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

Microchip Technology MCP795W10-I/SL

Name: MCP795W10-I/SL
Brand: Microchip Technology
SKU: MCP795W10-I/SL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MCP795W10-I/SL

Manufacturer:: Microchip Technology

Category:: Real Time Clocks

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

Datasheet:: MCP795W10-I/SL.pdf

Description:: IC RTC CLK/CALENDAR SPI 14SOIC

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Product details

Overview

MCP795W10-I/SL from Microchip Technology is a battery-backed SPI Real-Time Clock/Calendar (RTCC) IC with integrated watchdog timer, dual event detect modules, 1 Kbit EEPROM, and 64-byte SRAM. It maintains time to hundredth-of-second resolution across -40°C to +85°C, supports ±1 ppm digital trimming, and logs power-fail/power-up timestamps. Used in industrial metering, data loggers, and backup-critical embedded systems.

For engineers reviewing the MCP795W10-I/SL datasheet, MCP795W10-I/SL pinout, MCP795W10-I/SL application, or MCP795W10-I/SL equivalent, key selection factors include its 14-pin SOIC/TSSOP package, 1.8–3.6 V operating range, 1.2 µA typical timekeeping current from VCC, and SPI interface up to 5 MHz - all validated for industrial-grade reliability and battery-backed retention.

Technical Context

The MCP795W10-I/SL implements a fully autonomous RTCC using an internal 32.768 kHz oscillator circuit optimized for 6–9 pF crystals, with on-chip digital trimming (±1 ppm resolution, ±259 ppm range) and automatic oscillator failure detection via OSCRUN flag. Its SPI interface operates at up to 5 MHz (VCC ≥ 2.5 V) and supports MSb-first transfers with CS-controlled framing.

Power management includes seamless switchover between VCC (1.8–3.6 V) and VBAT (1.3–3.6 V) at VTRIP = 1.5 V (typ), with dedicated power-fail timestamp registers (PWRDN/PWRUP) logging exact time of transition. The device integrates two independent event detectors - high-speed pulse counter and low-speed switch debouncer - each assignable to IRQ or WDO outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Time Resolution	Hundredth-of-second precision with leap-year compensation through year 2399
Operating Voltage	1.8 V to 3.6 V on VCC; 1.3 V to 3.6 V on VBAT - enables wide-input industrial power rails and long-life coin-cell backup
Timekeeping Current	1.2 µA at 3.0 V (VCC); 1.0 µA at 3.0 V (VBAT) - extends battery life beyond 10 years with CR2032
SPI Interface Speed	Up to 5 MHz (VCC ≥ 2.5 V); 3 MHz (1.8 V ≤ VCC < 2.5 V) - supports fast register access without MCU clock stretching
Digital Trimming Range	±259 ppm with ±1 ppm resolution - corrects crystal aging, temperature drift, and load capacitance mismatch
Memory Resources	64-byte battery-backed SRAM, 1 Kbit EEPROM (software write-protected), 128-bit protected EEPROM - stores configuration, calibration data, and EUI-48™ address
Alarm & Output Flexibility	Dual programmable alarms; CLKOUT selectable square-wave output (1 Hz to 32.768 kHz); IRQ and WDO pins configurable for alarm/event/WDT signals

Pinout & Package

Package: 14-lead SOIC (MCP795W10-I/SL) and TSSOP - RoHS-compliant, surface-mount, industrial-temperature rated (-40°C to +85°C).

