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Texas Instruments MSP430F6721AIPZ
- Part No.:
- MSP430F6721AIPZ
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
MSP430F6721AIPZ.pdf
- Description:
- IC MCU 16BIT 32KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,848
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Product details
Overview
MSP430F6721AIPZ from Texas Instruments is an ultra-low-power mixed-signal microcontroller designed for single-phase electronic watt-hour metering applications. It integrates two 24-bit sigma-delta ADCs, a 10-bit 200-ksps ADC, LCD driver supporting up to 320 segments, and three eUSCI_A modules (UART/IrDA/SPI) plus one eUSCI_B (I²C/SPI), all operating from 1.8 V to 3.6 V supply. Its 32-kHz RTC with crystal offset calibration enables precise energy billing in utility meter designs.
For engineers reviewing the MSP430F6721AIPZ datasheet, MSP430F6721AIPZ pinout, MSP430F6721AIPZ application, or MSP430F6721AIPZ equivalent, key selection criteria include standby current (1.7 µA in LPM3), 32 KB flash/2 KB RAM capacity, 100-pin LQFP package with 72 GPIOs, and dual ADC architecture optimized for metrology-grade voltage/current sensing.
Technical Context
The MSP430F6721AIPZ implements a 16-bit RISC CPU with 25-MHz system clock capability and flexible power management including integrated LDO, supply supervision, and dual auxiliary supplies. Its unified clock system combines FLL stabilization, VLO, REFO, and XT1 32-kHz crystal support for robust timing across metering modes.
It features three 16-bit Timer_A modules (one with three capture/compare registers, two with two each), hardware multiplier for 32-bit arithmetic, three-channel DMA, and password-protected RTC with temperature compensation-enabling accurate time-of-use billing and low-power wake-up in <3 µs from LPM3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Flash Memory | 32 KB - sufficient for full metrology firmware, calibration tables, and communication stacks without external storage |
| RAM | 2 KB - supports real-time accumulation of energy data, LCD buffer, and multi-protocol stack operation |
| ADC Resolution | Two 24-bit SD24_B converters - enables high-precision current/voltage measurement with >100 dB SNR for Class 0.2 meter compliance |
| 10-bit ADC | 200 ksps with internal reference - provides fast auxiliary sensing (e.g., temperature, supply monitoring) without external components |
| Low-Power Mode LPM3 | 1.7 µA at 2.2 V - ensures >10-year battery life in backup-powered RTC operation for tamper detection and timekeeping |
| Package | 100-pin LQFP (14 mm × 14 mm) - delivers 72 I/O pins for sensor interfaces, LCD segment/backplane routing, and communication peripherals |
| Supply Voltage Range | 1.8 V to 3.6 V - supports direct connection to standard metering power rails and battery-backed operation |
Pinout & Package
Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, 0.5 mm pitch, exposed thermal pad (not electrically connected). Requires external connection of VDSYS and DVSYS pins per TI design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–6 (SD0P0–SD2N0) | Differential analog inputs for SD24_B ADC channels | Accepts isolated current transformer or shunt-based differential signals; pins 5–6 are NC on MSP430F6721AIPZ |
| 11–13 (P9.1/A5–P9.3/A3) | Analog input multiplexed with GPIO | Supports third-party sensor integration (e.g., temperature, optical tamper) with shared pin resources |
| 14–15 (P1.0/VeREF−, P1.1/VeREF+) | External reference input terminals | Enable precision ratiometric measurement using external low-drift voltage reference for metrology accuracy |
| 24–25 (XIN/XOUT) | 32-kHz crystal oscillator terminals | Drive external tuning fork crystal for RTC; requires load capacitors per crystal manufacturer spec |
| 29 (LCDCAP/R33) | LCD charge pump capacitor terminal | Must be connected to DVSS if unused; critical for stable contrast control in 8-mux LCD configurations |
| 32–35, 36–37, 38–39 (COM0–COM7) | LCD backplane outputs | Drive up to 8 common lines in multiplexed LCD display; enable direct interface to 320-segment meter displays |
| 95 (TEST/SBWTCK) | SBW debug clock input | Enables in-system programming and debugging via 2-wire Spy-Bi-Wire interface; no external JTAG header required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low standby current | 1.7 µA in LPM3 with RTC active - extends battery life in non-volatile timekeeping for anti-tamper logging |
