Texas Instruments EDSTRG28PLCC

Overview

EDSTRG28PLCC from Texas Instruments is a 28-pin PLCC-packaged member of the TMS370 8-bit microcontroller family, featuring on-chip EPROM program memory, 256-byte register file RAM, and integrated ADC2 (4-channel 8-bit analog-to-digital converter). It supports 5 V ±10% operation, includes Timer 1 and Watchdog Timer, and targets embedded control in automotive climate systems and industrial motor controllers.

For engineers reviewing the EDSTRG28PLCC datasheet, EDSTRG28PLCC pinout, EDSTRG28PLCC application, or EDSTRG28PLCC equivalent, key selection considerations include its 28-pin PLCC mechanical footprint, ADC2 module with four analog inputs, 5-MHz max SYSCLK timing, software-compatible TMS370 architecture, and EPROM-based programmability for prototyping and low-volume production.

Technical Context

The EDSTRG28PLCC implements a register-to-register 8-bit CPU with single-cycle access to up to 256 bytes of on-chip register file RAM. Its peripheral set includes ADC2 (4-channel, 8-bit successive approximation), Timer 1 (16-bit with prescaler, input capture, PWM), and Watchdog Timer - all mapped into a unified memory space using memory-mapped I/O addressing.

This device belongs to the TMS370CxCx subfamily, which uses 28-pin PLCC packaging and omits data EEPROM and SCI/SPI modules. It operates at 5 V ±10%, supports 0°C to 70°C (L-grade) temperature range, and relies on external crystal or ceramic resonator for clock generation without PLL support.

Key Specifications

Pinout & Package

EDSTRG28PLCC is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC) package with J-type leads, 11.43 mm × 11.43 mm body, and 1.27 mm lead pitch. The package is RoHS-compliant per TI's 1997 manufacturing standards and designed for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS370C3C0A and TMS370C6C2A, EDSTRG28PLCC offers the optimal balance of EPROM-based prototyping capability, minimal peripheral set (ADC2 + Timer 1), and 28-pin PLCC compatibility - making it ideal for cost-sensitive, functionally focused embedded controllers where SPI or standby RAM are unnecessary.

Availability

EDSTRG28PLCC is available at Aetrix Electronics and suitable for automotive climate control, industrial motor starter, and commercial HVAC thermostat applications requiring stable component supply across extended product lifecycles.

Supply support for EDSTRG28PLCC 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and silicon technology for industrial, automotive, and consumer markets.

EDSTRG28PLCC belongs to the TMS370CxCx subfamily - designed specifically for compact, cost-optimized 8-bit control applications where ADC integration, EPROM flexibility, and PLCC mountability are prioritized over serial connectivity or EEPROM data storage.

FAQ

What is the maximum system clock frequency supported by EDSTRG28PLCC?

EDSTRG28PLCC supports a maximum SYSCLK frequency of 5 MHz, derived from an external crystal or ceramic resonator connected to XTAL1/XTAL2 pins. At this rate, Timer 1 achieves 200-ns timing resolution, enabling precise PWM generation and input capture for motor control and sensor interfacing tasks. The device does not include an internal PLL, so clock multiplication is not possible.

Does EDSTRG28PLCC include on-chip data EEPROM?

No, EDSTRG28PLCC does not include on-chip data EEPROM. As a member of the TMS370CxCx subfamily, it omits EEPROM functionality entirely - unlike other TMS370 variants such as the 'x32 or 'x36 families. Data persistence must be implemented externally using serial EEPROM or battery-backed RAM if required in the application.

Which analog input channels are available on EDSTRG28PLCC?

EDSTRG28PLCC integrates the ADC2 module, providing four analog input channels: AN0 through AN3. These map to P1.0–P1.3 pins respectively, with P1.0–P1.2 also serving as general-purpose digital I/O. AN3 is dedicated analog-only and cannot be used as a digital pin. All channels support ratio-metric conversion using either internal or external voltage reference.

Is EDSTRG28PLCC pin-compatible with other TMS370 28-pin PLCC devices?

EDSTRG28PLCC shares the same 28-pin PLCC mechanical footprint and basic power/reset/signaling pin assignments with other TMS370CxCx devices like TMS370C3C0A and TMS370C6C2A. However, functional pin mappings differ - for example, P1.0–P1.2 are ADC inputs on EDSTRG28PLCC but digital-only on TMS370C3C0A. PCB layout reuse requires verification of signal routing against each device's specific pinout table.

What development tools are supported for EDSTRG28PLCC firmware programming?

EDSTRG28PLCC firmware is programmed using standard EPROM programmers compatible with TMS370 EPROM devices, such as BP Microsystems' universal programmers. TI's CDT370 Compact Development Tool and XDS in-circuit emulator also support EDSTRG28PLCC for debugging and real-time trace, leveraging its on-chip debug interface and memory-mapped peripheral access.