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Microchip Technology MCP79410T-I/MS
- Part No.:
- MCP79410T-I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Real Time Clocks
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP79410T-I/MS.pdf
- Description:
- IC RTC CLK/CALENDAR I2C 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:12,200
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Product details
Overview
MCP79410T-I/MS from Microchip Technology is a battery-backed I²C Real-Time Clock/Calendar (RTCC) IC with integrated 64-byte SRAM, 1 Kbit EEPROM, and digital trimming. It maintains time across hours/minutes/seconds/day/month/year with leap-year compensation to 2399, operates from 1.8V–5.5V, draws just 1.2 µA at 3.3V, and supports dual alarms and power-fail timestamping. Used in industrial control panels requiring accurate, low-power timekeeping with nonvolatile memory.
For engineers reviewing the MCP79410T-I/MS datasheet, MCP79410T-I/MS pinout, MCP79410T-I/MS application, or MCP79410T-I/MS equivalent, this page delivers verified specifications, validated pin functions, confirmed I²C timing compliance up to 400 kHz, exact package mapping to 8-pin MSOP, and two rigorously cross-referenced alternative parts for design flexibility.
Technical Context
The MCP79410T-I/MS implements a fully autonomous RTCC using an internal 32.768 kHz oscillator circuit optimized for 6–9 pF crystals, with ±1 ppm digital trimming resolution over ±129 ppm range. Its I²C interface complies with standard mode (100 kHz) and fast mode (400 kHz) timing, supporting slave address 0x6F (RTCC/SRAM) and 0x57 (EEPROM).
Power management includes automatic switchover between VCC and VBAT (1.3–5.5V), logging of power-fail and power-up timestamps, and retention of SRAM and RTC registers during backup operation. The open-drain MFP supports alarm assertion, selectable square-wave output (32.768 kHz, 1024 Hz, 32 Hz, 1 Hz), or general-purpose output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Timekeeping Accuracy | ±1 ppm trimming resolution enables fine calibration against crystal tolerance and temperature drift |
| I²C Clock Rate | Up to 400 kHz - supports high-speed host MCU communication without bus contention |
| Operating Voltage | 1.8V–5.5V - compatible with modern low-voltage microcontrollers and legacy 5V systems |
| Backup Current | 925 nA at 3.0V VBAT - extends coin-cell life beyond 10 years in typical industrial applications |
| Memory Resources | 64-byte battery-backed SRAM + 1 Kbit EEPROM + 8-byte protected EEPROM - stores configuration, logs, and EUI-48/EUI-64 (not preprogrammed in MCP79410) |
| Alarm Capability | Dual programmable alarms with maskable fields down to seconds - enables precise event scheduling without CPU polling |
| Power-Fail Timestamp | Logs exact time of VCC loss and restoration - critical for forensic diagnostics in unattended equipment |
Pinout & Package
Package: 8-pin MSOP (3.0 mm × 4.9 mm, 0.65 mm pitch), RoHS-compliant, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X1 | Crystal input / external clock input | Accepts 32.768 kHz crystal or CMOS clock; enables oscillator start via ST bit in RTCSEC register |
| X2 | Crystal output | Drives crystal resonator; must be left floating when external clock is used on X1 |
| VBAT | Backup supply input | Provides power to RTC and SRAM during main supply failure; switchover threshold 1.3–1.7 V |
| VSS | Ground reference | Common return path for all analog/digital circuits; exposed pad on TDFN variant connects to VSS |
| SDA | I²C bidirectional data line | Open-drain, requires external pull-up; supports 100/400 kHz modes; ACK generated after each byte |
| SCL | I²C clock input | Master-generated clock; rise/fall times constrained to ≤300 ns above 2.5V for 400 kHz compliance |
| MFP | Multi-function open-drain output | Configurable as alarm pulse, square-wave generator (4 frequencies), or GPIO; requires pull-up resistor |
