MCP795W20

The MCP795W20 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a blank unique ID in a locked section of EEPROM. The ID is blank in this device, but can also be ordered with a 48-bit or 64-bit MAC Address. By adding a watchdog timer and two programmable event detect inputs, lower power and more system robustness can be achieved by performing these functions in the RTCC, thus allowing the MCU to sleep for longer periods of time.

Features
  • Low Power Operation VCC Min = 1.8V Icc < 1 µA Typical Standby Current
  • VCC Min = 1.8V
  • Icc < 1 µA
  • Typical Standby Current
  • Low Backup Power VBAT Min = 1.3V Ibat < 700nA Typical Timekeeping & SRAM Retention Current
  • VBAT Min = 1.3V
  • Ibat < 700nA
  • Typical Timekeeping & SRAM Retention Current
  • Automatic Battery Switchover with Timestamp VCC to VBAT (VCC Lost) VBAT to VCC (VCC Restored)
  • VCC to VBAT (VCC Lost)
  • VBAT to VCC (VCC Restored)
  • Dual configurable alarms with a 0.01 sec count on one alarm IRQ (VCC or VBAT) WDO (VCC)
  • IRQ (VCC or VBAT)
  • WDO (VCC)
  • Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz
  • Digital Trimming Range from -255 to + 255 ppm in 1 ppm steps Adjusts up to 22 seconds/day
  • Adjusts up to 22 seconds/day
  • Watchdog Timer - Dual Retriggers SPI Bus or EVHS digital input
  • SPI Bus or EVHS digital input
  • Dual Configurable Event Detects High speed with programmable pulse count (EVHS) Low speed with programmable debounce delay (EVLS)
  • High speed with programmable pulse count (EVHS)
  • Low speed with programmable debounce delay (EVLS)
  • EEPROM has 8 Bytes/Page with Block Sector write protection Protect: None, 1/4, 1/2 or all of array
  • Protect: None, 1/4, 1/2 or all of array
  • Factory standard MAC address programming or custom ID available
Parameter
Parameter Name Value Value
Max Communications Speed 10 MHz 10 MHz
Pin Count 14 14
Minimum Clock Count (seconds) 0.01 sec 0.01 sec
Battery-backed SRAM (Bytes) 64 64
EEPROM (Kbits) 2 2
Unique ID (bits) 128 128
Unique ID Programming Blank Blank
Temperature Range (C) -40 to +85 -40 to +85
Documents
MCP795W1X/MCP795W2X SPI RTCC with Enhanced Features and Battery SwitchoverData Sheets06/21/2016854KB
MCP795WXX Family Silicon Errata and Data Sheet ClarificationErrata12/15/201570KB
AN1365 - Recommended Usage of Microchip Serial RTCC DevicesAppNote03/28/2013267KB
AN1412 - How to Calculate UNIX Time Using a PIC18 Microcontroller and the MCP795W20 SPI RTCCAppNote01/31/2012318KB
AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410AppNote11/07/2011479KB
AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar DevicesAppNote09/16/2013397KB
AN1564 - Configuring and Using the Event Detection Module of MCP795WXX RTCCsAppNote09/16/2013305KB
AN1565 - Configuring and Using the WDT Module of MCP795WXX Real-Time Clock/CalendarsAppNote09/16/2013290KB
AN1950 - Configuring and Using the MCP795WXX SPI RTCC for Basic Timekeeping, Based on a PIC18AppNote06/08/2015146KB
AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMsAppNote12/01/2015161KB
AN2140 - Configuring and Using the Alarm Module of the MCP795WXX Real-Time Clock/CalendarsAppNote05/11/2016154KB
TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCsAppNote08/11/201475KB
I2C & SPI Real-Time Clock/Calendar Sell SheetBrochures07/21/2014703KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MCP795W20-I/SL14SOIC-40C to +85CTUBE1.601.481.401.321.28
MCP795W20-I/ST14TSSOP-40C to +85CTUBE1.641.521.441.351.31
MCP795W20T-I/SL14SOIC-40C to +85CT/R1.601.481.401.321.28
MCP795W20T-I/ST14TSSOP-40C to +85CT/R1.641.521.441.351.31
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RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MCP795W20T-I/ST0.0600000.24680014TSSOP4.4mmMatte Tine3
MCP795W20-I/ST0.0600000.12500014TSSOP4.4mmMatte Tine3
MCP795W20-I/SL0.1432000.28070214SOIC.150In(3.90mm)Matte Tine3
MCP795W20T-I/SL0.1432000.32500014SOIC.150In(3.90mm)Matte Tine3
MCP795W1X/MCP795W2X SPI RTCC with Enhanced Features and Battery Switchover MCP795W22
MCP795WXX Family Silicon Errata and Data Sheet Clarification MCP795W22
AN1365 MCP795W22
AN1412 MCP795W20
AN1413 MCP795W22
AN1413 Source Code MCP795W22
AN1519 MCP795W22
AN1564 MCP795W22
AN1564 Source Code MCP795W22
AN1565 MCP795W21
AN1565 Source Code MCP795W21
AN1950 MCP795W21
AN1950 Source Code MCP795W21
AN2027 MCP795W22
AN2140 MCP795W22
AN2140 Source Code MCP795W22
TB3116 MCP795W22
I2C & SPI Real-Time Clock/Calendar Sell Sheet MCP795W22