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Texas Instruments MSP430F6638IPZR
- Part No.:
- MSP430F6638IPZR
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
MSP430F6638IPZR.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
MSP430F6638IPZR from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller featuring 256 KB flash, 16 KB + 2 KB RAM, USB 2.0 interface, dual 12-bit DACs, 12-bit ADC with 16 channels (12 external, 4 internal), and integrated LCD driver for up to 160 segments. It operates from 1.8 V to 3.6 V and supports real-time clock with battery backup - used in portable energy meters and handheld industrial sensors.
For engineers reviewing the MSP430F6638IPZR datasheet, MSP430F6638IPZR pinout, MSP430F6638IPZR application, or MSP430F6638IPZR equivalent, key selection criteria include USB integration, 74 GPIO count, LPM3.5 RTC current (1.1 µA), 3 µs wake-up time, and LQFP-100 package compatibility with legacy MSP430F6xx layouts.
Technical Context
The MSP430F6638IPZR implements a 16-bit RISC CPU with constant generators and a digitally controlled oscillator (DCO), enabling 3 µs wake-up from LPM3 standby. Its unified clock system integrates FLL stabilization, XT1 (32-kHz crystal), XT2 (up to 32 MHz), REFO, and VLO sources - supporting simultaneous USB, ADC, and LCD operation without external timing components.
Peripherals include four 16-bit timers (TA0/TA1/TA2/TB0), two USCIs (USCI_A0/A1 for UART/IrDA/SPI; USCI_B0/B1 for I²C/SPI), hardware multiplier, 6-channel DMA, and RTC_B with alarm and battery backup. The device uses an integrated LDO with programmable core voltage and supply supervision for robust low-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with constant generators and 20-MHz max system clock - enables efficient C code execution and deterministic interrupt latency. |
| Memory | 256 KB flash + 16 KB RAM + 2 KB USB SRAM - supports firmware updates, data logging, and USB endpoint buffering without external memory. |
| USB Interface | Full-speed USB 2.0 PHY with integrated 3.3-V/1.8-V power system and USB-PLL - eliminates need for external transceiver or voltage regulators. |
| ADC | 12-bit SAR ADC with 200 ksps, 16-channel autoscan (12 external, 4 internal), and shared reference - enables simultaneous sensor acquisition across analog front ends. |
| Low-Power Modes | LPM3.5 draws 1.1 µA at 3.0 V with RTC active; LPM4.5 draws 0.3 µA - extends battery life in always-on metering and monitoring applications. |
| I/O Count | 74 GPIO pins in LQFP-100 package - supports high-pin-count interfaces including LCD segment drivers, SPI peripherals, and multi-sensor signal conditioning. |
| DAC | Dual 12-bit voltage-output DACs with synchronization - provides precise analog stimulus generation for calibration and closed-loop control. |
Pinout & Package
LQFP-100 package (14 mm × 14 mm) with exposed thermal pad; 100-pin square outline, 0.5-mm pitch, lead-free finish per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST/NMI/SBWTDIO | Reset / Non-maskable interrupt / Spy-Bi-Wire debug input | Single-pin multifunction interface for reset assertion, NMI triggering, and 2-wire JTAG debugging - reduces PCB footprint and simplifies test access. |
| P1.0–P1.7 | General-purpose I/O with interrupt capability | 8-bit port supporting edge-triggered interrupts and Schmitt-trigger inputs - suitable for pushbutton sensing and digital event capture. |
| USB_DP / USB_DM | Full-speed USB differential data pair | Integrated ESD protection and impedance-matched routing - meets USB 2.0 full-speed electrical compliance without external termination resistors. |
| XT1IN / XT1OUT | Low-frequency crystal oscillator terminals | Supports 32.768-kHz watch crystal for RTC accuracy ±20 ppm - enables calendar timekeeping with battery backup during main power loss. |
| VCC / DVCC / AVCC | Power supply rails | DVCC (digital core), AVCC (analog reference), and VCC (I/O) are separately routed - minimizes noise coupling between digital switching and precision analog circuits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB-PHY and power system | Eliminates external USB transceiver and dual LDOs - reduces BOM cost and board area by ~12 mm² in portable USB-connected devices. |
| Unified clock system with FLL | Enables automatic frequency stabilization of DCO using XT1 or XT2 reference - removes need for manual calibration and supports dynamic clock scaling. |
| RTC_B with battery backup switch | Maintains calendar time and alarms during main power failure using VBAT rail - critical for energy meter tamper detection and timestamped event logging. |
| LCD_B driver (160 segments) | Direct drive of multiplexed LCD without external bias generator - supports custom alphanumeric displays in thermostats and handheld testers. |
| Hardware multiplier (MPY32) | Executes 32-bit multiply in single cycle - accelerates FFT, PID, and sensor compensation algorithms in real-time embedded firmware. |
Applications
| Energy Metering | Industrial Handheld Tester |
|---|---|
|
Use Scenario: Three-phase electricity meter with tariff switching, tamper detection, and USB data download. IC Role / Device Role / Timing Role: Main controller executing metrology firmware, managing real-time clock, driving LCD display, and handling USB mass storage class communication. Use Value: Integrated RTC_B with battery backup ensures accurate time stamping of consumption events during power outages; USB 2.0 enables field technician data retrieval without proprietary cables. |
Use Scenario: Portable multimeter with analog/digital sensor inputs, backlit LCD, and PC configuration via USB. IC Role / Device Role / Timing Role: Central MCU acquiring ADC samples, processing measurements, rendering UI on LCD, and acting as USB CDC device for host communication. Use Value: Dual 12-bit DACs generate precision calibration references; 74 GPIO support multiple sensor interfaces and button matrix scanning without external expanders. |
| Smart Thermostat | Remote Sensor Node |
|
