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. Reads and writes are inhibited while the
clock continues to run. The device is programmed seri-
ally through an I
2
C
*
bidirectional bus.
Features
♦
Enhanced Second Source for the ST M41T00
♦
Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
♦
Fast (400kHz) I
2
C 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
♦
Underwriters Laboratory (UL) Recognized
DS1340
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
PART
DS1340Z-18
DS1340Z-3
DS1340Z-33
DS1340U-18
DS1340U-3
DS1340U-33
V
CC
CRYSTAL
V
CC
R
PU
R
PU
1
X1
6 SCL
CPU
2
X2
8
V
CC
FT/OUT
7
C1
V
CC
Ordering Information
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 SO (0.150in)
-40°C to +85°C 8 µSOP
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
TOP
MARK
†
D1340-18
DS1340-3
D1340-33
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
1340C-33
D1340-18
DS1340-3
D1340-33
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
1340C-33
Typical Operating Circuit
DS1340C-18
DS1340C-3
DS1340C-33
DS1340Z-18+
DS1340Z-3+
DS1340Z-33+
DS1340U-3+
DS1340C-18#
DS1340C-3#
DS1340C-33#
DS1340U-18+ -40°C to +85°C 8 µSOP
DS1340
5 SDA
R
PU
= t
R
/ C
B
GND
4
V
BACKUP
3
DS1340U-33+ -40°C to +85°C 8 µSOP
+
Denotes a lead-free/RoHS-compliant device.
*Purchase
of I
2
C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms to
the I
2
C Standard Specification as defined by Philips.
#
Denotes a RoHS-compliant device that may include lead that
is exempt under 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.
______________________________________________
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.
I
2
C RTC with Trickle Charger
DS1340
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Pin Relative to Ground .....-0.3V to +6.0V
Voltage Range on SDA, SCL, and FT/OUT
Relative to Ground..................................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature Range............................See IPC/JEDEC
J-STD-020 Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
[b]Introduction[/b]With the development of electronic technology, the scale of chips is getting bigger and bigger, and the packaging is getting smaller and smaller. Correspondingly, the difficulty of ...
createApplicationRecord(package name), what data settings are made in this NFC API? Only by understanding this problem can I encapsulate the data containing the application package name in RTD and sen...
I am a young man who loves music
In search of the sound of nature
Over the mountains and across the sea
Break through the levels
Just to get Infineon audio chip
Let the sounds of nature flow from my s...
Experiment Name: Characterization of microdroplets and amino acid detection applications in droplet microfluidic chip system
Microfluidics or microfluidic chip labs integrate basic operating units suc...
[p=26, null, left][color=#333333][font=Arial]MSP430 uses fuses or electronic fuses to protect internal code. If the fuse is blown, JTAG or BSL cannot be used to illegally access the internal code. MSP...
The product uses the BSP image of WINCE 6. After the image is started and enters the windows screen, a white horizontal stripe with a length of 1 cm and a width of the screen will scroll from top to b...
1. Overview
Will passive devices
produce nonlinear intermodulation distortion? The answer is yes! Although there is no systematic theoretical analysis, it has been found in engineerin...[Details]
No matter which processor you are learning, the first thing you need to understand is the registers and working mode of the processor.
ARM has 37 registers, including 31 general registers and ...[Details]
As cellular phones become more advanced, the power consumption of the system during operation and the power consumption during standby are also increasing. Therefore, the power management design of...[Details]
1. What is temperature?
Heat is a type of molecular motion. The hotter an object is, the faster its molecules move. Absolute zero is defined as the temperature at which all molecular motion ...[Details]
Vertical cavity surface emitting lasers (VCSELs) are gradually replacing traditional edge emitting lasers, especially in low bandwidth and short-distance communication systems where cost factors ar...[Details]
Product series: PB-B-RS232/485 interface (hereinafter sometimes referred to as "interface") is a product in the PROFIBUS bus bridge series.
The main purpose of the bridge series ...[Details]
1 Introduction
In recent years, there have been many major advances in the production technology and processes of automotive headlights, which have greatly improved the performance of automoti...[Details]
Different initialization between C8051F and 80C51 series microcontrollers
In the past 30 years, major electronic component manufacturers in the world have launched their own unique single-chip...[Details]
At present, a large number of cooling tower fans, speed fans and special fans are in use in petroleum, chemical, pharmaceutical, metallurgical and other enterprises. Some fans have no monitoring in...[Details]
Almost everyone in a student dormitory has a bedside lamp. But if you want to read for a while after turning off the lights and don't want to disturb your roommates' sleep, you may need a reading l...[Details]
The fluorescent lamps and energy-saving lamps we commonly use now have greatly improved luminous efficiency compared with the earlier ordinary incandescent lamps and have been widely used. With the...[Details]
Today, with the increasing integration of functions, mobile phones can also be used as portable media players (PMP), digital cameras, handheld computers (PDAs), and even global positioning systems (GP...[Details]
With the popularity of digital appliances, rechargeable batteries can be seen everywhere in people's daily lives and have become one of the indispensable daily necessities.
This article gives ...[Details]
0 Introduction
With the rapid development of modern power electronics technology, various power electronic devices have been widely used in various fields such as power systems, industry, an...[Details]
0 Introduction
PROFIBUS is an open digital communication system with a wide range of applications, which has been included in the international standards IEC 61158 and IEC 61784. Since the gen...[Details]
MCU
京公网安备 11010802033920号
EEWORLD
