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Texas Instruments MSP430F4794IPZ
- Part No.:
- MSP430F4794IPZ
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
MSP430F4794IPZ.pdf
- Description:
- IC MCU 16BIT 60KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
MSP430F4794IPZ from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller designed for single-phase electricity metering applications. It integrates four 16-bit sigma-delta ADCs with differential PGA inputs, 60KB+256B flash, 2.5KB RAM, and an integrated 160-segment LCD driver. Its 100-pin QFP package supports high-density analog front-end interfacing and real-time energy measurement.
For engineers reviewing the MSP430F4794IPZ datasheet, MSP430F4794IPZ pinout, MSP430F4794IPZ application, or MSP430F4794IPZ equivalent, key selection criteria include sigma-delta ADC channel count, LCD segment drive capability, ultra-low standby current (1.1 μA), and JTAG/BSL programming support in industrial metering designs.
Technical Context
The MSP430F4794IPZ implements a 16-bit RISC CPU with 62.5-ns instruction cycle time and five software-selectable low-power modes, enabling sub-6-μs wake-up from standby. Its FLL+ clock system synchronizes MCLK, SMCLK, and ACLK using internal DCO, XT1 (32.768 kHz), and optional XT2 (up to 16 MHz) sources.
Four independent SD16_A sigma-delta ADC modules each support differential input pairs, programmable gain, and built-in reference buffers - directly supporting simultaneous voltage, current, neutral, and auxiliary channel sampling in Class 0.5/1.0 electricity meters. The integrated LCD_A module drives up to 160 segments with programmable contrast control and internal voltage generation.
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 efficiency. |
| Flash / RAM | 60KB + 256B flash memory and 2.5KB RAM - sufficient for full metering firmware, calibration tables, and data logging buffers. |
| Sigma-Delta ADCs | Four independent 16-bit SD16_A converters, each with differential PGA inputs and selectable gain - enables concurrent 4-channel metrology-grade sampling. |
| Power Consumption | Active mode: 280 μA at 1 MHz/2.2 V; Standby: 1.1 μA; Off mode (RAM retention): 0.2 μA - extends battery life in portable or backup-powered meters. |
| LCD Driver | Integrated LCD_A controller supporting up to 160 segments with 1–4 multiplexing, on-chip contrast control, and internal voltage generation (V1–V5). |
| Communication Interfaces | Four USCI modules: USCI_A0/A1 (UART/IrDA/SPI) and USCI_B0/B1 (I²C/SPI) - supports HART, DLMS/COSEM, and optical port communication stacks. |
| Operating Voltage | 1.8 V to 3.6 V supply range - compatible with standard 3.3 V rails and brownout-safe operation in fluctuating utility environments. |
Pinout & Package
Package: 100-pin plastic quad flatpack (PZ), 0.5 mm pitch, RoHS-compliant, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/TA0 | Timer_A capture/compare / BSL transmit | Primary UART TX pin for bootstrap loader programming; also serves as Timer_A CCR0 input/output. |
| P1.1/TA0/MCLK | Timer_A capture / MCLK output / BSL receive | Primary UART RX pin for BSL; outputs main system clock for external synchronization or debug monitoring. |
| A0.0+ / A0.0− | SD16_A channel 0 differential analog input | Dedicated high-impedance inputs for first metrology channel; require matched PCB routing and guard traces. |
| A3.0+ / A3.0− | SD16_A channel 3 differential analog input | Fourth sigma-delta ADC input pair - distinguishes MSP430F4794IPZ from 3-channel variants (e.g., MSP430F4793IPZ). |
| COM0–COM3 | LCD backplane outputs | Four common outputs supporting 1–4 multiplex LCD configurations; enable direct drive of segmented displays without external bias ICs. |
| RST/NMI | Reset / non-maskable interrupt input | Hardware reset pin with Schmitt-trigger input; doubles as NMI source for critical fault handling (e.g., overvoltage detection). |
| TCK / TMS / TDO / TDI | JTAG boundary-scan interface | Fully compliant IEEE 1149.1 interface for production programming, emulation, and in-circuit debugging via MSP-FET430UIF. |
