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STMicroelectronics ST62T03CM3
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- Part No.:
- ST62T03CM3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ST62T03CM3.pdf
- Description:
- IC MCU 8BIT 1KB OTP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
ST62T03CM3 from STMicroelectronics is an 8-bit OTP microcontroller with integrated 8-bit ADC (4-channel), dual timer system (watchdog + 8-bit counter/prescaler), oscillator safeguard, and low-voltage detector. It features 1KB program memory, 64 bytes RAM, 9 I/O lines (3 high-sink at 20mA), and operates from 3.0V to 6.0V across –40°C to +125°C - used in automotive body control modules for sensor signal conditioning and actuator timing.
For engineers reviewing the ST62T03CM3 datasheet, ST62T03CM3 pinout, ST62T03CM3 application, or ST62T03CM3 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative options for industrial and automotive embedded designs.
Technical Context
The ST62T03CM3 implements a Harvard-architecture 8-bit CPU core with 40 instructions and 9 addressing modes. Its clock system supports crystal/ceramic resonator (up to 8MHz), RC network, external clock, and backup LFAO - all monitored by Oscillator Safeguard (OSG) to detect failure and force safe reset.
Interrupt handling includes 4 vectors plus NMI and RESET, servicing 9 external interrupt lines across two vectors. Power management provides Wait and Stop modes, with LVD-triggered reset ensuring operation integrity below 2.7V (typical) during brown-out conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit Harvard CPU with 40 instructions and 9 addressing modes - enables compact firmware and deterministic timing for real-time control loops. |
| Program Memory | 1KB OTP - provides one-time programmable, cost-effective code storage with read-out protection for production firmware security. |
| RAM Size | 64 bytes - sufficient for register shadowing, stack depth (up to 6 levels), and small variable sets in resource-constrained applications. |
| ADC Resolution | 8-bit with 4 analog inputs - supports direct interfacing to temperature sensors, potentiometers, and battery voltage monitors without external signal conditioning. |
| Max Clock Frequency | 8MHz - delivers 1µs instruction cycle time for sub-millisecond response in motor commutation or PWM generation. |
| Supply Voltage Range | 3.0V to 6.0V - compatible with 5V automotive and industrial bus systems, eliminating need for external LDO in many designs. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive environments and industrial motor drives requiring extended thermal margin. |
Pinout & Package
ST62T03CM3 is housed in a 16-pin SOIC (SO16) package with 1.27mm pitch, JEDEC MS-012AC compliant, and 10.2mm × 7.5mm footprint. Pin functions are validated per ST's Doc ID 4563 Rev 5 (Section 2, Figure 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3.0–6.0V supply rail; decoupling capacitor required within 10mm for stable ADC and oscillator operation. |
| VSS | Ground reference | Digital ground return; must be connected to system GND plane with low-inductance path to minimize noise coupling into analog inputs. |
| OSCIN / OSCOUT | Crystal/resonator interface | Differential crystal oscillator pins; support 32kHz–8MHz crystals; OSG monitors frequency loss to trigger fail-safe reset. |
| RESET | Asynchronous active-low reset | Hardware reset input; internal pull-up; asserts full chip reset on falling edge, including RAM and peripheral registers. |
| NMI | Non-maskable interrupt | Edge-triggered interrupt source for critical events (e.g., overtemperature fault) that cannot be disabled by software. |
| PA0–PA3 | Port A bidirectional I/O | PA1–PA3 support 20mA sink capability - drive LEDs, relays, or low-side MOSFET gates directly without buffer stages. |
| PB0–PB7 | Port B bidirectional I/O | PB0/PB1 serve as analog inputs (AIN0/AIN1); PB3, PB5–PB7 also support analog input - enable 4-channel ADC sampling from mixed-signal peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| Oscillator Safeguard (OSG) | Monitors main oscillator frequency in real time; forces hardware reset if clock stops or drifts beyond ±30%, preventing runaway code execution. |
| Low Voltage Detector (LVD) | Generates internal reset when VDD drops below 2.7V (typ), ensuring reliable shutdown before logic corruption or ADC misreads occur. |
| High-Sink I/O Outputs | Three pins (PA1–PA3) deliver 20mA sink current - eliminate external driver transistors for indicator LEDs or solenoid coils. |
| Two Independent Timers | Separate 8-bit timer/counter (with 7-bit prescaler) and configurable watchdog - enable precise PWM generation while maintaining system-level fault recovery. |
| 4-Channel 8-bit ADC | Single-ended inputs on PB0, PB1, PB3, PB5–PB7 - sample battery voltage, cabin temperature, and throttle position simultaneously with <13µs conversion time. |
Applications
| Automotive Door Module | Industrial Thermostat Controller |
|---|---|
Use Scenario: Monitoring window switch status, mirror position, and interior light dimming in vehicle door assemblies. IC Role / Device Role / Timing Role: Central MCU executing state machine logic, debouncing mechanical inputs, and generating PWM for LED backlighting. Use Value: Integrated 20mA-sink outputs drive indicator LEDs directly; 4-channel ADC reads potentiometer-based mirror angle and ambient light sensor - reducing BOM count by 3 discrete components. |
Use Scenario: Regulating HVAC fan speed and valve position based on thermistor readings and user-set temperature thresholds. IC Role / Device Role / Timing Role: Sensor interface MCU acquiring analog temperature data, comparing against setpoints, and outputting timed control pulses to TRIAC drivers. Use Value: LVD ensures safe shutdown during brown-out events common in building power systems; OSG prevents erratic behavior if crystal fails due to vibration or aging. |
