineers reviewing the MSP430F123IPW datasheet, MSP430F123IPW pinout, MSP430F123IPW application, or MSP430F123IPW equivalent, key selection criteria include its 28-pin TSSOP (PW) package, 22 GPIO pins, integrated slope A/D capability via comparator, and support for JTAG debugging and BSL serial programming without external voltage.
Technical Context
The MSP430F123IPW 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 supports multiple sources: internal DCO (wake-up <6 μs), 32 kHz crystal, high-frequency crystal, resonator, or external clock.
It integrates three 8-bit I/O ports (P1–P3), with P1 and P2 supporting edge-selectable interrupts; P3 has no interrupt capability. The USART0 peripheral provides double-buffered synchronous SPI (3/4-pin) and asynchronous UART communication, while Timer_A3 delivers PWM, interval timing, and capture/compare functions with dedicated interrupt vectors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 general-purpose registers and constant generators; enables efficient low-power firmware execution |
| Memory | 8KB + 256B flash program memory, 256B RAM; supports in-system programming and BSL UART-based updates |
| Supply Voltage | 1.8 V to 3.6 V; compatible with single-cell Li-ion, alkaline, or coin-cell batteries without regulation |
| Active Current | 200 μA at 1 MHz / 2.2 V; enables multi-year operation in duty-cycled sensor nodes |
| Standby Current | 0.7 μA; retains RAM and wakes in <6 μs-critical for responsive ultra-low-power sensing |
| Timer Resources | 16-bit Timer_A3 with three capture/compare registers; supports PWM generation, input capture, and precise timing intervals |
| Analog Function | On-chip comparator_A with CA0/CA1 inputs and CAOUT output; enables slope A/D conversion on resistive sensors |
Pinout & Package
Package: 28-pin Plastic Thin Shrink Small-Outline Package (TSSOP), body width 4.4 mm, lead pitch 0.65 mm, RoHS-compliant.
| 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 |
| P1.1/TA0 | Timer_A channel 0 I/O | Supports capture (CCI0A) or compare (Out0); used for BSL transmit |
| P1.2/TA1 | Timer_A channel 1 I/O | Supports capture (CCI1A) or compare (Out1); usable as general-purpose I/O |
| P1.3/TA2 | Timer_A channel 2 I/O | Supports capture (CCI2A) or compare (Out2); usable as general-purpose I/O |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Drives SMCLK to peripherals; serves as TCK during JTAG programming and debug |
| P1.5/TA0/TMS | Timer_A channel 0 output / JTAG mode select | Provides TA0 compare output; functions as TMS during JTAG interface |
| P1.6/TA1/TDI/TCLK | Timer_A channel 1 output / JTAG data input | Provides TA1 compare output; accepts TDI or TCLK during JTAG operations |
| P1.7/TA2/TDO/TDI | Timer_A channel 2 output / JTAG data I/O | Provides TA2 compare output; outputs TDO or accepts TDI depending on JTAG instruction |
| P2.0/ACLK | Auxiliary clock output | Drives ACLK (typically 32.768 kHz) to real-time clock or low-power peripherals |
| P2.1/INCLK | Timer_A internal clock input | Feeds internal clock signal to Timer_A; configurable as general-purpose I/O |
| P2.2/CAOUT/TA0 | Comparator output / Timer_A channel 0 input | Outputs comparator result; also accepts CCI0B capture input; used for BSL receive |
| P2.3/CA0/TA1 | Comparator input A / Timer_A channel 1 input | Primary analog input for comparator; also accepts CCI1B capture input |
| P2.4/CA1/TA2 | Comparator input B / Timer_A channel 2 input | Secondary analog input for comparator; also accepts CCI2B capture input |
| P2.5/ROSC | DCO resistor input | Connects external resistor to set nominal DCO frequency; enables fast wake-up without crystal |
| P3.0/STE0 | USART0 slave transmit enable | Controls SPI master/slave data flow direction; active-low signal for synchronous communication |
| P3.1/SIMO0 | USART0 slave-in/master-out | Serial data output in SPI slave mode; input in SPI master mode |
| P3.2/SOMI0 | USART0 slave-out/master-in | Serial data input in SPI slave mode; output in SPI master mode |
| P3.3/UCLK0 | USART0 clock I/O | External clock input in UART mode; clock output in SPI mode |
| P3.4/UTXD0 | USART0 transmit data | UART serial transmit output; driven only when USART0 is enabled in UART mode |
| P3.5/URXD0 | USART0 receive data | UART serial receive input; sampled synchronously with internal baud rate generator |
| P3.6, P3.7 | General-purpose I/O | No interrupt capability; fully software-configurable digital I/O pins |
