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Texas Instruments TMS370C777AFNT
- Part No.:
- TMS370C777AFNT
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
TMS370C777AFNT.pdf
- Description:
- 8-BIT, OTPROM, TMS370 CPU
- Quantity:
- Payment:
- Shipping:
Inventory:3,415
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Product details
Overview
TMS370C777AFNT from Texas Instruments is an 8-bit OTP EPROM microcontroller with 24K-byte program memory, 512-byte RAM, 256-byte data EEPROM, and integrated 8-channel 8-bit ADC1 - designed for automotive and industrial real-time control applications requiring reprogrammability without windowed packaging.
For engineers reviewing the TMS370C777AFNT datasheet, TMS370C777AFNT pinout, TMS370C777AFNT application, or TMS370C777AFNT equivalent, key selection criteria include its 68-pin PLCC package, divide-by-4/divide-by-1 clock options with PLL support, STANDBY/HALT low-power modes, register-to-register architecture with 256 general-purpose registers, and software-configurable I/O pins.
Technical Context
The TMS370C777AFNT implements a register-to-register CPU architecture eliminating accumulator bottlenecks, supporting 14 addressing modes and upward instruction compatibility across the TMS370 family. Its memory map unifies program, data, peripheral, and interrupt vectors in a Von Neumann structure with 512-byte RAM (0000h–01FFh), 24K-byte EPROM (2000h–7FFFh), and 256-byte EEPROM (1F00h–1FFFh).
Peripheral integration includes two 16-bit timers (Timer1 with 8-bit prescaler, Timer2A), a 24-bit watchdog timer, and ADC1 with eight analog inputs (AN0–AN7) mapped to Port E pins. All I/O ports (A–G, D) are software-configurable bidirectional pins, with dedicated functions like T1PWM, T2AIC2/PWM, and SYSCLK on Port D.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit register-to-register CPU with 256 general-purpose registers and 14 addressing modes - enables direct arithmetic between any two registers without accumulator dependency. |
| Program Memory | 24K-byte one-time-programmable (OTP) EPROM - supports in-circuit programming via 13 V on MC pin; split into 16K-byte (2000h–5FFFh) and 8K-byte (6000h–7FFFh) arrays. |
| Data Memory | 512-byte static RAM (0000h–01FFh) + 256-byte data EEPROM (1F00h–1FFFh) - retains data during power-off; block-level write protection controlled by WPR register. |
| Analog Interface | 8-channel 8-bit ADC1 with configurable analog inputs AN0–AN7 - maps to Port E pins; supports external reference via VCC3/VSS3 pins. |
| Timing & Power | 5 V ±10% supply; PLL-enabled clock options: divide-by-4 (0.5–5 MHz SYSCLK) or divide-by-1 (2–5 MHz SYSCLK); STANDBY (oscillator/timer active) and HALT (full stop) low-power modes. |
| I/O & Packaging | 68-pin plastic leaded chip carrier (PLCC); 46 bidirectional + 9 input pins across Ports A–G and D; all peripheral pins software-configurable as digital I/O. |
Pinout & Package
Package: 68-pin plastic leaded chip carrier (PLCC), FN/FZ designation, surface-mount compatible with standard PLCC sockets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1, VCC2, VCC3 | Power supply inputs | VCC1 powers core logic; VCC2 powers digital I/O; VCC3 supplies ADC1 positive reference - enables independent noise isolation for analog section. |
| VSS1, VSS2, VSS3 | Ground references | VSS1 grounds digital logic; VSS2 grounds digital I/O; VSS3 grounds ADC1 - supports separate analog/digital ground planes for noise reduction. |
| XTAL1 / XTAL2/CLKIN | Oscillator interface | XTAL1 output for crystal; XTAL2/CLKIN input for crystal or external clock - supports internal oscillator or bypass mode for system clock flexibility. |
| RESET | System reset control | Bidirectional: input initializes MCU; open-drain output asserts on watchdog timeout or oscillator fault - provides fail-safe system recovery signaling. |
| MC | Mode control | Enables EEPROM/EPROM write-protection override when 12–13 V applied - required for in-circuit programming without removing device. |
| AN0–AN7 / E0–E7 | Analog input / port | Eight ADC1 channels mapped to Port E pins; configurable as general-purpose inputs if not used for analog conversion - simplifies mixed-signal design reuse. |
| T1PWM / T2AIC2/PWM | PWM output | Timer1 and Timer2A PWM outputs - support motor control, LED dimming, or power regulation with software-timed duty cycles. |
