MCP79401 MICROCHIP [Microchip Technology], MCP79401 Datasheet

MCP79401

Manufacturer Part Number

MCP79401

Description

Manufacturer

MICROCHIP [Microchip Technology]

Datasheet

1.MCP79401.pdf (38 pages)

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Device Selection Table

Features:

• Real-Time Clock/Calendar (RTCC), Battery

• On-Chip Digital Trimming/Calibration:

• Programmable Open-Drain Output Control:

• 64 Bytes SRAM, Battery Backed

• 64-Bit Unique ID:

• Automatic V

• Power-Fail Time-Stamp for Battery Switchover

• Low-Power CMOS Technology:

• 100 kHz and 400 kHz Compatibility

• ESD Protection >4,000V

• 1 Million Erase/Write Cycles for Unique ID

• Packages include 8-Lead SOIC, TSSOP, 2x3

• Pb-Free and RoHS Compliant

• Temperature Ranges:

 2011 Microchip Technology Inc.

Part Number

Backed:

- Hours, Minutes, Seconds, Day of Week, Day,

- Dual alarm with single output

- Range -127 to +127 ppm

- Resolution 1 ppm

- CLKOUT with 4 selectable frequencies

- Alarm output

- User or factory programmable

- Protected EEPROM

- EUI-48

- Custom ID programming

Supply

- Dynamic Current: 400 A max read

- Dynamic Current: 400 A max SRAM

- Battery Backup Current: <700nA @ 1.8V

TDFN, MSOP

- Industrial (I): -40°C to +85°C

MCP79400

MCP79401

MCP79402

Month and Year

™

C™ Real-Time Clock/Calendar with SRAM, Unique ID

or EUI-64

Switchover to V

(Bytes)

™

SRAM

MAC address

BAT

Backup

and Battery Switchover

MCP79400/MCP79401/MCP79402

Unique ID

EUI-48

EUI-64

Blank

™

Description:

The MCP7940X series of low-power Real-Time Clocks

(RTC) uses digital timing compensation for an accurate

clock/calendar, a programmable output control for

versatility, a power sense circuit that automatically

switches to the backup supply, and nonvolatile memory

for data storage. Using a low-cost 32.768 kHz crystal,

it tracks time using several internal registers. For

communication, the MCP7940X uses the I

The clock/calendar automatically adjusts for months

with fewer than 31 days, including corrections for

leap years. The clock operates in either the 24-hour

or 12-hour format with an AM/PM indicator and

the week, date or month. Using the programmable

CLKOUT, frequencies of 32.768, 8.192 and 4.096

kHz and 1 Hz can be generated from the external

crystal.

Along with the battery-backed SRAM memory, a 64-bit

protected EEPROM space is available for a unique ID

or MAC address to be programmed at the factory or by

the end user.

The device is fully accessible through the serial

interface while V

operate down to 1.3V for timekeeping and SRAM

retention only.

The RTC series of devices are available in the standard

8-lead SOIC, TSSOP, MSOP and 2x3 TDFN packages.

Package Types

settable alarm(s) to the second, minute, hour, day of

BAT

SOIC, TSSOP

MSOP

is between 1.8V and 5.5V, but can

MFP

SCL

SDA

MFP

SCL

SDA

BAT

DS25009A-page 1

TDFN

C™ bus.

MFP

SCL

SDA

Related parts for MCP79401

MCP79401 Summary of contents

Page 1

... Packages include 8-Lead SOIC, TSSOP, 2x3 TDFN, MSOP • Pb-Free and RoHS Compliant • Temperature Ranges: - Industrial (I): -40°C to +85°C  2011 Microchip Technology Inc. MCP79400/MCP79401/MCP79402 and Battery Switchover Description: The MCP7940X series of low-power Real-Time Clocks Unique ID (RTC) uses digital timing compensation for an accurate ...

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MCP7940X FIGURE 1-1: TYPICAL OPERATING CIRCUIT X1 RTCC Time-Stamp/ SRAM Alarms Switch BAT BAT DS25009A-page MFP 2 I C™ SCL SDA  2011 Microchip Technology Inc. ...

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ELECTRICAL CHARACTERISTICS (†) Absolute Maximum Ratings V .............................................................................................................................................................................6.5V CC All inputs and outputs w.r.t. V ..........................................................................................................-0. Storage temperature ...............................................................................................................................-65°C to +150°C Ambient temperature with power applied................................................................................................-40°C to +125°C ESD protection on all pins  ...

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MCP7940X TABLE 1-2: AC CHARACTERISTICS AC CHARACTERISTICS Param. Symbol Characteristic No Clock frequency CLK 2 T Clock high time HIGH 3 T Clock low time LOW 4 T SDA and SCL rise time R (Note ...

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FIGURE 1-2: BUS TIMING DATA 5 SCL 7 3 SDA SDA Out  2011 Microchip Technology Inc MCP7940X DS25009A-page 5 ...

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MCP7940X 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in FIGURE 2-1: DEVICE PINOUTS SOIC/DFN/MSOP/TSSOP Vcc MFP SCL BAT Vss 4 5 SDA 2.1 Serial Data (SDA) This is ...

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I C BUS CHARACTERISTICS 2 3 Interface The MCP7940X supports a bidirectional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as ...

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MCP7940X FIGURE 3-2: ACKNOWLEDGE TIMING SCL SDA Data from transmitter Transmitter must release the SDA line at this point allowing the Receiver to pull the SDA line low to acknowledge the previous eight bits of data. ...

