MCP795WXX Datasheet, PDF (1/54 Pages) Micro Analog systems – SPI Real-Time Clock Calendar

MCP795WXX/MCP795BXX
SPI Real-Time Clock Calendar with
Enhanced Features and Battery Switchover
Device Selection Table
Part Number
32 kHz
Boot-up
SRAM EEPROM Unique
(Bytes) (Kbits)
ID
MCP795W20
No
64
2
Blank
MCP795W10
No
64
MCP795W21
No
64
MCP795W11
No
64
MCP795W22
No
64
MCP795W12
No
64
1
Blank
2
EUI-48^™
1
EUI-48^™
2
EUI-64^™
1
EUI-64^™
MCP795B20
Yes
64
2
Blank
MCP795B10
Yes
64
MCP795B21
Yes
64
MCP795B11
Yes
64
MCP795B22
Yes
64
MCP795B12
Yes
64
1
Blank
2
EUI-48^™
1
EUI-48^™
2
EUI-64^™
1
EUI-64^™
Note: Watchdog Timer and Event Detects in all devices.
Timekeeping Features:
• Real-Time Clock/Calendar:
- Hours, Minutes, Seconds, Hundredth of
Seconds, Day of Week, Month, Year, Leap
Year
• Crystal Oscillator requires External 32,768 kHz
Tuning Fork Crystal and Load Capacitors.
• Clock Out Function:
- 1Hz, 4.096 kHz, 8.192 kHz, 32.768 kHz
• 32 kHz Boot-up Clock at Power-up (MCP795BXX)
• 2 Programmable Alarms – Supports IRQ or WDO
• Programmable open drain output – Alarm or
Interrupt
• On-Chip Digital Trimming/Calibration:
- +/- 255 PPM range in 1 PPM steps
• Power-Fail Time-Stamp @ Battery Switchover:
- Logs time when VCC fails and VCC is restored
Low-Power Features:
• Wide Operating Voltage:
- VCC: 1.8V to 5.5V
- VBAT: 1.3V to 5.5V
• Low Operating Current:
- VCC Standby Current < 1uA @ 3V
- VBAT Timekeeping Current: <700nA @ 1.8V
• Automatic Battery Switchover from VCC to VBAT:
- Backup power for timekeeping and SRAM
retention
User Memory:
• 64-Byte Battery-Backed SRAM
• 2 Kbit and 1 Kbit EEPROM Memory:
- Software block write-protect (¼, ½, or entire
array)
- Write Page mode (up to 8 bytes)
- Endurance: 1M erase/write cycles
• 128-Bit Unique ID in Protected Area of EEPROM:
- Available blank or preprogrammed
- EUI-48™ or EUI-64™ MAC address
- Unlock sequence for user programming
Enhanced Features:
• SPI Clock Speed up to 10 MHz
• Programmable Watchdog Timer:
- Dedicated watchdog output pin
- Dual retrigger using SPI bus or EVHS digital
input
• Dual Configurable Event Detect Inputs:
- High-Speed Digital Event Detect (EVHS) with
pulse count for 1^st, 4^th,16^th or 32^nd event
- Low-Speed Event Detect (EVLS) with
programmable debounce delays of 31 msec
and 500 msec
- Edge triggered (rising or falling)
- Operates from VCC or VBAT
• Operating Temperature Ranges:
- Industrial (I Temp): -40°C to +85°C.
• Packages include 14-Lead SOIC and TSSOP
SOIC/TSSOP
X1 1
X2 2
VBAT 3
WDO 4
IRQ 5
CS 6
VSS 7
14 Vcc
13 CLKOUT/BOOT
12 EVHS
11 EVLS
10 SCK
9 SI
8 SO
Note:
MCP795XXX is used in this document as a
generic part number for the MCP795WXX,
MCP795BXX devices.
 2011 Microchip Technology Inc.
Preliminary
DS22280A-page 1