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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP79411 Datasheet

(MCP79410 - MCP79412) Real-Time Clock/Calendar

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MCP79410/MCP79411/MCP79412
Battery-Backed I2C Real-Time Clock/Calendar with
SRAM, EEPROM and Protected EEPROM
Device Selection Table
Part Number
Protected EEPROM
MCP79410
MCP79411
MCP79412
Unprogrammed
EUI-48
EUI-64
Timekeeping Features
• Real-Time Clock/Calendar (RTCC):
- Hours, minutes, seconds, day of week, day,
month, year
- Leap year compensated to 2399
- 12/24-hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 ppm resolution
- ±129 ppm range
• Dual Programmable Alarms
• Versatile Output Pin:
- Clock output with selectable frequency
- Alarm output
- General purpose output
• Power-Fail Timestamp:
- Time logged on switchover to and from Battery
mode
Low-Power Features
• Wide Voltage Range:
- Operating voltage range of 1.8V to 5.5V
- Backup voltage range of 1.3V to 5.5V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.3V
- Operating from VBAT: 925 nA at 3.0V
• Automatic Switchover to Battery Backup
User Memory
• 64-Byte Battery-Backed SRAM
• 1 Kbit EEPROM Memory:
- Software write-protect
- Page write up to eight bytes
- Endurance: 1M Erase/Write cycles
• 64-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48MAC address (MCP79411)
- EUI-64MAC address (MCP79412)
Operating Ranges
• 2-Wire Serial Interface, I2C Compatible:
- I2C clock rate up to 400 kHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages
• 8-Lead SOIC, MSOP, TSSOP and 2x3 TDFN
General Description
The MCP7941X Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, days, months, years, and day of week. Alarms
can be configured on all counters up to and including
months. For usage and configuration, the MCP7941X
supports I2C communications up to 400 kHz.
The open-drain, multi-functional output can be
configured to assert on an alarm match, to output a
selectable frequency square wave or as a general
purpose output.
The MCP7941X is designed to operate using a
32.768 kHz tuning fork crystal with external crystal load
capacitors. On-chip digital trimming can be used to
adjust for frequency variance caused by crystal
tolerance and temperature.
SRAM and timekeeping circuitry are powered from the
backup supply when main power is lost, allowing the
device to maintain accurate time and the SRAM
contents. The times when the device switches over to
the back-up supply and when primary power returns are
both logged by the power-fail timestamp.
The MCP7941X features 1 Kbit of internal nonvolatile
EEPROM with software write-protectable regions. There
is an additional 64 bits of protected nonvolatile memory
which is only writable after an unlock sequence, making
it ideal for storing a unique ID or other critical
information. The MCP79411 and MCP79412 are
preprogrammed with EUI-48 and EUI-64 addresses,
respectively. Custom programming is also available.
Package Types
SOIC, TSSOP, MSOP
X1
X2
VBAT
VSS
1
2
3
4
8 VCC
7 MFP
6 SCL
5 SDA
TDFN
X1 1
X2 2
VBAT 3
VSS 4
8 VCC
7 MFP
6 SCL
5 SDA
2010-2018 Microchip Technology Inc.
DS20002266J-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP79411 Datasheet

(MCP79410 - MCP79412) Real-Time Clock/Calendar

No Preview Available !

MCP79410/MCP79411/MCP79412
FIGURE 1-1:
TYPICAL APPLICATION SCHEMATIC
VCC
PIC® MCU
VCC
VCC
8
VCC
X1 1
6 SCL
5 SDA
X2 2
7 MFP
VBAT 3
VSS
4
CX1
CX2 M
VBAT
FIGURE 1-2:
BLOCK DIAGRAM
VCC
VSS
VBAT
Power Control
and Switchover
Power-Fail
Timestamp
SCL
SDA
X1
X2
I2C Interface
and Addressing
32.768 kHz
Oscillator
Control Logic
SRAM
EEPROM
Clock Divider
Digital Trimming
Square Wave
Output
Alarms
MFP
Output Logic
Configuration
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
2010-2018 Microchip Technology Inc.
DS20002266J-page 2


Part Number MCP79411
Description (MCP79410 - MCP79412) Real-Time Clock/Calendar
Maker Microchip
Total Page 30 Pages
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