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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP795W10 Datasheet

Battery-Backed SPI Real-Time Clock/Calendar

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MCP795W1X/MCP795W2X
Battery-Backed SPI Real-Time Clock/Calendar with Enhanced Features
Device Selection Table
Part Number
EEPROM
(Kbits)
MCP795W10
1
MCP795W20
2
MCP795W11
1
MCP795W21
2
MCP795W12
1
MCP795W22
2
Protected
EEPROM
Blank
Blank
EUI-48
EUI-48
EUI-64
EUI-64
Timekeeping Features
• Real-Time Clock/Calendar (RTCC):
- Hours, minutes, seconds, hundredth of
seconds, day of week, date, month, year
- Leap year compensated to 2399
- 12/24-hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 ppm resolution
- ±259 ppm range
• Dual Programmable Alarms
• Clock Output Function with Selectable Frequency
• Power-Fail Timestamp:
- Time logged on switchover to and from Battery
mode
Low-Power Features
• Wide Voltage Range:
- Operating voltage range of 1.8V to 3.6V
- Backup voltage range of 1.3V to 3.6V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.0V
- Operating from VBAT: 1.0 µA at 3.0V
• Automatic Switchover to Battery Backup
Enhanced Features
• Programmable Watchdog Timer:
- Dedicated output pin
- Cleared via SPI bus or EVHS input
• Dual Configurable Event Detect Modules:
- High-Speed Digital Event Detect for program-
mable pulse count detection
- Low-Speed Event Detect for programmable
switch debouncing
2011-2018 Microchip Technology Inc.
User Memory
• 64-Byte Battery-Backed SRAM
• 1 Kbit or 2 Kbit EEPROM:
- Software write-protect
- Page write up to 8 bytes
- Endurance: 1M erase/write cycles
• 128-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48™ MAC address (MCP795WX1)
- EUI-64™ MAC address (MCP795WX2)
Operating Ranges
• SPI Serial Interface:
- SPI clock rate up to 5 MHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages
• 14-Lead SOIC and TSSOP
Package Types (not to scale)
SOIC/TSSOP
X1 1
X2 2
VBAT 3
WDO 4
IRQ 5
CS 6
VSS 7
14 VCC
13 CLKOUT
12 EVHS
11 EVLS
10 SCK
9 SI
8 SO
DS20002280E-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP795W10 Datasheet

Battery-Backed SPI Real-Time Clock/Calendar

No Preview Available !

MCP795W1X/MCP795W2X
Description
The MCP795WXX Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, hundredth of 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 MCP795WXX supports SPI
communications up to 5 MHz.
The MCP795WXX 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
backup supply when main power is lost, allowing the
device to maintain accurate time and the SRAM
contents. The times when the device switches over to
the backup supply and when primary power returns
are both logged by the power-fail timestamp.
The MCP795WXX features 128 bits of EEPROM
which is only writable after an unlock sequence,
making it ideal for storing a unique ID or other critical
information.
The MCP795WX1 and MCP795WX2 are
preprogrammed with EUI-48 and EUI-64 addresses,
respectively. Custom programming is also available.
Two event detect modules are included on the
MCP795WXX. The high-speed event detect module
will generate an interrupt after a programmable
number of pulses have been detected. The low-speed
event detect module can be used to debounce
mechanical switches and includes a selectable
debounce period.
The MCP795WXX also features an integrated
Watchdog Timer peripheral. This allows applications to
improve system robustness by moving this
functionality outside of the microcontroller.
The MCP795WXX has versatile output options. There
is a dedicated pin for outputting a selectable frequency
square wave or for use as a general purpose output.
Additionally, the alarms can be assigned to either the
Watchdog Timer interrupt output or the event detect
interrupt output.
FIGURE 1-1:
TYPICAL APPLICATION SCHEMATIC
VCC
PIC® MCU
MCLR
VCC
VCC
14
VCC
X1 1
CX1
6 CS
10
SCK
2
X2
CX2
9
SI
3
VBAT
MCP795WXX
8
SO
VBAT
4
WDO
5
IRQ
12
EVHS
EVHS
13
CLKOUT
11
EVLS
EVLS
VSS
7
2011-2018 Microchip Technology Inc.
DS20002280E-page 2


Part Number MCP795W10
Description Battery-Backed SPI Real-Time Clock/Calendar
Maker MICROCHIP
Total Page 30 Pages
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