MCP7952X/MCP7951X
3V SPI Real-Time Clock Calendar with Battery Switchover
Device Selection Table
Part Number
MCP79520
MCP79510
MCP79521
MCP79511
MCP79522
MCP79512
SRAM
(Bytes)
64
64
64
64
64
64
EEPROM
(Kbits)
2
1
2
1
2
1
Unique ID
Blank
Blank
EUI-48
™
EUI-48
™
EUI-64
™
EUI-64
™
User Memory:
• 64-Byte Battery-Backed SRAM
• 2 Kbit and 1 Kbit EEPROM Memory:
- Software block write-protect (¼, ½, or entire
array)
- Write Page mode (up to 8 bytes)
- Endurance: 1M erase/write cycles
• 128-Bit Unique ID in Protected Area of EEPROM:
- Available blank or preprogrammed
- EUI-48™ or EUI-64™ MAC address
- Unlock sequence for user programming
Timekeeping Features:
• Real-Time Clock/Calendar:
- Hours, Minutes, Seconds, Hundredth of
Seconds, Day of Week, Month, Year, Leap
Year
• Crystal Oscillator requires External 32,768 kHz
Tuning Fork Crystal and Load Capacitors.
• Clock Out Function:
- 1Hz, 4.096 kHz, 8.192 kHz, 32.768 kHz
• 2 Programmable Alarms
• Programmable open drain output – Alarm or
Interrupt
• On-Chip Digital Trimming/Calibration:
- +/- 255 PPM range in 1 PPM steps
• Power-Fail Time-Stamp @ Battery Switchover:
- Logs time when V
CC
fails and V
CC
is restored
Operating Ranges:
• SPI Clock Speed up to 5 MHz
• Operating Temperature Ranges:
- Industrial (I Temp): -40°C to +85°C.
• Packages include 10-Lead MSOP and TDFN
Package Types (not to scale)
MSOP/TDFN
X1
X2
V
BAT
CS
V
SS
1
2
3
4
5
10
Vcc
MFP
SCK
SO
SI
MCP795XX
9
8
7
6
Low-Power Features:
• Wide Operating Voltage:
- V
CC
: 1.8V to 3.6V
- V
BAT
: 1.3V to 3.6V
• Low Operating Current:
- V
CC
Standby Current < 1uA @ 3V
- V
BAT
Timekeeping Current: <700nA @ 1.8V
• Automatic Battery Switchover from V
CC
to V
BAT
:
- Backup power for timekeeping and SRAM
retention
Note:
MCP795XX is used in this document as a
generic part number for the MCP7951X,
MCP7952X devices.
2012 Microchip Technology Inc.
Preliminary
DS22300A-page 1
MAS [ MICRO ANALOG SYSTEMS ]