| RST/NMI | Reset / non-maskable interrupt | Active-low reset input; doubles as NMI source when configured in NMI mode |
| TEST | JTAG test mode select | Enables JTAG interface on Port 1 pins; required for boundary-scan and full-speed emulation |
| VCC | Power supply | Primary supply rail (1.8–3.6 V); powers core, peripherals, and I/O buffers |
| VSS | Ground reference | System ground return; must be low-impedance for stable analog and digital operation |
| XIN, XOUT | Crystal oscillator input/output | Supports 32.768 kHz watch crystal or 4–8 MHz high-frequency crystal for precision timing |
Key Features
| Feature | Design Value |
|---|---|
| Five power-saving modes (LPM0–LPM4) | Enables system-level energy optimization: LPM3 draws only 0.7 μA at 2.2 V, LPM4 draws 0.1 μA with ACLK disabled |
| Digitally controlled oscillator (DCO) | Stabilizes in <6 μs from any low-power mode-enables rapid response to sensor events without crystal startup delay |
| Integrated analog comparator | Supports precision slope A/D conversion on resistive sensors (e.g., thermistors, potentiometers) without external ADC |
| Bootloader (BSL) with UART interface | Allows field firmware updates via P1.1 (TX) and P2.2 (RX); no external programmer or high-voltage required |
| JTAG interface with TEST pin | Enables full-speed debugging, flash programming, and boundary-scan testing using standard tools (e.g., MSP-FET) |
| 22 programmable I/O pins | Includes interrupt-capable P1/P2 pins and flexible peripheral mapping-reduces need for external glue logic in compact designs |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity node transmitting data via sub-GHz RF transceiver. IC Role / Device Role / Timing Role: MSP430F123IPW acquires analog sensor signals via comparator-based slope A/D, manages low-duty-cycle RF transmission timing, and executes sleep/wake scheduling. Use Value: 0.1 μA LPM4 current extends 2-AA battery life beyond 5 years; <6 μs wake-up ensures timely response to alarm thresholds. | Use Scenario: Handheld pulse oximeter with LED drive control and analog photodiode signal conditioning. IC Role / Device Role / Timing Role: MSP430F123IPW drives synchronized red/IR LEDs using Timer_A PWM, samples photodiode output via comparator slope A/D, and displays results on segmented LCD. Use Value: Integrated comparator eliminates external op-amp; 256B RAM stores waveform buffers; 1.8 V operation enables direct use of coin-cell battery. |
| Smart Utility Meter Interface | Industrial Data Logger |
Use Scenario: Tamper-resistant electricity meter with magnetic event detection and secure firmware update capability. IC Role / Device Role / Timing Role: MSP430F123IPW monitors Hall-effect sensor inputs via P1/P2 interrupts, logs timestamps using ACLK-driven Timer_A, and validates BSL password before firmware update. Use Value: Programmable code protection prevents unauthorized flash access; 0.7 μA LPM3 current meets IEC 62053-21 metering standards for standby power. | Use Scenario: Ruggedized environmental logger recording temperature, pressure, and humidity every 10 minutes for 12 months. IC Role / Device Role / Timing Role: MSP430F123IPW configures Timer_A to generate periodic wake-up events, reads sensors via comparator A/D, stores data in flash, and enters LPM4 between cycles. Use Value: 8KB flash accommodates firmware + 6-month data history; 28-pin TSSOP simplifies PCB layout in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F122IPW | 4KB+256B flash (vs. 8KB), otherwise identical architecture, pinout, and peripherals | Suitable for simpler firmware with smaller code footprint; lacks headroom for complex protocol stacks or OTA updates | Select when application code size remains under 3.5 KB and future feature expansion is unlikely |
| MSP430F2274IPW | 16KB flash, 1KB RAM, enhanced USCI (UART/SPI/I²C), 10-bit ADC, but different pinout and register map | Requires PCB redesign and firmware porting; offers higher integration but increases BOM cost and validation effort | Choose only when additional memory, ADC, or I²C interface is mandatory-and design schedule allows requalification |
Compared with MSP430F122IPW, the MSP430F123IPW provides double flash capacity for robust firmware updates and sensor fusion algorithms; compared with MSP430F2274IPW, it retains full pin compatibility and lower system cost while meeting baseline ultralow-power requirements.
