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STMicroelectronics STM802LM6F
- Part No.:
- STM802LM6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM802LM6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
STM802LM6F from STMicroelectronics is a 5 V microprocessor supervisory IC with battery switchover, NVRAM supervision for external LPSRAM, dual active-low and active-high reset outputs (RST/RST), and integrated watchdog timer (1.6 s typical timeout). It guarantees RST assertion down to VCC = 1.0 V and supports industrial temperature range (–40 °C to +85 °C) in SO8 package. Used in embedded systems requiring reliable power monitoring and SRAM backup during main supply failure.
For engineers reviewing the STM802LM6F datasheet, STM802LM6F pinout, STM802LM6F application, or STM802LM6F equivalent, key selection criteria include guaranteed reset assertion at low VCC, automatic VCC/VBAT switchover threshold (VSO), push-pull RST/RST output drive strength, watchdog timeout stability over temperature, and compatibility with external LPSRAM write-protection schemes.
Technical Context
The STM802LM6F integrates a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 4.63 V), triggering RST/RST outputs on undervoltage, watchdog timeout, or manual reset (MR). Its internal P-channel MOSFET switch enables seamless switchover from VCC to VBAT when VCC falls below VSO - defined as the lesser of VBAT and VRST - ensuring minimal disruption to LPSRAM power.
It features push-pull RST and RST outputs (no external pull-ups required), a 200 ms typical reset timeout (trec), and a 1.6 s typical watchdog timeout (tWD) cleared by WDI edge transitions. The device operates with 40 µA typical supply current and 0.4 µA typical battery supply current, supporting long-term backup operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC operating voltage | 5 V nominal; supports stable supervision across full industrial supply range. |
| Reset threshold (VRST) | 4.63 V (typ); ensures reset assertion before MCU brownout, with hysteresis for noise immunity. |
| Reset timeout (trec) | 200 ms (typ); guarantees minimum reset pulse width for reliable MCU initialization. |
| Watchdog timeout (tWD) | 1.6 s (typ); detects stalled firmware without requiring external timing components. |
| Battery switchover threshold (VSO) | Lesser of VBAT and VRST; maximizes main supply usage before engaging backup, extending battery life. |
| Supply current (ICC) | 40 µA (typ) at VCC = 5 V; minimizes main rail loading in always-on supervision circuits. |
| Battery supply current (IBAT) | 0.4 µA (typ); enables multi-year backup operation with standard coin cells. |
Pinout & Package
STM802LM6F is housed in an 8-pin SO8 (Small Outline) package with standard 1.27 mm pitch, RoHS-compliant and lead-free per EU directive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RST | Active-high reset output | Push-pull driver; asserts high during reset condition and remains high for trec after recovery. |
| 2: VOUT | LPSRAM supply output | Switched output connected to VCC or VBAT via internal MOSFET; powers external low-power SRAM. |
| 3: PFO | Power-fail output | Push-pull signal indicating imminent VCC collapse (low when VCC < 2.4 V or PFI < VPFI). |
| 4: VSS | Ground reference | Primary return path for all internal circuitry and output drivers. |
| 5: PFI | Power-fail input | Analog comparator input; triggers PFO when voltage drops below VPFI (typically 1.25 V). |
| 6: MR | Manual reset input | Active-low, internally pulled up; initiates reset on logic low and holds for trec after release. |
| 7: WDI | Watchdog input | Edge-sensitive input; clears watchdog timer on rising/falling edges; float to disable. |
| 8: VCC | Main supply input | 5 V primary power source; monitored for reset threshold violation and switchover control. |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs (RST/RST) | Simultaneous active-low and active-high push-pull signals eliminate need for external inverters or level shifters. |
| Automatic battery switchover | VOUT seamlessly transfers from VCC to VBAT when VCC drops below VSO, preserving LPSRAM data without software intervention. |
| Guaranteed reset down to 1.0 V VCC | Ensures valid reset assertion even during deep brownout, critical for fail-safe MCU recovery in unregulated supplies. |
| Low battery supply current (0.4 µA) | Enables >10-year backup operation with CR2032 cell, reducing maintenance in remote or sealed systems. |
| Integrated power-fail comparator (PFI/PFO) | Provides early warning of supply decay (e.g., capacitor discharge), allowing controlled save-to-NVRAM before shutdown. |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
Use Scenario: Main 5 V supply interruption during field operation due to transient grid drop or battery depletion. IC Role / Device Role / Timing Role: Supervisory IC asserting RST to halt CPU execution, enabling safe state capture and initiating VOUT switchover to backup battery for SRAM retention. Use Value: Prevents loss of therapy parameters and runtime logs by maintaining LPSRAM power for ≥24 hours post-main-failure. | Use Scenario: Critical drug delivery system requiring uninterrupted memory of dosage history and calibration data during AC power loss. IC Role / Device Role / Timing Role: Monitors VCC and triggers PFO alert 100 ms before reset, allowing MCU to store last-dose timestamp and motor position before RST assertion. Use Value: Meets IEC 62304 Class C safety requirement for deterministic shutdown and data integrity under power fault. |