Pin/Terminal	Circuit Role	Design Meaning
X1	Crystal input / external clock input	Accepts 32.768 kHz crystal (6–9 pF load) or external clock; also used for oscillator start/stop control via ST bit
X2	Crystal output	Drives crystal resonator; must be left floating when external clock mode is enabled (EXTOSC = 1)
VBAT	Backup supply input	Provides power to RTCC and SRAM during main supply loss; switchover occurs at 1.5 V (typ)
WDO	Watchdog timer output	Open-drain output for WDT timeout pulses or alarm events; requires external pull-up to VCC or VBAT
IRQ	Interrupt output	Open-drain output for event detect interrupts or alarm events; independently configurable from WDO
CS	Chip select input	Active-low SPI enable; initiates instruction decoding and forces SO into high-impedance when deasserted
VSS	Ground reference	Primary return path for all digital and analog circuits; must be low-impedance and decoupled near device
SO	Serial data output	Tri-state SPI output; data valid after falling edge of SCK; shares bus with other SPI peripherals when CS is high
SI	Serial data input	SPI data input; latched on rising edge of SCK; accepts instruction, address, and data bytes (MSb first)
SCK	Serial clock input	Master-generated SPI clock; rise/fall times ≤100 ns; defines timing for SI sampling and SO update
EVHS	High-speed event input	Accepts pulses up to system clock rate; triggers interrupt after programmable count; tied to VSS/VCC if unused
EVLS	Low-speed event input	Debounces mechanical switches with user-selectable period; generates IRQ on stable edge; tied to VSS/VCC if unused
CLKOUT	Clock output	Configurable square-wave output (1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, 32 Hz, 64 Hz, 128 Hz, 256 Hz, 512 Hz, 1024 Hz, 2048 Hz, 4096 Hz, 8192 Hz, 16384 Hz, or 32768 Hz)
VCC	Main power supply	Primary operating voltage source; powers all logic, memory, and interface circuits; must be applied before VBAT

Key Features

Feature	Design Value
Power-fail timestamp logging	Records exact time of VCC loss and restoration in dedicated PWRDN/PWRUP registers - enables forensic power-event analysis in unattended systems
Dual event detect modules	Independent high-speed pulse counter (EVHS) and low-speed switch debouncer (EVLS) - eliminates need for external logic or MCU GPIO polling
Configurable CLKOUT frequency	16 selectable square-wave outputs from 1 Hz to 32.768 kHz - replaces external clock dividers or dedicated oscillator ICs
Protected 128-bit EEPROM	Write-locked area requiring robust unlock sequence - securely stores EUI-48™ MAC address and critical calibration constants
Automatic oscillator failure detection	OSCRUN flag clears after >1 ms timeout (TOSF) - provides real-time health monitoring without software overhead

Applications

Smart Energy Metering	Industrial Data Logger
Use Scenario: Utility-grade electricity meters requiring tamper-proof time-stamped consumption records and firmware update validation. IC Role / Device Role / Timing Role: Primary timekeeping engine with power-fail timestamping, secure EUI-48™ storage, and alarm-triggered event logging. Use Value: Maintains traceable, battery-backed time across brownouts; 1.2 µA VCC current enables >15-year CR2032 operation; protected EEPROM prevents unauthorized MAC reprogramming.	Use Scenario: Remote environmental sensors logging temperature, humidity, and vibration with precise UTC-aligned timestamps. IC Role / Device Role / Timing Role: Autonomous RTCC providing synchronized timestamps for sensor readings and wake-up scheduling for ultra-low-power sleep cycles. Use Value: Hundredth-of-second resolution ensures sub-second correlation across distributed nodes; dual event inputs capture external triggers (e.g., door open, motion) without MCU intervention.
Medical Diagnostic Equipment	POS Terminal with Audit Trail
Use Scenario: Portable ultrasound or ECG devices needing FDA-compliant audit trails, calibration timestamps, and battery-backed runtime clocks. IC Role / Device Role / Timing Role: Certified time source with power-loss recovery, SRAM retention, and write-protected calibration storage. Use Value: Power-fail timestamping satisfies IEC 62304 traceability requirements; 64-byte SRAM preserves last-session state during battery swaps; ±1 ppm trimming meets clinical timing accuracy standards.	Use Scenario: Payment terminals requiring PCI-DSS-compliant transaction logging, secure serial number storage, and tamper-evident time stamps. IC Role / Device Role / Timing Role: Secure RTC with EUI-48™ MAC, protected EEPROM, and dual alarms for end-of-day reporting and maintenance alerts. Use Value: 128-bit protected EEPROM stores immutable device ID and firmware version; alarm outputs trigger automated log dumps; CLKOUT drives secure crypto module clocks.

