Microchip Technology Inc
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MCP79402

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

Status: In Production

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
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

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.

Additional Features

    General purpose RTCC with features that target low power and smart energy applications.

    • Low Power Operation
      • VCC Min = 1.8V
      • Icc < 5 µA Typical Dynamic Current
    • Low Backup Power
      • VBAT Min = 1.3V
      • Ibat < 700nA Typical Timekeeping & SRAM Retention Current
    • Automatic Battery Switchover with Timestamp
      • 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
    • Digital Trimming Range from -127 to + 127 ppm in 1 ppm steps
      • 1 ppm is approximately 86 milliseconds/day
    • EEPROM uses 8 bytes/page with Block Sector write protection
      • Protect none, 1/4, 1/2 or all of array
    • Unique ID is factory programmed with MAC Address
Parametrics
Name
Value
Max Communications Speed
400 KHz
Pin Count
8
Minimum Clock Count (seconds)
1 sec
Battery-backed SRAM (Bytes)
64
Unique ID (bits)
64
Unique ID Programming
EUI-64
Temperature Range (C)
-40 to +85

Documents

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Errata

Gerber Files

Sample Code

08/21/2012
61KB
08/21/2012
152KB

Development Environment

  • Demo & Evaluation Boards
Demo & Evaluation Boards
MCP79410 RTCC PICtail Plus Daughter Board
MCP79410 RTCC PICtail Plus Daughter Board ( AC164140 )

The MCP7941X RTCC PICtail™ Plus Daughter Board demonstrates the features and abilities of the MCP7941X and MCP7940X I²C™ Real-Time Clock/Calendar family in standard development platforms. By designing this daughter board with the PICtail Plus, PICtail and PICkit™ serial connectors, it will operate with the Explorer 16 Development Board, the PICDEM PIC18 Explorer Board, the...

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RoHS Information

Part Number
Device Weight
Shipping Weight
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MCP79402-I/SN
0.078000
0.160000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
Rohs icon
efup china icon
MCP79402T-I/SN
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
Rohs icon
efup china icon
MCP79402T-I/ST
0.033000
0.215600
8
TSSOP
4.4mm
Matte Tin
e3
Rohs icon
efup china icon
MCP79402-I/ST
0.033000
0.090000
8
TSSOP
4.4mm
Matte Tin
e3
Rohs icon
efup china icon
MCP79402-I/MS
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
Rohs icon
efup china icon
MCP79402T-I/MS
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
Rohs icon
efup china icon
MCP79402T-I/MNY
0.014300
0.248485
8
TDFN
2x3x0.8mm
NiPdAu
e4
Rohs icon
efup china icon
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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