ds3231时钟模块资料源码_ds3231时钟模块详细讲解资源-CSDN文库

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DS3231

源码

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DS3231

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_________________________________

概述

DS3231

是低成本、高精度

实时时钟

(RTC)

，具有集成

的温补晶体振荡器

(TCXO)

和晶体。该器件包含电池输入

端，断开主电源时仍可保持精确的计时。集成晶体振荡

器提高了器件的长期精确度，并减少了生产线的元件数

量。

DS3231

提供商用级和工业级温度范围，采用

引脚、

300mil

的

封装。

RTC

保持秒、分、时、星期、日期、月和年信息。少于

天的月份，将自动调整月末日期，包括闰年补偿。时

钟的工作格式可以是

小时或带

AM/PM

指示的

小时

格式。提供两个可编程日历闹钟和一路可编程方波输出。

地址与数据通过

双向总线串行传输。

精密的、经过温度补偿的电压基准和比较器用来监视

状态，检测电源故障、提供复位输出，并在必要时自动

切换到备用电源。另外，

RST

监视引脚可以作为手动按钮

输入以产生外部复位信号。

_________________________________

应用

服务器电表

远程信息处理系统

GPS

_________________________________

特性

♦ 0°C

至

+40°C

范围内精度为

±2ppm

♦ -40°C

至

+85°C

范围内精度为

±3.5ppm

♦

为连续计时提供备用电池输入

♦

工作温度范围

商用级：

0°C

至

+70°C

工业级：

-40°C

至

+85°C

♦

低功耗

♦

实时时钟提供秒、分、时、星期、日期、月、

年信息，并提供有效期到

2100

年的闰年补偿

♦

两个日历闹钟

♦

可编程方波输出

♦

快速

(400kHz) I

接口

♦ 3.3V

工作电压

♦

数字温度传感器输出：精度为

±3°C

♦

老化修正寄存器

♦ RST

输入

输出

DS3231

高精度、

集成

RTC/TCXO/

晶体

______________________________________________ Maxim Integrated Products 1

Rev 1; 2/05

______________________________

定购信息

PART TEMP RANGE PIN-PACKAGE

TOP

MARK

DS3231S 0°C to +70°C 16 SO DS3231S

DS3231SN -45°C to +85°C 16 SO DS3231SN

引脚配置在数据资料的最后部分给出。

购买

Maxim Integrated Products, Inc.

或其从属授权关联公司的

产品，即得到了

Philips I

的专利许可、将这些产品用于符合

Philips

定义的

标准规范的系统。

DS3231

SCL

= t

INT/SQW

32kHz

BAT

SDA

RST

GND

CPU

_______________________________________________________________

典型工作电路

本文是

Maxim

正式英文资料的译文，

Maxim

不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或

翻译错误，如需确认任何词语的准确性，请参考

Maxim

提供的英文版资料。

索取免费样品和最新版的数据资料，请访问

Maxim

的主页：

www.maxim-ic.com.cn

。

DS3231

高精度、

集成

RTC/TCXO/

晶体

2 _____________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED DC OPERATING CONDITIONS

= T

MIN

to T

MAX

, unless otherwise noted.) (Notes 1, 2)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Voltage Range on V

, V

BAT

, 32kHz, SCL, SDA, RST,

INT/SQW Relative to Ground.............................-0.3V to +6.0V

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+125°C

Storage Temperature Range ...............................-40°C to +85°C

Lead Temperature

(Soldering, 10s).....................................................+260°C/10s

Soldering Temperature....................................See the Handling,

PC Board Layout, and Assembly section.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

2.3 3.3 5.5 V

Supply Voltage

BAT

2.3 3.0 5.5 V

Logic 1 Input SDA, SCL V

0.7 x

0.3

Logic 0 Input SDA, SCL V

-0.3

+0.3 x

Pullup Voltage

(SDA, SCL, 32kHz, INT/SQW)

= 0V 5.5V V

ELECTRICAL CHARACTERISTICS

= 2.3V to 5.5V, V

> V

BAT

, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Typical values are at V

= 3.3V, V

BAT

= 3.0V, and

= +25°C, unless otherwise noted.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 3.63V 200

Active Supply Current I

CCA

(Notes 3, 4)

= 5.5V 300

µA

= 3.63V 110

Standby Supply Current I

CCS

C bus inactive, 32kHz

output on, SQW output off

(Note 4)

= 5.5V 170

µA

= 3.63V 575

Temperature Conversion Current I

CCSCONV

C bus inactive, 32kHz

output on, SQW output off

= 5.5V 650

µA

Power-Fail Voltage V

2.35 2.575 2.70 V

Logic 0 Output, 32kHz, INT/SQW,

SDA

= 3mA 0.4 V

Logic 0 Output, RST V

= 1mA 0.4 V

Output Leakage Current 32kHz,

INT/SQW, SDA

Output high impedance -1 0 +1 µA

Input Leakage SCL I

-1 +1 µA

RST Pin I/O Leakage I

RST high impedance (Note 5) -200 +10 µA

BAT

Leakage Current

Active)

BATLKG

25 100 nA

DS3231

高精度、

集成

RTC/TCXO/

晶体

_____________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= 2.3V to 5.5V, V

> V

BAT

, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Typical values are at V

= 3.3V, V

BAT

= 3.0V, and

= +25°C, unless otherwise noted.) (Notes 1, 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Frequency f

OUT

= 3.3V or V

BAT

= 3.3V 32.768 kHz

0°C to +40°C ±2

Frequency Stability vs.

