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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP79511 Datasheet

Battery-Backed SPI Real-Time Clock/Calendar

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MCP7951X/MCP7952X
Battery-Backed SPI Real-Time Clock/Calendar
Device Selection Table
Part Number
SRAM
(Bytes)
EEPROM
(Kbits)
Unique ID
MCP79510
MCP79520
MCP79511
MCP79521
MCP79512
MCP79522
64
64
64
64
64
64
1 Blank
2 Blank
1 EUI-48
2 EUI-48
1 EUI-64
2 EUI-64
Timekeeping Features
• Real-Time Clock/Calendar (RTCC):
- Hours, minutes, seconds, hundredth of
seconds, day of week, date, 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
- ±259 ppm range
• Dual Programmable Alarms
• Clock Output Function with Selectable Frequency
• 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 3.6V
- Backup voltage range of 1.3V to 3.6V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.0V
- Operating from VBAT: 1.0 µA at 3.0V
• Automatic Switchover to Battery Backup
User Memory
• 64-Byte Battery-Backed SRAM
• 1 Kbit or 2 Kbit EEPROM:
- Software write-protect
- Page write up to 8 bytes
- Endurance: one million erase/write cycles
• 128-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48™ MAC address (MCP795X1)
- EUI-64™ MAC address (MCP795X2)
Operating Ranges
• SPI Serial Interface:
- SPI clock rate up to 5 MHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages
• 10-Lead MSOP and TDFN
Package Types (not to scale)
MSOP/TDFN
X1 1
X2 2
VBAT 3
CS 4
VSS 5
10 VCC
9 MFP
8 SCK
7 SO
6 SI
Note:
MCP795XX is used in this document as a
generic part number for the MCP7951X
and MCP7952X devices.
2012-2018 Microchip Technology Inc.
DS20002300C-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP79511 Datasheet

Battery-Backed SPI Real-Time Clock/Calendar

No Preview Available !

MCP7951X/MCP7952X
Description
The MCP795XX Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, hundredth of 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 MCP795XX supports SPI
communications up to 5 MHz.
The MCP795XX 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 backup supply and when primary power returns
are both logged by the power-fail timestamp.
The MCP795XX features 128 bits of EEPROM which
is only writable after an unlock sequence, making it
ideal for storing a unique ID or other critical
information. The MCP795X1 and MCP795X2 are
preprogrammed with EUI-48 and EUI-64 addresses,
respectively. Custom programming is also available.
The MCP795XX has a shared pin for outputting a
selectable frequency square wave or alarm signals.
FIGURE 1-1:
TYPICAL APPLICATION SCHEMATIC
VCC
PIC® MCU
VCC
VCC
10
VCC
X1 1
4 CS
8 SCK
X2 2
6 SI MCP795XX VBAT 3
7 SO
CX1
CX2
VBAT
9 MFP
VSS
5
2012-2018 Microchip Technology Inc.
DS20002300C-page 2


Part Number MCP79511
Description Battery-Backed SPI Real-Time Clock/Calendar
Maker MICROCHIP
Total Page 30 Pages
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