Smart Energy Metering

Industrial Data Logger

Use Scenario: Utility-grade electricity meters requiring tamper-proof time-stamped consumption records and firmware update validation.

IC Role / Device Role / Timing Role: Primary timekeeping engine with power-fail timestamping, secure EUI-48™ storage, and alarm-triggered event logging.

Use Value: Maintains traceable, battery-backed time across brownouts; 1.2 µA VCC current enables >15-year CR2032 operation; protected EEPROM prevents unauthorized MAC reprogramming.

Use Scenario: Remote environmental sensors logging temperature, humidity, and vibration with precise UTC-aligned timestamps.

IC Role / Device Role / Timing Role: Autonomous RTCC providing synchronized timestamps for sensor readings and wake-up scheduling for ultra-low-power sleep cycles.

Use Value: Hundredth-of-second resolution ensures sub-second correlation across distributed nodes; dual event inputs capture external triggers (e.g., door open, motion) without MCU intervention.

Medical Diagnostic Equipment

POS Terminal with Audit Trail

Use Scenario: Portable ultrasound or ECG devices needing FDA-compliant audit trails, calibration timestamps, and battery-backed runtime clocks.

IC Role / Device Role / Timing Role: Certified time source with power-loss recovery, SRAM retention, and write-protected calibration storage.

Use Value: Power-fail timestamping satisfies IEC 62304 traceability requirements; 64-byte SRAM preserves last-session state during battery swaps; ±1 ppm trimming meets clinical timing accuracy standards.

Use Scenario: Payment terminals requiring PCI-DSS-compliant transaction logging, secure serial number storage, and tamper-evident time stamps.

IC Role / Device Role / Timing Role: Secure RTC with EUI-48™ MAC, protected EEPROM, and dual alarms for end-of-day reporting and maintenance alerts.

Use Value: 128-bit protected EEPROM stores immutable device ID and firmware version; alarm outputs trigger automated log dumps; CLKOUT drives secure crypto module clocks.

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
MCP795W11-I/SL	Same package and pinout; preprogrammed with factory-assigned EUI-48™ MAC address in protected EEPROM	Required where IEEE-compliant unique node identification is mandated (e.g., networked medical devices, IoT gateways)	Select MCP795W11-I/SL when EUI-48™ is needed out-of-box; otherwise MCP795W10-I/SL offers identical RTCC functionality at lower cost
DS3231M+	Higher accuracy (±2 ppm over -40°C to +85°C); integrated TCXO; no event detect or watchdog; I²C-only interface	Better suited for precision instrumentation where timing stability outweighs feature count and SPI compatibility	Choose DS3231M+ only when absolute time accuracy is primary requirement and SPI interface or event detection is unnecessary

Compared with MCP795W11-I/SL, the MCP795W10-I/SL omits factory-programmed EUI-48™ but retains full RTCC, EEPROM, and event features - making it optimal for cost-sensitive, non-networked applications. Versus DS3231M+, it trades TCXO-level accuracy for richer peripheral integration and SPI compatibility, better serving resource-constrained microcontroller systems.

Availability

MCP795W10-I/SL is available at Aetrix Electronics and suitable for industrial metering, medical diagnostics, POS terminal design, and remote data logging requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MCP795W10-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 manufacturing and support infrastructure.

The MCP795WXX product line delivers highly integrated, battery-backed SPI RTCs with enhanced system supervision features - designed specifically for industrial, medical, and metering applications demanding reliable timekeeping, event detection, and secure nonvolatile storage under variable power conditions.

FAQ

What is the primary function of the MCP795W10-I/SL?