Key Features
| Feature | Design Value |
|---|---|
| Four 16-bit sigma-delta ADCs | Enables simultaneous sampling of voltage, current, neutral, and auxiliary channels in polyphase-capable single-phase meters without external ADCs. |
| Integrated 160-segment LCD driver | Eliminates external LCD bias ICs and reduces BOM cost; supports dynamic contrast adjustment for varying ambient light conditions. |
| Ultra-low-power standby mode (1.1 μA) | Permits long-term battery-backed operation during power outages while retaining RAM and real-time clock state. |
| Hardware multiplier (32×32) | Accelerates RMS, harmonic, and tariff calculations in firmware - critical for meeting IEC 62053-21/22 real-time processing requirements. |
| USCI modules with IrDA and auto-baud UART | Supports optical port communication per IEC 62056-21 and automatic baud rate detection for legacy meter interfaces. |
| Programmable SVS with adjustable threshold | Allows configurable brownout detection level to prevent erroneous metering during voltage sags or dips in unstable grids. |
Applications
| Electricity Meter Front-End | Smart Grid Data Concentrator |
|---|---|
|
Use Scenario: High-accuracy Class 0.5 single-phase electricity meter with tamper detection, tariff switching, and LCD display. IC Role / Device Role / Timing Role: Primary metrology MCU performing simultaneous 4-channel sigma-delta conversion, RMS computation, LCD refresh, and serial communication. Use Value: Integrated ADCs and LCD driver reduce component count by ≥5 discrete ICs; ultra-low standby current enables >10-year battery life in backup mode. |
Use Scenario: Substation-level data concentrator aggregating consumption data from 100+ endpoint meters via RS-485 and optical ports. IC Role / Device Role / Timing Role: Protocol gateway MCU managing DLMS/COSEM stack, secure storage, and dual-USCI-based multi-port bridging. Use Value: Four USCI modules allow concurrent UART (optical), SPI (secure element), I²C (RTC/sensor), and RS-485 transceiver control without external logic. |
| Portable Energy Analyzer | Prepayment Meter Controller |
|
Use Scenario: Handheld field tester measuring voltage, current, harmonics, and power factor across residential circuits. IC Role / Device Role / Timing Role: Real-time signal processor capturing synchronized samples at 8–16 kS/s per channel using SD16_A oversampling and digital filtering. Use Value: Hardware multiplier and 2.5KB RAM enable on-device harmonic analysis (up to 40th order) and waveform storage without external DSP. |
Use Scenario: Pay-as-you-go meter with keypad input, credit validation, relay control, and LCD balance display. IC Role / Device Role / Timing Role: Secure application controller executing encrypted credit validation, EEPROM wear leveling, and anti-tamper logic. Use Value: Built-in security fuse and BSL password protection prevent unauthorized firmware access; LCD_A driver supports custom symbol rendering for prepaid status indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F4793IPZ | Same 100-pin QFP package and peripherals, but only three sigma-delta ADCs and 2KB RAM. | Targeted for lower-cost Class 1.0 meters without neutral current monitoring or advanced harmonic analysis. | Select when fourth ADC channel and extra 512B RAM are not required - reduces cost while maintaining pin compatibility. |
| MSP430F6779AIPZ | Successor device with enhanced SD24_B ADC (24-bit), 128KB flash, USB PHY, and improved ESD rating (±4 kV HBM). | Designed for next-generation smart meters requiring higher accuracy, USB configuration, and extended lifecycle support. | Choose for new designs needing future-proofing, higher resolution metrology, or regulatory compliance beyond IEC 62053-22. |
Compared with MSP430F4793IPZ and MSP430F6779AIPZ, the MSP430F4794IPZ delivers optimal balance of proven metrology performance, mature toolchain support, and cost-effective 4-channel analog integration - making it ideal for volume production of certified single-phase meters.
