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PDF DS3234 Fiche technique - Maxim Integrated Products

Numéro de référence DS3234
Description Extremely Accurate SPI Bus RTC
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products Logo 



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DS3234 Datasheet, Description
www.DataSheet4U.com
Rev 0; 2/06
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
General Description
The DS3234 is a low-cost, extremely accurate SPI™ bus
real-time clock (RTC) with an integrated temperature-
compensated crystal oscillator (TCXO) and crystal. The
DS3234 incorporates a precision, temperature-compen-
sated voltage reference and comparator circuit to moni-
tor VCC. When VCC drops below the power-fail voltage
(VPF), the device asserts the RST output and also dis-
ables read and write access to the part when VCC drops
below both VPF and VBAT. The RST pin is monitored as
a pushbutton input for generating a reset externally. The
device switches to the backup supply input and main-
tains accurate timekeeping when main power to the
device is interrupted. The integration of the crystal res-
onator enhances the long-term accuracy of the device
as well as reduces the piece-part count in a manufactur-
ing line. The DS3234 is available in commercial and
industrial temperature ranges, and is offered in an
industry-standard 300-mil, 20-pin SO package.
The DS3234 also integrates 256 bytes of battery-backed
SRAM. In the event of main power loss, the contents of
the memory are maintained by the power source con-
nected to the VBAT pin. The RTC maintains seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically adjust-
ed for months with fewer than 31 days, including correc-
tions for leap year. The clock operates in either the
24-hour or 12-hour format with AM/PM indicator. Two
programmable time-of-day alarms and a programmable
square-wave output are provided. Address and data are
transferred serially by an SPI bidirectional bus.
Applications
Servers
Utility Power Meters
Telematics
GPS
Typical Operating Circuit
VCC
SS
SCLK
MOSI
MISO
RST
CPU
PUSH-
BUTTON
RESET
VCC VPU
CS
SCLK
DIN
DOUT
RST
N.C.
N.C.
N.C.
N.C.
N.C.
VCC
INT/SQW
32kHz
VBAT
DS3234
GND
N.C.
N.C.
N.C.
N.C.
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 2099
Two Time-of-Day Alarms
Programmable Square-Wave Output
4MHz SPI Bus Supports Modes 1 and 3
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
DS3234S#
0°C to +70°C 20 SO
DS3234S
DS3234SN# -40°C to +85°C 20 SO
DS3234SN
# 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
TOP VIEW
CS 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
DS3234
20 SCLK
19 DOUT
18 SCLK
17 DIN
16 VBAT
15 GND
14 N.C.
13 N.C.
12 N.C.
11 N.C.
SPI is a trademark of Motorola, Inc.
SO
______________________________________________ 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.
DS3234 Fiche technique
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.0V 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. TCXO operation guaranteed from 2.3V to 5.5V on VCC and 2.3V to 3.8V on
VBAT.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Logic 0 Output, 32kHz
Logic 1 Output, DOUT
Logic 0 Output, DOUT, INT/SQW
Logic 0 Output, RST
VOL
VOH
VOL
VOL
IOL = 1mA
IOH = -1.0mA
IOL = 3mA
IOL = 1.0mA
0.85 x VCC
0.4 V
V
0.4 V
0.4 V
Output Leakage Current 32kHz,
INT/SQW, DOUT
ILO Output high impedance
-1 0 +1 µA
Input Leakage DIN, CS, SCLK
RST Pin I/O Leakage
ILI
IOL RST high impedance (Note 5)
-1 +1
-200 +10
TCXO (VCC = 2.3V to 5.5V, VBAT = 2.3V to 3.8V, TA = -40°C to +85°C, unless otherwise noted.) (Notes 1 and 2)
Output Frequency
fOUT VCC = 3.3V or VBAT = 3.3V
32.768
Frequency Stability vs.
Temperature
f/fOUT
VCC = 3.3V or
VBAT = 3.3V
0°C to +40°C
-40°C to 0°C and
+40°C to +85°C
-2
-3.5
+2
+3.5
µA
µA
kHz
ppm
Frequency Stability vs. Voltage
f/V
-40°C
1 ppm/V
0.7
Trim Register Frequency
Sensitivity per LSB
f/LSB Specified at:
+25°C
+70°C
0.1
ppm
0.4
+85°C
0.8
Temperature Accuracy
Temp
-3 +3 °C
Crystal Aging
f/fOUT
After reflow,
not production tested
First year
0–10 years
±1.0
±5.0
ppm
ELECTRICAL CHARACTERISTICS
(VCC = 0V, VBAT = 2.0V to 3.8V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Battery Current
(Note 4)
Temperature Conversion Current
Data-Retention Current
IBAT EOSC = 0, BBSQW = 0
ITC
IBATTC
EOSC = 0, BBSQW = 0
EOSC = 1
VBAT = 3.4V
VBAT = 3.8V
MIN
TYP
1.5
1.5
MAX
2.3
2.5
400
100
UNITS
µA
µA
nA
_____________________________________________________________________ 3

3 Page

DS3234 pdf
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
Timing Diagram—SPI Read Transfer
CS tCCS
SCLK
tCC
DIN tDC
W/R
tR
tCL
tCDH
tCH
A6
tF
A0
DOUT
HIGH IMPEDANCE
WRITE ADDRESS BYTE
NOTE: SCLK CAN BE EITHER POLARITY, SHOWN FOR CPOL = 1.
tCDZ
tCDD
D7 D0
READ DATA BYTE
Timing Diagram—SPI Write Transfer
CS
SCLK
tCC
DIN tDC
W/R
tR
tCL
tCDH
tCH
A6
tF
A0
DOUT
WRITE ADDRESS BYTE
HIGH IMPEDANCE
tCWH
tCCH
D7 D0
WRITE DATA BYTE
6 _____________________________________________________________________

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