STMicroelectronics ST62T52CM6

Overview

ST62T52CM6 from STMicroelectronics is an 8-bit HCMOS microcontroller with integrated 8-bit A/D converter (4 analog inputs), 128-byte RAM, 1836-byte OTP program memory, and safe reset architecture. It operates from 3.0–6.0 V at up to 8 MHz, supports -40°C to +125°C, and features 9 programmable I/O pins - five capable of 30 mA sink for direct LED/TRIAC drive - making it suitable for automotive body control modules and industrial sensor interfaces.

For engineers reviewing the ST62T52CM6 datasheet, ST62T52CM6 pinout, ST62T52CM6 application, or ST62T52CM6 equivalent, key selection considerations include its OTP-based firmware flexibility, on-chip auto-reload timer with 7-bit prescaler, digital watchdog, oscillator safe guard, and low-voltage detector - all critical for safety-critical embedded control where code immutability and deterministic reset behavior are required.

Technical Context

The ST62T52CM6 implements a Harvard-architecture 8-bit CPU core with six-level hardware stack, supporting Run/Wait/Stop power modes and five interrupt vectors including one non-maskable (NMI) input. Its memory map separates 1836-byte OTP program space, 128-byte data RAM, and optional 64-byte EEPROM (not present in this variant), accessed via a 64-byte movable Data ROM Window register (DWR).

Peripherals include dual timers: an 8-bit Timer with 7-bit prescaler and an independent 8-bit Auto-Reload Timer (ARTimer) with dedicated PB6/PB7 I/O pins for timing capture/output. The 8-bit ADC supports four analog inputs (PA4, PA5, PC2, PC3), while I/O ports support configurable pull-up, open-drain, push-pull, and analog input modes - all software-defined without external components.

Key Specifications

Pinout & Package

ST62T52CM6 is housed in a 16-pin Plastic Dual In-line Package (PDIP16), with 0.3-inch body width and standard through-hole mounting. Pin functions are validated per STMicroelectronics datasheet Rev. 4 (March 2009), Figure 2 and Section 1.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST62T62CM6, ST62T52CM6 trades EEPROM for lower unit cost and simplified qualification; versus ST62E62CDW6, it replaces UV-erasable flexibility with OTP security and production-readiness - making it the preferred choice for cost-sensitive, high-volume automotive and industrial control where firmware is fixed.

Availability

ST62T52CM6 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and appliance motor controllers requiring stable component supply across extended product lifecycles.

Supply support for ST62T52CM6 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The ST62xx family targets low-to-medium complexity embedded control applications, emphasizing cost-efficiency, robustness in harsh environments, and minimal external component count - with ST62T52CM6 optimized for OTP-based automotive and industrial control where firmware immutability and reset reliability are critical.

FAQ

Is ST62T52CM6 pin-compatible with ST62T62CM6?

Yes, ST62T52CM6 and ST62T62CM6 share identical PDIP16 packaging, pin assignments, and electrical I/O characteristics. The only functional difference is the absence of 64-byte data EEPROM in ST62T52CM6 - all registers, memory maps, and peripheral control bits remain byte-for-byte compatible, enabling drop-in replacement where EEPROM is unused.

Does ST62T52CM6 support in-circuit debugging?

No, ST62T52CM6 lacks dedicated debug interface hardware. STMicroelectronics' ST626x-EMU2 emulation system requires the ST62E62C EPROM variant or ST62T62C with test vector support; ST62T52CM6 relies on ROM-based firmware verification via external programmers and functional test fixtures.

What oscillator configurations are supported?

ST62T52CM6 supports three oscillator modes: quartz crystal (1–8 MHz), ceramic resonator (1–8 MHz), or RC network. The internal oscillator circuit drives OSCin/OSCout directly - no external capacitors required for crystal mode, though load capacitance matching is recommended per crystal manufacturer specifications.

Can the 30 mA sink I/O pins drive TRIACs directly?

Yes, PB0, PB2–PB3, PB6–PB7 are rated for 30 mA continuous sink current and feature Schmitt-trigger inputs and TTL-compatible logic levels - enabling direct gate drive of sensitive-gate TRIACs (e.g., MAC97A6) in AC load switching applications without buffer transistors.