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Texas Instruments MSP430F123IDWR
- Part No.:
- MSP430F123IDWR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSP430F123IDWR.pdf
- Description:
- IC MCU 16BIT 8KB FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,783
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Product details
Overview
MSP430F123IDWR 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 protocols. 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 MSP430F123IDWR datasheet, MSP430F123IDWR pinout, MSP430F123IDWR application, or MSP430F123IDWR equivalent, key selection criteria include its 28-pin TSSOP (PW) package, −40°C to 85°C industrial temperature range, integrated slope A/D capability via comparator, and JTAG/debug support through dedicated TEST, TCK, TMS, TDI/TDO pins.
Technical Context
The MSP430F123IDWR implements a 16-bit RISC 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; Timer_A3 provides three independent capture/compare channels for PWM, interval timing, and input capture; the analog comparator enables battery monitoring and resistive sensor slope A/D conversion without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with 16 general-purpose registers and constant generators for optimized code density and execution speed |
| Memory | 8KB + 256B flash program memory and 256B RAM - sufficient for standalone sensor firmware with data buffering |
| Supply Voltage | 1.8 V to 3.6 V - compatible with single-cell Li-ion, LiFePO₄, or dual alkaline batteries without regulation |
| Active Current | 200 μA at 1 MHz, 2.2 V - enables multi-year operation in duty-cycled sensing nodes |
| Standby Current | 0.7 μA - supports long-term sleep between sensor readings while retaining RAM |
| Wake-up Time | <6 μs from LPM3/LPM4 - critical for responsive event-driven systems like tamper detection |
| Timer Resources | 16-bit Timer_A3 with three capture/compare registers - supports simultaneous PWM generation, input capture, and interval timing |
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 timing source for asynchronous Timer_A operation; also functions as general I/O |
| P1.1/TA0 | Timer_A channel 0 I/O | Supports capture of CCI0A events or compare output Out0; used for BSL transmit |
| P1.2/TA1 | Timer_A channel 1 I/O | Supports capture of CCI1A events or compare output Out1; usable as general I/O |
| P1.3/TA2 | Timer_A channel 2 I/O | Supports capture of CCI2A events or compare output Out2; usable as general I/O |
| P1.4/SMCLK/TCK | Sub-main clock output / JTAG test clock | Drives SMCLK to peripherals; doubles as TCK for JTAG programming and debug |
| P1.5/TA0/TMS | Timer_A channel 0 output / JTAG mode select | Provides TA0 compare output; serves as TMS for JTAG state control |
| P1.6/TA1/TDI/TCLK | Timer_A channel 1 output / JTAG data input | Provides TA1 compare output; accepts TDI or TCLK depending on JTAG instruction |
| P1.7/TA2/TDO/TDI | Timer_A channel 2 output / JTAG data output | Provides TA2 compare output; outputs TDO or inputs TDI per JTAG instruction |
| P2.0/ACLK | Auxiliary clock output | Drives ACLK (typically 32.768 kHz) to real-time clock modules or low-power peripherals |
| P2.1/INCLK | Timer_A internal clock input | Feeds internal clock signal to Timer_A; configurable as general I/O |
| P2.2/CAOUT/TA0 | Comparator_A output / Timer_A channel 0 input | Delivers comparator result; also accepts CCI0B for synchronous capture; used for BSL receive |
| P2.3/CA0/TA1 | Comparator_A input 0 / Timer_A channel 1 input | Primary analog input for comparator; also accepts CCI1B for capture |
| P2.4/CA1/TA2 | Comparator_A input 1 / Timer_A channel 2 input | Secondary analog input for comparator; also accepts CCI2B for capture |
| P2.5/ROSC | DCO resistor input | Connects external resistor to set nominal DCO frequency; enables fast wake-up without crystal |
| P3.0/STE0 | USART0 SPI slave transmit enable | Controls data flow direction in SPI slave mode; not used in UART mode |
| P3.1/SIMO0 | USART0 SPI master-out/slave-in | Serial data output in master mode; input in slave mode - bidirectional SPI line |
| P3.2/SOMI0 | USART0 SPI master-in/slave-out | Serial data input in master mode; output in slave mode - bidirectional SPI line |
| P3.3/UCLK0 | USART0 clock I/O | External clock input in UART mode; clock output in SPI master mode |
| P3.4/UTXD0 | USART0 UART transmit data | Serial TX output in UART mode; unused in SPI mode |
| P3.5/URXD0 | USART0 UART receive data | Serial RX input in UART mode; unused in SPI mode |
| P3.6, P3.7 | General-purpose I/O | Two additional digital I/O pins with no interrupt or peripheral mapping |
