MAXIM DS3231M Technical data

19-5312; Rev 0; 6/10

DS3231M

含电池输入端，断开主电源时仍可保持精确计时。集成微机
电系统
的元件数量。
器件封装。

RTC

的月份，将自动调整月末的日期，包括闰年修正。时钟格式
可以是
设置的日历闹钟和一个
总线串行传输。精密的、经过温度补偿的电压基准和比较器
电路用来监视
在必要时自动切换到备份电源。另外，
为产生微处理器复位的按键输入，详细信息请参考

是低成本、高精度

(MEMS)

保存秒、分、时、星期、日期、月和年信息。少于31天

24

提高了器件的长期精确度，并减少了生产线

DS3231M

小时或带

采用与流行的

AM/PM

1Hz

状态，检测电源故障，提供复位输出，并

V

CC

实时时钟

I2C

(RTC)

DS3231RTC

指示的12小时格式。提供两个可

输出。地址与数据通过

监测引脚可以作

RST



电表

工业应用



概述

。该器件包

相同的

双向

I2C

方框图

应用

定购信息

。

5ppm、I2C

±



S

-40°C至+85°C
(

0.432秒/天)

±

S

为连续计时提供电池备份

S

低功耗

S

S

S

S

1Hz和32.768kHz输出

S

S

高速(400kHz) I2C

S

+2.3V至+5.5V

S

S

-40°C至+85°C

S

16引脚SO (300mil)封装

S

器件封装和功能与

完整的时钟日历功能包括秒、分、时、星期、日期、月和年
计时，并提供有效期到

两个日历闹钟

复位输出和按钮去抖输入

精度为

通过美国保险商实验室协会

±

3°C

温度范围内，计时精度保持在

DS3231兼容

年的闰年补偿

2100

串行总线

电源电压

的数字温度传感器

工作温度范围

(UL)认证

实时时钟

5ppm

±

DS3231M

特性

PART TEMP RANGE PIN-PACKAGE

DS3231MZ+*
DS3231M+

表示无铅

+

未来产品—供货状况请与工厂联系。

*

(Pb)/符合RoHS

-40NC to +85NC

-40NC to +85NC

标准的封装。

8 SO
16 SO



I/O PORT

INTERRUPTS

CPU

SCL

SDA

32KHZ V

INT/SQW

RST

典型工作电路

+3.3V+3.3V

BAT

DS3231M

注意：该器件某些版本的规格可能与发布的规格不同，会以勘误表的形式给出。通过不同销售渠道可能同时获得器件的多个版本。欲了解器件勘误
表信息，请点击：

本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。

有关价格、供货及订购信息，请联络
或访问

Maxim

china.maxim-ic.com/errata

_______________________________________________________________ Maxim Integrated Products 1

的中文网站：

china.maxim-ic.com

。

Maxim

亚洲销售中心：

。

10800 852 1249 (

北中国区)，

10800 152 1249 (

南中国区)，

5ppm、I2C

±

实时时钟

ABSOLUTE MAXIMUM RATINGS

Voltage Range on Any Pin Relative to GND ........-0.3V to +6.0V

Operating Temperature Range .......................... -40NC to +85NC

Storage Temperature Range ............................ -55NC to +125NC

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.

DS3231M

Lead Temperature (soldering, 10s) ................................+260NC

Soldering Temperature (reflow) ......................................+260NC

RECOMMENDED OPERATING CONDITIONS

(TA = -40NC to +85NC, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage

Logic 1 V

Logic 0 V

V

V

BAT

CC

IH

IL

2.3 3.3 5.5

2.3 3.0 5.5

0.7 x
V

CC

-0.3

VCC +

0.3 x
V

0.3

CC

V

V

V

ELECTRICAL CHARACTERISTICS—FREQUENCY AND TIMEKEEPING

(VCC or V
T

= +25NC, unless otherwise noted.)

