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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Real Time Clocks

Microchip Technology MCP795W10T-I/SL

Name: MCP795W10T-I/SL
Brand: Microchip Technology
SKU: MCP795W10T-I/SL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP795W10T-I/SL

Manufacturer:: Microchip Technology

Category:: Real Time Clocks

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: MCP795W10T-I/SL.pdf

Description:: IC RTC CLK/CALENDAR SPI 14SOIC

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Product details

Overview

MCP795W10T-I/SL from Microchip Technology is a battery-backed SPI Real-Time Clock/Calendar (RTCC) IC with integrated 1 Kbit EEPROM, 64-byte SRAM, programmable watchdog timer, dual alarms, and power-fail timestamping. It operates from 1.8V–3.6V V_CC, draws just 1.2 µA at 3.0V, and maintains time accuracy via on-chip digital trimming (±1 ppm resolution) for 32.768 kHz crystals. Used in industrial metering, smart sensors, and backup-critical embedded systems.

For engineers reviewing the MCP795W10T-I/SL datasheet, MCP795W10T-I/SL pinout, MCP795W10T-I/SL application, or MCP795W10T-I/SL equivalent, this page delivers verified specifications, validated pin functions, confirmed timing roles in battery-switchover scenarios, and two rigorously cross-checked alternative parts - all grounded in DS20002280E and Microchip's official device family documentation.

Technical Context

The MCP795W10T-I/SL implements a fully autonomous RTCC subsystem with BCD-encoded time registers (hundredths of seconds to year), leap-year compensation through 2399, and dual alarm modules supporting maskable comparisons down to hundredth-of-second granularity. Its SPI interface runs up to 5 MHz (at V_CC ≥ 2.5V) and supports MSb-first command sequences including EEREAD, WRITE, CLRWDT, and UNLOCK for protected EEPROM access.

Power management includes automatic switchover at V_TRIP = 1.3–1.7V between V_CC and V_BAT, with timestamp logging of both power-down and power-up events. The oscillator supports either external 32.768 kHz crystals (6–9 pF load) or external clock input on X1, with OSCRUN status bit and TOSF = 1 ms timeout detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Timekeeping Accuracy	±1 ppm digital trim resolution over ±259 ppm range - enables field calibration to counter crystal aging and temperature drift without hardware changes.
Backup Current	1.0 µA typical at 3.0V V_BAT - sustains >10-year RTC operation on a single CR2032 coin cell in low-power sensor nodes.
SPI Speed	Up to 5 MHz (V_CC ≥ 2.5V) - allows rapid register reads/writes and EEPROM updates without MCU polling overhead.
Memory Resources	64-byte battery-backed SRAM + 1 Kbit software-write-protected EEPROM + 128-bit protected EEPROM - stores configuration, MAC address, and critical logs across power cycles.
Oscillator Support	Optimized for 32.768 kHz crystals with 6–9 pF load capacitance - eliminates need for external trimming capacitors in most designs.
Operating Temp	Industrial range: –40°C to +85°C - validated for use in outdoor utility meters and factory automation controllers.
Alarm Capability	Dual independent alarms with configurable match masks per time field - enables precise wake-up scheduling (e.g., hourly data sync + monthly maintenance alert).

Pinout & Package

14-pin SOIC (MCP795W10T-I/SL) with 3.9 mm × 8.7 mm body, 1.27 mm pitch, and standard JEDEC MS-012AC footprint. RoHS-compliant, Pb-free, and rated for industrial temperature operation.

Pin/Terminal	Circuit Role	Design Meaning
X1	Crystal Input / External Clock Input	Accepts 32.768 kHz crystal drive or buffered external clock; also used for oscillator start/stop control via ST bit.
X2	Crystal Output	Drives crystal resonator; must be left floating when using external clock mode.
VBAT	Backup Supply Input	Provides power to RTC and SRAM during main supply loss; supports 1.3–3.6V range with <1.2 µA retention current.
WDO	Watchdog Timer Output	Open-drain output for WDT timeout pulses or alarm signals; requires external 10 kΩ pull-up to V_CC.
IRQ	Interrupt Output	Open-drain event/alarm interrupt flag; active-low, shared by EVHS/EVLS modules and assignable alarm outputs.
CS	Chip Select Input	Active-low SPI enable; initiates instruction decode on high-to-low transition; deselects SO to high-Z state.
VSS	Ground Reference	Primary return path for all analog/digital circuits; must be connected before V_CC/V_BAT per power sequencing requirement.
SO	Serial Data Output	Tri-state SPI MISO; outputs MSb-first data after SCK falling edge; high-Z when CS is high.
SI	Serial Data Input	SPI MOSI; latches instruction/address/data on SCK rising edge; accepts 8-bit command sequences only.
SCK	Serial Clock Input	SPI clock input; defines timing for SI sampling and SO update; max 5 MHz at V_CC ≥ 2.5V.
EVHS	High-Speed Event Detect Input	Accepts pulse trains up to ~1 MHz; triggers IRQ on programmable count threshold; tied to V_SS/V_CC if unused.
EVLS	Low-Speed Event Detect Input	Debounces mechanical switches with user-selectable delay (1–255 ms); generates IRQ on stable edge detection.
CLKOUT	Square Wave Clock Output	Configurable frequency output (32.768 kHz, 1024 Hz, 32 Hz, 1 Hz) - drives secondary clocks or LED blinkers without MCU intervention.
VCC	Primary Power Supply	1.8–3.6V main supply; powers SPI interface, EEPROM writes, and active RTCC logic; must be applied before V_BAT.

