MCP79410/MCP79411/MCP79412 Battery-Backed I2C™ Real-Time Clock/Calendar with EEPROM and Unique ID Device Selection Table Part Number Operating Ranges: Unique ID MCP79410 Unprogrammed MCP79411 EUI-48™ MCP79412 EUI-64™ • 2-Wire Serial Interface, I2C™ Compatible - I2C Clock Rate up to 400 kHz • Temperature Range: - Industrial (I): -40°C to +85°C Timekeeping Features: Packages: • Real-Time Clock/Calendar (RTCC): - Hours, Minutes, Seconds, Day of Week, Day, Month, Year - Leap year compensated to 2099
MCP79410/MCP79411/MCP79412 FIGURE 1-1: SCHEMATIC 10K VCC 2K VCC 2K VCC 6 5 MCU .1µF 8 X1 SCL SDA X2 MCP7941x 7 VBAT SCL SDA 32.
MCP79410/MCP79411/MCP79412 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings (†) VCC.............................................................................................................................................................................6.5V Maximum voltage on SDA and SCL...........................................................................................................................6.5V All inputs and outputs w.r.t. VSS ..................................................
MCP79410/MCP79411/MCP79412 TABLE 1-1: DC CHARACTERISTICS DC CHARACTERISTICS Param. No. Sym. Characteristic Electrical Characteristics: Industrial (I): VCC = +1.8V to 5.5V Min. Typ. Max. Units TA = -40°C to +85°C Conditions — SCL, SDA pins — — — — D1 VIH High-level input voltage 0.7 VCC — V — D2 VIL Low-level input voltage — 0.3 VCC 0.2 VCC V VCC = 2.5V to 5.5V D3 VHYS Hysteresis of Schmitt Trigger inputs (SDA, SCL pins) 0.
MCP79410/MCP79411/MCP79412 TABLE 1-2: AC CHARACTERISTICS Electrical Characteristics: Industrial (I): VCC = +1.8V to 5.5V AC CHARACTERISTICS Param. Symbol No. Characteristic Min. Max. Units TA = -40°C to +85°C Conditions 1 FCLK Clock frequency — — 100 400 kHz 1.8V VCC < 2.5V 2.5V VCC 5.5V 2 THIGH Clock high time 4000 600 — — ns 1.8V VCC < 2.5V 2.5V VCC 5.5V 3 TLOW Clock low time 4700 1300 — — ns 1.8V VCC < 2.5V 2.5V VCC 5.
MCP79410/MCP79411/MCP79412 I2C BUS TIMING DATA FIGURE 1-3: 5 SCL 7 SDA In D4 2 3 8 9 4 10 6 13 11 12 SDA Out DS20002266E-page 6 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 2.0 DC AND AC CHARACTERISTICS GRAPHS AND CHARTS FIGURE 2-1: TYPICAL IBAT VS. VBAT ACROSS TEMPERATURE 4000 3500 IBAT (nA) 3000 2500 2000 1500 1000 500 1.2 1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2 VBAT (V) -40°C FIGURE 2-2: 0°C 25°C 65°C 85°C TYPICAL IVCC VS. VCC @ 25°C 16 14 IDD (µA) 12 10 ) A (µ 8 D D I 6 4 2 0 1.5 2 2.5 3 3.5 4 4.5 5 5.5 VCC (V) 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN DESCRIPTIONS Pin Name X1 X2 VBAT Vss SDA SCL MFP Vcc Note: Pin Number Pin Function Xtal Input, External Oscillator Input 1 Xtal Output 2 Battery Backup Input 3 Ground 4 Bidirectional Serial Data (I2C™) 5 Serial Clock (I2C) 6 Multifunction Pin 7 Power Supply 8 Exposed pad on TFDN can be connected to Vss or left floating. FIGURE 3-1: DEVICE PINOUTS SOIC/TDFN/MSOP/TSSOP 3.1 3.
MCP79410/MCP79411/MCP79412 4.0 RTCC FUNCTIONALITY The MCP7941X 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 VCC switch enables the device to maintain the time and date, and also the contents of the SRAM during a VCC power failure if an external supply is connected to the VBAT pin and configured. 4.
