Rainbow-electronics DS1340 Manuel d'utilisateur

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General Description
The DS1340 is a real-time clock (RTC)/calendar that is
pin compatible and functionally equivalent to the ST
M41T00, including the software clock calibration. The
device additionally provides trickle-charge capability
on the V
BACKUP
pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional regis-
ters, which are accessed individually, are required for
the trickle charger and flag. The clock/calendar pro-
vides seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the back-
up supply. The device is programmed serially through
a 2-wire bidirectional bus.
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
Features
Enhanced Second Source for the ST M41T00
Fast (400kHz) 2-Wire Interface
Software Clock Calibration
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
Automatic Power-Fail Detect and Switch Circuitry
Trickle-Charge Capability
Low Timekeeping Voltage Down to 1.3V
Three Operating Voltage Ranges (1.8V, 3V, and
3.3V)
Oscillator Stop Flag
Available in 8-Pin µSOP or SO Packages
DS1340
2-Wire RTC with Trickle Charger
______________________________________________ Maxim Integrated Products 1
1
2
3
4
8
7
6
5
V
CC
FT/OUT
SCL
SDA
V
BACKUP
GND
X2
X1
TOP VIEW
DS1340
SO,
µSOP
Pin Configuration
Ordering Information
4
CPU
V
CC
V
CC
V
CC
5
6
8
12
SDA
SCL
GND
X2X1
V
CC
RPU RPU
CRYSTAL
FT/OUT
V
BACKUP
3
7
RPU = t
R
/ C
B
DS1340
Typical Operating Circuit
Rev 0; 6/03
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.
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
DS1340Z-18
-40°C to +85°C 8 SO (0.150in)
D1340-18
DS1340Z-3
-40°C to +85°C 8 SO (0.150in)
DS1340-3
DS1340Z-33
-40°C to +85°C 8 SO (0.150in)
D1340-33
DS1340U-18
-40°C to +85°C
8 µSOP
1340
A1-18
DS1340U-3
-40°C to +85°C
8 µSOP
1340
A1-3
DS1340U-33
-40°C to +85°C
8 µSOP
1340
A1-33
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Résumé du contenu

Page 1

General DescriptionThe DS1340 is a real-time clock (RTC)/calendar that ispin compatible and functionally equivalent to the STM41T00, including the sof

Page 2 - AC ELECTRICAL CHARACTERISTICS

DS1340Bits 6 to 0: All other bits in the flag register read as 0and cannot be written.Clock CalibrationThe DS1340 provides a digital clock calibration

Page 3 - DC ELECTRICAL CHARACTERISTICS

Accordingly, the following bus conditions have beendefined:Bus not busy: Both data and clock lines remainhigh.START data transfer: A change in the dat

Page 4

DS13402-Wire RTC with Trickle ChargerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim pro

Page 5 - = +3.3V, T

DS13402-Wire RTC with Trickle Charger2 _____________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond th

Page 6 - Pin Description

DS13402-Wire RTC with Trickle Charger_____________________________________________________________________ 3RECOMMENDED DC OPERATING CONDITIONS(VCC= V

Page 7 - Address Map

DS13402-Wire RTC with Trickle Charger4 _____________________________________________________________________POWER-UP/POWER-DOWN CHARACTERISTICS(TA= -4

Page 8 - Special-Purpose Registers

DS13402-Wire RTC with Trickle Charger_____________________________________________________________________ 5OUTPUTSVCCVPF(MAX)INPUTSHIGH-ZRSTDON'

Page 9 - Flag Register (09h)

DS1340Detailed DescriptionThe DS1340 is a low-power clock/calendar with a tricklecharger. Address and data are transferred seriallythrough a 2-wire bi

Page 10 - 2-Wire Serial Data Bus

temperature shifts. External circuit noise coupled intothe oscillator circuit can result in the clock running fast.Figure 4 shows a typical PC board l

Page 11 - <RW>

DS1340the control register is located at 07h. The trickle-chargeand flag registers are located in address locations 08hto 09h. During a multibyte acce

Page 12 - Package Information

Bit 6: Frequency Test (FT). When this bit is 1, theFT/OUT pin toggles at a 512Hz rate. When FT is writtento 0, the OUT bit controls the state of the F

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