MCP79410-I/MS - I2C RTC with EEPROM and Battery Backup | Microchip
Teilenummer: MCP79410-I/MS ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.1006 | $1,10 |
| 10 | $1.05 | $10,50 |
| 100 | $0.9 | $90,00 |
| 500 | $0.78 | $390,00 |
| 1.000 | $0.68 | $680,00 |
MCP79410-I/MS Übersicht
A real-time clock, or RTC, is a low-power timing integrated circuit that maintains wall-clock time independently of the system processor. An RTCC extends the basic RTC function with calendar registers for seconds, minutes, hours, dates, months, and years. The MCP79410 belongs to the RTC, RTCC, clock/calendar, and timekeeping IC hierarchy and interfaces to a host through a two-wire I2C-compatible serial interface.
The MCP79410 provides 1 Kbit of EEPROM for persistent configuration or event records and 64 bytes of SRAM for temporary data. Its battery-switchover circuit allows the clock and memory to remain operational from a backup source when the primary supply fails. A timestamp mechanism records the power-failure event, while digital timing compensation compensates for crystal error and improves timekeeping accuracy without relying only on fixed analog calibration.
According to the manufacturer datasheet, the clock supports automatic month-length handling, leap-year correction, 24-hour or 12-hour formats, programmable alarms, and a configurable CLKOUT. The MCP79410 family also includes a power-sense function that supports automatic transition between the primary supply and backup battery. The -I/MS ordering suffix denotes the specified package and temperature treatment, while /MS identifies the MSOP package used by this MPN.
Typical uses include industrial controllers, embedded instruments, data loggers, meters, medical equipment, communication modules, and consumer electronics requiring accurate time stamps. Compared with software timekeeping based on a microcontroller timer, the RTC maintains a dedicated time base across resets, sleep states, and main-power interruptions. Its I2C interface also allows firmware to read and write time and memory data efficiently.
The most important design checks are the 32.768 kHz crystal network, I2C pull-up resistors, decoupling capacitors, backup-battery configuration, and VBATEN handling. Firmware must configure the relevant control registers and verify the device address before normal operation. Because clock accuracy depends on the crystal and its load network, PCB placement and grounding should follow the manufacturer's recommended layout guidance.
This product page combines verified distributor information, manufacturer technical facts, application guidance, and design considerations. It is intended to help engineers evaluate the MCP79410-I/MS for compact, battery-backed real-time clock and calendar designs, including comparisons, procurement questions, firmware considerations, and practical integration advice.
Drop-in-Alternativen für MCP79410-I/MS – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
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MCP79410-I/MS Technische Daten
| Product Type | I2C-compatible real-time clock/calendar with EEPROM and SRAM |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Betriebstemperaturbereich | -40°C to +85°C |
| Timekeeping Crystal Frequency | 32.768 kHz |
| Schnittstelle | I2C-compatible two-wire serial interface |
| EEPROM Capacity | 1 Kbit |
| SRAM Capacity | 64 bytes |
| Unique ID | Device unique identifier |
| Backup Power | Battery switchover and power-failure timestamp function |
| Timekeeping Features | Automatic month-length and leap-year correction |
| Clock Format | 24-hour or 12-hour operation with AM/PM indicator |
| Alarm Support | Programmable alarms to second, minute, hour, day of week, date, or month |
| Clock Output | Programmable CLKOUT |
| Gehäuse | 8-MSOP, 0.118 inch width, 3.00 mm width |
| Montageart | Surface mount |
| Digital Timing Compensation | Supported for improved clock accuracy |
| I2C Address | 0x6F according to the referenced MCP79410 design guidance |
| RoHS-Status | Unknown |
MCP79410-I/MS Pin-Konfiguration
| Pin 1 | SCL — I2C clock input |
| Pin 2 | SDA — I2C data input/output |
| Pin 3 | VSS — Ground |
| Pin 4 | VDD — Primary supply |
| Pin 5 | OSC1 — Crystal oscillator input |
| Pin 6 | OSC2 — Crystal oscillator output |
| Pin 7 | VBAT — Backup supply input |
| Pin 8 | VSS2 — Ground connection |
Typische Anwendungen
MCP79410-I/MS ist geeignet für 6 Anwendungs: Industrial Data Logger, Battery-Backed Metering, Embedded Communication Equipment, Precision Test and Measurement, Battery-Powered IoT Sensor Node, Consumer and Appliance Timekeeping.
Industrial Data Logger
The MCP79410-I/MS is a good fit for an industrial data logger that must retain timestamps, configuration data, and event records during power interruptions. Its 1.8 V to 5.5 V operating range accommodates embedded systems, while the 1 Kbit EEPROM provides nonvolatile storage for calibration values, sample counters, or fault records. The 64-byte SRAM can hold temporary data during logging operations. The 32.768 kHz crystal timebase provides a dedicated clock independent of the main processor, and the battery-switchover circuit protects the timekeeping function and memory when the primary supply disappears. Firmware should configure the timestamp and alarm registers before starting a long acquisition campaign.
Empfohlen
Battery-Backed Metering
For utility, industrial, and smart-metering equipment, the MCP79410-I/MS provides a compact, low-power timekeeping solution with backup support. The RTC can continue maintaining calendar time from a backup battery while the main supply is removed, allowing the meter to record service windows or outages. Its I2C interface allows a metering microcontroller to read time and write small configuration or event records without using a separate timer peripheral. The 1.8 V minimum supply supports low-power designs, while the 5.5 V maximum gives flexibility across embedded platforms. Designers should select the backup source and verify the device's power-sense and VBATEN behavior against the final schematic.