MCP79410/MCP79411/MCP79412 FIGURE 4-2: MEMORY MAP RTCC Register/SRAM 0x00 EEPROM 0x00 Time and Date 0x06 0x07 0x09 0x0A Configuration and Calibration Alarm 0 EEPROM Memory 0x10 0x11 Alarm 1 0x17 0x18 Time-Stamp 0x1F 0x20 0x7F Unimplemented – Device does not ACK SRAM (64 Bytes) 0xF0 0xF7 0xFF 0x5F I2C™ Address: 1101111x DS20002266E-page 10 Unique ID Location EUI-48/64 STATUS Register I2C™ Address: 1010111x 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 TABLE 4-1: Address DETAILED RTCC MEMORY MAP Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Function Section 5.0 “Time and Date Registers” 00h ST 01h 02h 12/24 03h 10 Seconds Seconds Seconds 10 Minutes Minutes Minutes 10 Hour AM/PM 10 Hour OSCON VBAT VBATEN LP 05h 06h SQWE Day Date 10 Month Date Month 10 Year OUT Hours Day 10 Date 04h 07h Hour Month Year ALM1 ALM0 EXTOSC RS2 Year RS1 RS0 Control Reg.
MCP79410/MCP79411/MCP79412 5.0 TIME AND DATE REGISTERS The MCP7941X Serial Real-Time Clock/Calendar uses a low-power external 32.768 kHz crystal to maintain the time and date in a system. week. The calendar adjusts automatically for months with less than 31 days and also calculates the leap year until 2099. The Real-Time Clock using an external oscillator tracks the time and date with separate registers for hours, minutes, seconds.
MCP79410/MCP79411/MCP79412 REGISTER 5-3: HOUR 0X02 U-0 R/W-0 R/W-0 R/W-0 R/W-0 — 12/24 10 Hour AM/PM 10 Hour Hour bit 7 bit 6 bit 5 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear bit 7 Unimplemented: Read as ‘0’ bit 6 12/24: 12 or 24 Hour Time Format 0 = 24-hour format 1 = 12-hour format bit 5 10 HOUR, AM/PM “X” = Bit is unknown 24-Hour format. This is the Ten’s Hour.
MCP79410/MCP79411/MCP79412 REGISTER 5-4: DAY 0X03 U-0 U-0 R-0 R/W-0 R/W-0 — — OSCON VBAT VBATEN bit 7 bit 6 bit 5 bit 4 bit 3 R/W-1 Day bit 2 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7-6 Unimplemented: Read as ‘0’ bit 5 OSCON: Oscillator Status bit Not used in timekeeping (See Section 8.
MCP79410/MCP79411/MCP79412 REGISTER 5-5: U-0 DATE 0X04 U-0 — — bit 7 bit 6 R/W-0 R/W-1 10 Date bit 5 Date bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear bit 7-6 Unimplemented: Read as ‘0’ bit 5-4 10 DATE<1:0>: Binary-Coded Decimal Value of Dates’s Tens Digit Contains a value from 0 to 3 bit 3-0 DATE<3:0>: Binary-Coded Decimal Value of Dates’s Ones Digit Contains a value from 0 to 9 R
MCP79410/MCP79411/MCP79412 6.0 CONTROL REGISTER The Control register is used to enable additional features of the RTCC, such as Alarms and MFP square wave divider. This register also contains bits that can be used to toggle the MFP pin and also allow the RTCC to be driven by an external CMOS 32.768 kHz clock. REGISTER 6-1: .
MCP79410/MCP79411/MCP79412 7.0 ALARM REGISTERS time, the alarm is activated and an interrupt can be generated. Using the alarm feature will allow the system to offload the task to checking for a specific time to the RTCC. The MCP7941X family feature two independent alarms. The registers associated with the alarms are located at 0Ah-16h in the RTCC memory map.
