Rainbow-electronics DS1342 Uživatelský manuál stáhnout pdf (Strana 1)

_______________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Low-Current I

C RTCs for High-ESR Crystals

DS1341/DS1342

General Description

The DS1341/DS1342 low-current real-time clocks (RTCs)

are timekeeping devices that provide an extremely low

standby current, which permits longer life from a power

supply. The DS1341/DS1342 support high-ESR crystals,

which broaden the pool of usable crystals for the devices.

The DS1341 uses a 6pF crystal, while the DS1342 uses a

12.5pF crystal. These devices are accessed through an

C serial interface. Other features include two time-of-day

alarms, two interrupt outputs, a programmable square-

wave output, and a serial bus timeout mechanism.

The clock/calendar provides seconds, minutes, hours,

day, date, month, and year information. The date at the

end of the month is automatically adjusted for months

with fewer than 31 days, including corrections for leap

year. The clock operates in either 24hr or 12hr format

with an AM/PM indicator.

The DS1341/DS1342 also include an input for synchroni-

zation. When a reference clock (e.g., 60Hz power line or

GPS 1PPS) is present at the CLKIN pin and the enable

external clock input bit (ECLK) is set to 1, the DS1341/

DS1342 RTCs are frequency-locked to the external clock

and the clock accuracy is determined by the external

source. In case of external clock failure, the clock is

switched to the crystal oscillator.

The devices are available in a lead(Pb)-free/RoHS-

compliant, 8-pin FSOP package. The devices support a

-40NC to +85NC extended temperature range.

Applications

Features

S Low Timekeeping Current of 250nA (typ)

S Compatible with Crystal ESR Up to 80kI

S Use Crystals with C

= 6pF (DS1341) or

= 12.5pF (DS1342)

S +1.8V to +5.5V Operating Voltage Range

S Maintain Time Down to +1.15V (typ)

S Fast (400kHz) I

C Interface

S Bus Timeout for Lockup-Free Operation

S RTC Counts Seconds, Minutes, Hours, Day, Date,

Month, and Year with Leap Year Compensation

Valid Through 2099

S External Clock Source for Synchronization Clock

Reference (e.g., 32kHz, 50Hz/60Hz Power Line,

GPS 1PPS)

S Two Time-of-Day Alarms with Two Interrupt

Outputs

S Programmable Square-Wave Output

S Industrial Temperature Range

S Small, 8-Pin µSOP Package

19-4998; Rev 0; 10/09

Pin Configuration

Typical Operating Circuit

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

*Future product—contact factory for availability.

Medical

Point of Sale (POS)

Telematics

Portable Instruments

Portable Audio

Automotive

µSOP

2 7 SQW/INTBX2

1 8 V

SCLCLKIN/INTA 3 6

SDAGND 4 5

DS1341

DS1342

TOP VIEW

DS1341/DS1342

SCL

SDA

CLKIN/INTA

SQW/INTB

GND

CPU

PART TEMP RANGE

PIN-

PACKAGE

OSC

(pF)

DS1341U+

-40NC to +85NC 8 FSOP

DS1341U+T&R

-40NC to +85NC 8 FSOP

DS1342U+*

-40NC to +85NC 8 FSOP

12.5

DS1342U+T&R*

-40NC to +85NC 8 FSOP

12.5

1 2 3 4 5 6 ... 13 14

Shrnutí obsahu

Strany 1 - DS1341/DS1342

_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

Strany 2

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS134210of a match with date of the month. If DY/DT is written to 1, the alarm is the result of a mat

Strany 3

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS134211Control/Status Register (0Fh)Bit 7: Oscillator Stop Flag (OSF). If the OSF bit is a 1, that i

Strany 4

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS134212 I2C Serial Port OperationI2C Slave AddressThe DS1341/DS1342s’ slave address

Strany 5

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS134213DS1341/DS1342s’ slave address is D0h and cannot be modified by the user. When the R/W bit

Strany 6

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS1342Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embod

Strany 7

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13422Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to

Strany 8

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13423AC ELECTRICAL CHARACTERISTICS(VCC = +1.8V to +5.5V, TA = -40NC to +85NC, unless otherwise note

Strany 9

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13424Note 11: CB is the total capacitance of one bus line, including all connected devices, in pF.

Strany 10

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13425 Funct

Strany 11

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13426 Detailed DescriptionThe DS1341/DS1342 low-current RTCs are timekeeping de

Strany 12

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13427External SynchronizationWhen an external clock reference is used, the input from CLKI

Strany 13

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13428Register MapTable 1 shows the map for the DS1341/DS1342 regis-ters. During a multib

Strany 14

Low-Current I2C RTCs for High-ESR CrystalsDS1341/DS13429known state by holding SCL low for tTIMEOUT. Doing so limits the minimum frequency at which th

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Rainbow-electronics DS1342 Uživatelský manuál Strana 1

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