規格
| 屬性 | 價值 |
| Supplier | Microchip Technology |
| Package | Tube |
| ProductStatus | Active |
| Type | Clock/Calendar |
| Features | Alarm, Leap Year, Square Wave Output, SRAM, Unique ID |
| MemorySize | 64B, 1Kb |
| TimeFormat | HH:MM:SS (12/24 hr) |
| DateFormat | YY-MM-DD-dd |
| Interface | I²C, 2-Wire Serial |
| Voltage-Supply | 1.8V ~ 5.5V |
| Voltage-SupplyBattery | 1.3V ~ 5.5V |
| Current-Timekeeping(Max) | 1.2µA @ 3.3V |
| OperatingTemperature | -40°C ~ 85°C |
| MountingType | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
概述
Description
The MCP79412-I/SN is an I2C real-time clock/calendar with embedded nonvolatile memory. It keeps time (seconds to year) and date, and can run from a main supply or battery backup (VBAT) so time is retained during power loss. Key features:
- I2C interface (up to 400 kHz), 7‑bit addressing
- 32.768 kHz crystal oscillator input and optional 1 Hz output
- Programmable square-wave/alarms for wakeup/event signaling
- Battery-backed nonvolatile RAM for data storage (NVSRAM)
- Clock/calendar registers plus alarm/interrupt outputs
- 2.0–5.5 V operation; industrial temp range (-40 to 85°C) in the I-series
- Packaging: 8-pin options; -SN indicates RoHS-compliant, small-outline package
Typical uses: data logging, time-stamping events, and power-fail protection in microcontroller systems.
- I2C interface (up to 400 kHz), 7‑bit addressing
- 32.768 kHz crystal oscillator input and optional 1 Hz output
- Programmable square-wave/alarms for wakeup/event signaling
- Battery-backed nonvolatile RAM for data storage (NVSRAM)
- Clock/calendar registers plus alarm/interrupt outputs
- 2.0–5.5 V operation; industrial temp range (-40 to 85°C) in the I-series
- Packaging: 8-pin options; -SN indicates RoHS-compliant, small-outline package
Typical uses: data logging, time-stamping events, and power-fail protection in microcontroller systems.
Equivalent
Common equivalents (I2C real-time clocks with RAM) to MCP79412-I/SN include:
- ST M41T00 / M41T80
- NXP PCF8563 / PCF2123 / PCF2129
- Maxim DS3231 / DS1307
Note: exact RAM size, pinout, voltage ranges, and I2C addressing differ. Verify datasheets and package compatibility before cross-replacing.
- ST M41T00 / M41T80
- NXP PCF8563 / PCF2123 / PCF2129
- Maxim DS3231 / DS1307
Note: exact RAM size, pinout, voltage ranges, and I2C addressing differ. Verify datasheets and package compatibility before cross-replacing.
Features
Here are the main features of the MCP79412-I/SN:
- I2C real-time clock/calendar with a 32.768 kHz time base
- 64 bytes of on-chip non-volatile RAM (NV RAM) for user data
- Two alarms (Alarm 1 and Alarm 2) with configurable match conditions
- Square-wave (SQW) output with programmable frequency
- VBAT battery-backup support with automatic switchover and low current in battery mode
- Trickle-charge capability for backup battery via external components
- Interrupt output (INT/SQW) for alarm or power-fail events
- 8-pin package (I/SN, RoHS) suitable for small boards
- I2C interface up to fast-mode (400 kHz)
- Wide operating voltage range (typically 2.0V to 5.5V)
- Power-fail/data retention during power-down (data remains in NV RAM)
These make it a compact RTC plus non-volatile RAM solution with alarms, square-wave timing, and battery-backed operation.
- I2C real-time clock/calendar with a 32.768 kHz time base
- 64 bytes of on-chip non-volatile RAM (NV RAM) for user data
- Two alarms (Alarm 1 and Alarm 2) with configurable match conditions
- Square-wave (SQW) output with programmable frequency
- VBAT battery-backup support with automatic switchover and low current in battery mode
- Trickle-charge capability for backup battery via external components
- Interrupt output (INT/SQW) for alarm or power-fail events
- 8-pin package (I/SN, RoHS) suitable for small boards
- I2C interface up to fast-mode (400 kHz)
- Wide operating voltage range (typically 2.0V to 5.5V)
- Power-fail/data retention during power-down (data remains in NV RAM)
These make it a compact RTC plus non-volatile RAM solution with alarms, square-wave timing, and battery-backed operation.
Pinout
Pin count: 14 pins (SOIC-14/PDIP-14).
Function: I2C real-time clock/calendar with on-chip RAM (battery-backed) and alarm/square-wave outputs. It provides timekeeping, calendar data, and basic memory/alarm features via the I2C bus.
Function: I2C real-time clock/calendar with on-chip RAM (battery-backed) and alarm/square-wave outputs. It provides timekeeping, calendar data, and basic memory/alarm features via the I2C bus.
Manufacturer
- Manufacturer: Microchip Technology Inc.
- What kind of company: An American multinational semiconductor company that designs, develops, manufactures, and sells microcontrollers, memory, and analog/digital ICs for embedded systems.
- What kind of company: An American multinational semiconductor company that designs, develops, manufactures, and sells microcontrollers, memory, and analog/digital ICs for embedded systems.
Application
MCP79412-I/SN is an I2C real-time clock/calendar with battery-backed non-volatile memory. Common applications include:
- Timekeeping, scheduling, and wake-up control in microcontroller systems
- Data logging and time-stamped records in portable instruments
- Power-fail safe operation with automatic resume and alarm/interrupt features
- Low-power devices requiring periodic wake-ups or timed events
- General timebase for automotive, industrial, consumer, medical, and instrumentation applications
In short: accurate timekeeping plus non-volatile storage for embedded systems and data logging.
- Timekeeping, scheduling, and wake-up control in microcontroller systems
- Data logging and time-stamped records in portable instruments
- Power-fail safe operation with automatic resume and alarm/interrupt features
- Low-power devices requiring periodic wake-ups or timed events
- General timebase for automotive, industrial, consumer, medical, and instrumentation applications
In short: accurate timekeeping plus non-volatile storage for embedded systems and data logging.
Package
MCP79412-I/SN comes in an 8-pin Small Outline Integrated Circuit (SOIC) package, RoHS-compliant (industrial temperature range).