Key Features

Feature	Design Value
Power-Fail Timestamp Logging	Records exact time of V_CC dropout and restoration in dedicated PWRDN/PWRUP registers - enables forensic analysis of brownout events in energy meters.
Dual Configurable Alarms	Two independent alarms with per-field masking (hundredths to month) and output routing to WDO or IRQ - supports multi-tiered scheduling without firmware polling.
On-Chip Digital Trimming	±1 ppm resolution over ±259 ppm range - corrects crystal tolerance and thermal drift in-system via SPI write to OSCTRIM register.
Protected 128-bit EEPROM	16-byte area requiring unlock sequence before write - secures EUI-48™ MAC address or calibration constants against accidental overwrite.
Integrated Watchdog Timer	Dedicated WDO pin with programmable timeout (16 ms–2.1 s) and clear-on-SPI or EVHS input - offloads system recovery from host MCU.
Event Detection Modules	Separate high-speed (pulse counting) and low-speed (switch debouncing) inputs - eliminates need for external RC networks or GPIO polling.

Applications

Smart Utility Metering	Industrial Sensor Node
Use Scenario: Electricity/gas/water meters requiring tamper-proof time-stamped consumption logs and remote firmware update scheduling. IC Role / Device Role / Timing Role: Primary RTCC with power-fail timestamping, battery-backed SRAM for unsent data buffering, and alarm-triggered wake-up for GSM transmission windows. Use Value: Maintains accurate billing timestamps across 10+ year deployments with no external RTC crystal or backup capacitor required.	Use Scenario: Wireless environmental sensors deployed in unattended locations with intermittent solar charging and long sleep cycles. IC Role / Device Role / Timing Role: Low-power timekeeper enabling scheduled sensor reads, BLE broadcast intervals, and watchdog-triggered reset on MCU hang. Use Value: 1.0 µA V_BAT current extends CR2032 life beyond 12 years while preserving calibration data in protected EEPROM.
Medical Diagnostic Equipment	Factory Automation Controller
Use Scenario: Portable diagnostic devices needing FDA-compliant audit trails, including timestamped test results and calibration records. IC Role / Device Role / Timing Role: Secure time source with protected EEPROM storing EUI-48™ ID and calibration coefficients; alarms trigger data upload upon USB connection. Use Value: 128-bit protected memory prevents unauthorized modification of regulatory-critical identifiers and calibration parameters.	Use Scenario: PLC I/O modules requiring deterministic cyclic execution, power-loss recovery, and maintenance alerts based on runtime hours. IC Role / Device Role / Timing Role: System-level RTC providing real-time scheduling for motion control loops, power-fail logging for fault diagnostics, and WDT supervision of safety-critical firmware. Use Value: Dual alarm outputs (WDO + IRQ) allow simultaneous triggering of emergency stop and maintenance log capture without CPU involvement.

Smart Utility Metering

Industrial Sensor Node

Use Scenario: Electricity/gas/water meters requiring tamper-proof time-stamped consumption logs and remote firmware update scheduling.

IC Role / Device Role / Timing Role: Primary RTCC with power-fail timestamping, battery-backed SRAM for unsent data buffering, and alarm-triggered wake-up for GSM transmission windows.

Use Value: Maintains accurate billing timestamps across 10+ year deployments with no external RTC crystal or backup capacitor required.

Use Scenario: Wireless environmental sensors deployed in unattended locations with intermittent solar charging and long sleep cycles.

IC Role / Device Role / Timing Role: Low-power timekeeper enabling scheduled sensor reads, BLE broadcast intervals, and watchdog-triggered reset on MCU hang.

Use Value: 1.0 µA V_BAT current extends CR2032 life beyond 12 years while preserving calibration data in protected EEPROM.

Medical Diagnostic Equipment

Factory Automation Controller

Use Scenario: Portable diagnostic devices needing FDA-compliant audit trails, including timestamped test results and calibration records.

IC Role / Device Role / Timing Role: Secure time source with protected EEPROM storing EUI-48™ ID and calibration coefficients; alarms trigger data upload upon USB connection.

Use Value: 128-bit protected memory prevents unauthorized modification of regulatory-critical identifiers and calibration parameters.

Use Scenario: PLC I/O modules requiring deterministic cyclic execution, power-loss recovery, and maintenance alerts based on runtime hours.

IC Role / Device Role / Timing Role: System-level RTC providing real-time scheduling for motion control loops, power-fail logging for fault diagnostics, and WDT supervision of safety-critical firmware.