| Smart Energy Meter | Automotive Telematics Unit |
Use Scenario: Mains-powered meter experiencing frequent short outages (<500 ms) in unstable grid environments. IC Role / Device Role / Timing Role: Uses 200 ms trec and 1.6 s watchdog to distinguish between benign transients and true failures, avoiding spurious resets. Use Value: Maintains accurate kWh accumulation and time-of-use billing data across 10,000+ outage cycles without corruption. | Use Scenario: CAN-based telematics module powered from vehicle battery subject to cranking dips (<6 V) and ignition-off drain. IC Role / Device Role / Timing Role: Asserts RST only when VCC falls below 4.63 V (not during cranking), while PFO warns of impending brownout to trigger GPS cold-start abort. Use Value: Eliminates false reboots during engine start and preserves last-known location for emergency services handoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2 | Single active-low reset only; no RST, no watchdog, no battery switchover; 4.63 V threshold same. | Suitable only for basic reset generation without SRAM backup or fault detection. | Select when cost sensitivity outweighs need for dual reset, watchdog, or battery management. |
| TPS3808G15 | Adjustable reset threshold (1.22–5.5 V); no VOUT switchover or PFI/PFO; 200 ms trec same. | Requires external circuitry for battery backup; lacks power-fail warning capability. | Choose when precise threshold tuning is needed and backup SRAM is not used. |
Compared with MAX809TRD2 and TPS3808G15, STM802LM6F uniquely integrates battery switchover, dual reset outputs, and power-fail warning in a single SO8 package-enabling compact, self-contained NVRAM supervision without external discretes or configuration resistors.
Availability
STM802LM6F is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive telematics units requiring stable component supply with long lifecycle support.
Supply support for STM802LM6F 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The STM690/703/802 family targets robust power supervision in resource-constrained embedded systems, emphasizing low quiescent current, guaranteed reset behavior under brownout, and integrated NVRAM support for mission-critical data retention.
FAQ
What is the function of the VOUT pin on STM802LM6F?
VOUT is the switched output that connects either to VCC or VBAT depending on supply status. When VCC is above the switchover voltage (VSO), VOUT is driven from VCC; when VCC falls below VSO, VOUT automatically connects to VBAT to maintain power to external LPSRAM. This enables non-volatile data retention during main supply failure without external switching circuitry.
Does STM802LM6F require external pull-up resistors on RST or RST?
No. Both RST and RST outputs are push-pull drivers with built-in output stages capable of sinking and sourcing current. They do not require external pull-up resistors and can directly interface with standard CMOS or TTL inputs of microcontrollers or FPGAs without additional components.
How does the watchdog timer behave if WDI is left floating?
When WDI is floating (high-impedance), the internal watchdog timer is disabled and no reset is generated. STMicroelectronics specifies this as the functional disable method; no external pull-up or pull-down is required. However, in noisy environments, tying WDI to VCC via a 100 kΩ resistor is recommended to prevent unintended toggling.
Can STM802LM6F supervise a 3.3 V microcontroller system?
No. STM802LM6F is designed exclusively for 5 V systems: its reset threshold is fixed at 4.63 V, VCC rating is 5.5 V max, and VOUT switching is optimized for 5 V LPSRAM. For 3.3 V supervision, ST offers the STM809 series (e.g., STM809R) with 3.08 V threshold and compatible SO8 footprint.
STM802LM6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
STM802LM6F FAQ
1.How can I place an order for STM802LM6F through Aetrix?
Please submit a Request for Quotation (RFQ) for STM802LM6F 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 STM802LM6F reliable?
The price and inventory of STM802LM6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM802LM6F is usually 5 days.
3.What payment methods are accepted for STM802LM6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM802LM6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM802LM6F?
STM802LM6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM802LM6F 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 STM802LM6F?
For technical support, including STM802LM6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM802LM6F requirements.
6.How does Aetrix verify that STM802LM6F is sourced from the original manufacturer or authorized distributors?
All STM802LM6F 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 STM802LM6F meets industry standards.
7.What is the process for return or replacement of STM802LM6F?
All STM802LM6F units undergo pre-shipment inspection (PSI). If there is an issue with STM802LM6F, 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 STM802LM6F part is unused and in its original packaging.
Return procedure for STM802LM6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM802LM6F Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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