| Appliance Motor Control | Smart Meter Sensor Node |
Use Scenario: Commutating BLDC motors in washing machine drum drives using hall-effect feedback and current sensing. IC Role / Device Role / Timing Role: Real-time timing controller managing 3-phase gate drive sequencing and overcurrent detection via ADC sampling. Use Value: 8MHz max clock enables 125ns timer resolution for precise 20kHz PWM carrier generation; 64-byte RAM accommodates PID coefficients and error history buffers. |
Use Scenario: Collecting voltage, current, and temperature telemetry from utility meter front-end circuits for wireless transmission. IC Role / Device Role / Timing Role: Low-power acquisition node entering STOP mode between 1-second ADC sampling intervals to extend battery life. Use Value: STOP mode draws only 1.2µA (typ) at 3.3V - extends CR2032 battery life to >5 years; built-in watchdog ensures recovery from unexpected lockups in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST62T25C | 2KB OTP memory, same 64B RAM, identical peripherals and pinout - differs only in program size and option byte configuration. | Supports larger firmware images (e.g., added communication stacks or calibration tables) without PCB redesign. | Select when firmware exceeds 1KB or future scalability is required; drop-in replacement with no layout change. |
| STM8S003F3P6 | Enhanced 8-bit core (3-stage pipeline), 8KB Flash, 1KB RAM, 10-bit ADC, and SWIM debug interface - not pin-compatible. | Enables USB HID, LIN bus, or advanced diagnostics not feasible on ST62 architecture. | Choose for new designs needing higher performance, debug visibility, or longer product lifecycle; requires schematic and firmware rework. |
Compared with ST62T03CM3, ST62T25C offers immediate memory headroom with zero hardware change, while STM8S003F3P6 delivers modern toolchain support and richer peripherals at the cost of full redesign - making ST62T03CM3 optimal for cost-sensitive, volume automotive replacements where legacy compatibility is mandatory.
Availability
ST62T03CM3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial thermostat controllers, and appliance motor timing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ST62T03CM3 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 ICs, sensors, and automotive-grade components since 1987.
The ST62xx family was engineered specifically for cost-sensitive, high-reliability embedded control in automotive and industrial environments - emphasizing robustness, low power, and minimal external component count.
FAQ
Is ST62T03CM3 pin-compatible with ST62T00CM3 or ST62T01CM3?
Yes - all ST62TxxC variants in SO16 share identical pinout and electrical characteristics. ST62T00C has 1KB ROM, ST62T01C has 2KB OTP, and ST62T03C has 1KB OTP; only program memory type and size differ. No PCB change is needed when migrating between these part numbers.
Does ST62T03CM3 support in-circuit programming after soldering?
No - ST62T03CM3 uses One-Time Programmable (OTP) memory. Programming occurs pre-assembly using ST's dedicated ST62 programmer (e.g., ST62-PROG-USB). Field updates are not supported; firmware revisions require replacement of the MCU.
What is the maximum sampling rate of the 8-bit ADC?
The ADC achieves up to 15,000 samples per second (15 kSPS) under typical conditions (VDD = 5V, fCLK = 8MHz). Conversion time is 13µs per sample, and the ADC supports single-shot or free-running modes triggered by software or timer overflow.
Can the watchdog timer be disabled in firmware?
No - the watchdog timer is always enabled after reset and cannot be disabled by software. It may be refreshed via WDR instruction or configured to generate interrupt-only mode (no reset) using option byte settings, but permanent disable is not supported for safety compliance.
ST62T03CM3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Series:
- ST6
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST6
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, WDT
- Number of I/O:
- 9
- Program Memory Size:
- 1KB (1K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 64 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
ST62T03CM3 FAQ
1.How can I place an order for ST62T03CM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST62T03CM3 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 ST62T03CM3 reliable?
The price and inventory of ST62T03CM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST62T03CM3 is usually 5 days.
3.What payment methods are accepted for ST62T03CM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST62T03CM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST62T03CM3?
ST62T03CM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST62T03CM3 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 ST62T03CM3?
For technical support, including ST62T03CM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST62T03CM3 requirements.
6.How does Aetrix verify that ST62T03CM3 is sourced from the original manufacturer or authorized distributors?
All ST62T03CM3 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 ST62T03CM3 meets industry standards.
7.What is the process for return or replacement of ST62T03CM3?
All ST62T03CM3 units undergo pre-shipment inspection (PSI). If there is an issue with ST62T03CM3, 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 ST62T03CM3 part is unused and in its original packaging.
Return procedure for ST62T03CM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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