| INT1/NMI, INT2, INT3 | Interrupt inputs | Three external interrupt sources with NMI capability - enable responsive event handling for sensor triggers, communication framing, or fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| OTP EPROM Program Memory | 24K-byte one-time-programmable EPROM enables low-volume production updates without mask costs - ideal for prototyping and short-run automotive ECUs. |
| Software-Configurable I/O | All peripheral function pins (ADC, PWM, timers, interrupts) are software-mappable to any I/O port - eliminates fixed-function pin constraints and simplifies PCB layout reuse. |
| Two Low-Power Modes | STANDBY (oscillator + timer active) and HALT (full stop) modes retain RAM and peripheral state - extends battery life in remote sensors and telematics modules. |
| Memory-Mapped Peripheral File | 256-byte peripheral file (1000h–10FFh) with frame-based register access (e.g., P010 for system control) - enables consistent, scalable driver development across TMS370 family. |
| Register-to-Register Architecture | Direct ALU operations between any two of 256 registers (e.g., ADD R24,R47) eliminate accumulator bottlenecks - improves code density and deterministic execution timing. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Controller |
|---|---|
Use Scenario: Real-time monitoring of engine RPM, throttle position, and coolant temperature in gasoline engine management systems. IC Role / Device Role / Timing Role: Primary 8-bit controller executing closed-loop fuel injection and spark timing algorithms using ADC1 inputs and PWM outputs. Use Value: OTP programmability allows field calibration updates; STANDBY mode supports wake-on-key events; 5 V tolerance ensures robustness in vehicle electrical environments. | Use Scenario: Closed-loop speed and current regulation for 3-phase BLDC motors in HVAC blowers and conveyor drives. IC Role / Device Role / Timing Role: System controller interfacing with gate drivers, reading current-sense ADCs, and generating commutation timing via T1PWM/T2AIC2. Use Value: Dual 16-bit timers with prescaler support precise PWM generation; software-configurable I/O simplifies adaptation to different motor feedback topologies. |
| Telecom Line Card Monitor | Consumer Appliance Main Controller |
Use Scenario: Supervision of power supply voltages, temperature, and fan status on telecom line cards operating in NEBS-compliant cabinets. IC Role / Device Role / Timing Role: Standalone monitor IC performing periodic ADC1 readings, watchdog supervision, and alarm reporting over UART or discrete outputs. Use Value: 24-bit watchdog ensures fail-safe shutdown; industrial temperature range (–40°C to +85°C) guarantees reliability in uncooled chassis environments. | Use Scenario: Central control of washing machine cycles including water level sensing, heater control, and drum motor sequencing. IC Role / Device Role / Timing Role: Main MCU managing user interface, safety interlocks, and real-time motor control using ADC1 for pressure transducer inputs and PWM for heater duty cycling. Use Value: 256-byte data EEPROM stores cycle history and calibration offsets; HALT mode reduces standby power during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMS370C077AFNT | 24K-byte mask-ROM program memory instead of OTP EPROM; no in-circuit reprogramming capability. | Suitable only for high-volume, stable-code deployments where mask cost is justified; lacks field update flexibility. | Select when firmware is finalized and production volume exceeds 50k units/year to amortize mask cost. |
| SE370C777FNT | Windowed ceramic CLCC package enabling UV-erasable reprogramming; identical OTP EPROM functionality but with physical reprogrammability. | Used exclusively in lab/prototype environments for iterative firmware development; not qualified for production due to reliability characterization limits. | Select only for pre-production validation; not recommended for final BOM due to lack of production reliability data. |
Compared with TMS370C077AFNT, the TMS370C777AFNT trades mask-ROM permanence for field-updatable OTP EPROM, while SE370C777FNT adds physical reprogrammability at the cost of production qualification - making TMS370C777AFNT the optimal choice for low-to-mid volume automotive and industrial control where firmware updates are anticipated.