Availability
MSP430F123IPW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meter interfaces, and industrial data loggers requiring stable component supply across extended production lifecycles.
Supply support for MSP430F123IPW 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 90 years of innovation in low-power electronics.
The MSP430F123IPW belongs to the MSP430x12x ultralow-power mixed-signal MCU family, designed specifically for battery-operated measurement and sensing applications where nanowatt-level standby current and rapid wake-up are critical.
FAQ
What is the maximum operating frequency of the MSP430F123IPW at 3.6 V?
The MSP430F123IPW supports a maximum system clock (MCLK) frequency of 8 MHz at 3.6 V, as specified in the recommended operating conditions. This applies when using the internal DCO or external high-frequency crystal source. At lower supply voltages (e.g., 1.8 V), the maximum frequency reduces to 4.15 MHz to maintain timing margins and reliability.
Does the MSP430F123IPW support hardware UART or only software-emulated serial?
The MSP430F123IPW includes a hardware USART0 peripheral that natively supports asynchronous UART mode with dedicated TX/RX registers (U0TXBUF/U0RXBUF), baud rate control (U0BR0/U0BR1), and modulation control (U0MCTL). No bit-banging or timer-based software UART is required-full hardware UART functionality is available on P3.4 (UTXD0) and P3.5 (URXD0).
Can the MSP430F123IPW perform analog-to-digital conversion without an external ADC?
Yes-the MSP430F123IPW integrates Comparator_A, which supports slope-type analog-to-digital conversion using an external RC network and Timer_A. By charging a capacitor through a resistor and measuring time-to-compare threshold, the device achieves effective 10–12 bit resolution without adding external components. This is documented in TI Application Report SLAA089.
Is the MSP430F123IPW pin-compatible with other devices in the MSP430x12x family?
Yes-the MSP430F123IPW shares identical pinout, electrical characteristics, and peripheral register mapping with all 28-pin TSSOP variants in the MSP430x12x family, including MSP430F122IPW and MSP430F123IDW (DW package). Firmware and PCB layouts are interchangeable between these parts, differing only in flash size and package type.
What debug and programming interfaces does the MSP430F123IPW support?
The MSP430F123IPW supports two primary interfaces: JTAG via TEST, TCK, TMS, TDI/TDO pins (P1.4–P1.7) for full-speed debugging and flash programming, and UART-based Bootstrap Loader (BSL) via P1.1 (TX) and P2.2 (RX) for field firmware updates without external hardware programmers.
MSP430F123IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Tube
- 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:
- 8KB (8K 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:
MSP430F123IPW FAQ
1.How can I place an order for MSP430F123IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F123IPW 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 MSP430F123IPW reliable?
The price and inventory of MSP430F123IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F123IPW is usually 5 days.
3.What payment methods are accepted for MSP430F123IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F123IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F123IPW?
MSP430F123IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F123IPW 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 MSP430F123IPW?
For technical support, including MSP430F123IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F123IPW requirements.
6.How does Aetrix verify that MSP430F123IPW is sourced from the original manufacturer or authorized distributors?
All MSP430F123IPW 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 MSP430F123IPW meets industry standards.
7.What is the process for return or replacement of MSP430F123IPW?
All MSP430F123IPW units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F123IPW, 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 MSP430F123IPW part is unused and in its original packaging.
Return procedure for MSP430F123IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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