| RST/NMI | Reset / non-maskable interrupt | Active-low reset input; double-function as NMI trigger for critical fault handling |
| TEST | JTAG test mode select | Enables JTAG interface when pulled high during power-up; required for debugging and programming |
| VCC | Power supply | Primary 1.8–3.6 V supply rail; must be decoupled locally with 100 nF ceramic capacitor |
| VSS | Ground reference | Digital ground return; requires low-impedance connection to system GND plane |
| XIN, XOUT | Crystal oscillator input/output | Supports 32.768 kHz watch crystal or 4–8 MHz high-frequency crystal for precise timing |
Key Features
| Feature | Design Value |
|---|---|
| Five programmable low-power modes (LPM0–LPM4) | Enables fine-grained power management: LPM3 retains RAM with only ACLK active; LPM4 shuts down all clocks including crystal for lowest leakage |
| Integrated analog comparator with two inputs and output | Performs battery voltage supervision or resistive sensor slope A/D without external op-amps or ADCs - reduces BOM count and PCB area |
| On-chip bootstrap loader (BSL) | Allows field firmware updates via UART using P1.1 (TX) and P2.2 (RX); eliminates need for JTAG programmer in production or service |
| Digitally controlled oscillator (DCO) | Stabilizes in <6 μs from any low-power mode - enables rapid response to external interrupts without crystal startup delay |
| Programmable code protection via security fuse | Prevents unauthorized read-out of flash contents by blowing JTAG fuse - protects intellectual property in deployed devices |
Applications
| Wireless Sensor Node | Battery-Powered Data Logger |
|---|---|
Use Scenario: Compact environmental monitor measuring temperature, humidity, and light, transmitting data via sub-GHz RF link every 5 minutes. IC Role / Device Role / Timing Role: MSP430F123IDWR acts as main controller, managing sensor interfaces, performing slope A/D on thermistor networks, scheduling RF transmission, and entering LPM3 between readings. Use Value: 0.7 μA standby current extends 2×AA battery life beyond 5 years; integrated comparator eliminates external signal conditioning ICs. | Use Scenario: Industrial vibration logger mounted on rotating equipment, capturing acceleration waveforms at 1 kHz for 10 seconds upon trigger, then storing to EEPROM. IC Role / Device Role / Timing Role: MSP430F123IDWR serves as acquisition controller, configuring Timer_A3 for precise 1 kHz sampling, buffering data in RAM, and initiating EEPROM write after capture. Use Value: 16-bit Timer_A3 with three capture/compare registers enables synchronized sampling and trigger latency under 1 μs; 8KB flash stores firmware and calibration tables. |
| Smart Utility Meter Interface | Portable Medical Diagnostic Tool |
Use Scenario: Pulse-output interface for water/gas meters, converting mechanical meter pulses into time-stamped digital events for LoRaWAN uplink. IC Role / Device Role / Timing Role: MSP430F123IDWR monitors pulse inputs on P1.x with edge-selectable interrupts, timestamps events using Timer_A3, and formats packets for UART-to-LoRa module. Use Value: Sub-μA LPM4 mode ensures >10-year battery life on coin cell; hardware UART eliminates bit-banged serial overhead. | Use Scenario: Handheld blood glucose meter with LCD display, button interface, and electrochemical sensor strip reading. IC Role / Device Role / Timing Role: MSP430F123IDWR controls analog front-end biasing, performs slope A/D on sensor current, manages LCD driver, and handles button debouncing and low-battery alert. Use Value: On-chip comparator directly digitizes sensor current ramp; 256B RAM holds measurement history and calibration coefficients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F122IDWR | 4KB+256B flash (vs. 8KB), otherwise identical architecture, pinout, and peripherals | Suitable for simpler firmware with smaller code footprint; lacks headroom for future feature expansion | Select when application code size remains under 3.5 KB and cost sensitivity outweighs upgrade path flexibility |
| MSP430F2274IRHBT | 32-pin QFN package, 16KB flash, 1KB RAM, enhanced USCI module (replaces USART0), higher MCLK (16 MHz) | Requires PCB redesign due to different pin count and layout; supports larger applications and faster communication | Choose for new designs needing more memory, USB-capable communication, or higher processing throughput - not drop-in compatible |
Compared with MSP430F122IDWR, the MSP430F123IDWR provides double flash capacity for complex sensor algorithms without changing footprint; versus MSP430F2274IRHBT, it offers proven industrial reliability in TSSOP with lower BOM cost but less memory and no USCI.