| VCC | Main power supply | Primary operating voltage source; powers EEPROM writes, I²C interface, and trimming logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent alarms | Each alarm masks time/date fields individually (e.g., ALM0 triggers only on HH:MM match, ALM1 on DD/MM/YYYY) |
| On-chip digital trimming | Adjusts oscillator frequency in ±1 ppm steps across ±129 ppm range - eliminates need for external trim caps |
| Power-fail timestamp capture | Automatically records exact time of VCC dropout and recovery in dedicated PWRDN/PWRUP registers |
| Protected 8-byte EEPROM | Write-protected region requiring unlock sequence - suitable for storing secure identifiers or calibration constants |
| Low-power oscillator architecture | 1.2 µA timekeeping current at 3.3V VCC enables >5-year operation from CR2032 in always-on designs |
Applications
| Industrial Control Panel | Smart Energy Meter |
|---|---|
Use Scenario: Time-stamping of process events, maintenance logs, and firmware update records in factory HMIs. IC Role / Device Role / Timing Role: Primary RTCC providing UTC-synchronized timestamps with battery backup during AC mains interruption. Use Value: Ensures audit-trail integrity across power cycles; 925 nA VBAT current enables >12-year coin-cell lifetime. | Use Scenario: Recording energy consumption intervals, tariff switching times, and outage durations in residential meters. IC Role / Device Role / Timing Role: High-accuracy timebase for billing-grade interval data; power-fail timestamp captures grid disconnection/reconnection. Use Value: Meets IEC 62053-21 Class 0.5S timing accuracy requirements; dual alarms trigger tariff changes without MCU intervention. |
| Medical Infusion Pump | Building Automation Controller |
Use Scenario: Logging drug delivery start/stop times, dose history, and calibration events in battery-powered portable pumps. IC Role / Device Role / Timing Role: Tamper-resistant timekeeper with protected EEPROM storing device serial number and calibration coefficients. Use Value: 8-byte protected EEPROM prevents unauthorized modification; 1.2 µA VCC current minimizes primary battery drain. | Use Scenario: Scheduling HVAC setpoints, lighting scenes, and security system arming based on real-time calendar and weekday. IC Role / Device Role / Timing Role: Calendar-aware scheduler with leap-year compensation and dual alarms for daily/weekly recurring tasks. Use Value: Eliminates annual manual date correction; 24-hour format support simplifies integration with BACnet/IP time objects. |
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 |
|---|---|---|---|
| DS3231M+ | Integrated TCXO (±2 ppm over -40°C to +85°C); higher accuracy but no EEPROM or protected memory | Lacks 1 Kbit EEPROM and 8-byte protected area - unsuitable where secure ID storage or configuration persistence is required | Select DS3231M+ only when absolute time accuracy outweighs memory and security features |
| PCF8563T | No digital trimming; fixed 32.768 kHz oscillator; 236-byte RAM but no EEPROM; lower VCC min (1.0V) | Missing power-fail timestamp, alarm masking granularity, and protected memory - limited for forensic logging or secure boot | Choose PCF8563T for ultra-low-cost, basic RTC needs where memory and timestamping are not critical |
Compared with DS3231M+ and PCF8563T, the MCP79410T-I/MS uniquely combines calibrated timekeeping, dual alarms with field-level masking, battery-backed SRAM + EEPROM + protected memory, and power-fail timestamping - making it optimal for industrial and medical devices requiring both precision and data integrity.
Availability
MCP79410T-I/MS is available at Aetrix Electronics and suitable for industrial control panels, smart energy meters, medical infusion pumps, and building automation controllers requiring stable component supply across extended product lifecycles.
Supply support for MCP79410T-I/MS 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The MCP7941X family was designed specifically for embedded systems needing robust, low-power timekeeping with integrated nonvolatile memory and tamper-resistant timestamping - targeting industrial, medical, and utility metering applications.
FAQ
What is the primary function of the MCP79410T-I/MS?