Availability
MSP430F4794IPZ is available at Aetrix Electronics and suitable for electricity metering, portable energy analyzers, and prepayment meter controllers requiring stable component supply, long-term industrial temperature support, and traceable manufacturing history.
Supply support for MSP430F4794IPZ 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 50 years of innovation in precision measurement and low-power design.
The MSP430F47xx product line was engineered specifically for single-phase electricity metering, integrating metrology-grade ADCs, LCD drivers, and ultra-low-power operation to meet IEC 62053 standards without external support ICs.
FAQ
What is the maximum sigma-delta ADC sampling rate supported by the MSP430F4794IPZ?
The MSP430F4794IPZ SD16_A modules support up to 128 ksps aggregate sampling across all four channels using oversampling and digital filtering. Each individual ADC achieves effective resolution up to 16 bits at 1–4 ksps depending on gain setting and filter configuration - validated for IEC 62053-22 Class 0.5 accuracy in production meters.
Does the MSP430F4794IPZ support JTAG debugging and in-system programming?
Yes, the MSP430F4794IPZ includes full IEEE 1149.1 JTAG support via pins TCK, TMS, TDO, and TDI. It is fully compatible with TI's MSP-FET430UIF debugger and supports flash programming, real-time variable watch, and breakpoint debugging - essential for metrology algorithm validation and certification testing.
How does the LCD_A controller in the MSP430F4794IPZ generate bias voltages?
The MSP430F4794IPZ LCD_A module uses internal charge-pump circuitry and resistor-divider networks to generate up to five LCD bias voltages (V1–V5) from DVCC. LCDCAP/R33 pin connects an external capacitor to stabilize the charge pump, while P5.5–P5.7 configure analog levels for contrast control - eliminating need for external voltage dividers or bias ICs.
Can the MSP430F4794IPZ operate from a 3.3 V supply while driving a 4-mux LCD display?
Yes, the MSP430F4794IPZ operates across 1.8 V to 3.6 V and supports 1–4 multiplex LCD configurations at 3.3 V. At this voltage, the internal LCD charge pump delivers sufficient VLCD swing for reliable segment contrast in 4-mux mode - confirmed in TI application report SLAA325B for meter display validation.
What is the purpose of the A3.0+/A3.0− pins on the MSP430F4794IPZ?
A3.0+ and A3.0− are the dedicated differential analog inputs for the fourth sigma-delta ADC channel (SD16_A channel 3). Their presence distinguishes the MSP430F4794IPZ from 3-channel variants like MSP430F4793IPZ and enables simultaneous acquisition of auxiliary signals such as neutral current or temperature-compensation references in advanced metering designs.
MSP430F4794IPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- MSP430x4xx
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPU16
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SCI, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, LCD, POR, PWM, WDT
- Number of I/O:
- 72
- Program Memory Size:
- 60KB (60K x 8 + 256B)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2.5K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 4x16b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F4794IPZ FAQ
1.How can I place an order for MSP430F4794IPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F4794IPZ 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 MSP430F4794IPZ reliable?
The price and inventory of MSP430F4794IPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F4794IPZ is usually 5 days.
3.What payment methods are accepted for MSP430F4794IPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F4794IPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F4794IPZ?
MSP430F4794IPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F4794IPZ 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 MSP430F4794IPZ?
For technical support, including MSP430F4794IPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F4794IPZ requirements.
6.How does Aetrix verify that MSP430F4794IPZ is sourced from the original manufacturer or authorized distributors?
All MSP430F4794IPZ 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 MSP430F4794IPZ meets industry standards.
7.What is the process for return or replacement of MSP430F4794IPZ?
All MSP430F4794IPZ units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F4794IPZ, 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 MSP430F4794IPZ part is unused and in its original packaging.
Return procedure for MSP430F4794IPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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