MCP795W21 datasheet(1/54 Pages) MICROCHIP

部件名	MCP795W21

功能描述	3V SPI Real-Time Clock Calendar with Enhanced Features and Battery Switchover

PDF	54 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

1 / 54 page

 2011-2012 Microchip Technology Inc.

Preliminary

DS22280C-page 1

MCP795W1X/MCP795W2X

Device Selection Table

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)

Part Number

32 kHz

Boot-up

SRAM

(Bytes)

EEPROM

(Kbits)

Unique

ID

MCP795W20

No

64

2

Blank

MCP795W10

No

64

1

Blank

MCP795W21

No

64

2

EUI-48™

MCP795W11

No

64

1

EUI-48™

MCP795W22

No

64

2

EUI-64™

MCP795W12

No

64

1

EUI-64™

Note:

Watchdog Timer and Event Detects in all devices.

X1

X2

VBAT

WDO

Vcc

CLKOUT/BOOT

EVHS

EVLS

1

2

3

4

14

13

12

11

SOIC/TSSOP

IRQ

CS

VSS

SCK

SI

SO

5

6

7

10

9

8

Note:

MCP795WXX is used in this document as a

generic part number for the MCP795W1X,

MCP795W2X devices.

3V SPI Real-Time Clock Calendar with

Enhanced Features and Battery Switchover

类似零件编号 - MCP795W21

制造商	部件名	数据表	功能描述
Micro Analog systems	MCP795W21	969Kb / 54P	SPI Real-Time Clock Calendar

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类似说明 - MCP795W21

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Microchip Technology	MCP7940N	562Kb / 36P	Low-Cost I2C??Real-Time Clock/Calendar with SRAM and Battery Switchover 2011
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