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ACKNOWLEDGE POLLING Since the device will not acknowledge a Unique ID command during an ID write cycle, this can be used to determine when the cycle is complete. This feature can be used to maximize bus throughput. Once the ...

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MCP7940X 4.0 RTCC FUNCTIONALITY The MCP7940X family is a highly integrated RTCC. On-board time and date counters are driven from a low- power oscillator to maintain the time and date. An integrated V switch enables the device to maintain CC ...

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TABLE 4-1: RTCC MEMORY MAP (CONTINUED) Address Bit 7 Bit 6 Bit 5 1Ch 10 Minutes 1Dh 10 Hour 12/24 AM/PM 1Eh 10 Date 1Fh Day 4.1.1 RTCC REGISTER ADDRESSES 0x00h – Contains the BCD seconds and 10 seconds. The ...

Page 12

MCP7940X • ALMxPOL: This bit specifies the level that the MFP will drive when the alarm is triggered. ALM2POL is a copy of ALM1POL. The default state of the MFP when used for alarms is the inverse of ALM1POL. • ...

Page 13

CALIBRATION The MCP7940X utilizes digital calibration to correct for inaccuracies of the input clock source (either external or crystal). Calibration is enabled by setting the value of the Calibration register at address 08H. Calibration is achieved by adding or ...

Page 14

MCP7940X In the case where the MSB of the Calibration register is set to ‘1’, the MFP output waveforms that appear when bits RS1 and RS0 are set to ‘01’ or ‘10’ are not as responsive to the setting of ...

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POWER-FAIL TIME-STAMP The MCP7940X family of RTCC devices feature a power-fail time-stamp feature. This feature will save the time at which V crosses the V CC use this feature supply must be present and BAT the oscillator ...

Page 16

MCP7940X 5.0 ON BOARD MEMORY The MCP7940X has both on-board Unique ID memory and battery-backed SRAM. The SRAM is arranged bytes and is retained when the V 5.1 SRAM FIGURE 5-1: SRAM/RTCC BYTE WRITE BUS ACTIVITY ...

Page 17

ID 5.2.1 ID BYTE WRITE Following the Start condition from the master, the control code and the R/W bit (which is a logic low) are clocked onto the bus by the master transmitter. This indicates to the addressed slave ...

Page 18

MCP7940X FIGURE 5-3: ID BYTE WRITE BUS ACTIVITY MASTER SDA LINE BUS ACTIVITY 5.2.2 READ OPERATION Read operations are initiated in the same way as write operations with the exception that the R/W bit of the control byte is set ...

Page 19

FIGURE 5-5: RANDOM READ (UNIQUE ID SHOWN) S BUS ACTIVITY T CONTROL MASTER A BYTE R T SDA LINE BUS ACTIVITY FIGURE 5-6: SEQUENTIAL READ (UNIQUE ID SHOWN) CONTROL BUS ACTIVITY BYTE MASTER SDA LINE ...

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... XXXX TYWW NNN 8-Lead MSOP XXXXX YWWNNN 8-Lead 2x3 TDFN XXX YWW NN Part Number MCP79400 MCP79401 MCP79402 Note Temperature grade NN = Alphanumeric traceability code Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) ...

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Microchip Technology Inc. MCP7940X DS25009A-page 21 ...

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MCP7940X DS25009A-page 22  2011 Microchip Technology Inc. ...

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Microchip Technology Inc. MCP7940X DS25009A-page 23 ...

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MCP7940X D N NOTE DS25009A-page φ L  2011 Microchip Technology Inc. ...

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Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging  2011 Microchip Technology Inc. MCP7940X DS25009A-page 25 ...

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MCP7940X D N NOTE DS25009A-page φ L  2011 Microchip Technology Inc. ...

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MCP7940X DS25009A-page 28  2011 Microchip Technology Inc. ...

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Microchip Technology Inc. MCP7940X DS25009A-page 29 ...

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MCP7940X DS25009A-page 30  2011 Microchip Technology Inc. ...

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APPENDIX A: REVISION HISTORY Revision A (04/2011) Original release of this document.  2011 Microchip Technology Inc. MCP7940X DS25009A-page 31 ...

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MCP7940X NOTES: DS25009A-page 32  2011 Microchip Technology Inc. ...

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... MCP79400/MCP79401/MCP79402 THE MICROCHIP WEB SITE Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains information: • Product Support – Data sheets and errata, application notes and sample programs, design resources, user’ ...

Page 34

... MCP79400/MCP79401/MCP79402 READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150 ...

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... MCP79400T-I/MNY: Industrial Tempera- ture, TDFN package Serial RTCC, EUI-48 d) MCP79401-I/SN: Industrial Temperature Serial RTCC, EUI-48 SOIC package, EUI-48 e) MCP79401-I/MS: Industrial Temperature Serial RTCC, EUI-64 MSOP package, EUI- Serial RTCC, EUI-64 f) MCP79402-I/SN: Industrial Temperature, SOIC package, EUI-64 g) ...

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MCP7940X NOTES: DS25009A-page 36  2011 Microchip Technology Inc. ...

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Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families ...

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Worldwide Sales and Service AMERICAS ASIA/PACIFIC Corporate Office Asia Pacific Office 2355 West Chandler Blvd. Suites 3707-14, 37th Floor Chandler, AZ 85224-6199 Tower 6, The Gateway Tel: 480-792-7200 Harbour City, Kowloon Fax: 480-792-7277 Hong Kong Technical Support: Tel: 852-2401-1200 http://www.microchip.com/ ...

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