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PDF DS3232 Fiche technique ( Data sheet )

Numéro de référence DS3232
Description Extremely Accurate I2C RTC
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products Logo 



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DS3232 Datasheet, Description
www.DataSheet4U.com
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.
DS3232 Fiche technique
Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.3V to 5.5V, VCC = active supply (see Table 1), TA = -40°C to +85°C, unless otherwise noted.) (Typical values are at VCC =
3.3V, VBAT = 3.0V, and TA = +25°C, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Logic 0 Output, INT/SQW, SDA
Logic 0 Output, RST, 32kHz
Output Leakage Current 32kHz,
INT/SQW, SDA
Input Leakage SCL
RST Pin I/O Leakage
TCXO
Output Frequency
Frequency Stability vs.
Temperature
Frequency Stability vs. Voltage
Trim Register Frequency
Sensitivity per LSB
Temperature Accuracy
Crystal Aging
SYMBOL
VOL
VOL
IOL = 3mA
IOL = 1mA
CONDITIONS
ILO Output high impedance
ILI
IOL RST high impedance (Note 5)
MIN
-1
-1
-200
TYP MAX UNITS
0.4 V
0.4 V
0 +1 µA
+1 µA
+10 µA
fOUT
f/fOUT
f/V
f/LSB
Temp
f/f0
VCC = 3.3V or VBAT = 3.3V
VCC = 3.3V or
VBAT = 3.3V
0°C to +40°C
-40°C to 0°C and
+40°C to +85°C
VCC = 3.3V or VBAT = 3.3V
-40°C
Specified at:
+25°C
+70°C
+85°C
VCC = 3.3V or VBAT = 3.3V
After reflow,
First year
not production tested
0–10 years
-2
-3.5
-3
32.768
+2
+3.5
1
0.7
0.1
0.4
0.8
±1.0
±5.0
+3
kHz
ppm
ppm/V
ppm
°C
ppm
ELECTRICAL CHARACTERISTICS
(VCC = 0V, VBAT = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
Active Battery Current
(Note 4)
Timekeeping Battery Current
(Note 4)
Temperature Conversion Current
Data-Retention Current
SYMBOL
IBATA
IBAT
ITC
IBATTC
CONDITIONS
EOSC = 0, BBSQW = 0,
VBAT = 3.3V
SCL = 400kHz, BB32kHz = 0 VBAT = 5.5V
EOSC = 0, BBSQW = 0,
SCL = SDA = 0V,
BB32kHz = 0
VBAT = 3.4V
VBAT = 5.5V
EOSC = 0, BBSQW = 0, SCL = SDA = 0V
EOSC = 1, SCL = SDA = 0V, +25°C
MIN
TYP
1.5
1.5
MAX
80
200
2.5
3.0
600
100
UNITS
µA
µA
µA
nA
_____________________________________________________________________ 3

3 Page

DS3232 pdf
Extremely Accurate I2C RTC with
Integrated Crystal and SRAM
Data Transfer on I2C Serial Bus
SDA
tBUF
SCL
STOP
START
tLOW
tHD:STA
tR tF
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSP
tSU:STO
WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may
cause loss of data.
Note 1: Limits at -40°C are guaranteed by design and not production tested.
Note 2: All voltages are referenced to ground.
Note 3: ICCA—SCL clocking at max frequency = 400kHz.
Note 4: Current is the averaged input current, which includes the temperature conversion current.
Note 5: The RST pin has an internal 50k(nominal) pullup resistor to VCC.
Note 6: After this period, the first clock pulse is generated.
Note 7: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIH(MIN) of the SCL signal)
to bridge the undefined region of the falling edge of SCL.
Note 8: The maximum tHD:DAT needs only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 9: A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT 250ns must then be met. This
is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the
low period of the SCL signal, it must output the next data bit to the SDA line tR(MAX) + tSU:DAT = 1000 + 250 = 1250ns
before the SCL line is released.
Note 10: CB—total capacitance of one bus line in pF.
Note 11: Minimum operating frequency of the I2C interface is imposed by the timeout period.
Note 12: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage range of
0V VCC VCC(MAX) and 2.3V VBAT 3.4V.
Note 13: This delay only applies if the oscillator is enabled and running. If the EOSC bit is 1, tREC is bypassed and RST immediately
goes high.
6 _____________________________________________________________________

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