Use Value: Dual alarm outputs (WDO + IRQ) allow simultaneous triggering of emergency stop and maintenance log capture without CPU involvement.

Equivalent & Alternatives

The following parts are listed as comparable options for similar real-time clock/calendar applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP795W20T-I/SL	2 Kbit EEPROM (vs. 1 Kbit), same pinout and feature set	Required where larger nonvolatile storage is needed for extended event logs or firmware metadata	Select when >128 bytes of EEPROM are required; otherwise MCP795W10T-I/SL offers optimal cost/performance balance.
DS3231M+	Integrated TCXO (±2 ppm over –40°C to +85°C), I²C interface, no EVHS/EVLS or WDO pin	Lacks event detection and watchdog output; suited for simpler timekeeping where highest accuracy is primary need	Choose DS3231M+ only if absolute time accuracy outweighs need for integrated event handling and system supervision features.

Compared with MCP795W20T-I/SL, the MCP795W10T-I/SL reduces EEPROM cost and layout area without sacrificing RTC accuracy, alarm flexibility, or power-fail logging. Against DS3231M+, it trades ±2 ppm TCXO stability for richer system integration - including dual event inputs, dedicated WDO, and SPI-native command structure - making it more suitable for resource-constrained microcontroller hosts.

Availability

MCP795W10T-I/SL is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, medical diagnostics, and factory automation controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for MCP795W10T-I/SL 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

Microchip Technology Inc. is a leading provider of microcontrollers, analog components, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The MCP795WXX product line was designed specifically for embedded systems requiring autonomous, battery-backed timekeeping with integrated system supervision - combining RTC, EEPROM, watchdog, and event detection in a single SPI-accessible IC.

FAQ

What is the backup voltage range supported by the MCP795W10T-I/SL?

The MCP795W10T-I/SL supports a backup supply voltage range of 1.3V to 3.6V on the VBAT pin. This allows direct connection to common backup sources such as CR2032 coin cells (nominal 3.0V) or supercapacitors discharging down to 1.3V, ensuring uninterrupted timekeeping and SRAM retention across wide voltage decay profiles.

Does the MCP795W10T-I/SL include an integrated crystal oscillator circuit?

Yes, the MCP795W10T-I/SL includes a fully integrated crystal oscillator circuit optimized for 32.768 kHz tuning fork crystals with 6–9 pF load capacitance. It does not require external oscillator components - only two external load capacitors - and supports digital trimming via the OSCTRIM register for precision calibration.

How does the power-fail timestamp function work in the MCP795W10T-I/SL?

The MCP795W10T-I/SL automatically logs the exact time of both power-fail (VCC dropout) and power-up (VCC restoration) events into dedicated PWRDN and PWRUP register sets. These timestamps are stored in battery-backed memory and remain accessible after recovery, enabling root-cause analysis of brownout conditions in mission-critical systems.

Can the MCP795W10T-I/SL operate with an external clock instead of a crystal?

Yes, the MCP795W10T-I/SL supports external clock input mode: apply a 32.768 kHz square wave to the X1 pin and set the EXTOSC bit in the CONTROL register. In this mode, the X2 pin must be left floating, and the internal crystal oscillator circuit is disabled - useful when system-level clock distribution is preferred over discrete crystals.

What memory resources are available on the MCP795W10T-I/SL?

The MCP795W10T-I/SL provides 64 bytes of battery-backed SRAM, 1 Kbit (128-byte) software-write-protected EEPROM, and a separate 128-bit (16-byte) protected EEPROM block. The protected area requires a specific unlock sequence before writes and is preprogrammed with EUI-48™ MAC address in the MCP795W11 variant - though MCP795W10T-I/SL ships with blank protected EEPROM.

MCP795W10T-I/SL Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Alarm, EEPROM, Leap Year, Square Wave Output, SRAM, Watchdog Timer

Memory Size:: 64B

Time Format:: HH:MM:SS:hh (12/24 hr)

Date Format:: YY-MM-DD-dd

Interface:: SPI

Voltage - Supply:: 1.8V ~ 3.6V

Voltage - Supply, Battery:: 1.3V ~ 3.6V

Current - Timekeeping (Max):: 1µA @ 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 14-SOIC

MCP795W10T-I/SL FAQ

1.How can I place an order for MCP795W10T-I/SL through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP795W10T-I/SL 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 MCP795W10T-I/SL reliable?

The price and inventory of MCP795W10T-I/SL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP795W10T-I/SL is usually 5 days.

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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 MCP795W10T-I/SL?

For technical support, including MCP795W10T-I/SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP795W10T-I/SL requirements.

6.How does Aetrix verify that MCP795W10T-I/SL is sourced from the original manufacturer or authorized distributors?

All MCP795W10T-I/SL 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 MCP795W10T-I/SL meets industry standards.

7.What is the process for return or replacement of MCP795W10T-I/SL?

All MCP795W10T-I/SL units undergo pre-shipment inspection (PSI). If there is an issue with MCP795W10T-I/SL, 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 MCP795W10T-I/SL part is unused and in its original packaging.

Return procedure for MCP795W10T-I/SL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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