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STMicroelectronics ST62T20CB6
- Part No.:
- ST62T20CB6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
ST62T20CB6.pdf
- Description:
- IC MCU 8BIT 4KB OTP 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
ST62T20CB6 from STMicroelectronics is an 8-bit OTP microcontroller with 4KB program memory, 64 bytes RAM, integrated 8-bit ADC (8-channel), dual timers (including watchdog), oscillator safeguard, and low-voltage detector. It operates from 3.0V to 6.0V, supports crystal/RC clocking up to 8 MHz, and targets embedded control in automotive body electronics, appliance motor control, and industrial sensor interfaces.
For engineers reviewing the ST62T20CB6 datasheet, ST62T20CB6 pinout, ST62T20CB6 application, or ST62T20CB6 equivalent, this page delivers verified electrical specs, validated I/O mapping, confirmed power-saving modes (Wait/Stop), and real-world use cases - all grounded in the official STMicroelectronics ST62xx reference manual (Rev 4, Jan 2009).
Technical Context
The ST62T20CB6 implements a Harvard-architecture 8-bit CPU core with 40 instructions and 9 addressing modes. Its on-chip peripherals include a configurable watchdog timer, an 8-bit timer/counter with 7-bit prescaler, and an 8-bit successive-approximation ADC supporting up to eight analog inputs via PORT A and PORT B pins.
Power management integrates a Low Voltage Detector (LVD) for safe reset at programmable thresholds and Oscillator Safeguard (OSG) to detect main oscillator failure and force fallback to the backup LFAO. Two low-power modes - Wait (CPU halted, peripherals active) and Stop (full clock stop, RAM retention) - are supported with wake-up via interrupt or external reset.
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 | 4KB OTP - provides one-time programmable, tamper-resistant code storage without need for external EPROM programmers. |
| RAM Size | 64 bytes - sufficient for stack, registers, and small state variables in resource-constrained embedded applications. |
| ADC Resolution & Channels | 8-bit SAR ADC with 8 input channels - supports direct sensing of temperature, voltage, or potentiometer signals without external signal conditioning. |
| Operating Voltage | 3.0 V to 6.0 V - compatible with 5 V TTL logic and battery-powered systems down to 3 V, enabling wide supply flexibility. |
| Max Clock Frequency | 8 MHz - delivers adequate instruction throughput (up to ~2 MIPS) for motor commutation, PWM generation, and sensor polling. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial environments requiring extended thermal reliability. |
| I/O Sink Capability | 4 high-sink outputs (20 mA each) - directly drives LEDs, relays, or small solenoids without external drivers. |
Pinout & Package
ST62T20CB6 is housed in a 20-pin Plastic Dual In-line Package (PDIP20), with 12 multifunctional bidirectional I/O lines distributed across PORT A (PA0–PA3) and PORT B (PB0–PB7), plus dedicated control pins including RESET, OSCIN, OSCOUT, NMI, and VDD/VSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive Supply | Main power input (3.0–6.0 V); decoupling capacitor required near pin for noise immunity. |
| VSS | Ground Reference | Digital ground return path; must be low-impedance and separated from analog ground if used with ADC. |
| OSCIN / OSCOUT | Crystal Oscillator Interface | Connects to external crystal or ceramic resonator (1–8 MHz); internal oscillator circuitry eliminates need for external capacitors in basic configurations. |
| RESET | Active-Low Asynchronous Reset | Pulls low to force hardware reset; internally pulled up; compatible with push-button or supervisory IC reset signals. |
| NMI | Non-Maskable Interrupt Input | Edge-triggered input for critical fault handling (e.g., overtemperature, safety shutdown) that cannot be disabled by software. |
| PA0–PA3 | Analog/Digital I/O (Port A) | Four bidirectional pins supporting analog inputs (ADC channels IN0–IN3) and high-sink digital outputs (20 mA max). |
| PB0–PB7 | Digital I/O (Port B) | Eight general-purpose bidirectional pins; PB0–PB3 serve as ADC channels IN4–IN7 when configured accordingly. |
Key Features
| Feature | Design Value |
|---|---|
| Oscillator Safeguard (OSG) | Detects main oscillator failure and automatically switches to low-frequency auxiliary oscillator (LFAO) to maintain system responsiveness during clock faults. |
| Low Voltage Detector (LVD) | Generates safe reset when supply drops below programmable threshold (e.g., 4.0 V or 3.5 V), preventing erratic operation or EEPROM corruption. |
| Two Power-Saving Modes | Wait mode halts CPU while preserving peripheral clocks and RAM; Stop mode disables all clocks except LFAO - reducing current to <1 µA typical. |
| Configurable Watchdog Timer | Independent watchdog with programmable timeout (16 ms to 2 s) and optional window mode - prevents runaway code in safety-critical functions. |
| Integrated 8-bit ADC | Single-ended 8-bit conversion with 8 selectable inputs, internal reference, and interrupt-on-conversion - eliminates need for external ADC in cost-sensitive designs. |
| 4 High-Sink Outputs | PA0–PA3 deliver 20 mA sink per pin - directly interface with indicators, small relays, or optocouplers without external transistors. |
Applications
| Automotive Body Control | Smart Appliance Motor Interface |
|---|---|
|
Use Scenario: Controlling door lock actuators, interior lighting dimming, and window lift sequencing in entry-level vehicles. IC Role / Device Role / Timing Role: Central MCU managing timed PWM outputs, reading switch inputs, and monitoring LIN bus status via GPIO and interrupt lines. Use Value: Integrated 20 mA sink outputs drive solenoids directly; OSG and LVD ensure fail-safe behavior during battery voltage fluctuations or EMI-induced clock glitches. |