Temperature (Commercial)

∆f/f

OUT

= 3.3V or

BAT

= 3.3V

>40°C to +70°C ±3.5

ppm

-40°C to <0°C ±3.5

0°C to +40°C ±2

Frequency Stability vs.

Temperature (Industrial)

∆f/f

OUT

= 3.3V or

BAT

= 3.3V

>40°C to +85°C ±3.5

ppm

Frequency Stability vs. Voltage ∆f/V 1 ppm/V

-40°C 0.7

+25°C 0.1

+70°C 0.4

Trim Register Frequency

Sensitivity per LSB

∆f/LSB Specified at:

+85°C 0.8

ppm

Temperature Accuracy Temp V

= 3.3V or V

BAT

= 3.3V -3 +3 °C

ELECTRICAL CHARACTERISTICS

= 0V, V

BAT

= 2.3V to 5.5V, T

= T

MIN

to T

MAX

, unless otherw.ise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BAT

= 3.63V 70

Active Battery Current I

BATA

EOSC = 0, BBSQW = 0,

SCL = 400kHz (Note 4)

BAT

= 5.5V 150

µA

BAT

= 3.63V 0.84 3.0

Timekeeping Battery Current I

BATT

EOSC = 0, BBSQW = 0,

EN32kHz = 1,

SCL = SDA = 0V or

S C L = S D A = V

BAT

( Note 4)

BAT

= 5.5V 1.0 3.5

µA

BAT

= 3.63V 575

Temperature Conversion Current I

BATTC

EOSC = 0, BBSQW = 0,

SCL = SDA = 0V or

SCL = SDA = V

BAT

= 5.5V 650

µA

Data-Retention Current I

BATTDR

EOSC = 1, SCL = SDA = 0V, +25°C 100 nA

DS3231

高精度、

集成

RTC/TCXO/

晶体

4 _____________________________________________________________________

AC ELECTRICAL CHARACTERISTICS

= V

CC(MIN)

to V

CC(MAX)

or V

BAT

= V

BAT(MIN)

to V

BAT(MAX)

, V

BAT

> V

, T

= T

MIN

to T

MAX

, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Fast mode 100 400

SCL Clock Frequency f

SCL

Standard mode 0 100

kHz

Fast mode 1.3

Bus Free Time Between STOP

and START Conditions

BUF

Standard mode 4.7

µs

Fast mode 0.6

Hold Time (Repeated) START

Condition (Note 6)

HD:STA

Standard mode 4.0

µs

Fast mode 1.3

Low Period of SCL Clock t

LOW

Standard mode 4.7

µs

Fast mode 0.6

High Period of SCL Clock t

HIGH

Standard mode 4.0

µs

Fast mode 0 0.9

Data Hold Time (Notes 7, 8) t

HD:DAT

Standard mode 0 0.9

µs

Fast mode 100

Data Setup Time (Note 9) t

SU:DAT

Standard mode 250

Fast mode 0.6

Start Setup Time t

SU:STA

Standard mode 4.7

µs

Fast mode 300

Rise Time of Both SDA and SCL

Signals (Note 10)

Standard mode

20 +

0.1C

B 1000

Fast mode 300

Fall Time of Both SDA and SCL

Signals (Note 10)

Standard mode

20 +

0.1C

B 300

Fast mode 0.6

Setup Time for STOP Condition t

SU:STO

Standard mode 4.7

µs

Capacitive Load for Each Bus

Line (Note 10)

400 pF

Capacitance for SDA, SCL C

I/O

10 pF

Pulse Width of Spikes That Must

Be Suppressed by the Input Filter

30 ns

Pushbutton Debounce PB

250 ms

Reset Active Time t

RST

250 ms

Oscillator Stop Flag (OSF) Delay t

OSF

(Note 11) 100 ms

Temperature Conversion Time t

CONV

125 200 ms

POWER-SWITCH CHARACTERISTICS

= T

MIN

to T

MAX

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Fall Time; V

PF(MAX)

PF(MIN)

VCCF

300 µs

Rise Time; V

PF(MIN)

PF(MAX)

VCCR

0µs

Recovery at Power-Up t

REC

(Note 12) 250 300 ms

DS3231

高精度、

集成

RTC/TCXO/

晶体

_____________________________________________________________________ 5

___________________________________________________________________

按钮复位时序

RST

___________________________________________________________________

电源开关时序

VCCF

VCCR

REC

PF(MAX)

PF(MIN)

RST

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