MCP79402T-I/ST More Semiconductors - ICs by Microchip Technology

Battery-Backed I2C Real-Time Clock/Calendar with Pre-Programmed EUI-64™ MAC ID

Status: Active
Series: MCP79402
RoHS: Compliant
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The MCP79402 general purpose I2CTM Compatible real-time clock/calendar (RTCC) is highly integrated with memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies. In addition to the SRAM memory, there a unique ID that is factory programmed in a locked section of EEPROM with a MAC Address. This ID can also be unlocked and reprogrammed by the end user.

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Features

VCC Min = 1.8V
Icc < 5 µA Typical Dynamic Current
VBAT Min = 1.3V
Ibat < 700nA Typical Timekeeping & SRAM Retention Current
VCC to VBAT (power lost)
VBAT to VCC (power restored)
Dual alarms with single Interrupt Output that operates on VCC or VBAT
Clock Out frequencies of 32.768, 8.192 & 4.096 KHz and 1 Hz
1 ppm is approximately 86 milliseconds/day
Protect none, 1/4, 1/2 or all of array
Unique ID is factory programmed with MAC Address

Specifications

Max Interface Speed 400 KHz
Pin Count 8
Minimum Clock_Count 1 sec
User SRAM (Bytes) 64
EEPROM Data Memory Bytes 0
Unique_ID (Bits) 64
Unique ID with MAC Addr EUI-64
Temperature Range -40 to +85
Pins | Packaging 8 | TSSOP
Temp Range -40C to +85C
Packing Media Tape and reel (2500)

Resources



Application Notes
AN1355 - A Complete Electronic Watch Based on MCP79410 I2C? RTCC
AN1364 - Using the Alarm Feature on the MCP79410 RTCC to Implement a Delayed Alarm
AN1365 - Recommended Usage of Microchip Serial RTCC Devices
AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410
AN1414 - Using HI-TECH C Compiler to Interface RTCC Devices to 8-Bit PIC MCUs
AN1491 - Configuring the MCP794XX RTCC Family
AN1496 - Debugging Stand-Alone Real-Time Clock/Calender-based Applications
AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar Devices
TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCs
AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMs
TB3187 - Organizationally Unique Identifiers for Preprogrammed EUI-48 and EUI-64 Address Devices





Environmental Information

JEDEC Indicator e3
ROHS Compliant
China EFUP Compliant
Device Weight (g) 0.033
Shipping Weight (kg) 0.2156
Lead Count 8
Package Type TSSOP
Package Width or Size 4.4mm
Soldering Composition Matte Tin

Alternative Descriptions

Real Time Clock/Calendar, -40 To 85Deg C | Newark Electronics
Real Time Clock Serial 64Byte 8-Pin TSSOP T/R | Avnet America
I2C GP RTCC, 64B SRAM, EUI-64 | Microchip Technology
I2C GP RTCC, 64B SRAM, EUI-64 | Microchip Technology Inc. MCP79402T-I/ST | RS Americas
REAL TIME CLOCK/CALENDAR, -40 TO 85DEG C | Farnell


Frequently Asked Questions

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Is the MCP79402T-I/ST RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Microchip Technology.

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