The MCP795W10-I/SL is a battery-backed SPI Real-Time Clock/Calendar IC that maintains accurate time and date (including hundredth-of-second resolution and leap-year compensation through 2399), logs power-fail/power-up events, and provides integrated watchdog, event detection, and memory resources. Its core function is autonomous, low-power timekeeping with system supervision capabilities - essential for applications where time integrity must persist across power interruptions. The MCP795W10-I/SL achieves this while consuming only 1.2 µA from VCC at 3.0 V.

Does the MCP795W10-I/SL support external crystal oscillators?

Yes, the MCP795W10-I/SL supports external 32.768 kHz tuning fork crystals with load capacitances of 6–9 pF via X1 and X2 pins. Its on-chip oscillator circuit is optimized for this range, and digital trimming (±1 ppm resolution) compensates for crystal tolerance and temperature drift. The OSCRUN flag in RTCWKDAY register confirms oscillator health. External clock input (32.768 kHz) is also supported by driving X1 directly and leaving X2 floating - configured via the EXTOSC bit in the CONTROL register.

How does the MCP795W10-I/SL handle power transitions between VCC and VBAT?

The MCP795W10-I/SL automatically switches to VBAT backup supply when VCC falls below VTRIP (1.3–1.7 V, typ 1.5 V), maintaining RTCC operation and SRAM contents without interruption. It logs exact timestamps of both power-fail and power-up events in dedicated PWRDN and PWRUP registers. VBAT must be applied after VCC, and the device draws only 1.0 µA (typ) from VBAT at 3.0 V - enabling multi-year operation on standard coin cells. The VBATEN flag in RTCWKDAY indicates active backup mode.

What memory resources are included in the MCP795W10-I/SL?

The MCP795W10-I/SL integrates 64 bytes of battery-backed SRAM (addresses 0x20–0x5F), 1 Kbit (128-byte) software write-protected EEPROM (accessed via EEREAD/EEWRITE), and 128 bits (16-byte) of protected EEPROM (accessed via IDREAD/IDWRITE). The protected EEPROM requires a robust unlock sequence and stores critical data such as EUI-48™ MAC addresses (though MCP795W10-I/SL ships with blank protected EEPROM - unlike MCP795W11-I/SL). All memory remains accessible and retained during VCC-to-VBAT switchover.

Can the MCP795W10-I/SL generate configurable clock outputs?

Yes, the MCP795W10-I/SL provides a programmable CLKOUT pin capable of generating 16 different square-wave frequencies: 1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, 32 Hz, 64 Hz, 128 Hz, 256 Hz, 512 Hz, 1024 Hz, 2048 Hz, 4096 Hz, 8192 Hz, 16384 Hz, or 32768 Hz. This is controlled via SQWFS[1:0] and SQWEN bits in the CONTROL register. The output is disabled by default and requires explicit enablement - eliminating unintended clock loading on the board. CLKOUT operates independently of alarm or watchdog functions.

MCP795W10-I/SL Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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

Packaging:: Tube

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

MCP795W10-I/SL FAQ

1.How can I place an order for MCP795W10-I/SL through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP795W10-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 MCP795W10-I/SL reliable?

The price and inventory of MCP795W10-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 MCP795W10-I/SL is usually 5 days.

3.What payment methods are accepted for MCP795W10-I/SL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP795W10-I/SL transactions.

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4.How is shipping managed for MCP795W10-I/SL?

MCP795W10-I/SL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP795W10-I/SL 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 MCP795W10-I/SL?

For technical support, including MCP795W10-I/SL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP795W10-I/SL requirements.

6.How does Aetrix verify that MCP795W10-I/SL is sourced from the original manufacturer or authorized distributors?

All MCP795W10-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 MCP795W10-I/SL meets industry standards.

7.What is the process for return or replacement of MCP795W10-I/SL?

All MCP795W10-I/SL units undergo pre-shipment inspection (PSI). If there is an issue with MCP795W10-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 MCP795W10-I/SL part is unused and in its original packaging.

Return procedure for MCP795W10-I/SL:

1.Submit a request within 90 days.

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

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