MCP79410/MCP79411/MCP79412 REGISTER 7-2: ALARM X MINUTES (0X0B/0X12) U-0 R/W-0 R/W-0 — 10 Minutes Minutes bit 7 bit 6 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7 Unimplemented: Read as ‘0’ bit 6-4 10 MINUTES<2:0>: Binary-Coded Decimal Value of Minute’s Tens Digit Contains a value from 0 to 5 bit 3-0 MINUTES<3:0>: Binary-Coded Decimal Value of Minute’s On
MCP79410/MCP79411/MCP79412 REGISTER 7-4: ALARM X DAY (0X0D/0X14) R/W-0 R/W-1 ALMxPOL R/W-0 ALMxC2 ALMxC1 R/W-0 ALMxC0 ALMxIF Day bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7 ALMxPOL: The Asserted Level of the Alarm (1 = High, 0 = Low) bit 6-4 ALMxC<2:0>: Alarm X Configuration bits Sets the condition on what the alarm will trigger
MCP79410/MCP79411/MCP79412 REGISTER 7-6: ALARM X MONTH (0X0F/0X16) U-0 U-0 U-0 R/W-0 R/W-1 — — — 10 Month Month bit 7 bit 6 bit 5 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7-5 Unimplemented: Read as ‘0’ bit 4 10 MONTH: Binary-Coded Decimal Value of Month’s Tens Digit Contains a value of 0 or 1 bit 3-0 MONTH<3:0>: Binary-Coded Decimal Value of Month
MCP79410/MCP79411/MCP79412 8.0 SPECIAL FEATURES 8.1 Oscillator Failure Status The MCP7941X family of devices support an on-board oscillator failure flag. In register 0x03 (Day Register – shown below), the OSCON (bit 5) provides a way to observe the current status of the oscillator. The state of the bit indicates the oscillator status. Figure 8-1 shows the operation.
MCP79410/MCP79411/MCP79412 8.2 Unique ID to provide a unique IEEE EUI-48 or EUI-64 value. In addition, customer-provided codes can also be programmed. Please contact your Microchip sales channel for more information on custom programming. The MCP7941X features an additional 64-bit unique ID area. This is separate and in addition to the 1K of onboard EEPROM. The unique ID locations are always readable. The unique ID is located at addresses 0xF0 through 0xF7 using the EEPROM I2C address.
MCP79410/MCP79411/MCP79412 FIGURE 8-3: ID UNLOCK FLOWCHART 8.2.1 UNLOCK SEQUENCE 2 The I C bus sequence to unlock the unique ID locations is show in Figure 8-4. This example shows all eight locations being written, any location may be written individually. Start ID Locked Write 0x55 to SRAM 0x09 Stop Write 0xAA to SRAM 0x09 Stop Write Data to Unique ID Location NO All Data Written YES Finish ID Locked 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 FIGURE 8-4: UNIQUE ID UNLOCK SEQUENCE BUS ACTIVITY MASTER SDA LINE S T A R T S1 1 01111 0 SDA LINE S T A R T S T O P 0 00 01 001 01010101 P A C K S1 1 01111 0 DATA S T O P 0 00 01 001 10101010 P S T A R T SDA LINE S101 01110 CONTROL BYTE ADDRESS BYTE S T O P DATA BYTE 7 DATA BYTE 0 P 111100 00 A C K A C K BUS ACTIVITY A C K A C K A C K BUS ACTIVITY MASTER A C K ADDRESS BYTE CONTROL BYTE BUS ACTIVITY REGISTER 8-2: DATA A C K BUS ACTIVITY BU
MCP79410/MCP79411/MCP79412 8.3 Digital Trimming function of the MCP7941X. The amount by which the MCP794XX adjusts the time is determined by the value loaded into the calibration register. A value of 0x00 in the calibration register results in no time adjustment. The Calibration value is maintained during a VCC power-fail if the backup supply is enabled. Digital trimming is also performed during this time. The same calibration value is used until it is changed by the system firmware.
MCP79410/MCP79411/MCP79412 8.4 Digital Calibration Mode The MCP7941X utilizes digital trimming to correct for inaccuracies of the input clock source. However, as this internal trimming is performed on the minute rollover, a Digital Calibration mode is available. Using this mode the oscillator frequency can be directly observable. The internal timing function can be monitored using the MFP open-drain output pin by setting bit<6:0> (SQWE) and bits<2:0> (RS2, RS1, RS0) of the control register (see Section 6.