A

1Hz Frequency Tolerance

1Hz Frequency Stability vs. V
Voltage

Timekeeping Accuracy tK

32kHz Frequency Tolerance

= +3.3V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, V

BAT

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Measured over R 10s interval Q5

OUT

A

OUT

CC

Df/f

Df/V Q1

Df/f

DC ELECTRICAL CHARACTERISTICS—GENERAL

(VCC = +2.3V to +5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, V
+25NC, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Active Supply Current
(I2C Active: Includes
Temperature Conversion Current)

Standby Supply Current

2

(I

C Inactive: Includes

Temperature Conversion Current)

Temperature Conversion Current

2

C Inactive)

(I

I

CCA

I

CCS

I

CCSCONV

VCC = +3.63V 200

V

= V

CC

CCMAX

VCC = +3.63V 130

V

= V

CC

CCMAX

VCC = +3.63V 575

= V

V

CC

CCMAX

= +3.0V, and

BAT

Q0.432

= +3.0V, and TA =

BAT

Seconds/

Q2.5

300

200

650

ppm

ppm/V

Day

%

µA

µA

µA

2

5ppm、I2C

±

DC ELECTRICAL CHARACTERISTICS—GENERAL (continued)

(VCC = +2.3V to +5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, V
+25NC, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Fail Voltage V

Logic 0 Output
(32KHZ, INT/SQW, SDA)

Logic 0 Output
(RST)

Output Leakage
(32KHZ, INT/SQW, SDA)

Input Leakage
(SCL)

RST I/O Leakage

Leakage I

V

BAT

Temperature Accuracy TEMP
Temperature Conversion Time t
Pushbutton Debounce PB
Reset Active Time t
Oscillator Stop Flag (OSF) Delay t

V

V

I

I

I

BATLKG

CONV

RST

OSF

PF

OL

OL

LO

LI

OL

ACCVCC

DB

IOL = 3mA 0.4 V

IOL = 1mA 0.4 V

or V

(Note 2) 125 200 ms

BAT

= +3.3V

2.45 2.575 2.70 V

-0.1 +0.1 µA

-0.1 +0.1 µA

-200 +10 µA
25 100 nA

10 ms

250 ms
250 ms

实时时钟

= +3.0V, and TA =

BAT

Q3 NC

DS3231M

DC ELECTRICAL CHARACTERISTICS—V

(VCC = 0V, V
and T

= +25NC, unless otherwise noted.)

A

Active Battery Current

2

(I

C Active) (Note 3)

Timekeeping Battery Current

2

(I

C Inactive) (Note 3)

Temperature Conversion Current

2

(I

C Inactive)

Data Retention Current
(Oscillator Stopped and I2C
Inactive)

= +2.3V to +5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 0V, V

BAT

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

= +3.63V 70

I

BATA

I

BATT

I

BATTC

I

BATDR

BAT

= V

V

BAT

V

BAT

V

BAT

V

BAT

V

BAT

TA = +25NC

BATMAX

= +3.63V, EN32KHZ = 0 2 3.0
= V

BATMAX

= +3.63V 575
= V

BATMAX

CURRENT CONSUMPTION

BAT

, EN32KHZ = 0 2 3.5

AC ELECTRICAL CHARACTERISTICS—POWER SWITCH

(TA = -40NC to +85NC, unless otherwise noted.) (Figure 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

Fall Time, V

CC

V

PFMIN

Rise Time, V

V

CC

V

PFMAX

Recovery at Power-Up t

PFMAX

PFMIN

to

to

t

VCCF

t

VCCR

REC

(Note 4) 250 300 ms

300

0

= +3.0V,

BAT

150

650

100 nA

µA

µA

µA

Fs

Fs

3

5ppm、I2C

±

实时时钟

AC ELECTRICAL CHARACTERISTICS—I2C INTERFACE

(VCC or V
and T

SCL Clock Frequency f

Bus Free Time Between STOP

DS3231M

and START Conditions

Hold Time (Repeated) START
Condition

Low Period of SCL t
High Period of SCL t
Data Hold Time t
Data Set-Up Time t
START Set-Up Time t

SDA and SCL Rise Time t

SDA and SCL Fall Time t

STOP Set-Up Time t
SDA, SCL Input Capacitance C

Note 1: All voltages are referenced to ground.
Note 2: The parameter t
Note 3: Includes the temperature conversion current (averaged).
Note 4: This delay applies only if the oscillator is enabled. If the EOSC bit is 1, t

Note 5: Interface timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with standard mode

Note 6: C

= +2.3V to +5.5V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, V

BAT

= +25NC, unless otherwise noted.) (Note 5, Figure 1)

A

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL

t

BUF

t

HD:STA

LOW

HIGH

HD:DAT

SU:DAT

SU:STA

R

SU:STO

BIN

is the period of time the oscillator must be stopped for the OSF flag to be set.

