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PDF DS3231 Data sheet ( Hoja de datos )

Número de pieza DS3231
Descripción Extremely Accurate I2C-Integrated RTC/TCXO/Crystal
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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No Preview Available ! DS3231 Hoja de datos, Descripción, Manual

DS3231
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
General Description
The DS3231 is a low-cost, extremely accurate I2C
real-time clock (RTC) with an integrated temperature-
compensated crystal oscillator (TCXO) and crystal.
The device incorporates a battery input, and maintains
accurate timekeeping when main power to the device
is interrupted. The integration of the crystal resonator
enhances the long-term accuracy of the device as well
as reduces the piece-part count in a manufacturing line.
The DS3231 is available in commercial and industrial
temperature ranges, and is offered in a 16-pin, 300-mil
SO package.
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 programmable square-wave output are
provided. Address and data are transferred serially
through an I2C bidirectional bus.
A precision temperature-compensated voltage reference
and comparator circuit monitors the status of VCC to
detect power failures, to provide a reset output, and to
automatically switch to the backup supply when necessary.
Additionally, the RST pin is monitored as a pushbutton
input for generating a μP reset.
Typical Operating Circuit
VCC
VCC RPU = tR/CB
RPU RPU
SCL
SDA
P
RST
PUSHBUTTON
RESET
SCL
SDA
RST
N.C.
N.C.
N.C.
N.C.
Benefits and Features
● Highly Accurate RTC Completely Manages All
Timekeeping Functions
• Real-Time Clock Counts Seconds, Minutes, Hours,
Date of the Month, Month, Day of the Week, and
Year, with Leap-Year Compensation Valid Up to 2100
• Accuracy ±2ppm from 0°C to +40°C
• Accuracy ±3.5ppm from -40°C to +85°C
• Digital Temp Sensor Output: ±3°C Accuracy
• Register for Aging Trim
RST Output/Pushbutton Reset Debounce Input
• Two Time-of-Day Alarms
• Programmable Square-Wave Output Signal
● Simple Serial Interface Connects to Most
Microcontrollers
• Fast (400kHz) I2C Interface
● Battery-Backup Input for Continuous Timekeeping
• Low Power Operation Extends Battery-Backup
Run Time
• 3.3V Operation
● Operating Temperature Ranges: Commercial
(0°C to +70°C) and Industrial (-40°C to +85°C)
● Underwriters Laboratories® (UL) Recognized
Applications
● Servers
● Telematics
● Utility Power Meters
● GPS
Ordering Information and Pin Configuration appear at end of data
sheet.
VCC
VCC
INT/SQW
32kHz
DS3231
GND
VBAT
N.C.
N.C.
N.C.
N.C.
Underwriters Laboratories is a registered certification mark of
Underwriters Laboratories Inc.
19-5170; Rev 10; 3/15

1 page




DS3231 pdf
DS3231
Pushbutton Reset Timing
RST
PBDB
Power-Switch Timing
VCC
VPF(MAX)
VPF(MIN)
VPF
tVCCF
RST
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
tRST
VPF
tVCCR
tREC
www.maximintegrated.com
Maxim Integrated 5

5 Page





DS3231 arduino
DS3231
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
ADDRESS
BIT 7
MSB
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
LSB
FUNCTION
RANGE
00h 0
10 Seconds
Seconds
Seconds
00–59
01h 0
10 Minutes
Minutes
Minutes
00–59
02h 0 12/24 AM/PM 10 Hour
20 Hour
Hour
Hours
1–12 + AM/PM
00–23
03h 0 0 0
0
0
Day
Day 1–7
04h 0 0
10 Date
Date
Date
01–31
05h Century 0
0 10 Month
Month
Month/
Century
01–12 + Century
06h 10 Year
Year
Year
00–99
07h A1M1
10 Seconds
Seconds
Alarm 1 Seconds
00–59
08h A1M2
10 Minutes
Minutes
Alarm 1 Minutes
00–59
AM/PM
09h A1M3 12/24 20 Hour 10 Hour
Hour
Alarm 1 Hours
1–12 + AM/PM
00–23
0Ah A1M4 DY/DT
10 Date
Day
Date
Alarm 1 Day
Alarm 1 Date
1–7
1–31
0Bh A2M2
10 Minutes
Minutes
Alarm 2 Minutes
00–59
0Ch
A2M3
12/24
AM/PM
20 Hour
10 Hour
Hour
Alarm 2 Hours
1–12 + AM/PM
00–23
0Dh A2M4 DY/DT
10 Date
Day
Date
Alarm 2 Day
Alarm 2 Date
1–7
1–31
0Eh
EOSC BBSQW CONV
RS2
RS1 INTCN A2IE A1IE
Control
0Fh OSF 0
0
0 EN32kHz BSY A2F A1F Control/Status
10h
SIGN DATA DATA
DATA
DATA DATA DATA DATA Aging Offset
11h
SIGN DATA DATA
DATA
DATA DATA DATA DATA MSB of Temp
12h DATA DATA 0
0
0 0 0 0 LSB of Temp
Figure 1. Timekeeping Registers
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
Address Map
Figure 1 shows the address map for the DS3231 time-
keeping registers. During a multibyte access, when the
address pointer reaches the end of the register space
(12h), it wraps around to location 00h. On an I2C START
or address pointer incrementing to location 00h, the cur-
rent time is transferred to a second set of registers. The
time information is read from these secondary registers,
while the clock may continue to run. This eliminates the
need to reread the registers in case the main registers
update during a read.
I2C Interface
The I2C interface is accessible whenever either VCC or
VBAT is at a valid level. If a microcontroller connected
to the DS3231 resets because of a loss of VCC or other
event, it is possible that the microcontroller and DS3231
I2C communications could become unsynchronized, e.g.,
the microcontroller resets while reading data from the
DS3231. When the microcontroller resets, the DS3231
I2C interface may be placed into a known state by tog-
gling SCL until SDA is observed to be at a high level. At
that point the microcontroller should pull SDA low while
SCL is high, generating a START condition.
Clock and Calendar
The time and calendar information is obtained by reading
the appropriate register bytes. Figure 1 illustrates the RTC
registers. The time and calendar data are set or initialized
by writing the appropriate register bytes. The contents of
the time and calendar registers are in the binary-coded
www.maximintegrated.com
Maxim Integrated 11

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