MCP795W20-I/ST 查看數據表（PDF） - Microchip Technology

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MCP795W20-I/ST

2Kb EE 64B SRAM WD TED ID

Microchip Technology 

MCP795W1X/MCP795W2X

3V 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™

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

• 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 3.6V

- VBAT: 1.3V to 3.6V

• 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 5 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 1st, 4th,16th or 32nd 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

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/BOOT

12 EVHS

11 EVLS

10 SCK

9 SI

8 SO

Note:

MCP795WXX is used in this document as a

generic part number for the MCP795W1X,

MCP795W2X devices.

 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 1

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