OSF

The state of RST does not affect the I2C interface or RTC functions.

I2C timing.

: Total capacitance of one bus line in picofarads.

B

(Note 6)

(Note 6)

F

is bypassed and RST immediately goes high.

REC

0 400 kHz

1.3

0.6

1.3

0.6
0 0.9

100 ns

0.6

20 +

0.1C

20 +

0.1C

0.6

B

B

10 pF

300 ns

300 ns

BAT

= +3.0V,

Fs

Fs

Fs
Fs
Fs

Fs

Fs

4



SDA

t

BUF

t

LOW

SCL

t

HD:STA

STOP START REPEATED

NOTE: TIMING IS REFERENCED TO V

图

时序

1.I2C

ILMAX

AND V

IHMIN

t

R

t

HD:DAT

.

t

HIGH

t

F

t

SU:DAT

START

t

SU:STA

5ppm、I2C

±

t

HD:STA

实时时钟

t

SP

t

SU:STO

时序图

DS3231M

V

CC

RST

图

电源开关时序

2.

图

按钮复位时序

3.

V

PFMAX

V

PFMIN

t

VCCF

RST

t

VCCR

t

REC

PB

DB

t

RST

5

5ppm、I2C

±

实时时钟



= +25°C, unless otherwise noted.)

(T

A

150

DS3231M

140

130

120

110

100

90

80

SUPPLY CURRENT (µA)

70

60

50

0.5

0.4

POWER-SUPPLY CURRENT

vs. POWER-SUPPLY VOLTAGE

V

= 2.3V, EN32KHZ = 1, I

BAT

+85°C

INCREASE BELOW V
DUE TO INTERNAL PULLUP
RESISTOR ON RST

2 6

SUPPLY VOLTAGE (V)

OUT

= 0mA

+25°C

-40°C

PF

543

INT/SQW OUTPUT VOLTAGE

vs. OUTPUT CURRENT

VCC = 2.3V,

= 0V,

V

BAT

= +25°C

T

A

DS3231M toc01

DS3231M toc03

BATTERY-SUPPLY CURRENT

vs. BATTERY-SUPPLY VOLTAGE

4.0

VCC = 0V, EN32KHZ = 1, BBSQW = 0

3.5

3.0

2.5

2.0

SUPPLY CURRENT (µA)

1.5

1.0
2 6

SUPPLY VOLTAGE (V)

+85°C

+25°C

-40°C

RST OUTPUT VOLTAGE
vs. OUTPUT CURRENT

0.5

VCC = 2.45V,

= 3.0V,

V

BAT

= +25°C

T

A

0.4

典型工作特性

DS3231M toc02

543

DS3231M toc04

0.3

0.2

OUTPUT VOLTAGE (V)

0.1

0

0 10

OUTPUT CURRENT (mA)

RST OUTPUT VOLTAGE

vs. POWER SUPPLY VOLTAGE

6

V

= 3.0V,

BAT

TA = +25°C

5

4

3

TRACKS WITH V

2

OUTPUT VOLTAGE (V)

1

0

0 6

SUPPLY VOLTAGE (V)

0.3

0.2

OUTPUT VOLTAGE (V)

0.1

8642

0

0 5

OUTPUT CURRENT (mA)

4321

FREQUENCY ERROR

vs. TEMPERATURE

10

VCC = 3.3V

8

DS3231M toc05

CC

42

6

4

2

0

-2

-4

FREQUENCY ERROR (ppm)

-6

-8

-10

-50 100
TEMPERATURE (°C)

500

DS3231M toc06

LIMITS

6