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PDF DS1375 Data sheet ( Hoja de datos )
| Número de pieza | DS1375 | |
| Descripción | 2-Wire Digital Input RTC with Alarm | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 1; 1/04
heet4U2.c-Womire Digital Input RTC with AlarmGeneral Description
taSThe DS1375 digital real-time clock (RTC) is a low-power
clock/calendar that does not require a crystal. The
adevice operates from a digital clock input pin at one of
.Dfour frequencies: 32.768kHz, 8.192kHz, 60Hz, or 50Hz.
wIt maintains seconds, minutes, hours, day, date, month,
and year information. The date at the end of the month
wis automatically adjusted for months with fewer than 31
wdays, including corrections for leap year. The clock
moperates in either the 24-hour or 12-hour format with an
AM/PM indicator. Two programmable time-of-day/date
oalarms, a programmable square-wave output, and 16
bytes of SRAM are provided. Address and data are
.ctransferred serially through a 2-wire bidirectional bus.
Features
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation
Valid Up to 2100
♦ Two Programmable Alarms
♦ Programmable Square-Wave Output
♦ Operates from a 32.768kHz, 8.192kHz, 60Hz, or
50Hz Digital Clock Signal
♦ 16 Bytes of SRAM
♦ Fast (400kHz) 2-Wire Interface
♦ 1.7V to 5.5V Operation
UApplications
t4RTC Complement to the DS32kHz TCXO
Utility Meters
eAppliances
eConsumer Electronics
hAutomotive
Ordering Information
PART
DS1375
TEMP RANGE PIN-PACKAGE TOP MARK
-40°C to +85°C 6 TDFN
DS1375
.DataSTypical Operating Circuit
RPU = tr/CB
+3V
wRPU RPU
ww .comCPU
et4UINT
VCC
SCL CLK
SCA
DS1375
SQWINT
GND
VBAT
VCC
DS32kHz
GND
TOP VIEW
Pin Configuration
CLK 1
6 VCC
SQW/INT 2
GND 3
DS1375
5 SCL
4 SDA
TDFN, EXPOSED PAD
3mm x 3mm x 0.8mm
w.DataShe______________________________________________ Maxim Integrated Products 1
wFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
w1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
2-Wire Digital Input RTC with Alarm
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
ICCS vs. TEMPERATURE
135.0
132.5
130.0
VCC = 3.0V
127.5
125.0
122.5
120.0
117.5
115.0
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
ICCS vs. CLK INPUT VOLTAGE
500
450
400
VCC = 5.0V
350
300
250 VCC = 4.0V
200
150
100
50
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
CLK VOLTAGE (V)
Pin Description
PIN NAME
FUNCTION
1
CLK
Digital Clock Input. This pin must be 32,768Hz, 8192Hz, 60Hz, or 50Hz square wave, 45% to 55%
duty cycle.
2 SQW/INT Square-Wave/Interrupt Output. This pin is open drain and requires an external pullup resistor.
3
GND
Ground
4
SDA
Serial Data Input/Output. SDA is the data input/output for the 2-wire serial interface. It is open drain
and requires an external pullup resistor.
5 SCL Serial Clock Input. SCL is the clock input for the 2-wire serial interface, and is used to synchronize
data movement on the serial interface.
6 VCC DC Power for Primary Power Supply
Detailed Description
The DS1375 digital input RTC with alarm is a low-power
clock/calendar with two programmable time-of-day
alarms and a programmable square-wave output.
Address and data are transferred serially through the
2-wire serial interface bus. The clock/calendar provides
seconds, minutes, hours, day, date, month, and year
information. The date at the end of the month is auto-
matically 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. The DS1375 requires an external clock
source selectable between 32,768Hz, 8192Hz, 60Hz,
or 50Hz for the timekeeping function. Sixteen bytes of
SRAM are provided for additional user storage.
Operation
The DS1375 operates as a slave device on the serial
bus. Access is obtained by implementing a START
condition and providing a device identification code,
followed by data. Subsequent registers can be
accessed sequentially until a STOP condition is execut-
ed. The functional diagram in Figure 2 shows the main
elements of the serial RTC.
Address Map
Table 1 shows the address map for the timekeeping
registers and SRAM. The 16 bytes of SRAM occupy
addresses 10–1Fhex. During a multibyte access, when
the address pointer reaches the end of the register
space (1Fh), it wraps around to location 00h. On a
2-wire START, STOP, or address pointer incrementing
_____________________________________________________________________ 5
5 Page 
2-Wire Digital Input RTC with Alarm
the initiation of a read mode, the first address that
is read is the last one stored in the register pointer.
The DS1375 must receive a not acknowledge to
end a read.
Chip Information
TRANSISTOR COUNT: 11,797
PROCESS: CMOS
SUBSTRATE CONNECTED TO GROUND
Thermal Information
Theta-JA: 41°C/W
Theta-JC: 2°C/W
Package Information
For the latest package outline information, go to
www.maxim-ic.com/package_drawings/21-0137D.pdf.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DS1375.PDF ] | |
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