Availability
TMS370C777AFNT is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom line card monitors, and consumer appliance main controllers requiring stable component supply and long-term lifecycle support.
Supply support for TMS370C777AFNT 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 microcontroller innovation.
The TMS370Cx7x product line delivers cost-effective real-time control for automotive, industrial, and telecom applications through integrated peripherals, flexible memory options (ROM/OTP EPROM/EEPROM), and low-power operation - targeting systems needing deterministic response and field-programmable firmware.
FAQ
What is the maximum operating frequency of the TMS370C777AFNT?
The TMS370C777AFNT supports two clock configurations: divide-by-4 mode (0.5–5 MHz SYSCLK) and divide-by-1 mode with PLL (2–5 MHz SYSCLK). Its maximum system clock frequency is 5 MHz, corresponding to 1.25 MIPS at divide-by-4 or 5 MIPS at divide-by-1 - verified in the SPNS034C datasheet Section 2.3 under "Clock Options".
Does the TMS370C777AFNT support in-circuit programming of its EPROM memory?
Yes, the TMS370C777AFNT supports in-circuit programming of its 24K-byte OTP EPROM memory. This requires applying 13 V to the MC pin to override write protection, then using the EPCTLL (P01E) and EPCTLM (P01C) control registers - as detailed in Section 12 of the SPNS034C datasheet under "Program EPROM".
How many analog input channels does the TMS370C777AFNT ADC1 module provide?
The TMS370C777AFNT integrates ADC1 with exactly eight analog input channels (AN0 through AN7), each mapped to Port E pins (E0–E7). These can be configured as general-purpose inputs if unused for analog conversion - confirmed in the "Pin Descriptions" table on page 2 of SPNS034C.
What low-power modes are available on the TMS370C777AFNT and how do they differ?
The TMS370C777AFNT offers STANDBY and HALT low-power modes. In STANDBY, the CPU halts but the oscillator and Timer1 remain active; in HALT, all activity stops while retaining RAM and peripheral configuration. Both modes preserve data across wake events - specified in Section 5 of SPNS034C under "Low-Power Modes".
Is the TMS370C777AFNT pin-compatible with other devices in the TMS370Cx7x family?
Yes, the TMS370C777AFNT shares identical pinout and package (68-pin PLCC) with TMS370C077AFNT and SE370C777FNT per the FN/FZ and JN package drawings in SPNS034C pages 1–2. All three devices use the same signal assignments, power pin locations (VCC1/VCC2/VCC3, VSS1/VSS2/VSS3), and peripheral pin mappings.
TMS370C777AFNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Series:
- TMS370
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
TMS370C777AFNT FAQ
1.How can I place an order for TMS370C777AFNT through Aetrix?
Please submit a Request for Quotation (RFQ) for TMS370C777AFNT 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 TMS370C777AFNT reliable?
The price and inventory of TMS370C777AFNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMS370C777AFNT is usually 5 days.
3.What payment methods are accepted for TMS370C777AFNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMS370C777AFNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMS370C777AFNT?
TMS370C777AFNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMS370C777AFNT 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 TMS370C777AFNT?
For technical support, including TMS370C777AFNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMS370C777AFNT requirements.
6.How does Aetrix verify that TMS370C777AFNT is sourced from the original manufacturer or authorized distributors?
All TMS370C777AFNT 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 TMS370C777AFNT meets industry standards.
7.What is the process for return or replacement of TMS370C777AFNT?
All TMS370C777AFNT units undergo pre-shipment inspection (PSI). If there is an issue with TMS370C777AFNT, 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 TMS370C777AFNT part is unused and in its original packaging.
Return procedure for TMS370C777AFNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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