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 Switchover | Data Sheets | 06/21/2016 | 854KB | |
|
| MCP795WXX Family Silicon Errata and Data Sheet Clarification | Errata | 12/15/2015 | 70KB | |
|
| AN1365 - Recommended Usage of Microchip Serial RTCC Devices | AppNote | 03/28/2013 | 267KB |  |
| AN1412 - How to Calculate UNIX Time Using a PIC18 Microcontroller and the MCP795W20 SPI RTCC | AppNote | 01/31/2012 | 318KB | |
| AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410 | AppNote | 11/07/2011 | 479KB |  |
| AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar Devices | AppNote | 09/16/2013 | 397KB | |
| AN1564 - Configuring and Using the Event Detection Module of MCP795WXX RTCCs | AppNote | 09/16/2013 | 305KB | |
| AN1565 - Configuring and Using the WDT Module of MCP795WXX Real-Time Clock/Calendars | AppNote | 09/16/2013 | 290KB | |
| AN1950 - Configuring and Using the MCP795WXX SPI RTCC for Basic Timekeeping, Based on a PIC18 | AppNote | 06/08/2015 | 146KB | |
| AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMs | AppNote | 12/01/2015 | 161KB | |
| AN2140 - Configuring and Using the Alarm Module of the MCP795WXX Real-Time Clock/Calendars | AppNote | 05/11/2016 | 154KB | |
| TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCs | AppNote | 08/11/2014 | 75KB | |
|
| I2C & SPI Real-Time Clock/Calendar Sell Sheet | Brochures | 07/21/2014 | 703KB | |
Ordering Information
| Part Number | Leads | Package Type | Temp Range | Packing | 1+ | 26+ | 100+ | 1000+ | 5000+ |
|---|
| MCP795W20-I/SL | 14 | SOIC | -40C to +85C | TUBE | 1.60 | 1.48 | 1.40 | 1.32 | 1.28 |
| MCP795W20-I/ST | 14 | TSSOP | -40C to +85C | TUBE | 1.64 | 1.52 | 1.44 | 1.35 | 1.31 |
| MCP795W20T-I/SL | 14 | SOIC | -40C to +85C | T/R | 1.60 | 1.48 | 1.40 | 1.32 | 1.28 |
| MCP795W20T-I/ST | 14 | TSSOP | -40C to +85C | T/R | 1.64 | 1.52 | 1.44 | 1.35 | 1.31 |
Similar Devices
RoHS Information
| PartNumber | DeviceWeight | ShippingWeight | LeadCount | PackageType | PackageWidth | SolderComposition | JEDECIndicator | RoHS | ChinaEFUP |
|---|
| MCP795W20T-I/ST | 0.060000 | 0.246800 | 14 | TSSOP | 4.4mm | Matte Tin | e3 |  |  |
| MCP795W20-I/ST | 0.060000 | 0.125000 | 14 | TSSOP | 4.4mm | Matte Tin | e3 | | |
| MCP795W20-I/SL | 0.143200 | 0.280702 | 14 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| MCP795W20T-I/SL | 0.143200 | 0.325000 | 14 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
