MCP79410_13 Datasheet, PDF (1/60 Pages) Microchip Technology – Battery-Backed I2C™ Real-Time Clock/Calendar with EEPROM and Unique ID

MCP79410/MCP79411/MCP79412
Battery-Backed I²C™ Real-Time Clock/Calendar with
EEPROM and Unique ID
Device Selection Table
Part Number
Unique ID
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 2099
- 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
• Dual Programmable Alarms
• Multifunction Output Pin:
- Clock out with selectable frequency
- Alarm output
- Programmable operation
• Power-Fail Time-Stamp:
- Time logged on Power-up/down
Low-Power Features:
• Wide Operating Voltage:
- VCC: 1.8V to 5.5V
- VBAT: 1.3V to 5.5V
• Low Typical Operating Current:
- VCC Standby: 5 µA
- VBAT Standby: 700 nA
• Automatic Battery Switchover
User Memory:
• 64-byte Battery-Backed SRAM
• 1 Kbit EEPROM Memory:
- Software write-protect
- Page write up to 8 bytes
- Endurance: 1M Erase/Write cycles
• 64-bit Protected EEPROM Memory Area:
- Robust write unlock sequence
- EUI-48^™ MAC address
- EUI-64^™ MAC address
- Custom specified
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 collector, multifunctional output can be
configured to assert on an alarm match, on
modification of an internal register or to output a
selectable frequency square wave.
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
back-up supply allowing the device to maintain
accurate time and the SRAM contents when the main
supply is unavailable. The time when the device
switches over to the back-up supply and returns to
main power is logged by the power-fail time-stamp.
The MCP7941X features 1 Kbit of internal nonvolatile
EEPROM with software write-protectable regions.
There is an additional 64 bits of nonvolatile memory,
referred to as the unique ID space, which is only
writable after an unlock sequence. The MCP7941X
device is available with the unique ID space pre-
programmed with EUI-48 or EUI-64 unique MAC ID’s
or unprogrammed.
Package Types
SOIC, TSSOP, MSOP
X1 1
X2 2
V_BAT
3
VSS
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
 2010-2013 Microchip Technology Inc.
DS20002266E-page 1