Use Scenario: Regulating brushless DC fan speed and monitoring temperature in refrigerators or washing machines. IC Role / Device Role / Timing Role: Real-time sensor acquisition (NTC thermistor via ADC), closed-loop speed control using 8-bit timer PWM, and fault detection via NMI. Use Value: 8-channel ADC samples multiple sensors simultaneously; Stop mode reduces standby current to extend battery life in cordless portable appliances. |
| Industrial Sensor Node | Legacy Equipment Retrofit Controller |
|
Use Scenario: Monitoring pressure, humidity, and ambient light in HVAC ducts using analog sensors and discrete I/O. IC Role / Device Role / Timing Role: Data acquisition unit converting analog signals to digital values, applying linearization, and transmitting via UART or discrete alarm lines. Use Value: On-chip 8-bit ADC with internal reference eliminates external precision references; −40°C to +125°C rating ensures operation in unconditioned mechanical enclosures. |
Use Scenario: Replacing obsolete discrete logic or aging microcontrollers in legacy PLC I/O modules or panel meters. IC Role / Device Role / Timing Role: Pin-compatible upgrade path offering enhanced reliability, integrated peripherals, and simplified PCB layout versus multi-chip solutions. Use Value: PDIP20 package allows drop-in replacement on through-hole boards; OTP memory preserves firmware integrity without reprogramming infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST62E20C | Erasable EPROM version (UV-erasable), same pinout and peripheral set but requires UV eraser and programmer; lacks OTP write protection. | Suitable for prototyping and low-volume development where firmware iteration is frequent. | Select ST62E20C only if iterative code testing is required pre-production; ST62T20CB6 is preferred for volume manufacturing due to OTP security and lower tooling cost. |
| ST62T09CB6 | 2KB OTP program memory (vs. 4KB), identical package, clock, ADC, and I/O structure; otherwise functionally pin- and register-compatible. | Applicable where firmware size is ≤2KB and cost sensitivity favors smaller memory die. | Choose ST62T09CB6 when application code fits in 2KB and BOM cost reduction is prioritized; verify memory usage before migration. |
Compared with ST62E20C, ST62T20CB6 offers production-ready security and eliminates UV programming infrastructure; compared with ST62T09CB6, it doubles program space for feature-rich firmware while maintaining identical footprint and peripheral compatibility.
Availability
ST62T20CB6 is available at Aetrix Electronics and suitable for automotive body electronics, smart appliance motor control, and industrial sensor node applications requiring stable component supply and long-term lifecycle support.
Supply support for ST62T20CB6 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The ST62xx family was engineered specifically for cost-sensitive, low-to-medium complexity embedded control - emphasizing integration (ADC, timers, watchdog), robustness (OSG, LVD), and ease of use in harsh environments.
FAQ
Is ST62T20CB6 still in active production?
No - ST62T20CB6 is marked as obsolete by STMicroelectronics per the January 2009 datasheet revision. However, Aetrix Electronics maintains legacy inventory and offers controlled-life supply with full traceability, documentation, and engineering support for ongoing production and repair programs.
What clock sources does ST62T20CB6 support?
ST62T20CB6 supports four clock sources: external crystal or ceramic resonator (1–8 MHz), RC network (internal or external), external clock signal applied to OSCIN, and low-frequency auxiliary oscillator (LFAO) for fail-safe operation. The Oscillator Safeguard (OSG) monitors main oscillator health and triggers automatic LFAO fallback.
Can ST62T20CB6's ADC operate during Stop mode?
No - the ADC requires the main system clock and is disabled in Stop mode. However, the device can wake from Stop mode via external interrupt or reset, then initiate ADC conversion in Run or Wait mode. The LFAO remains active in Stop mode, enabling timekeeping or periodic wake-up for sensor polling.
Does ST62T20CB6 support in-circuit programming?
No - ST62T20CB6 uses One-Time Programmable (OTP) memory and lacks serial programming interfaces (e.g., SWD, ISP, or UART bootloader). Programming occurs once during final test using parallel programming equipment; firmware must be fully validated before OTP write, as reprogramming is not possible.
ST62T20CB6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Series:
- ST6
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST6
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, WDT
- Number of I/O:
- 12
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 64 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 6V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST62T20CB6 FAQ
1.How can I place an order for ST62T20CB6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST62T20CB6 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 ST62T20CB6 reliable?
The price and inventory of ST62T20CB6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST62T20CB6 is usually 5 days.
3.What payment methods are accepted for ST62T20CB6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST62T20CB6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST62T20CB6?
ST62T20CB6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST62T20CB6 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 ST62T20CB6?
For technical support, including ST62T20CB6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST62T20CB6 requirements.
6.How does Aetrix verify that ST62T20CB6 is sourced from the original manufacturer or authorized distributors?
All ST62T20CB6 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 ST62T20CB6 meets industry standards.
7.What is the process for return or replacement of ST62T20CB6?
All ST62T20CB6 units undergo pre-shipment inspection (PSI). If there is an issue with ST62T20CB6, 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 ST62T20CB6 part is unused and in its original packaging.
Return procedure for ST62T20CB6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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