MCP79410/MCP79411/MCP79412 FIGURE 8-5: MFP FUNCTIONAL BLOCK DIAGRAM OUT ALM0POL ALM0IF 1 0 ALM1POL ALM1IF 1 0 011 010 4.096 kHz 001 1Hz 000 64Hz (Digital Cal) 1xx Postscaler X2 0 MUX 8.192 kHz 32.768 kHz X1 MFP Pin 1 VSS Oscillator RS2:0 SQWE 8.6 Battery Backed Operation The MCP7941X features an internal power switch that can power the clock and the SRAM in the event that the VCC supply is not available. The voltage applied to the VBAT pin serves as the backup supply.
MCP79410/MCP79411/MCP79412 REGISTER 8-4: DAY 0X03 U-0 U-0 R-0 R/W-0 R/W-0 — — OSCON VBAT VBATEN bit 7 bit 6 bit 5 bit 4 bit 3 R/W-1 Day bit 2 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7-6 Unimplemented: Read as ‘0’ bit 5 OSCON: Oscillator Status bit Not Used in this section. bit 4 VBAT: External Battery Switched Flag bit Not Used in this section.
MCP79410/MCP79411/MCP79412 8.6.1 POWER-DOWN TIME-STAMP REGISTERS The MCP7941X family of RTCC devices feature a power-fail time-stamp feature. This feature will store the time at which VCC crosses the VTRIP voltage and is shown in Figure 8-6. To use this feature, a VBAT supply must be present and the oscillator must also be running. The month through minutes are saved.
MCP79410/MCP79411/MCP79412 REGISTER 8-5: MINUTES 0X18 U-0 R/W-0 R/W-0 — 10 Minutes Minutes bit 7 bit 6 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear “X” = Bit is unknown bit 7 Unimplemented: Read as ‘0’ bit 6-4 10MINUTES<2:0>: Binary-Coded Decimal Value of Minute’s Tens Digit Contains a value from 0 to 5 bit 3-0 MINUTES<3:0>: Binary-Coded Decimal Value of Minute’s Ones Digit Contain
MCP79410/MCP79411/MCP79412 REGISTER 8-7: DATE 0X1A U-0 U-0 R/W-0 R/W-0 — — 10 Date Date bit 7 bit 6 bit 5 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear bit 7-6 Unimplemented: Read as ‘0’ bit 5-4 10 DATE<1:0>: Binary-Coded Decimal Value of Date’s Tens Digit Contains a value from 0 to 3 bit 3-0 DATE<3:0>: Binary-Coded Decimal Value of Date’s Ones Digit Contains a value from 0 to 9
MCP79410/MCP79411/MCP79412 8.6.2 POWER-UP TIME-STAMP REGISTERS Note: It is strongly recommended that the time saver function only be used when the oscillator is running. This will ensure accurate functionality.
MCP79410/MCP79411/MCP79412 REGISTER 8-11: DATE 0X1E U-0 U-0 R/W-0 R/W-0 — — 10 Date Date bit 7 bit 6 bit 5 bit 4 bit 3 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set “0” = Bit is clear bit 7-6 Unimplemented: Read as ‘0’ bit 5-4 10 DATE<1:0>: Binary-Coded Decimal Value of Date’s Tens Digit Contains a value from 0 to 3 bit 3-0 DATE<3:0>: Binary-Coded Decimal Value of Date’s Ones Digit Contains a value from 0 to 9
MCP79410/MCP79411/MCP79412 9.0 I2C BUS CHARACTERISTICS 9.1.1.4 9.1 I2C Interface The state of the data line represents valid data when, after a Start condition, the data line is stable for the duration of the high period of the clock signal. The MCP7941X 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 receiver.
MCP79410/MCP79411/MCP79412 FIGURE 9-2: ACKNOWLEDGE TIMING Acknowledge Bit 1 SCL 2 3 SDA 4 5 6 7 8 9 1 DEVICE ADDRESSING AND OPERATION A control byte is the first byte received following the Start condition from the master device (Figure 9-2). The control byte consists of a control code; for the MCP7941X this is set as ‘1010111X’ for read (0xAF) and write (0xAE) operations for the EEPROM.