Use Scenario: Battery-powered HVAC controller with temperature/humidity sensing, LCD UI, and scheduled heating cycles. IC Role / Device Role / Timing Role: Low-power system controller managing sleep/wake cycles, reading sensors via ADC, updating LCD segments, and maintaining RTC calendar. Use Value: LPM3.5 mode (1.1 µA) extends CR2032 battery life beyond 5 years; integrated LCD_B driver eliminates external display controller IC. |
Use Scenario: Wireless environmental monitor with analog sensor array, local data logging, and USB-based firmware update. IC Role / Device Role / Timing Role: Data acquisition hub performing autoscan ADC reads, storing results in RAM/flash, and presenting as USB mass storage device. Use Value: 12-bit ADC with internal reference and 16-channel autoscan captures multiple sensor outputs per wakeup; 256 KB flash stores firmware and extended logs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power mixed-signal microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSP430F6637IPZ | 192 KB flash, same 16 KB + 2 KB RAM, identical peripherals and pinout - differs only in flash size. | Suitable where firmware image fits within 192 KB and cost reduction is prioritized over future firmware headroom. | Select when application firmware size is confirmed ≤192 KB and BOM cost optimization is required without changing layout or software stack. |
| MSP430F6636IPZ | 128 KB flash, same RAM and peripheral set - matches MSP430F6638IPZR in USB, ADC, DAC, RTC, and LCD features. | Targeted at cost-sensitive designs with smaller firmware footprints and no requirement for >128 KB flash expansion. | Choose for production units where flash usage is ≤128 KB and long-term availability of LQFP-100 variant is preferred over newer packages. |
Compared with MSP430F6637IPZ and MSP430F6636IPZ, the MSP430F6638IPZR provides maximum flash capacity (256 KB) for complex firmware with USB device stacks, secure boot, and data encryption - making it optimal for field-upgradable, feature-rich endpoints where future firmware growth is anticipated.
Availability
MSP430F6638IPZR is available at Aetrix Electronics and suitable for energy metering, industrial handheld testers, and smart thermostats requiring stable component supply and long-lifecycle support.
Supply support for MSP430F6638IPZR 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 low-power design.
The MSP430F6638IPZR belongs to TI's MSP430F6xx ultra-low-power MCU family, engineered for battery-operated measurement systems demanding precision analog integration, USB connectivity, and multi-year runtime on coin-cell batteries.
FAQ
What is the maximum operating frequency of the MSP430F6638IPZR?
The MSP430F6638IPZR supports a maximum system clock frequency of 20 MHz, achieved via its digitally controlled oscillator (DCO) stabilized by the integrated FLL loop using XT1 or XT2 crystal references. This frequency enables real-time signal processing while maintaining ultra-low active-mode current of 270 µA/MHz at 3.0 V - verified in TI's SLAS566G datasheet Section 8.20.
Does the MSP430F6638IPZR support USB device functionality without external components?
Yes, the MSP430F6638IPZR integrates a full-speed USB 2.0 PHY, USB-PLL, and dedicated 3.3-V/1.8-V power system - enabling USB device operation with only standard USB connector and ESD protection diodes. No external transceiver, voltage regulators, or clock sources are required, as confirmed in Section 1 and Figure 4-1 of the SLAS566G datasheet.
How many analog input channels does the ADC12_A module support on the MSP430F6638IPZR?
The ADC12_A module on the MSP430F6638IPZR supports 16 total input channels: 12 external analog inputs (A0–A11) and 4 internal sources (temperature sensor, VCC/2, VREF, and VMID). This configuration is explicitly listed in Table 6-1 and Section 8.37–8.42 of the SLAS566G datasheet.
What low-power modes are available on the MSP430F6638IPZR, and what is the lowest current draw?
The MSP430F6638IPZR offers five low-power modes (LPM0–LPM4.5). The lowest active-retention mode is LPM4.5, drawing 0.3 µA at 3.0 V with all clocks disabled and RAM retained. For RTC operation, LPM3.5 draws 1.1 µA at 3.0 V - values measured per Section 8.5 and confirmed in TI's SLAS566G specification table.
Is the MSP430F6638IPZR pin-compatible with other devices in the MSP430F663x family?
Yes, the MSP430F6638IPZR in the LQFP-100 (PZ) package shares identical pinout and electrical characteristics with MSP430F6637IPZ and MSP430F6636IPZ - as verified in Figure 7-1 and Table 6-1 of SLAS566G. This allows direct substitution within the same footprint when flash requirements permit.
MSP430F6638IPZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- MSP430F6xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- MSP430 CPUXV2
- Core Size:
- 16-Bit
- Speed:
- 20MHz
- Connectivity:
- I2C, IrDA, LINbus, SCI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 74
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 18K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F6638IPZR FAQ
1.How can I place an order for MSP430F6638IPZR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F6638IPZR 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 MSP430F6638IPZR reliable?
The price and inventory of MSP430F6638IPZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F6638IPZR is usually 5 days.
3.What payment methods are accepted for MSP430F6638IPZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F6638IPZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F6638IPZR?
MSP430F6638IPZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F6638IPZR 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 MSP430F6638IPZR?
For technical support, including MSP430F6638IPZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F6638IPZR requirements.
6.How does Aetrix verify that MSP430F6638IPZR is sourced from the original manufacturer or authorized distributors?
All MSP430F6638IPZR 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 MSP430F6638IPZR meets industry standards.
7.What is the process for return or replacement of MSP430F6638IPZR?
All MSP430F6638IPZR units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F6638IPZR, 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 MSP430F6638IPZR part is unused and in its original packaging.
Return procedure for MSP430F6638IPZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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