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Texas Instruments MSP430F6731AIPN
- Part No.:
- MSP430F6731AIPN
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
MSP430F6731AIPN.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,322
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Product details
Overview
MSP430F6731AIPN from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering. It integrates three 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments in 8-mux mode, real-time clock with crystal offset calibration, and operates from 1.8 V to 3.6 V. Its 32 KB Flash, 2 KB RAM, and 52 I/O pins in an 80-pin LQFP package support precision energy measurement in utility metering hardware.
For engineers reviewing the MSP430F6731AIPN datasheet, MSP430F6731AIPN pinout, MSP430F6731AIPN application, or MSP430F6731AIPN equivalent, key selection criteria include standby current (1.7 µA in LPM3), RTC accuracy with temperature compensation, SD24_B channel count (3), LCD segment drive capability (320 @ 8-mux), and eUSCI_A/B interface configuration (3 UART/IrDA/SPI + 1 I²C/SPI).
Technical Context
The MSP430F6731AIPN implements a 16-bit RISC CPU with extended memory addressing and constant generators for optimized code efficiency. Its unified clock system includes FLL stabilization, low-frequency VLO and trimmed REFO sources, and 32-kHz XT1 crystal support - enabling precise timing for metrology-grade sampling synchronization.
Power management integrates a programmable LDO core regulator, supply voltage supervision with brownout detection, and dual auxiliary power domains - one dedicated to the backup subsystem (RTC, 32-kHz oscillator, 4×16-bit backup memory) - ensuring reliable operation during main supply transients in revenue-grade metering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Flash Memory | 32 KB - sufficient for firmware, calibration tables, and secure metering algorithms without external storage |
| RAM | 2 KB - supports real-time accumulation buffers, FFT processing, and communication stack operation |
| ADC Resolution | Three 24-bit sigma-delta ADCs - enables high-precision current/voltage measurement with >100 dB SNR for Class 0.2 meter compliance |
| LCD Driver | Up to 320 segments in 8-mux mode - drives full-feature numeric + symbol displays in compact meter housings |
| Low-Power Mode (LPM3) | 1.7 µA at 2.2 V - allows battery-backed RTC operation for >10-year meter lifetime with minimal energy drain |
| eUSCI Interfaces | 3 × eUSCI_A (UART/IrDA/SPI) + 1 × eUSCI_B (I²C/SPI) - supports HART, DLMS/COSEM, and optical probe communication simultaneously |
| Package | 80-pin LQFP (12 mm × 12 mm) - standard industrial footprint compatible with automated SMT assembly and thermal management |
Pinout & Package
Package: 80-pin LQFP (PN), 12 mm × 12 mm body size, 0.5 mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6 (SD0P0–SD2N0) | Differential analog inputs for SD24_B ADC channels | Accept isolated current/voltage sensor outputs; require matched PCB routing for <100 µV noise coupling |
| 7 (VREF) | Reference voltage input | Accepts external 2.5 V reference for highest ADC accuracy; internal 1.5/2.0/2.5 V options available |
| 11–13 (P9.1/A5–P9.3/A3) | Analog input multiplexed with GPIO | Support auxiliary sensing (temperature, tamper detection) without consuming primary ADC channels |
| 24–25 (XIN/XOUT) | 32.768 kHz crystal oscillator terminals | Drive RTC with ±2 ppm stability over –40°C to +85°C when paired with TI-recommended crystal |
| 29 (LCDCAP/R33) | LCD charge pump capacitor connection | Must be tied to DVSS if unused; critical for stable contrast control across temperature and battery voltage |
| 32–35, 36–37, 38–39 (COM0–COM7) | LCD common segment drivers | Enable 8-mux display drive; COM0–COM3 are dedicated, COM4–COM7 share with UCA0CLK/UCB0CLK functions |
| 45–48 (P3.4–P3.7/SDCLK–SD2DIO) | SD24_B clock and data I/O | Support synchronous serial interface to external metrology sensors; P3.7 is NC on MSP430F6731AIPN per Table 4-2 |
