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PDF DS3232 Data sheet ( Hoja de datos )
| Número de pieza | DS3232 | |
| Descripción | Extremely Accurate I2C RTC | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 2; 3/06
Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
General Description
The DS3232 is a low-cost temperature-compensated
crystal oscillator (TCXO) with a very accurate, tempera-
ture-compensated, integrated real-time clock (RTC) and
236 bytes of battery-backed SRAM. Additionally, the
DS3232 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 DS3232
is available in commercial and industrial temperature
ranges, and is offered in an industry-standard 20-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
Typical Operating Circuit
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
♦ 236 Bytes of Battery-Backed SRAM
♦ Low-Power Consumption
♦ Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2099
♦ 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
♦ 300-Mil, 20-Pin SO Package
♦ Underwriters Laboratory (UL) Recognized
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
DS3232S#
0°C to +70°C 20 SO
DS3232
DS3232SN# -40°C to +85°C 20 SO
DS3232N
# Denotes a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements. Lead finish is JESD97
Category e3, and is compatible with both lead-based and
lead-free soldering processes. A "#" anywhere on the top mark
denotes a RoHS-compliant device.
Pin Configuration
RPU = tR / CB
VCC
VCC
RPU RPU
CPU
PUSH-
BUTTON
RESET
SCL
SDA
RST
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
VCC
VCC
INT/SQW
32kHz
VBAT
DS3232
GND
N.C.
N.C.
N.C.
N.C.
N.C.
TOP VIEW
N.C. 1
N.C. 2
32kHz 3
VCC 4
INT/SQW 5
RST 6
N.C. 7
N.C. 8
N.C. 9
N.C. 10
DS3232
20 SCL
19 N.C.
18 SCL
17 SDA
16 VBAT
15 GND
14 N.C.
13 N.C.
12 N.C.
11 N.C.
SO
*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 RTC with
Integrated Crystal and SRAM
Pushbutton Reset Timing
RST
PBDB
tRST
VCC
VPF(MAX)
VPF(MIN)
RST
VPF
tVCCF
Power-Switch Timing
VPF
tVCCR
tREC
_____________________________________________________________________ 5
5 Page 
Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
Figure 1. Address Map for DS3232 Timekeeping Registers and SRAM
ADDRESS
00H
01H
BIT 7
MSB
0
0
02H 0
03H 0
04H 0
BIT 6 BIT 5 BIT 4
10 Seconds
10 Minutes
12/24
AM/PM
10 Hour
10 Hour
000
0 10 Date
BIT 3
0
BIT 2 BIT 1
Seconds
Minutes
Hour
Day
Date
05H Century
0
0 10 Month
Month
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
A1M1
A1M2
A1M3
A1M4
A2M2
A2M3
A2M4
EOSC
OSF
SIGN
SIGN
DATA
10 Year
10 Seconds
10 Minutes
12/24
AM/PM
10 Hour
10 Hour
DY/DT
10 Date
12/24
10 Minutes
AM/PM
10 Hour
10 Hour
DY/DT
10 Date
BBSQW CONV
BB32kHz CRATE1
DATA DATA
DATA DATA
DATA
0
RS2
CRATE0
DATA
DATA
0
RS1
EN32kHz
DATA
DATA
0
Year
Seconds
Minutes
Hour
Day
Date
Minutes
Hour
Day
Date
INTCN A2IE
BSY A2F
DATA DATA
DATA DATA
00
BIT 0
LSB
FUNCTION
Seconds
Minutes
Hours
Day
Date
Month/
Century
Year
Alarm 1 Seconds
Alarm 1 Minutes
Alarm 1 Hours
Alarm 1 Day
Alarm 1 Date
Alarm 2 Minutes
Alarm 2 Hours
A1IE
A1F
DATA
DATA
0
Alarm 2 Day
Alarm 2 Date
Control
Control/Status
Aging Offset
MSB of Temp
LSB of Temp
13H 0 0 0 0
0 0 0 0 Not used
14H–0FFh
x
x
x
x
x xxx
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
SRAM
RANGE
00–59
00–59
1–12 + AM/PM
00–23
1–7
00–31
01–12 +
Century
00–99
00–59
00–59
1–12 + AM/PM
00–23
1–7
1–31
00–59
1–12 + AM/PM
00–23
1–7
1–31
—
—
—
—
—
Reserved for
test
00h–0FFh
the DS3232. When the microcontroller resets, the
DS3232 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.
If SCL is held low for greater than tIF, the internal I2C
interface is reset. This limits the minimum frequency at
which the I2C interface can be operated. If data is
being written to the device when the interface timeout is
exceeded, prior to the acknowledge, the incomplete
byte of data is not written.
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 initialized by writing the appropriate register bytes.
The contents of the time and calendar registers are in
binary-coded decimal (BCD) format. The DS3232 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, 12-hour mode is selected. In 12-
hour mode, bit 5 is the AM/PM bit with logic-high being
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet DS3232.PDF ] | |
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