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MCP7940N

更新时间： 2024-11-21 11:04:27

品牌	Logo	应用领域
美国微芯 - MICROCHIP		电池静态存储器时钟
页数	文件大小	规格书
36页	552K
描述
Low-Cost I2C? Real-Time Clock/Calendar with SRAM and Battery Switchover

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MCP7940N 数据手册

MCP7940N

Low-Cost I²C™ Real-Time Clock/Calendar

with SRAM and Battery Switchover

Device Selection Table

Description:

SRAM

(Bytes)

The MCP7940N series of low-power Real-Time Clocks

(RTC) uses digital timing compensation for an accurate

clock/calendar, a programmable output control for

versatility, a power sense circuit that automatically

switches to the backup supply. Using a low-cost 32.768

kHz crystal, it tracks time using several internal regis-

ters. For communication, the MCP7940N uses the

I²C™ bus.

Part Number

MCP7940N

Features:

• Real-Time Clock/Calendar (RTCC), Battery

Backed:

- Hours, Minutes, Seconds, Day of Week, Day,

Month and Year

The clock/calendar automatically adjusts for months

with fewer than 31 days, including corrections for

leap years. The clock operates in either the 24-hour

or 12-hour format with an AM/PM indicator and

settable alarm(s) to the second, minute, hour, day of

the week, date or month. Using the programmable

CLKOUT, frequencies of 32.768, 8.192 and 4.096

kHz and 1 Hz can be generated from the external

crystal.

- Dual alarm with single output

• On-Chip Digital Trimming/Calibration:

- Range -127 to +127 ppm

- Resolution 1 ppm

• Programmable Open-Drain Output Control:

- CLKOUT with 4 selectable frequencies

- Alarm output

The device is fully accessible through the serial

interface while VCC is between 1.8V and 5.5V, but can

operate down to 1.3V for timekeeping and SRAM

retention only.

• 64 Bytes SRAM, Battery Backed

• Automatic VCC Switchover to VBAT Backup

Supply

• Power-Fail Time-Stamp for Battery Switchover

• Low-Power CMOS Technology:

The RTC series of devices are available in the standard

8-lead SOIC, TSSOP, MSOP and 2x3 TDFN packages.

- Dynamic Current: 400 A max read

- Battery Backup Current: <700nA @ 1.8V

• 100 kHz and 400 kHz Compatibility

• ESD Protection >4,000V

Package Types

MSOP

VCC

• Packages include 8-Lead SOIC, TSSOP, 2x3

TDFN, MSOP

V_BAT

VSS

MFP

SCL

SDA

TDFN

• Pb-Free and RoHS Compliant

• Temperature Ranges:

VCC

MFP

SCL

SDA

- Industrial (I): -40°C to +85°C

VBAT

SOIC, TSSOP

VSS

VCC

V_BAT

VSS

MFP

SCL

SDA

 2011 Microchip Technology Inc.

DS25010A-page 1

12 3 4 5 6 7...36

中文翻译

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与MCP7940N相关器件

型号	品牌	获取价格	描述	数据表
MCP7940N_13	MICROCHIP	获取价格	Low-Cost I2Câ¢ Real-Time Clock/Calendar with
MCP7940N-E/MNY	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-E/MS	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-E/SN	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-E/ST	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-I/MNY	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-I/MS	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-I/SN	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940N-I/ST	MICROCHIP	获取价格	Low-Cost I2C Real-Time Clock/Calendar with SRAM and Battery Switchover
MCP7940NT	MICROCHIP	获取价格	Low-Cost I2C? Real-Time Clock/Calendar with SRAM and Battery Switchover

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