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STMicroelectronics STM692AM6E
- Part No.:
- STM692AM6E
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
STM692AM6E.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,907
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Product details
Overview
STM692AM6E from STMicroelectronics is a 5 V microprocessor supervisory IC with integrated battery switchover, active-low and active-high reset outputs, watchdog timer, and power-fail comparator - designed for non-volatile SRAM (LPSRAM) backup in industrial embedded systems. It guarantees RST assertion down to VCC = 1.0 V, features 200 ms typical reset timeout (trec), 1.6 s typical watchdog timeout, and consumes only 40 µA typical supply current.
For engineers reviewing the STM692AM6E datasheet, STM692AM6E pinout, STM692AM6E application, or STM692AM6E equivalent, key selection criteria include guaranteed reset assertion at low VCC, automatic VCC-to-VBAT switchover threshold (VSO), push-pull RST/RST output drive, PFI/PFO power-fail signaling, and compatibility with external LPSRAM write-protection schemes.
Technical Context
The STM692AM6E implements a precision voltage reference and comparator to monitor VCC against a fixed reset threshold (VRST ≈ 4.63 V), asserting RST/RST when VCC drops below VRST or during MR assertion or watchdog timeout. Its internal P-channel MOSFET switch enables seamless switchover from VCC to VBAT on VOUT when VCC falls below VSO - defined as the lesser of VBAT and VRST - ensuring maximum battery life.
It integrates a 1.6 s typ watchdog timer cleared by WDI edge transitions, a push-pull PFO output triggered by either PFI < VPFI (≈ 2.25 V) or VCC < 2.4 V, and dual reset outputs with trec timing governed by an internal oscillator. All RST and RST pins are push-pull, eliminating need for external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 5 V nominal; operates across full industrial range without regulation. |
| Reset threshold (VRST) | 4.63 V (typ); ensures reliable MCU reset before brownout affects logic. |
| Reset timeout (trec) | 200 ms (typ); provides sufficient hold time for system stabilization after power-up or fault recovery. |
| Watchdog timeout | 1.6 s (typ); detects stalled firmware with minimal false triggers under transient noise. |
| VCC-to-VBAT switchover (VSO) | Lesser of VBAT or VRST; maximizes primary supply usage before engaging battery. |
| Supply current (ICC) | 40 µA (typ); enables long-term operation in battery-backed systems without significant drain. |
| Battery supply current (IBAT) | 0.4 µA (typ); preserves backup battery life during extended VCC loss. |
| Operating temperature | –40 °C to +85 °C; qualified for industrial-grade embedded deployment. |
Pinout & Package
STM692AM6E is housed in an SO8 (Small Outline 8-pin) package with standard 1.27 mm pitch, RoHS-compliant lead-free finish, and JEDEC MS-012AC mechanical outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main supply input | Primary 5 V rail; powers internal circuitry and feeds VOUT when above VSO. |
| VBAT | Backup battery input | Connects to Li-ion or coin cell; supplies VOUT when VCC drops below VSO. |
| VOUT | SRAM supply output | Switched output delivering VCC or VBAT to external LPSRAM VDD pin. |
| RST | Active-low reset output | Push-pull, asserted low during fault; drives MCU /RESET directly without pull-up. |
| RST | Active-high reset output | Push-pull, asserted high during fault; compatible with processors requiring active-high reset. |
| PFI | Power-fail input | Monitors auxiliary rail; triggers PFO low if VPFI < 2.25 V or VCC < 2.4 V. |
| PFO | Power-fail output | Push-pull signal indicating imminent main supply collapse; used for graceful shutdown. |
| WDI | Watchdog input | Edge-sensitive; resets watchdog timer on rising/falling transition; float to disable. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | RST (active-low) and RST (active-high) eliminate external level-shifting or pull resistors. |
| Automatic battery switchover | VOUT switches from VCC to VBAT at VSO = min(VBAT, VRST), extending battery service life. |
| Low-power supervision | 40 µA typical ICC and 0.4 µA typical IBAT enable multi-year backup operation. |
| Integrated power-fail comparator | PFI/PFO pair provides early warning of VCC collapse, enabling data save before shutdown. |
| Guaranteed reset down to 1.0 V | RST remains valid even during deep brownout, ensuring MCU reset integrity. |
| Watchdog with edge-triggered clear | WDI accepts >50 ns pulses; immune to noise-induced false clears; float disables function. |
Applications
| Industrial PLC Memory Backup | Medical Device Data Retention |
|---|---|
|
Use Scenario: Maintaining volatile configuration and runtime data in programmable logic controllers during AC mains interruption. IC Role / Device Role / Timing Role: Supervises 5 V system rail, asserts RST on brownout, and switches VOUT to backup battery to sustain LPSRAM. Use Value: Prevents loss of calibration tables and I/O state during 100–500 ms grid dips, meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Preserving patient therapy parameters and sensor history in portable infusion pumps during battery swap or charging interruption. IC Role / Device Role / Timing Role: Monitors main 5 V DC-DC output and triggers PFO to initiate EEPROM save before VCC decay crosses 2.4 V. Use Value: Enables deterministic 200 ms trec window for safe flash write completion prior to full power loss. |
