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PDF DS3231 Data sheet ( Hoja de datos )
| Número de pieza | DS3231 | |
| Descripción | Extremely Accurate I2C-Integrated RTC/TXO/Crystal | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Rev 2; 6/05
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 accu-
rate timekeeping when main power to the device is inter-
rupted. 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 refer-
ence 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 nec-
essary. Additionally, the RST pin is monitored as a
pushbutton input for generating a reset externally.
Applications
Servers
Telematics
Utility Power Meters
GPS
Pin Configuration appears at end of data sheet.
Features
♦ Accuracy ±2ppm from 0°C to +40°C
♦ Accuracy ±3.5ppm from -40°C to +85°C
♦ Battery Backup Input for Continuous
Timekeeping
♦ Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
♦ Low-Power Consumption
♦ Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2100
♦ Two Time-of-Day Alarms
♦ Programmable Square-Wave Output
♦ Fast (400kHz) I2C Interface
♦ 3.3V Operation
♦ Digital Temp Sensor Output: ±3°C Accuracy
♦ Register for Aging Trim
♦ RST Input/Output
♦ UL Recognized
Ordering Information
PART
TEMP RANGE
DS3231S
0°C to +70°C
DS3231SN -40°C to +85°C
DS3231S+
0°C to +70°C
DS3231SN+ -40°C to +85°C
+Denotes lead-free
PIN-PACKAGE
16 SO
16 SO
16 SO
16 SO
TOP
MARK
DS3231
DS3231N
DS3231+
DS3231N+
Typical Operating Circuit
VCC VCC
VCC RPU = tR/CB
RPU RPU
SCL
VCC
INT/SQW
CPU
PUSHBUTTON
RESET
SDA DS3231 32kHz
RST VBAT
N.C.
N.C.
N.C.
N.C. GND
N.C.
N.C.
N.C.
N.C.
Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
Pushbutton Reset Timing
RST
PBDB
tRST
VCC
VPF(MAX)
VPF(MIN)
VPF
tVCCF
RST
Power-Switch Timing
VPF
tVCCR
tREC
_____________________________________________________________________ 5
5 Page 
Extremely Accurate I2C-Integrated
RTC/TCXO/Crystal
Figure 1. Timekeeing Registers
ADDRESS
00H
01H
BIT 7
MSB
0
0
02H 0
03H 0
04H 0
BIT 6 BIT 5
BIT 4
12/24
0
0
10 Seconds
10 Minutes
AM/PM
10 Hour
10 Hour
00
10 Date
BIT 3
0
BIT 2 BIT 1
Seconds
Minutes
BIT 0
LSB
Hour
Day
Date
FUNCTION
Seconds
Minutes
Hours
Day
Date
RANGE
00–59
00–59
1–12 + AM/PM
00–23
1–7
00–31
05H Century 0
0 10 Month
Month
Month/
Century
01–12 +
Century
06H
07H
08H
09H
0AH
A1M1
A1M2
A1M3
A1M4
10 Year
10 Seconds
10 Minutes
12/24
AM/PM
10 Hour
10 Hour
DY/DT
10 Date
Year
Seconds
Minutes
Hour
Day
Date
Year
Alarm 1 Seconds
Alarm 1 Minutes
Alarm 1 Hours
Alarm 1 Day
Alarm 1 Date
00–99
00–59
00–59
1–12 + AM/PM
00–23
1–7
1–31
0BH A2M2
10 Minutes
Minutes
Alarm 2 Minutes
00–59
0CH
A2M3
12/24
AM/PM
10 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
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
—
DS3231 I2C interface may be placed into a known state
by toggling 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 read-
ing the appropriate register bytes. Figure 1 illustrates the
RTC registers. The time and calendar data are set or ini-
tialized by writing the appropriate register bytes. The con-
tents of the time and calendar registers are in the
binary-coded decimal (BCD) format. The DS3231 can be
run in either 12-hour or 24-hour mode. Bit 6 of the hours
register is defined as the 12- or 24-hour mode select bit.
When high, the 12-hour mode is selected. In the 12-hour
mode, bit 5 is the AM/PM bit with logic-high being PM. In
the 24-hour mode, bit 5 is the second 10-hour bit (20–23
hours). The century bit (bit 7 of the month register) is tog-
gled when the years register overflows from 99 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., if 1 equals
Sunday, then 2 equals Monday, and so on). Illogical
time and date entries result in undefined operation.
When reading or writing the time and date registers, sec-
ondary (user) buffers are used to prevent errors when
the internal registers update. When reading the time and
date registers, the user buffers are synchronized to the
internal registers on any START and when the register
pointer rolls over to zero. The time information is read
from these secondary registers, while the clock contin-
ues to run. This eliminates the need to reread the regis-
ters in case the main registers update during a read.
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet DS3231.PDF ] | |
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