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PDF DS1338U-18 Data sheet ( Hoja de datos )

Número de pieza DS1338U-18
Descripción I2C RTC
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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19-6019; Rev 3/12
DS1338
I2C RTC with 56-Byte NV RAM
GENERAL DESCRIPTION
The DS1338 serial real-time clock (RTC) is a low-
power, full binary-coded decimal (BCD)
clock/calendar plus 56 bytes of NV SRAM. Address
and data are transferred serially through an I2C
interface. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year
information. The end of the month date 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
AM/PM indicator. The DS1338 has a built-in power-
sense circuit that detects power failures and
automatically switches to the backup supply,
maintaining time and date operation
APPLICATIONS
Handhelds (GPS, POS Terminal)
Consumer Electronics (Set-Top Box, Digital
Recording, Network Appliance)
Office Equipment (Fax/Printer, Copier)
Medical (Glucometer, Medicine Dispenser)
Telecommunications (Router, Switcher, Server)
Other (Utility Meter, Vending Machine, Thermostat,
Modem)
TYPICAL OPERATING CIRCUIT
RPU = tr/Cb
VCC RPU
VCC
CRYSTAL
RPU
VCC
CPU
X1 X2
VCC
SCL SQW/OUT
DS1338
SDA
GND
VBAT
i
FEATURES
RTC Counts Seconds, Minutes, Hours, Date
of the Month, Month, Day of the Week, and
Year with Leap-Year Compensation Valid Up
to 2100
Available in a Surface-Mount Package with an
Integrated Crystal (DS1338C)
56-Byte Battery-Backed General-Purpose
RAM with Unlimited Writes
I2C Serial Interface
Programmable Square-Wave Output Signal
Automatic Power-Fail Detect and Switch
Circuitry
-40°C to +85°C Operating Temperature Range
Underwriters Laboratories (UL) Recognized
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE TOP MARK
DS1338Z-18+
DS1338Z-3+
DS1338Z-33+
DS1338U-18+
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
DS1338U-3+ -40°C to +85°C
DS1338U-33+
DS1338C-18#
-40°C to +85°C
-40°C to +85°C
8 SO (0.150)
8 SO (0.150)
8 SO (0.150)
8 µSOP
8 µSOP
8 µSOP
16 SO (0.300)
DS1338-18
DS1338-3
DS133833
1338
rr-18
1338
rr-3
1338
rr-33
DS1338C-18
DS1338C-3# -40°C to +85°C 16 SO (0.300) DS1338C-3
DS1338C-33# -40°C to +85°C 16 SO (0.300) DS1338C-33
rr = second line, revision level
+ Denotes a lead(Pb)-free/RoHS-compliant device.
# Denotes a RoHS-compliant device that may include lead that is
exempt under the RoHS requirements. The 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 lead-free device. A “#”
denotes a RoHS-compliant device.
Pin Configurations appear at end of data sheet.
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DS1338U-18 pdf
Figure 2. Timing Diagram
DS1338 I2C RTC with 56-Byte NV RAM
Figure 3. Block Diagram
X1
X2
"C" VERSION ONLY
VCC
GND
VBAT
SCL
SDA
CL
CL
POWER
CONTROL
1Hz/4.096kHz/8.192kHz/32.768kHz
1Hz
MUX/
BUFFER
N
Oscillator
and divider
CONTROL
LOGIC
DS1338
RAM
(56 X 8)
CLOCK,
CALENDAR,
AND CONTROL
REGISTERS
SERIAL BUS
INTERFACE
AND ADDRESS
REGISTER
USER BUFFER
(7 BYTES)
SQW/OUT
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DS1338U-18 arduino
DS1338 I2C RTC with 56-Byte NV RAM
CONTROL REGISTER (07H)
The control register controls the operation of the SQW/OUT pin and provides oscillator status.
Bit #
Name
POR
BIT 7
OUT
1
BIT 6
0
0
BIT 5
OSF
1
BIT 4
SQWE
1
BIT 3
0
0
BIT 2
0
0
BIT 1
RS1
1
BIT 0
RS0
1
Bit 7: Output Control (OUT). Controls the output level of the SQW/OUT pin when the square-wave output is
disabled. If SQWE = 0, the logic level on the SQW/OUT pin is 1 if OUT = 1; it is 0 if OUT = 0.
Bit 5: Oscillator Stop Flag (OSF). A logic 1 in this bit indicates that the oscillator has stopped or was stopped for
some time period and can be used to judge the validity of the clock and calendar data. This bit is edge triggered,
and is set to logic 1 when the internal circuitry senses the oscillator has transitioned from a normal run state to a
STOP condition. The following are examples of conditions that may cause the OSF bit to be set:
1) The first time power is applied.
2) The voltage present on VCC and VBAT are insufficient to support oscillation.
3) The CH bit is set to 1, disabling the oscillator.
4) External influences on the crystal (i.e., noise, leakage, etc.).
This bit remains at logic 1 until written to logic 0. This bit can only be written to logic 0. Attempting to write OSF to
logic 1 leaves the value unchanged.
Bit 4: Square-Wave Enable (SQWE). When set to logic 1, this bit enables the oscillator output to operate with
either VCC or VBAT applied. The frequency of the square-wave output depends upon the value of the RS0 and RS1
bits.
Bits 1 and 0: Rate Select (RS1 and RS0). These bits control the frequency of the square-wave output when the
square-wave output has been enabled. The table below lists the square-wave frequencies that can be selected
with the RS bits.
Square-Wave Output
OUT RS1 RS0
X 00
X 01
X 10
X 11
0 XX
1 XX
SQW OUTPUT
1Hz
4.096kHz
8.192kHz
32.768kHz
0
1
SQWE
1
1
1
1
0
0
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