MCP79400_16 Datasheet, PDF (55/62 Pages) Microchip Technology – Battery-Backed I2C Real-Time Clock/Calendar with SRAM and Protected EEPROM

MCP79400/MCP79401/MCP79402
APPENDIX A: REVISION HISTORY
Revision A (04/2011)
Initial release of this document.
Revision B (08/2011)
Added Figure 1-2; Added Parameter D16 to Table 1-1;
Added Sections 2.3-2.5; Added Figure 4.1; Revised
Section 4.1.1; Revised Sections 4.2.4-4.2.6.
Revision C (12/2011)
Added DC/AC Characteristics Charts.
Revision D (01/2014)
Updated overall content for improved clarity; Added
detailed descriptions of registers; Updated block
diagram and application schematic; Defined names for
all bits and registers, and renamed the bits shown in
Table 7-1 for clarification; Renamed the DC
characteristics shown in Table 7-2 for clarification.
TABLE 7-1: BIT NAME CHANGES
Old Bit Name
New Bit Name
OSCON
VBAT
LP
SQWE
ALM0
ALM1
RS0
RS1
RS2
CALIBRATION
ALM0POL
ALM1POL
ALM0C<2:0>
ALM1C<2:0>
OSCRUN
PWRFAIL
LPYR
SQWEN
ALM0EN
ALM1EN
SQWFS0
SQWFS1
CRSTRIM
TRIMVAL<6:0>
ALMPOL
ALMPOL
ALM0MSK<2:0>
ALM1MSK<2:0>
TABLE 7-2: DC CHARACTERISTIC NAME CHANGES
Old Name
Old Symbol
New Name
Operating Current ID
Operating Current SRAM
Operating Current
Standby Current
ICC Read
ICC Write
ICC Read
ICC Write
IVCC
IBAT
ICCS
EEPROM Operating Current
SRAM/RTCC Register Operating Current
Timekeeping Current
Timekeeping Backup Current
VCC Data Retention Current (oscillator off)
New Symbol
ICCEERD
ICCEEWR
ICCREAD
ICCWRITE
ICCT
IBATT
ICCDAT
Revision E (01/2015)
Updated Section 6.3; Updated “Product Identification
System” section.
Revision F (08/2016)
Added new OUI (54-10-EC) to list; Updated TDFN
package.
 2011-2016 Microchip Technology Inc.
DS20005009F-page 55