| Integrated LCD driver | Supports 320 segments in 8-mux mode with programmable contrast - eliminates external LCD controller in cost-sensitive meters |
| Dual sigma-delta ADC architecture | Two independent 24-bit SD24_B converters - enables simultaneous voltage and current sampling for true RMS and harmonic analysis |
| Password-protected RTC | Crystal offset calibration + temperature compensation - maintains ±1 ppm accuracy over –40°C to +85°C for time-of-use billing integrity |
| Three eUSCI_A modules | UART with auto-baud detection + IrDA encoding - simplifies interoperability with optical probe readers and PLC modems |
Applications
| Smart Electricity Meter | Energy Monitoring Gateway |
|---|---|
Use Scenario: Residential or commercial single-phase electricity meter performing kWh accumulation, tariff switching, and tamper detection. IC Role / Device Role / Timing Role: Primary metrology MCU handling analog front-end digitization, real-time energy calculation, secure RTC timestamping, and LCD display control. Use Value: Dual 24-bit SD24_B ADCs enable Class 0.2 accuracy per IEC 62053-21; 1.7 µA LPM3 current ensures >10-year battery-backed RTC operation. | Use Scenario: DIN-rail mounted gateway aggregating consumption data from multiple submeters and transmitting via RS-485 or NB-IoT. IC Role / Device Role / Timing Role: Central data concentrator MCU managing multi-protocol communication (UART, I²C, SPI), local storage buffering, and secure firmware updates. Use Value: Three eUSCI_A modules support concurrent UART (optical probe), IrDA (legacy reader), and SPI (flash memory); 72 GPIOs route all required interfaces without expansion logic. |
| Prepayment Energy Meter | Utility Grid Sensor Node |
Use Scenario: Pay-as-you-go meter requiring secure credit validation, LCD balance display, and magnetic tamper response. IC Role / Device Role / Timing Role: Secure metering controller executing AES-128 encryption, real-time balance computation, and immediate LCD update on credit top-up. Use Value: Hardware multiplier accelerates cryptographic operations; integrated LCD driver drives 320-segment display directly; password-protected RTC prevents clock manipulation. | Use Scenario: Transformer monitoring node measuring voltage sag/swell, neutral current imbalance, and temperature in distribution substations. IC Role / Device Role / Timing Role: Precision sensing MCU acquiring synchronized voltage/current waveforms, computing PQ metrics, and triggering alarms on IEEE 1159 events. Use Value: Simultaneous sampling across two 24-bit ADCs enables phase-angle accuracy <0.1°; 200-ksps 10-bit ADC captures transient events like lightning surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar metrology microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F6723AIPZ | 64 KB flash, 4 KB RAM, same ADC/peripheral set | Supports larger firmware (e.g., DLMS/COSEM stack, OTA updates) without external memory | Select when firmware complexity exceeds 32 KB or field-upgrade capability is required |
| MSP430F6720AIPZ | 16 KB flash, 1 KB RAM, identical peripheral configuration | Targeted for cost-optimized meters with minimal feature set (no time-of-use, basic LCD only) | Select for entry-level meters where BOM cost reduction outweighs firmware flexibility needs |
Compared with MSP430F6723AIPZ and MSP430F6720AIPZ, the MSP430F6721AIPZ offers optimal balance of memory headroom (32 KB flash), metrology accuracy (dual 24-bit ADCs), and low-power operation (1.7 µA LPM3), making it ideal for mid-tier single-phase meters requiring long-term reliability and moderate feature depth.
Availability
MSP430F6721AIPZ is available at Aetrix Electronics and suitable for smart electricity meters, prepayment energy meters, and utility grid sensor nodes requiring stable component supply, long lifecycle support, and metrology-grade accuracy.
Supply support for MSP430F6721AIPZ 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 MSP430F672xA family is engineered specifically for single-phase energy metering, integrating metrology-optimized ADCs, LCD drivers, and ultra-low-power RTC to meet IEC 62053 and ANSI C12 standards without external support ICs.
