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onsemi CAT1027WI-28-G
- Part No.:
- CAT1027WI-28-G
- Manufacturer:
- onsemi
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CAT1027WI-28-G.pdf
- Description:
- CAT1027 - DUAL VOLTAGE SUPERVISO
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
CAT1027WI-28-G from ON Semiconductor (formerly SCILLC) is a dual-voltage supervisory IC integrating a 2 kbit I²C EEPROM and precision power supply monitoring with watchdog timer functionality. It provides active-low reset output (RESET̅), auxiliary voltage sensing (VSENSE/VLOW), and manual reset capability, operating from 2.7 V to 5.5 V with 2.85–3.00 V reset threshold, 1.6 s watchdog timeout, and industrial temperature range (–40°C to +85°C). It is used in microcontroller-based embedded systems requiring brownout protection and nonvolatile configuration storage.
For engineers reviewing the CAT1027WI-28-G datasheet, pinout, applications, or equivalent options, key selection considerations include its fixed 2.85–3.00 V reset threshold, TSSOP-8 package (WI), watchdog timer interrupt (WDI) support, I²C EEPROM page write buffer, and VSENSE-triggered VLOW output for secondary supply monitoring.
Technical Context
The CAT1027WI-28-G implements a precision bandgap-based VCC monitor with hysteresis (15 mV) and guarantees valid reset assertion down to VCC = 1.0 V. Its internal 1.25 V reference drives an auxiliary comparator for VSENSE, enabling external resistor-divider–based monitoring of secondary supplies as low as 1.25 V.
It integrates a fully compliant 400 kHz I²C interface with slave address default 1010xxxR/W, supports byte and 16-byte page writes, and features hardware write protection activated during reset or low-VCC conditions. The watchdog timer is edge-triggered on WDI and times out after 1.6 s ±0.5 s if no transition occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85 V min / 3.00 V max - sets brownout detection point for 3.3 V systems |
| Watchdog Timeout | 1.6 s typical - ensures system recovery within defined window after software hang |
| I²C Clock Frequency | 400 kHz - enables fast configuration read/write without bus contention |
| EEPROM Endurance | 1,000,000 cycles - supports frequent calibration or logging updates over product lifetime |
| Data Retention | 100 years - guarantees long-term storage of critical system parameters |
| Operating Voltage | 2.7 V to 5.5 V - compatible with mixed-supply designs including 3.3 V and 5 V rails |
| Temperature Range | –40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
Packaged in 8-pin TSSOP (WI suffix), 3.00 mm × 4.40 mm footprint, 1.00 mm max height, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOW | Auxiliary voltage monitor output | Open-drain signal asserted low when VSENSE < 1.25 V; requires external pull-up |
| VCC | Primary power supply input | Supplies core logic, EEPROM, and reset circuitry; powers internal reference |
| RESET̅ | Active-low reset output / manual reset input | Drives low during brownout or watchdog timeout; accepts falling/rising edge to trigger reset |
| VSENSE | Auxiliary voltage monitor input | High-impedance node compared to 1.25 V reference; connects to resistor divider for adjustable threshold |
| VSS | Ground reference | Common return path for all internal circuits and I/O pins |
| SCL | I²C serial clock input | Master-generated clock synchronizing EEPROM read/write transfers |
| SDA | I²C bidirectional data line | Open-drain bus shared with other I²C devices; requires external pull-up |
| WDI | Watchdog timer interrupt input | Edge-sensitive input that resets watchdog timer on any transition; inactive high by default |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC (2.85–3.00 V) and external supply via VSENSE (adjustable down to 1.25 V) |
| Integrated watchdog timer | 1.6 s timeout with edge-triggered WDI input eliminates need for external timing components |
| Hardware write protection | Automatic EEPROM lock during reset or VCC < 2.85 V prevents corruption during power transients |
| 16-byte page write buffer | Reduces I²C transaction count for multi-byte updates, improving firmware efficiency and bus utilization |
| Manual reset capability | RESET̅ pin doubles as push-button input-no additional GPIO required for user-initiated reset |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors main 3.3 V logic rail and isolated 5 V analog supply in programmable logic controller modules. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, auxiliary supply fault signaling via VLOW, and nonvolatile storage of calibration coefficients. Use Value: Prevents erratic operation during rail collapse; VLOW interrupt alerts MCU to impending analog supply failure before shutdown. | Use Scenario: Ensures safe startup and runtime integrity in battery-powered infusion pumps with dual DC/DC outputs. IC Role / Device Role / Timing Role: Dual-supply monitor with watchdog guarding MCU execution, plus EEPROM storing dose history and safety limits. Use Value: Guarantees fail-safe reset at VCC = 1.0 V; 100-year data retention preserves audit logs across device lifecycle. |
| Smart Energy Meter | Automotive Body Control Module |
Use Scenario: Supervises 3.3 V microcontroller rail and 12 V–to–3.3 V converter output in revenue-grade metering hardware. IC Role / Device Role / Timing Role: Precision reset generator with VSENSE monitoring converter feedback node; stores tariff tables and firmware version. Use Value: 15 mV hysteresis prevents chatter near threshold; page write minimizes EEPROM wear during daily billing updates. | Use Scenario: Manages power sequencing and fault response in 12 V automotive ECUs with 5 V and 3.3 V domains. IC Role / Device Role / Timing Role: Brownout detector for 3.3 V domain, watchdog for CAN communication stack, EEPROM for configuration and error codes. Use Value: RESET̅ assertion at 1.0 V ensures deterministic reset even during cranking; WDI integration simplifies PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory + EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D+ | No integrated EEPROM; standalone 2.93 V supervisor with manual reset and watchdog | Requires external EEPROM for configuration storage; higher reset accuracy (±0.5%) but no memory co-location | Select when highest reset threshold precision is prioritized over integrated memory density |
| STM8T142M2U6 | ARM-based smart reset controller with 2 kB flash, 128 B RAM, and I²C; no EEPROM | Programmable logic enables custom reset sequences and diagnostics; lacks nonvolatile parameter storage | Select when firmware-defined supervision behavior (e.g., multi-stage reset, dynamic thresholds) is required |
Compared with MAX6326UT29D+ and STM8T142M2U6, CAT1027WI-28-G uniquely combines fixed-threshold supervision, watchdog, and 2 kbit EEPROM in one TSSOP-8 package-reducing BOM count and eliminating inter-chip timing dependencies inherent in discrete solutions.
