Texas Instruments TMS370C712ANT

Overview

TMS370C712ANT from Texas Instruments is an 8-bit CMOS microcontroller with 8 KB on-chip EPROM program memory, 256-byte data EEPROM, 256-byte RAM, and integrated peripherals including a 16-bit general-purpose timer, 24-bit watchdog timer, and SPI interface. It operates at 2–5 MHz SYSCLK using PLL or divide-by-4 clock options and supports automotive/industrial temperature ranges. It is used in embedded control applications such as motor drive supervision and sensor-based industrial monitoring.

For engineers reviewing the TMS370C712ANT datasheet, TMS370C712ANT pinout, TMS370C712ANT application, or TMS370C712ANT equivalent, key selection considerations include its OTP EPROM programmability, dual interrupt levels with edge-selectable external interrupts, software-configurable I/O pins, and compatibility with TMS370Cx1x development tools for rapid prototyping and low-volume production.

Technical Context

The TMS370C712ANT implements a register-to-register CPU architecture with 128–256 general-purpose registers and 14 addressing modes, eliminating accumulator bottlenecks. Its memory map integrates 8 KB EPROM (6000h–7FFFh), 256-byte data EEPROM (1F00h–1FFFh), and 256-byte RAM (0000h–00FFh) in a unified Von Neumann space.

It features a flexible 16-bit timer with prescaler (enabling 24-bit real-time counting), configurable as event counter, PWM generator, input capture, or pulse accumulator. The watchdog timer supports standard or hard reset modes depending on suffix (A/B), and the SPI operates in master/slave synchronous mode with variable-length shift register support.

Key Specifications

Pinout & Package

Package: 28-pin plastic DIP (N package) or leaded chip carrier (LCC/FN package); RoHS-compliant variant TMS370C712ANT uses N package (PDIP).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with TMS370C712BNT and TMS370C312ANT, the TMS370C712ANT uniquely balances field-programmability (via OTP EPROM), nonvolatile data storage (256-byte EEPROM), and flexible clocking-making it optimal for low-to-mid volume industrial control where firmware iteration and calibration persistence matter.

Availability

TMS370C712ANT is available at Aetrix Electronics and suitable for motor control supervision, industrial sensor interfacing, automotive body electronics, and legacy PLC module upgrades requiring stable component supply and long-term obsolescence management.

Supply support for TMS370C712ANT 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 founded in 1930, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The TMS370Cx1x family-including TMS370C712ANT-was designed for cost-effective, real-time embedded control in resource-constrained environments, emphasizing peripheral integration, low-power operation, and development ecosystem maturity.

FAQ

What is the maximum operating frequency of the TMS370C712ANT?

The TMS370C712ANT supports SYSCLK frequencies from 2 MHz to 5 MHz. When using the PLL (divide-by-1 mode), the internal clock matches the crystal or external clock source up to 5 MHz. In divide-by-4 mode, the input clock must be 0.5–5 MHz to yield a 2–5 MHz SYSCLK. The device's timing specifications are validated across this full range under commercial and industrial temperature conditions.

Does the TMS370C712ANT support in-circuit programming of its EPROM?

Yes, the TMS370C712ANT supports in-circuit EPROM programming. Applying 13 V to the MC pin enables programming mode, and the EPROM control register (EPCTL at P01Ch) manages write cycles. No device removal is required-programming occurs directly on the target board, provided proper voltage sequencing and timing per the SPNS012F datasheet are observed.

How does the watchdog timer behave on the TMS370C712ANT?

The TMS370C712ANT implements a 24-bit watchdog timer configured as "standard" (suffix A), meaning timeout triggers a software-initiated reset sequence-not a hardware latch. The watchdog must be periodically cleared via the WD key register; failure results in a controlled reset that preserves RAM contents and asserts RESET low for eight SYSCLK cycles, allowing coordinated system recovery.

Can the TMS370C712ANT operate in low-power modes, and what is retained?

Yes, the TMS370C712ANT supports STANDBY and HALT low-power modes. In STANDBY, the oscillator and 16-bit timer remain active while CPU execution halts; in HALT, all clocks stop. Both modes retain full RAM contents (except registers A and B, which reset to 00h), peripheral configuration bits, and I/O states-enabling rapid wake-up with minimal initialization overhead.

Is the TMS370C712ANT pin-compatible with other TMS370Cx1x devices?

Yes, the TMS370C712ANT shares identical 28-pin PDIP (N package) pinout and register mapping with TMS370C312ANT, TMS370C012A, and other members of the TMS370Cx1x family. This allows drop-in replacement in existing designs-though functional differences (e.g., EPROM vs. ROM, EEPROM presence, watchdog type) must be verified in firmware and system-level validation.