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Texas Instruments MSP430F6638CY
- Part No.:
- MSP430F6638CY
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- Die
- Datasheet:
-
MSP430F6638CY.pdf
- Description:
- IC MCU 16BIT 256KB FLASH DIESALE
- Quantity:
- Payment:
- Shipping:
Inventory:2,792
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Product details
Overview
MSP430F6638CY from Texas Instruments is an ultra-low-power 16-bit 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), and integrated LCD driver for up to 160 segments - deployed in battery-powered sensor systems and portable meters.
For engineers reviewing the MSP430F6638CY datasheet, MSP430F6638CY pinout, MSP430F6638CY application, or MSP430F6638CY equivalent, key selection criteria include USB PHY integration, RTC with battery backup, LPM3.5 current of 1.1 µA, 74 GPIO count, and full-speed USB endpoint configuration supporting eight IN/OUT endpoints.
Technical Context
The MSP430F6638CY implements a 16-bit RISC CPU with constant generators and hardware multiplier for 32-bit operations, paired with five low-power modes optimized for extended battery life. Its unified clock system integrates FLL, VLO, REFO, XT1 (32-kHz), and XT2 (up to 32 MHz) sources with automatic frequency stabilization.
Peripherals include four 16-bit timers (TA0 with 5 CC registers; TA1/TA2 with 3 each; TB0 with 7), two USCIs supporting UART/IrDA/SPI (USCI_A) and I²C/SPI (USCI_B), and a dedicated USB module with integrated 3.3-V/1.8-V power system, USB-PLL, and 8B backup RAM - all operating from a single 1.8–3.6 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC CPU with hardware multiplier supporting 32-bit arithmetic - enables efficient signal processing in resource-constrained embedded firmware. |
| Flash / RAM | 256 KB flash + 16 KB main RAM + 2 KB USB SRAM - sufficient for USB stack, real-time control, and data logging without external memory. |
| USB Interface | Full-speed (12 Mbps) USB 2.0 with integrated PHY, 3.3-V/1.8-V power system, and 8 endpoint buffers - eliminates need for external transceiver or voltage regulators. |
| ADC/DAC | 12-bit ADC (200 ksps, 16-channel autoscan) + dual 12-bit synchronized DACs - supports simultaneous analog acquisition and waveform generation for closed-loop control. |
| Low-Power Modes | LPM3.5 (RTC active, crystal running): 1.1 µA at 3.0 V; LPM4.5 (shutdown): 0.3 µA - enables multi-year operation on coin-cell batteries in metering applications. |
| I/O Count | 74 GPIO pins across 10 ports (P1–P9, PJ), with configurable drive strength, Schmitt-trigger inputs, and interrupt capability per pin - supports complex sensor interfacing and display control. |
| LCD Driver | Integrated LCD_B module driving up to 160 segments with programmable contrast - reduces BOM cost and PCB area in handheld displays. |
Pinout & Package
The MSP430F6638CY is packaged in a 100-pin LQFP (PZ) with 14 mm × 14 mm body size, exposing 74 functional I/O pins plus power, reset, JTAG/SBW, and crystal connections.
| 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 - simplifies board layout and test access. |
| XIN / XOUT | Low-frequency crystal oscillator terminals | Connects to 32.768-kHz watch crystal for RTC accuracy and LPM3/LPM3.5 operation with sub-µA retention current. |
| XT2IN / XT2OUT | High-frequency crystal oscillator terminals | Supports up to 32-MHz crystal or external clock source for high-speed USB and CPU operation with FLL-based stabilization. |
| DP / DM | USB differential data pair | Full-speed USB 2.0 physical layer signals routed directly to USB connector - no external transceiver required. |
| VCC / DVCC / AVCC | Power supply rails | DVCC (digital core), AVCC (analog reference), and VCC (I/O) are separate but internally regulated - improves noise immunity for mixed-signal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB-PHY and power system | Eliminates external USB transceiver and dual-voltage regulators - reduces component count and layout complexity in portable USB devices. |
| RTC with battery backup and alarm | Retains time/date and triggers wake-up events during LPM3.5 shutdown mode using external VBAT supply - enables precise scheduling without host intervention. |
| Dual synchronized 12-bit DACs | Generates matched analog outputs with programmable timing alignment - essential for differential signal generation and calibration in sensor front-ends. |
| Hardware CRC16 engine | Offloads checksum computation from CPU during firmware updates or data transmission - improves system responsiveness and data integrity. |
| 6-channel DMA controller | Enables peripheral-to-memory and memory-to-peripheral transfers without CPU involvement - critical for high-throughput ADC sampling and USB data streaming. |
Applications
| Smart Energy Metering | Portable Medical Monitor |
|---|---|
|
Use Scenario: Battery-powered electricity/water/gas meter with real-time consumption logging, tamper detection, and optical/USB data upload. IC Role / Device Role: Main system controller handling metrology ADC sampling, RTC timestamping, LCD display, and USB firmware updates. Use Value: Ultra-low LPM3.5 current (1.1 µA) extends battery life beyond 10 years; integrated USB avoids external PHY and reduces BOM cost by $0.45+. |
Use Scenario: Handheld pulse oximeter or blood glucose monitor requiring analog sensor conditioning, LCD display, and PC connectivity. IC Role / Device Role: Single-chip solution managing photodiode/ADC signal chain, LCD segment driving, USB HID communication, and button interface. Use Value: Dual 12-bit DACs enable precise LED current control for SpO₂ measurement; 160-segment LCD driver eliminates external display controller. |
| Industrial Sensor Node | Programmable Thermostat |
|
