DS3231MZ+ MAXIM [Maxim Integrated Products], DS3231MZ+ Datasheet

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DS3231MZ+

Manufacturer Part Number
DS3231MZ+
Description
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
19-5312; Rev 0; 6/10
The DS3231M is a low-cost, extremely accurate, I
real-time clock (RTC). The device incorporates a battery
input and maintains accurate timekeeping when main
power to the device is interrupted. The integration of
the microelectromechanical systems (MEMS) resona-
tor enhances the long-term accuracy of the device and
reduces the piece-part count in a manufacturing line.
The DS3231M is available in the same footprint as the
popular DS3231 RTC.
The RTC maintains seconds, minutes, hours, day, date,
month, and year information. The date at the end of the
month is automatically adjusted for months with fewer
than 31 days, including corrections for leap year. The
clock operates in either the 24-hour or 12-hour format
with an AM/PM indicator. Two programmable time-of-
day alarms and a 1Hz output are provided. Address and
data are transferred serially through an I
bus. A precision temperature-compensated voltage
reference and comparator circuit monitors the status of
V
and to automatically switch to the backup supply when
necessary. Additionally, the RST pin is monitored as a
pushbutton input for generating a microprocessor reset.
See the Block Diagram for more details.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
DS3231MZ+*
DS3231M+
CC
to detect power failures, to provide a reset output,
PART
Power Meters
Industrial Applications
_______________________________________________________________ Maxim Integrated Products 1
-40NC to +85NC
-40NC to +85NC
TEMP RANGE
Ordering Information
General Description
Applications
PIN-PACKAGE
8 SO
16 SO
2
C bidirectional
±5ppm, I
2
C
S
S
S
S
S
S
S
S
S
S
S
S
S
S
Timekeeping Accuracy Q5ppm (Q0.432 Second/
Day) from -40NC to +85NC
Battery Backup for Continuous Timekeeping
Low Power Consumption
Footprint and Functionally Compatible to DS3231
Complete Clock Calendar Functionality Including
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap Year Compensation Up to Year
2100
Two Time-of-Day Alarms
1Hz and 32.768kHz Outputs
Reset Output and Pushbutton Input with
Debounce
Fast (400kHz) I
+2.3V to +5.5V Supply Voltage
Digital Temp Sensor with Q3NC Accuracy
-40NC to +85NC Temperature Range
16-Pin SO (300 mils) Package
Underwriters Laboratories (UL) Recognized
INTERRUPTS
2
+3.3V
CPU
I/O PORT
C Real-Time Clock
Typical Operating Circuit
2
C-Compatible Serial Bus
SCL
SDA
32KHZ
INT/SQW
RST
DS3231M
+3.3V
V
BAT
Features

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DS3231MZ+ Summary of contents

Page 1

... Applications Power Meters Industrial Applications Ordering Information PART TEMP RANGE DS3231MZ+* -40NC to +85NC DS3231M+ -40NC to +85NC +Denotes a lead(Pb)-free/RoHS-compliant package. *Future product—contact factory for availability. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels ...

Page 2

I C Real-Time Clock 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 ...

Page 3

DC ELECTRICAL CHARACTERISTICS—GENERAL (continued +2.3V to +5.5V -40NC to +85NC, unless otherwise noted. Typical values are +25NC, unless otherwise noted.) PARAMETER SYMBOL Power-Fail Voltage Logic 0 Output (32KHZ, INT/SQW, SDA) Logic 0 ...

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I C Real-Time Clock AC ELECTRICAL CHARACTERISTICS— +2.3V to +5.5V -40NC to +85NC, unless otherwise noted. Typical values are BAT A and T = +25NC, unless otherwise noted.) (Note ...

Page 5

SDA t BUF t LOW SCL t t HD:STA R STOP START NOTE: TIMING IS REFERENCED TO V AND V . ILMAX IHMIN 2 Figure Timing t VCCF V PFMAX V PFMIN V CC RST Figure 2. ...

Page 6

I C Real-Time Clock (T = +25°C, unless otherwise noted.) A POWER-SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 150 V = 2.3V, EN32KHZ = 1, I BAT 140 130 +85°C 120 110 100 90 80 INCREASE BELOW V 70 DUE ...

Page 7

TOP VIEW + 32KHZ INT/SQW 3 DS3231M RST 4 N.C. 5 N.C. 6 N.C. 7 N.C. 8 PIN NAME 32.768kHz Output (50% Duty Cycle). This open-drain pin requires an external pullup resistor. ...

Page 8

I C Real-Time Clock PIN NAME Serial-Data Input/Output. This pin is the data input/output for the SDA pin requires an external pullup resistor. The pullup voltage can 5.5V, ...

Page 9

BAT Figure 4. Single Supply (V Only BAT Figure 5. Single Supply (V Only) BAT +3. BAT Figure 6. Dual Power Supply Table 1. Power Control CONFIGURATION CONDITION V ...

Page 10

I C Real-Time Clock less than V and is less than device is powered by V (see Table 1). BAT When V < the RST output ...

Page 11

Table 2. Timekeeping Registers BIT 7 ADDRESS BIT 6 MSB 00h 0 10 Seconds 01h 0 10 Minutes 02h 0 12/24 03h 0 0 04h 0 0 05h Century 0 06h 10 Year 07h A1M1 10 Seconds 08h A1M2 10 ...

Page 12

I C Real-Time Clock to 00. The day-of-week register increments at midnight. Values that correspond to the day of week are user- defined but must be sequential (i.e equals Sunday, then 2 equals Monday, and so ...

Page 13

BIT 7 BIT 6 BIT 5 BBSQW CONV ESOC ESOC: Enable oscillator. When set to logic 0, the oscillator is started. When set to logic 1, the oscillator is stopped when the device switches to V BIT ...

Page 14

I C Real-Time Clock V POWERED CC INTERNAL 1Hz CLOCK BSY CONV THE USER SETS THE CONV BIT V POWERED BAT INTERNAL 1Hz CLOCK BSY CONV Figure 7. CONV Control Bit and BSY Status Bit Operation 14 THE ...

Page 15

BIT 7 BIT 6 BIT 5 OSF OSF: Oscillator stop flag. A logic 1 in this bit indicates that the oscillator either is stopped or was stopped for some period and could be used to judge the ...

Page 16

I C Real-Time Clock Temperature Register (Upper Byte = 11h) BIT 7 BIT 6 SIGN DATA 0 0 Temperature Register (Lower Byte = 12h) BIT 7 BIT 6 DATA DATA 0 0 Temperature is represented as a 10-bit ...

Page 17

Bit Write: Transitions of SDA must occur during the low state of SCL. The data on SDA must remain valid and unchanged during the entire high pulse of SCL plus the setup and hold time requirements (see Figure 1). Data ...

Page 18

I C Real-Time Clock 2 TYPICAL I C WRITE TRANSACTION MSB LSB START R/W READ/ SLAVE WRITE ADDRESS 2 EXAMPLE I C TRANSACTIONS D0h A) SINGLE BYTE WRITE ...

Page 19

For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to ...

Page 20

I C Real-Time Clock REVISION REVISION NUMBER DATE 0 6/10 Initial release Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves ...

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