MCP7940N-ESLASHMS datasheet(53/58 Pages) MICROCHIP

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 2011-2022 Microchip Technology Inc. and its subsidiares

DS20005010J-page 53

MCP7940N

APPENDIX A: REVISION HISTORY

Revision J (04/2022)

Updated Data Sheet for MCP7940N I2C RTCC to

include Automotive part numbers and other fixes;

Updated SOIC, TDFN and TSSOP package drawings;

Replaced terminology “Master” and “Slave” with “Host”

and “Client” respectively.

Revision H (10/2019)

Added notes regarding automotive grade availability;

Corrected MSOP marking rotation; Updated package

drawings SOIC and PDIP.

Revision G (07/2018)

Updated Section 5.5.1 “Square Wave Output Mode”.

Revision F (03/2014)

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

Revision E (01/2013)

Revised Table 1-2: AC Characteristics; temperature

range

Revision D (11/2012)

Added Extended Temp.

Revision C (12/2011)

Added DC/AC Char. Charts.

Revision B (09/2011)

• Added Figure 1-2

• Added Parameter D15 to Table 1-1

• Added Section 3.3 “Oscillator Input/Output (X1,

X2)”, Section 3.4 “Multifunction Pin (MFP)”,

Section 3.5 “Backup Supply (VBAT)”

• Added Figure 5-1

• Updated Section 5.2.3 “Oscillator Failure Status”,

Section 5.2.4 “Crystal Specs”, Section 5.2.5

“Power-fail Time-stamp”.

Revision A (04/2011)

Original release of this document.

TABLE 7-2:

DC CHARACTERISTIC NAME CHANGES

Old Bit Name

New Bit Name

OSCON

OSCRUN

VBAT

PWRFAIL

LPYR

SQWE

SQWEN

ALM0

ALM0EN

ALM1

ALM1EN

RS0

SQWFS0

RS1

SQWFS1

RS2

CRSTRIM

CALIBRATION

TRIMVAL<6:0>

ALM0POL

ALMPOL

ALM1POL

ALMPOL

ALM0C<2:0>

ALM0MSK<2:0>

ALM1C<2:0>

ALM1MSK<2:0>

Old Bit Name

New Bit Name

Old Name

Old Symbol

New Name

New Symbol

Operating current SRAM

ICC Read

SRAM/RTCC register operating current

ICCREAD

ICC Write

ICCWRITE

Operating current

IVCC

Timekeeping current

ICCT

IBAT

Timekeeping backup current

IBATT

Standby current

ICCS

VCC data retention current (oscillator off)

ICCDAT

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