MCP79410/MCP79411/MCP79412 9.1.3 ACKNOWLEDGE POLLING Since the device will not acknowledge an EEPROM command during an EEPROM write cycle, this can be used to determine when the cycle is complete. This feature can be used to maximize bus throughput. Once the Stop condition for a Write command has been issued from the master, the device initiates the internally timed write cycle. ACK polling can be initiated immediately.
MCP79410/MCP79411/MCP79412 10.0 ON-BOARD MEMORY The MCP7941X has both on-board EEPROM memory and battery-backed SRAM. The SRAM is arranged as 64 bytes and is retained when the VCC supply is removed, provided the VBAT supply is present and enabled. The EEPROM is organized as 128 x 8 bytes. The EEPROM is nonvolatile memory and does not require the VBAT supply for retention. 10.
MCP79410/MCP79411/MCP79412 10.2 EEPROM The MCP794XX features 1Kbits of internal high endurance EEPROM. This EEPROM block features an 8-byte page. 10.2.1 TABLE 10-1: BLOCK PROTECTION The EEPROM does not support a hardware write protection pin, however, software block protection is available to the user and is configured using the STATUS register. 10.2.
MCP79410/MCP79411/MCP79412 10.2.3 EEPROM 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 receiver that a byte with a word address will follow after it has generated an Acknowledge bit during the ninth clock cycle. Therefore, the next byte transmitted by the master is the word address and will be written into the Address Pointer of the MCP7941X.
MCP79410/MCP79411/MCP79412 FIGURE 10-3: EE BYTE WRITE BUS ACTIVITY MASTER SDA LINE S T A R T CONTROL BYTE S1 0 10111 0 P A C K A C K EE PAGE WRITE BUS ACTIVITY MASTER S T A R T SDA LINE S10 1 01110 BUS ACTIVITY DS20002266E-page 40 S T O P DATA 0 A C K BUS ACTIVITY FIGURE 10-4: ADDRESS BYTE CONTROL BYTE ADDRESS BYTE S T O P DATA BYTE 7 DATA BYTE 0 0 A C K P A C K A C K A C K 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 10.2.5 READ OPERATION 10.2.5.2 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 to one. There are three basic types of read operations: current address read, random read, and sequential read. 10.2.5.1 Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, first the word address must be set.
MCP79410/MCP79411/MCP79412 11.0 PACKAGING INFORMATION 11.1 Package Marking Information 8-Lead SOIC (3.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20002266E-page 44 2010-2013 Microchip Technology Inc.
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MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20002266E-page 48 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20002266E-page 50 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS20002266E-page 52 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 & + , ) - . /0 0 12 ! "'+, % ! " # $ % & "' " " ( $ ) % *++&&& ! !+ $ 2010-2013 Microchip Technology Inc.
MCP79410/MCP79411/MCP79412 APPENDIX A: REVISION HISTORY Revision A (10/2010) Original release of this document. APPENDIX B: DEVICE ERRATA Devices with silicon revision prior to A4 (date code prior to 11/10) have an errata where the AM/PM bit (Bit 5 in register 02h) may be flipped if the oscillator is stopped. This is coincident with the OSCON bit getting cleared.
MCP7941X THE MICROCHIP WEB SITE CUSTOMER SUPPORT 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.
MCP7941X 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. Please list the following information, and use this outline to provide us with your comments about this document.
MCP7941X PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. Not every possible ordering combination is listed below. PART NO. Device Device: X /XX Temperature Package Range MCP79410 = MCP79410T = MCP79411 = MCP79411T = MCP79412 = MCP79412T = Temperature Range: I Package: SN ST = = = MS = MNY(1) = 1.8V - 5.5V I2C™ Serial RTCC 1.8V - 5.5V I2C Serial RTCC (Tape and Reel) 1.8V - 5.
MCP7941X NOTES: DS20002266E-page 58 2010-2013 Microchip Technology Inc.
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 of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
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