| Point-of-Sale Terminal NVRAM | Smart Meter Firmware Integrity |
|
Use Scenario: Securing transaction logs and tax registers in retail terminals powered by unregulated wall adapters subject to line surges and sags. IC Role / Device Role / Timing Role: Uses WDI to detect frozen application processor and forces RST reset; VOUT sustains SRAM during recovery. Use Value: Eliminates manual reboot requirement after lockup, reducing field service calls by >70% in deployed units. |
Use Scenario: Protecting firmware update buffers and metering registers in ANSI C12.22-compliant electricity meters during utility-side voltage instability. IC Role / Device Role / Timing Role: Combines PFI monitoring and RST assertion to halt flash programming if VCC drops mid-write. Use Value: Prevents partial firmware corruption and ensures atomic update success, satisfying ANSI C12.22 Section 7.3.2.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Same 5 V operation, 4.63 V reset threshold, and 200 ms trec; lacks PFI/PFO and battery switchover. | No VOUT switching or battery management; requires external diode-OR for backup. | Select when only basic reset supervision is needed and backup SRAM is not required. |
| TPS3823MPW | 3.3 V only; 2.93 V reset threshold; no battery switchover or PFI/PFO; includes manual reset input. | Not pin-compatible; incompatible voltage domain; no LPSRAM support. | Choose only for 3.3 V systems where cost and footprint are prioritized over dual-reset and battery features. |
Compared with MAX692AESA+ and TPS3823MPW, STM692AM6E uniquely integrates battery switchover, dual reset polarity, and power-fail signaling in a single SO8 package - making it the only option for compact, self-contained 5 V LPSRAM backup designs requiring guaranteed sub-1.0 V reset validity and industrial temperature operation.
Availability
STM692AM6E is available at Aetrix Electronics and suitable for industrial PLC memory backup, medical device data retention, point-of-sale terminal NVRAM, and smart meter firmware integrity applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for STM692AM6E 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 STM69x/70x/80x supervisor family targets robust, low-power system-level monitoring in space-constrained industrial and medical devices - emphasizing reliability, battery longevity, and seamless integration with external SRAM.
FAQ
What is the reset threshold voltage and tolerance for STM692AM6E?
The STM692AM6E has a nominal reset threshold (VRST) of 4.63 V with ±2.5% tolerance over temperature and supply variations. This value is factory-trimmed and guaranteed across –40 °C to +85 °C, ensuring consistent brownout detection without external resistor dividers.
Can STM692AM6E operate without a backup battery connected?
Yes - VBAT can be tied directly to VCC if no battery is used. In this configuration, VOUT remains connected to VCC at all times, and all supervision functions (reset, watchdog, PFI/PFO) operate normally. The device draws only 40 µA typical supply current in this mode.
How does the watchdog timer interact with the reset outputs?
A watchdog timeout asserts both RST (low) and RST (high) simultaneously for the full trec duration (200 ms typ). The timer is cleared only by WDI edge transitions or active reset assertion - not by VCC recovery alone - ensuring locked firmware is forcibly reset regardless of supply behavior.
Is STM692AM6E pin-compatible with other members of the STM69x family?
Yes - STM692AM6E shares identical SO8 pinout and footprint with STM690A, STM703, STM704, STM802, STM805, and STM817. Key functional differences (e.g., presence of WDI, PFI/PFO, or E/ECON) do not affect physical layout or PCB design, enabling drop-in validation across variants.
STM692AM6E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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
STM692AM6E FAQ
1.How can I place an order for STM692AM6E through Aetrix?
Please submit a Request for Quotation (RFQ) for STM692AM6E 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 STM692AM6E reliable?
The price and inventory of STM692AM6E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM692AM6E is usually 5 days.
3.What payment methods are accepted for STM692AM6E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM692AM6E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM692AM6E?
STM692AM6E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM692AM6E 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 STM692AM6E?
For technical support, including STM692AM6E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM692AM6E requirements.
6.How does Aetrix verify that STM692AM6E is sourced from the original manufacturer or authorized distributors?
All STM692AM6E 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 STM692AM6E meets industry standards.
7.What is the process for return or replacement of STM692AM6E?
All STM692AM6E units undergo pre-shipment inspection (PSI). If there is an issue with STM692AM6E, 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 STM692AM6E part is unused and in its original packaging.
Return procedure for STM692AM6E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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