STMicroelectronics ST62T62CM3

Overview

ST62T62CM3 from STMicroelectronics is an 8-bit HCMOS microcontroller with integrated 8-bit A/D converter (4 analog inputs), 64 bytes of data EEPROM, 128 bytes of RAM, auto-reload timer, digital watchdog, and safe reset circuitry - designed for automotive sensor interfaces, appliance control panels, and industrial I/O modules operating from 3.0–6.0 V at -40 to +125°C.

For engineers reviewing the ST62T62CM3 datasheet, ST62T62CM3 pinout, ST62T62CM3 application, or ST62T62CM3 equivalent, this device supports direct LED/TRIAC drive (5 I/O lines sinking up to 30 mA), programmable power-saving modes (Run/Wait/Stop), and on-chip oscillator compatibility with quartz, ceramic resonator, or RC network - critical for cost-sensitive embedded control where code flexibility and non-volatile data retention are required.

Technical Context

The ST62T62CM3 implements a Harvard-architecture 8-bit CPU core with 12-bit program counter, six-level hardware stack, and memory-mapped peripheral registers. Its on-chip peripherals include two independent timers: an 8-bit Timer with 7-bit prescaler and an 8-bit Auto-Reload Timer (ARTimer) with dedicated PB6/PB7 pins for input capture and output compare functions.

It features a 4-channel 8-bit successive-approximation ADC with internal reference, configurable I/O ports supporting analog input, interrupt-on-change, open-drain/push-pull output, and internal pull-up selection per pin. Reset management includes Power-on Reset, Low Voltage Detector (LVD), and Oscillator Safe Guard - all enabled via user-programmable option byte.

Key Specifications

Pinout & Package

ST62T62CM3 is housed in a 16-pin plastic DIP (PDIP16) package with 0.3-inch body width and through-hole mounting. Pin assignments follow STMicroelectronics' standard ST62xx pinout layout for mechanical and thermal compatibility across the family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST62T52CM3, ST62T62CM3 adds 64 bytes of EEPROM for field calibration data retention; compared with ST62E62C, it replaces UV-erasable EPROM with OTP, eliminating UV equipment dependency while maintaining identical runtime behavior and pin compatibility.

Availability

ST62T62CM3 is available at Aetrix Electronics and suitable for automotive cabin control, home appliance UI management, and industrial sensor interface applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ST62T62CM3 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 MEMS sensors for industrial, automotive, and consumer markets.

The ST62xx family delivers cost-optimized 8-bit MCUs targeting low-to-medium complexity embedded control - emphasizing integration of analog peripherals (ADC), non-volatile data storage (EEPROM), and robust reset/safety features for harsh environments.

FAQ

What is the maximum clock frequency supported by ST62T62CM3?

The ST62T62CM3 supports a maximum clock frequency of 8 MHz, achievable using an external quartz crystal, ceramic resonator, or RC network connected to the OSCin/OSCout pins. This frequency defines the upper limit of instruction execution speed and ADC sampling rate, and is validated across the full -40°C to +125°C operating temperature range.

Does ST62T62CM3 include a hardware watchdog timer?

Yes, ST62T62CM3 integrates a digital watchdog timer that must be periodically cleared by firmware to prevent system reset. It operates independently of the main CPU clock and provides fail-safe recovery from software lockups, with timeout duration determined by internal prescaler settings configured at startup.

How is the 64-byte EEPROM accessed in ST62T62CM3?

The 64-byte EEPROM is mapped into the data space and accessed via the Data RAM Bank Register (DRBR) at address E8h. When DRBR bit 0 is set, EEPROM page 0 becomes active; reads/writes use standard MOV instructions to addresses 00h–3Fh in data space, with write cycles requiring proper timing and EECTL register setup per the datasheet.

Can ST62T62CM3 drive LEDs directly without external transistors?

Yes - five I/O lines (PB0, PB2, PB3, PB6, PB7) are rated to sink up to 30 mA each, enabling direct connection of standard LEDs or low-power TRIAC gates. This capability eliminates discrete driver components in applications like status indicators or small AC load switching, reducing bill-of-materials cost and board space.