DS1344D-33+【PDF 1/20 页】IC RTC SPI 3.3V 14TDFN-EP

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Low-Current SPI/3-Wire RTCs

DS1343/DS1344

19-5801; Rev 1; 12/11

General Description

The DS1343/DS1344 low-current real-time clocks (RTCs)

are timekeeping devices that provide an extremely low

standby current, permitting longer life from a backup

supply source. The devices also support high-ESR

crystals, broadening the pool of usable crystals for the

devices. 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 24-hour or

12-hour format with an AM/PM indicator.

Address and data are transferred serially through an

SPI or 3-wire interface. Two programmable time-of-day

alarms are provided. Each alarm can generate an inter-

rupt on a combination of seconds, minutes, hours, and

day. Don’t-care states can be inserted into one or more

fields if it is desired for them to be ignored for the alarm

condition. The time-of-day alarms can be programmed

to assert two different interrupt outputs, or they can be

combined to assert one common interrupt output. Both

interrupt outputs operate when the device is powered by

either VCC or VBAT.

The devices are available in a lead-free/RoHS-compliant,

20-pin TSSOP or 14-pin TDFN package, and support a

-40°C to +85°C extended industrial temperature range.

Applications

Medical

Handheld Devices

Telematics

Embedded Timestamping

Features

Low Timekeeping Current of 250nA (typ)

Compatible with Crystal ESR Up to 100kI

Versions Available to Support Either 6pF or

12.5pF Crystals

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

Month, and Year with Leap Year Compensation

Valid Through 2099

Power-Fail and Switch Circuitry

Three Operating Voltages

1.8V ±5%

3.0V±10%

3.3V ±10%

Trickle-Charge Capability

Maintain Time Down to 1.15V (typ)

Support Motorola SPI Modes 1 and 3, or Standard

3-Wire Interface

Burst Mode for Reading/Writing Successive

Addresses in Clock/RAM

96-Byte Battery-Backed NV RAM for Data Storage

Two Time-of-Day Alarms with Two Interrupt

Outputs

Industrial Temperature Range

20-Pin TSSOP or 14-Pin TDFN Package

Underwriters Laboratories (UL) Recognized

Ordering Information appears at end of data sheet.

Typical Operating Circuit

DS1343

DS1344

INT0

INT1

SCLK

SDI

SDO

VBAT

GND

SERMODE

VCC

INT

RST

3-WIRE

PORT

NOTE: SHOWN IN 3-WIRE I/O CONFIGURATION.

RPU

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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