Empfohlen
Embedded Communication Equipment
The MCP79410-I/MS is useful in communication equipment that needs accurate event timestamps, scheduled alarms, or persistent operational records. Its I2C-compatible two-wire interface can coexist with other serial peripherals when the address map and bus pull-ups are designed correctly. The programmable alarm and CLKOUT functions can support periodic wake-ups or external timing needs, while the RTC timebase continues through processor resets. The 8-MSOP package helps conserve board area in compact communication modules. Before deployment, verify the I2C bus voltage, address assignment, crystal layout, and backup-battery endurance for the expected field-maintenance interval.
Empfohlen
Precision Test and Measurement
Test and measurement instruments can use the MCP79410-I/MS to maintain a stable calendar reference and associate readings with precise event times. The RTC's nonvolatile EEPROM can hold instrument configuration, calibration flags, or user-selectable settings, while the SRAM can support temporary working data. A dedicated 32.768 kHz timebase is preferable to deriving long-term timestamps solely from a processor clock because it remains available during resets and low-power states. The compact package is useful for portable instruments, but accuracy depends on the specified crystal, load capacitance, PCB contamination, and temperature conditions. Firmware should read the device ID and verify time after every power transition.
Empfohlen
Battery-Powered IoT Sensor Node
The MCP79410-I/MS suits connected sensor nodes that need local timestamps, event history, and low-power backup behavior. The 1.8 V to 5.5 V range supports a broad range of embedded supply rails, and the RTC avoids dedicating a high-power processor timer to timekeeping. A sensor node can use EEPROM for persistent counters and SRAM for a short working buffer, while the backup circuit protects the timebase during brief supply interruptions. Scheduled alarms can help coordinate periodic sensing and communications. The design should account for the backup battery's leakage, the current draw of the sensor and radio, and the RTC's operating temperature range. The I2C pull-ups and crystal network are critical to reliable low-power operation.
Empfohlen
Consumer and Appliance Timekeeping
The MCP79410-I/MS can add dependable timekeeping to appliances, consumer products, and small control boards where a power cycle should not erase the clock. Its calendar registers support automatic month-length and leap-year handling, reducing firmware complexity compared with manually managed counters. EEPROM storage can hold configuration history or service counters, and the backup-power function can preserve time during short outages. The I2C interface minimizes pin count and allows the host microcontroller to manage time through a standard serial bus. For consumer equipment, validate the backup-source lifetime, startup behavior, and operating-temperature range. If the product does not need persistent data or outage timestamps, a simpler RTC may reduce cost and design effort.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MCP79410-I/MS – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MCP79411-I/MS | MCP79412-I/MS | MCP79410T-I/MS | MCP79412T-I/MS | MCP79410-I/SN |
|---|---|---|---|---|---|---|
| Product Category | I2C real-time clock/calendar | I2C real-time clock/calendar | I2C real-time clock/calendar | I2C real-time clock/calendar | I2C real-time clock/calendar | I2C real-time clock/calendar |
| Package | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP | SOIC-8 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
Wichtigste Unterscheidungsmerkmale
- Integrated timekeeping and nonvolatile storage (vs. Basic RTC without integrated EEPROM)
- Backup power and outage awareness (vs. RTS without battery switchover)
- Compact 8-MSOP integration (vs. Larger packaged RTC module)
- I2C host integration (vs. Processor-dedicated timer software)
Designhinweise
Place the 32.768 kHz crystal and its load capacitors close to the MCP79410-I/MS OSC1 and OSC2 pins. Keep oscillator traces short, minimize parallel routing with noisy or fast-switching signals, and provide a quiet ground return. Use the manufacturer's recommended land pattern and verify the crystal load capacitance, ESR, and startup requirements in the current datasheet before production release.
The MCP79410-I/MS supports backup operation, so the primary and backup supply paths must be designed together. Confirm the VBAT and VBATEN configuration, battery voltage range, leakage expectations, and switchover timing for the application. Do not assume backup functionality is active until firmware enables the required control bits and the board has been tested across normal, interrupted, and restored supply conditions.
Do not assume that a mechanically similar RTC is firmware-compatible. The I2C address, register map, alarm behavior, oscillator startup, memory access, and backup-power settings must be checked against the MCP79410 datasheet and the replacement datasheet. In particular, the referenced design guidance identifies address 0x6F and VBATEN configuration differences when considering a DS1307 migration.
Use I2C pull-up resistors sized for the bus voltage, total capacitance, and required rise time. Place the pull-ups at the appropriate bus location, maintain compatible logic levels across all connected devices, and keep the RTC's SDA and SCL traces away from high-current switching paths. Validate bus timing at the highest supported clock rate and during backup-power transitions.
The MCP79410-I/MS is a low-power clock and calendar IC, but the complete board still requires normal temperature-rise and battery-life analysis. Estimate total board current in active and sleep states, including the RTC, crystal network, backup source, pull-ups, and connected peripherals. Use the estimated operating current and expected duty cycle to verify battery life and temperature performance; these are design calculations rather than manufacturer specifications.
Compliance-Informationen
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance claims should be confirmed from the current manufacturer product documentation and distributor declarations.