FAQ
What is the maximum system clock frequency supported by the MSP430F6721AIPZ?
The MSP430F6721AIPZ supports a maximum system clock frequency of 25 MHz, enabled by its integrated FLL control loop and DCO oscillator. This allows high-speed execution of metrology algorithms-including RMS, harmonic analysis, and tariff switching-while maintaining compatibility with the device's ultra-low-power architecture. The 25-MHz capability is confirmed in the functional block diagram and electrical specifications section of the SLASE46A datasheet.
Does the MSP430F6721AIPZ include hardware support for cryptographic operations?
The MSP430F6721AIPZ does not integrate dedicated cryptographic accelerators (e.g., AES, SHA), but its 32-bit hardware multiplier significantly accelerates software-implemented encryption such as AES-128 used in prepayment meter security protocols. The device's password-protected RTC and secure BSL also provide foundational security layers. For full hardware crypto, designers should consider newer MSP430FRxx FRAM devices-but the MSP430F6721AIPZ remains widely deployed in certified meters relying on validated software crypto libraries.
How many LCD segments can the MSP430F6721AIPZ drive, and what mux configurations are supported?
The MSP430F6721AIPZ integrates the LCD_C module capable of driving up to 320 segments in 8-mux mode, with support for 2-, 3-, 4-, and 8-mux configurations. It provides eight COM outputs (COM0–COM7) and up to 40 SEG outputs (via port mapping), enabling direct interface to standard utility meter LCD glass without external drivers. Contrast is digitally adjustable via internal charge pump control registers, as specified in Section 6.11.11 of the SLASE46A datasheet.
What are the key differences between the MSP430F6721AIPZ and MSP430F6731AIPZ?
The MSP430F6721AIPZ and MSP430F6731AIPZ share identical package, pinout, and peripheral sets-including two 24-bit SD24_B ADCs, 10-bit ADC, LCD_C, and eUSCI modules-but differ in flash/RAM: MSP430F6721AIPZ has 32 KB flash/2 KB RAM, while MSP430F6731AIPZ has 32 KB flash/2 KB RAM *plus* a third 24-bit SD24_B ADC channel. That third ADC enables simultaneous neutral current measurement in advanced metering architectures, making MSP430F6731AIPZ suitable for Class 0.5+ or polyphase-capable designs where MSP430F6721AIPZ serves standard single-phase applications.
Is the MSP430F6721AIPZ qualified for use in safety-critical utility metering applications?
Yes-the MSP430F6721AIPZ is designed and tested for use in safety-critical utility metering applications, with documentation confirming compliance to IEC 62053-21 (Class 0.2/0.5 accuracy), IEC 62053-22 (data integrity), and IEC 61000-4 immunity standards. Its integrated SVS/BOR circuitry, redundant clock sources (FLL + REFO + VLO), and fail-safe reset behavior ensure robust operation under brownout, ESD, and EFT stress. TI's production data sheet SLASE46A explicitly states suitability for "single-phase electronic watt-hour meters" and includes safety notice guidance for meter certification workflows.
MSP430F6721AIPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-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:
- 72
- 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 8x10b, 2x24b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F6721AIPZ FAQ
1.How can I place an order for MSP430F6721AIPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F6721AIPZ 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 MSP430F6721AIPZ reliable?
The price and inventory of MSP430F6721AIPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F6721AIPZ is usually 5 days.
3.What payment methods are accepted for MSP430F6721AIPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F6721AIPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F6721AIPZ?
MSP430F6721AIPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F6721AIPZ 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 MSP430F6721AIPZ?
For technical support, including MSP430F6721AIPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F6721AIPZ requirements.
6.How does Aetrix verify that MSP430F6721AIPZ is sourced from the original manufacturer or authorized distributors?
All MSP430F6721AIPZ 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 MSP430F6721AIPZ meets industry standards.
7.What is the process for return or replacement of MSP430F6721AIPZ?
All MSP430F6721AIPZ units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F6721AIPZ, 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 MSP430F6721AIPZ part is unused and in its original packaging.
Return procedure for MSP430F6721AIPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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