| 75–80 (TEST–RST/NMI) | JTAG/SBW debug and reset | Enable in-system programming and real-time debugging via 4-wire Spy-Bi-Wire; RST/NMI doubles as NMI source |
Key Features
| Feature | Design Value |
|---|---|
| Password-protected RTC | Prevents unauthorized time manipulation in revenue meters; includes crystal offset calibration and temperature compensation registers |
| Separate backup supply domain | Enables independent VASYS/AUXVCCx rails - maintains RTC and 4×16-bit backup RAM during main power failure |
| Hardware multiplier (MPY32) | Executes 32-bit arithmetic in single cycle - accelerates RMS, harmonic, and tariff calculation without CPU overhead |
| Three-channel DMA | Automates data movement between SD24_B, ADC10_A, and RAM - eliminates ISR latency in continuous sampling modes |
| Enhanced UART with auto-baud detection | Supports legacy optical probe interfaces without pre-negotiated baud rates - simplifies field commissioning |
Applications
| Single-Phase Watt-Hour Meter | Energy Monitoring Gateway |
|---|---|
Use Scenario: Revenue-grade electricity meter installed in residential or commercial premises for billing. IC Role / Device Role / Timing Role: Primary metrology controller performing simultaneous voltage/current sampling, RMS/harmonic analysis, tariff computation, and LCD display update. Use Value: Three 24-bit SD24_B ADCs enable Class 0.2 accuracy; RTC with crystal calibration ensures timestamp integrity for load profiling. | Use Scenario: Edge node aggregating consumption data from multiple submeters and transmitting via NB-IoT or LoRaWAN. IC Role / Device Role / Timing Role: Low-power host MCU managing sensor fusion, secure data logging, and wireless module wake-up scheduling. Use Value: 1.7 µA LPM3 current extends battery life to >5 years; eUSCI_B I²C interfaces with environmental sensors and secure element ICs. |
| Utility Grid Sensor Node | Smart Plug Energy Analyzer |
Use Scenario: Transformer monitoring unit measuring voltage sag/swell, frequency deviation, and neutral current imbalance. IC Role / Device Role / Timing Role: Real-time waveform capture engine synchronizing SD24_B sampling to zero-crossing events using TA0 capture. Use Value: 200-ksps ADC10_A provides 50/60 Hz fundamental + 40th harmonic resolution; hardware multiplier enables on-the-fly THD calculation. | Use Scenario: Consumer-grade plug-in device measuring appliance-level energy use and cost estimation. IC Role / Device Role / Timing Role: Integrated metering SoC handling analog front-end conditioning, LCD UI, and USB/HID reporting. Use Value: Integrated LCD_C driver eliminates external display controller; 32 KB Flash accommodates OTA update bootloader and multi-language UI assets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar metrology microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F6733AIPN | 64 KB Flash, 4 KB RAM, same peripherals and pinout | Supports larger firmware (e.g., DLMS/COSEM stack + encryption) without external memory | Select when firmware complexity exceeds 32 KB or future-proofing for feature expansion is required |
| MSP430F6721AIPN | Two 24-bit SD24_B ADCs (vs. three), 32 KB Flash, 2 KB RAM, identical package | Suitable for cost-sensitive meters where dual-element (voltage + current) measurement suffices | Select for simplified Class 1 meter designs where third SD24_B channel is unused |
Compared with MSP430F6733AIPN, the MSP430F6731AIPN trades Flash/RAM capacity for lower BOM cost while retaining identical metrology ADC performance and RTC features; versus MSP430F6721AIPN, it adds a third SD24_B channel essential for neutral current monitoring in modern smart meters.
Availability
MSP430F6731AIPN is available at Aetrix Electronics and suitable for single-phase watt-hour meters, energy monitoring gateways, and utility grid sensor nodes requiring stable component supply, long-term lifecycle support, and TI-qualified metrology-grade silicon.