Availability
MSP430F123IDWR is available at Aetrix Electronics and suitable for wireless sensor nodes, battery-powered data loggers, smart utility meter interfaces, and portable medical diagnostic tools requiring stable component supply across extended product lifecycles.
Supply support for MSP430F123IDWR 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 markets.
The MSP430F123IDWR belongs to the MSP430x12x ultralow-power mixed-signal MCU family, designed specifically for battery-operated measurement and sensing applications where multi-year operation and rapid wake-up from deep sleep are essential.
FAQ
What is the maximum operating frequency of the MSP430F123IDWR at 3.6 V?
The MSP430F123IDWR supports a maximum system clock (MCLK) frequency of 8 MHz at VCC = 3.6 V, as specified in the recommended operating conditions. This applies when using the internal DCO or external crystal/resonator sources. At lower supply voltages such as 1.8 V, the maximum frequency is reduced to 4.15 MHz to maintain timing margins and stability.
Does the MSP430F123IDWR support in-system programming without external hardware?
Yes, the MSP430F123IDWR includes a factory-programmed bootstrap loader (BSL) that enables in-system programming via UART using only P1.1 (TXD) and P2.2 (RXD) pins. No external programming voltage or JTAG interface is required, allowing firmware updates in the field using standard serial communication - provided the BSL password has not been disabled.
Which pins on the MSP430F123IDWR support external interrupt capability?
The MSP430F123IDWR supports external interrupts on all eight bits of Port P1 (P1.0–P1.7) and six bits of Port P2 (P2.0–P2.5). Each of these pins can be individually configured for rising-edge, falling-edge, or both-edge triggering via the P1IE, P2IE, P1IES, and P2IES registers. Port P3 pins do not support interrupt functionality.
Can the MSP430F123IDWR's analog comparator perform slope A/D conversion?
Yes, the MSP430F123IDWR's integrated Comparator_A module supports slope A/D conversion by charging a capacitor through a known current and measuring the time required for the comparator output to toggle. This technique uses CA0 and CA1 as analog inputs and CAOUT as the digital result, eliminating the need for external ADC components in resistive sensor applications such as thermistors or potentiometers.
What is the purpose of the ROSC pin on the MSP430F123IDWR?
The ROSC pin (P2.5) on the MSP430F123IDWR connects to an external resistor that sets the nominal frequency of the internal digitally controlled oscillator (DCO). This enables fast wake-up from low-power modes (<6 μs) without relying on crystal startup time, making it ideal for applications requiring rapid response to external events while maintaining ultralow power consumption in sleep states.
MSP430F123IDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Series:
- MSP430x1xx
- Packaging:
- Tape & Reel (TR)
- 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:
MSP430F123IDWR FAQ
1.How can I place an order for MSP430F123IDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F123IDWR 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 MSP430F123IDWR reliable?
The price and inventory of MSP430F123IDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F123IDWR is usually 5 days.
3.What payment methods are accepted for MSP430F123IDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F123IDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F123IDWR?
MSP430F123IDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F123IDWR 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 MSP430F123IDWR?
For technical support, including MSP430F123IDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F123IDWR requirements.
6.How does Aetrix verify that MSP430F123IDWR is sourced from the original manufacturer or authorized distributors?
All MSP430F123IDWR 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 MSP430F123IDWR meets industry standards.
7.What is the process for return or replacement of MSP430F123IDWR?
All MSP430F123IDWR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F123IDWR, 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 MSP430F123IDWR part is unused and in its original packaging.
Return procedure for MSP430F123IDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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