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MCP79411 Datasheet(PDF) 1 Page - Microchip Technology |
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MCP79411 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 60 page  2010-2013 Microchip Technology Inc. DS20002266E-page 1 MCP79410/MCP79411/MCP79412 Device Selection Table Timekeeping Features: • Real-Time Clock/Calendar (RTCC): - Hours, Minutes, Seconds, Day of Week, Day, Month, Year - Leap year compensated to 2099 - 12/24 hour modes • Oscillator for 32,768 kHz Crystals: - Optimized for 6-9 pF crystals • On-Chip Digital Trimming/Calibration: - 1 PPM resolution - +/- 129 PPM • Dual Programmable Alarms • Multifunction Output Pin: - Clock out with selectable frequency - Alarm output - Programmable operation • Power-Fail Time-Stamp: - Time logged on Power-up/down Low-Power Features: • Wide Operating Voltage: -VCC: 1.8V to 5.5V -VBAT: 1.3V to 5.5V • Low Typical Operating Current: -VCC Standby: 5 µA -VBAT Standby: 700 nA • Automatic Battery Switchover User Memory: • 64-byte Battery-Backed SRAM • 1 Kbit EEPROM Memory: - Software write-protect - Page write up to 8 bytes - Endurance: 1M Erase/Write cycles • 64-bit Protected EEPROM Memory Area: - Robust write unlock sequence -EUI-48™ MAC address -EUI-64™ MAC address -Custom specified Operating Ranges: • 2-Wire Serial Interface, I2C™ Compatible -I2C Clock Rate up to 400 kHz • Temperature Range: - Industrial (I): -40°C to +85°C Packages: • 8-Lead SOIC, MSOP, TSSOP and 2x3 TDFN General Description: The MCP7941X Real-Time Clock/Calendar (RTCC) tracks time using internal counters for hours, minutes, seconds, days, months, years and day of week. Alarms can be configured on all counters up to and including months. For usage and configuration, the MCP7941X supports I2C communications up to 400 kHz. The open collector, multifunctional output can be configured to assert on an alarm match, on modification of an internal register or to output a selectable frequency square wave. The MCP7941X is designed to operate using a 32,768 kHz tuning fork crystal with external crystal load capacitors. On-chip digital trimming can be used to adjust for frequency variance caused by crystal tolerance and temperature. SRAM and timekeeping circuitry are powered from the back-up supply allowing the device to maintain accurate time and the SRAM contents when the main supply is unavailable. The time when the device switches over to the back-up supply and returns to main power is logged by the power-fail time-stamp. The MCP7941X features 1 Kbit of internal nonvolatile EEPROM with software write-protectable regions. There is an additional 64 bits of nonvolatile memory, referred to as the unique ID space, which is only writable after an unlock sequence. The MCP7941X device is available with the unique ID space pre- programmed with EUI-48 or EUI-64 unique MAC ID’s or unprogrammed. Package Types Part Number Unique ID MCP79410 Unprogrammed MCP79411 EUI-48™ MCP79412 EUI-64™ SOIC, TSSOP, MSOP X1 X2 VBAT VSS 1 2 3 4 8 7 6 5 VCC MFP SCL SDA TDFN X1 X2 VBAT VSS MFP SCL SDA VCC 8 7 6 5 1 2 3 4 Battery-Backed I2C™ Real-Time Clock/Calendar with EEPROM and Unique ID |
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