Supply support for MSP430F6731AIPN 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 company delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.
The MSP430F673xA family targets precision metrology applications, integrating high-resolution sigma-delta ADCs, low-power RTC, and LCD drivers specifically for revenue-grade energy measurement systems.
FAQ
What is the maximum sampling rate supported by the 10-bit ADC in the MSP430F6731AIPN?
The MSP430F6731AIPN's ADC10_A module supports a maximum sampling rate of 200 ksps. This is achieved using the internal ADC10CLK source, with sample-and-hold and autoscan features enabled. The specification is validated under recommended operating conditions (3.0 V, 25°C) and applies directly to the MSP430F6731AIPN variant per Section 5.8 of the SLASE46A datasheet.
Does the MSP430F6731AIPN support crystal-based real-time clock operation with temperature compensation?
Yes, the MSP430F6731AIPN supports RTC operation with a 32.768 kHz crystal (XT1) and includes built-in temperature compensation and crystal offset calibration registers. These features are accessible via the RTC_C module and are documented in Section 6.11.11 of the MSP430F5xx/F6xx Family User's Guide, applicable to the MSP430F6731AIPN.
How many differential analog input channels does the MSP430F6731AIPN provide for metrology-grade measurements?
The MSP430F6731AIPN integrates three independent 24-bit sigma-delta ADC modules (SD24_B), each supporting differential PGA inputs. As confirmed in Table 3-1 of the SLASE46A datasheet, all MSP430F673xA variants - including the MSP430F6731AIPN - feature three SD24_B converters, enabling simultaneous voltage, current, and neutral current measurement.
What is the standby current consumption of the MSP430F6731AIPN in LPM3 mode with RTC active?
The MSP430F6731AIPN consumes 1.7 µA in LPM3 mode at 2.2 V (typical), with RTC, watchdog, and supply supervisor operational and full RAM retention. This value is specified in Section 1.1 "Features" of the SLASE46A datasheet and applies identically across all MSP430F673xAIPN devices, including the MSP430F6731AIPN.
Is the MSP430F6731AIPN pin-compatible with other members of the MSP430F673xA family in the 80-pin LQFP package?
Yes, the MSP430F6731AIPN shares identical pinout and electrical characteristics with other MSP430F673xAIPN variants (e.g., MSP430F6733AIPN, MSP430F6736AIPN) in the 80-pin LQFP package. Table 4-2 in the SLASE46A datasheet confirms identical signal assignments across all MSP430F673xAIPN devices, with only functional differences (Flash, RAM, SD24_B count) internal to the die.
MSP430F6731AIPN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 80-LQFP
- Series:
- MSP430F6xx
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPUXV2
- Core Size:
- 16-Bit
- Speed:
- 25MHz
- Connectivity:
- I2C, IrDA, LINbus, SCI, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 5x10b, 3x24b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F6731AIPN FAQ
1.How can I place an order for MSP430F6731AIPN through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F6731AIPN 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 MSP430F6731AIPN reliable?
The price and inventory of MSP430F6731AIPN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F6731AIPN is usually 5 days.
3.What payment methods are accepted for MSP430F6731AIPN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F6731AIPN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F6731AIPN?
MSP430F6731AIPN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F6731AIPN 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 MSP430F6731AIPN?
For technical support, including MSP430F6731AIPN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F6731AIPN requirements.
6.How does Aetrix verify that MSP430F6731AIPN is sourced from the original manufacturer or authorized distributors?
All MSP430F6731AIPN 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 MSP430F6731AIPN meets industry standards.
7.What is the process for return or replacement of MSP430F6731AIPN?
All MSP430F6731AIPN units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F6731AIPN, 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 MSP430F6731AIPN part is unused and in its original packaging.
Return procedure for MSP430F6731AIPN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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