Use Scenario: Wireless temperature/humidity/pressure node with local display, push-button UI, and USB configuration port. IC Role / Device Role: Central MCU executing sensor fusion, LCD refresh, capacitive touch decoding, and USB CDC virtual COM port. Use Value: Four 16-bit timers support concurrent PWM fan control, IR remote decode, and sensor polling; USCI_B0 provides I²C to external sensors. |
Use Scenario: Residential HVAC thermostat with ambient sensing, 4-line LCD, rotary encoder, relay drivers, and USB programming interface. IC Role / Device Role: Primary controller managing temperature ADC, LCD contrast, RTC-based scheduling, and USB parameter configuration. Use Value: Integrated comparator and voltage reference enable direct thermistor measurement; LPM3 wake-up in 3 µs ensures responsive UI interaction. |
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 except reduced flash - no functional or pinout difference. | Suitable where firmware size < 192 KB; identical USB, ADC, DAC, and LCD capabilities. | Select when firmware footprint allows margin below 192 KB - offers same feature set at lower cost. |
| MSP430F6636IPZ | 128 KB flash, otherwise identical peripheral set and pinout - shares same LQFP-100 package and electrical specs. | Targeted at cost-sensitive designs with smaller code base; retains full USB, RTC, and LCD functionality. | Choose for budget-constrained metering or display applications where flash > 128 KB is unnecessary. |
Compared with MSP430F6638CY, the MSP430F6637IPZ and MSP430F6636IPZ offer identical I/O count, USB PHY, RTC, and LCD driver functionality in the same LQFP-100 package - differing only in flash capacity (256 KB → 192 KB → 128 KB) while maintaining full pin compatibility and low-power performance.
Availability
MSP430F6638CY is available at Aetrix Electronics and suitable for smart energy metering, portable medical monitors, industrial sensor nodes, programmable thermostats, and handheld test equipment requiring stable component supply and long-term lifecycle support.
Supply support for MSP430F6638CY 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 applications.
The MSP430F6638CY belongs to TI's ultra-low-power 16-bit MCU family designed specifically for battery-operated measurement and sensing systems where extended runtime, mixed-signal integration, and USB connectivity are critical.
FAQ
What is the maximum system clock frequency supported by the MSP430F6638CY?
The MSP430F6638CY supports a maximum system clock frequency of 20 MHz via its FLL-controlled DCO or up to 32 MHz when using the high-frequency XT2 crystal oscillator with appropriate configuration. This enables full-speed USB operation at 12 Mbps and real-time processing of ADC samples at 200 ksps without bottlenecking.
Does the MSP430F6638CY include an integrated USB physical layer?
Yes, the MSP430F6638CY integrates a full-speed USB 2.0 PHY, 3.3-V and 1.8-V USB power system, and USB-PLL - allowing direct connection to a USB connector without external transceivers or voltage regulators. This is confirmed in the device description and functional block diagram (Figure 4-1).
How many analog input channels does the MSP430F6638CY ADC support?
The MSP430F6638CY features a 12-bit ADC12_A module with 16 total input channels: 12 external analog inputs (A0–A11) and 4 internal sources (temperature sensor, VCC/2, VREF, and VMID). All channels support autoscan mode for unattended sequential conversion.
What low-power modes are available on the MSP430F6638CY, and what is the lowest active-retention current?
The MSP430F6638CY supports five low-power modes (LPM0–LPM4.5). The lowest active-retention mode is LPM3.5 (RTC active with crystal), drawing 1.1 µA at 3.0 V. LPM4.5 (full shutdown) consumes only 0.3 µA at 3.0 V - both values are specified in the "Features" section and Table 8-5 of the datasheet.
Is the MSP430F6638CY pin-compatible with other members of the MSP430F663x family?
Yes, the MSP430F6638CY in the 100-pin LQFP (PZ) package shares identical pinout and electrical characteristics with MSP430F6637IPZ and MSP430F6636IPZ - confirmed by the shared functional block diagram (Figure 4-1) and Device Comparison table showing identical I/O count and package options.
MSP430F6638CY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- MSP430F6xx
- Packaging:
- Tray
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MSP430F6638CY FAQ
1.How can I place an order for MSP430F6638CY through Aetrix?
Please submit a Request for Quotation (RFQ) for MSP430F6638CY 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 MSP430F6638CY reliable?
The price and inventory of MSP430F6638CY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSP430F6638CY is usually 5 days.
3.What payment methods are accepted for MSP430F6638CY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSP430F6638CY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSP430F6638CY?
MSP430F6638CY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSP430F6638CY 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 MSP430F6638CY?
For technical support, including MSP430F6638CY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSP430F6638CY requirements.
6.How does Aetrix verify that MSP430F6638CY is sourced from the original manufacturer or authorized distributors?
All MSP430F6638CY 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 MSP430F6638CY meets industry standards.
7.What is the process for return or replacement of MSP430F6638CY?
All MSP430F6638CY units undergo pre-shipment inspection (PSI). If there is an issue with MSP430F6638CY, 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 MSP430F6638CY part is unused and in its original packaging.
Return procedure for MSP430F6638CY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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