The MCP79410T-I/MS is a battery-backed I²C Real-Time Clock/Calendar IC that maintains accurate time and date (hours, minutes, seconds, day, month, year, weekday) with leap-year compensation to 2399. It integrates 64-byte SRAM, 1 Kbit EEPROM, digital trimming, dual alarms, and power-fail timestamping - all in an 8-pin MSOP package. The MCP79410T-I/MS serves as the trusted time source in systems where data integrity and long-term reliability are critical.
Does the MCP79410T-I/MS support external crystal load capacitors?
Yes, the MCP79410T-I/MS is optimized for 32.768 kHz crystals with 6–9 pF load capacitance and requires external load capacitors (CX1, CX2) placed close to X1/X2 pins. The effective load capacitance CL includes CX1, CX2, pin capacitance (~3 pF), and PCB stray capacitance. The MCP79410T-I/MS does not include internal load caps - external components are mandatory for stable oscillation. Layout guidelines recommend grounded copper pour isolation around the crystal circuit.
How does the MCP79410T-I/MS handle power transitions between VCC and VBAT?
The MCP79410T-I/MS automatically switches to VBAT (1.3–5.5V) when VCC drops below the 1.3–1.7V switchover threshold (VTRIP), preserving RTC registers and 64-byte SRAM contents. It logs the exact time of power loss in PWRDN registers and power restoration in PWRUP registers. During VBAT-only operation, I²C is disabled, but timekeeping continues at 925 nA typical current at 3.0V - ensuring uninterrupted timekeeping across brownouts and main power failures.
What memory resources are available on the MCP79410T-I/MS?
The MCP79410T-I/MS provides three memory types: (1) 64-byte battery-backed SRAM (addresses 0x20–0x5F), retained during VBAT operation; (2) 1 Kbit (128-byte) EEPROM (0x00–0x7F) with software write-protection and 1M endurance; and (3) 8-byte protected EEPROM (0xF0–0xF7) accessible only after a specific unlock sequence - ideal for MAC addresses or calibration keys. Unlike MCP79411/MCP79412, the MCP79410T-I/MS ships unprogrammed in the protected area.
Can the MCP79410T-I/MS generate a square-wave output?
Yes, the MCP79410T-I/MS can configure its open-drain MFP pin to output a square wave at four selectable frequencies: 32.768 kHz, 1024 Hz, 32 Hz, or 1 Hz. This is enabled by setting SQWEN = 1 and selecting SQWFS[1:0] in the CONTROL register (0x07). The output requires an external pull-up resistor (typically 10 kΩ) to VCC. The same pin also supports alarm assertion and general-purpose output - selected via the OUT bit in CONTROL.
MCP79410T-I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
- Memory Size:
- 64B, 1Kb
- Time Format:
- HH:MM:SS (12/24 hr)
- Date Format:
- YY-MM-DD-dd
- Interface:
- I2C, 2-Wire Serial
- Voltage - Supply:
- 1.8V ~ 5.5V
- Voltage - Supply, Battery:
- 1.3V ~ 5.5V
- Current - Timekeeping (Max):
- 1.2µA @ 3.3V
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-MSOP
MCP79410T-I/MS FAQ
1.How can I place an order for MCP79410T-I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP79410T-I/MS 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 MCP79410T-I/MS reliable?
The price and inventory of MCP79410T-I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP79410T-I/MS is usually 5 days.
3.What payment methods are accepted for MCP79410T-I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP79410T-I/MS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP79410T-I/MS?
MCP79410T-I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP79410T-I/MS 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 MCP79410T-I/MS?
For technical support, including MCP79410T-I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP79410T-I/MS requirements.
6.How does Aetrix verify that MCP79410T-I/MS is sourced from the original manufacturer or authorized distributors?
All MCP79410T-I/MS 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 MCP79410T-I/MS meets industry standards.
7.What is the process for return or replacement of MCP79410T-I/MS?
All MCP79410T-I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP79410T-I/MS, 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 MCP79410T-I/MS part is unused and in its original packaging.
Return procedure for MCP79410T-I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCP79410T-I/MS Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP Semiconductors
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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