Availability
CAT1027WI-28-G is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply and long-term obsolescence management.
Supply support for CAT1027WI-28-G 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The CAT1027WI-28-G belongs to ON Semiconductor's legacy supervisory IC family designed specifically for microcontroller-based systems needing integrated power monitoring, reset generation, and nonvolatile configuration storage in space-constrained industrial environments.
FAQ
What is the reset timeout duration for CAT1027WI-28-G after VCC exceeds the threshold?
The CAT1027WI-28-G asserts RESET̅ for a guaranteed minimum of 130 ms and maximum of 270 ms after VCC rises above the 2.85–3.00 V threshold, with typical timeout at 200 ms. This delay ensures stable power-up before releasing reset to the microcontroller. The timeout is internally generated and independent of external components. CAT1027WI-28-G maintains this specification across its full industrial temperature range.
Does CAT1027WI-28-G support both byte and page writes to its EEPROM?
Yes, CAT1027WI-28-G supports both byte and 16-byte page writes via its 400 kHz I²C interface. Page writes improve efficiency for sequential data updates, reducing bus transactions and total programming time. Each page write completes in 5 ms maximum. CAT1027WI-28-G enforces hardware write protection during reset or low-VCC conditions to prevent corruption. The device responds with ACK only upon successful write completion.
How does the watchdog timer in CAT1027WI-28-G respond to WDI transitions?
The CAT1027WI-28-G watchdog timer resets on any edge-rising or falling-on the WDI pin. If no transition occurs within 1.6 s ±0.5 s, RESET̅ is asserted. While RESET̅ is active, the watchdog timer remains cleared and does not count. CAT1027WI-28-G requires no external components for watchdog operation, and WDI is internally pulled high, allowing direct MCU GPIO connection without biasing resistors.
Can CAT1027WI-28-G monitor a 1.8 V auxiliary supply using VSENSE?
Yes, CAT1027WI-28-G can monitor a 1.8 V auxiliary supply using VSENSE by configuring an external resistor divider to scale the input so that 1.8 V produces ≤1.25 V at VSENSE. For example, R1 = 22 kΩ and R2 = 51 kΩ yields VSENSE = 1.25 V at VAUX = 1.8 V. CAT1027WI-28-G's high-impedance VSENSE input draws <10 µA, minimizing divider current. VLOW asserts low when scaled voltage falls below 1.25 V.
What package type does CAT1027WI-28-G use, and is it RoHS-compliant?
CAT1027WI-28-G uses an 8-pin TSSOP package (WI suffix), measuring 3.00 mm × 4.40 mm with 0.65 mm lead pitch and 1.00 mm max height, compliant with JEDEC MO-153. It is RoHS-compliant and halogen-free per ON Semiconductor's standard specifications. The "G" suffix in CAT1027WI-28-G explicitly denotes green (lead-free) packaging. No lead finish or exemption deviations apply to this orderable part.
CAT1027WI-28-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- CAT1027
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.85V, 3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
CAT1027WI-28-G FAQ
1.How can I place an order for CAT1027WI-28-G through Aetrix?
Please submit a Request for Quotation (RFQ) for CAT1027WI-28-G 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 CAT1027WI-28-G reliable?
The price and inventory of CAT1027WI-28-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CAT1027WI-28-G is usually 5 days.
3.What payment methods are accepted for CAT1027WI-28-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CAT1027WI-28-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CAT1027WI-28-G?
CAT1027WI-28-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CAT1027WI-28-G 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 CAT1027WI-28-G?
For technical support, including CAT1027WI-28-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CAT1027WI-28-G requirements.
6.How does Aetrix verify that CAT1027WI-28-G is sourced from the original manufacturer or authorized distributors?
All CAT1027WI-28-G 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 CAT1027WI-28-G meets industry standards.
7.What is the process for return or replacement of CAT1027WI-28-G?
All CAT1027WI-28-G units undergo pre-shipment inspection (PSI). If there is an issue with CAT1027WI-28-G, 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 CAT1027WI-28-G part is unused and in its original packaging.
Return procedure for CAT1027WI-28-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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