DS1305E+R datasheet, PDF - EEWORLD Datasheet

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DS1305E+R: Description0 TIMER(S), REAL TIME CLOCK, PDIP16; Categorysemiconductor The embedded processor and controller; File Size481KB，21 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1305E+R Overview

0 TIMER(S), REAL TIME CLOCK, PDIP16

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DS1305

Serial Alarm Real-Time Clock

www.maxim-ic.com

FEATURES

Real-Time Clock (RTC) Counts Seconds,

Minutes, Hours, Date of the Month, Month,

Day of the Week, and Year with Leap-Year

Compensation Valid Up to 2100

96-Byte, Battery-Backed NV RAM for Data

Storage

Two Time-Of-Day Alarms, Programmable

on Combination of Seconds, Minutes, Hours,

and Day of the Week

Supports Motorola SPI

™

(Serial Peripheral

Interface) Modes 1 and 3 or Standard 3-Wire

Interface

Burst Mode for Reading/Writing Successive

Addresses in Clock/RAM

Dual-Power Supply Pins for Primary and

Backup Power Supplies

Optional Trickle Charge Output to Backup

Supply

2.0V to 5.5V Operation

Optional Industrial Temperature Range:

-40°C to +85°C

Available in Space-Efficient, 20-Pin TSSOP

Package

Underwriters Laboratory (UL) Recognized

PIN CONFIGURATIONS

TOP VIEW

CC2

BAT

N.C.

INT0

N.C.

INT1

GND

CC1

N.C.

CCIF

SD0

SDI

SCLK

N.C.

SERMODE

DS1305

TSSOP (4.4mm)

CC2

BAT

N.C.

INT0

INT1

GND

CC1

CCIF

SDO

SDI

SCLK

SERMODE

DS1305

DIP (300 mils)

SPI is a trademark of Motorola, Inc.

TYPICAL OPERATING CIRCUIT

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REV: 070705

DS1305

RECOMMENDED LAYOUT FOR CRYSTAL

Local ground plane (Layer 2)

crystal

GND

CLOCK ACCURACY

The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match

between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was

trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External

circuit noise coupled into the oscillator circuit can result in the clock running fast. Refer to

Application

Note 58,

“Crystal Considerations with Dallas Real-Time Clocks” for detailed information.

CLOCK, CALENDAR, AND ALARM

The time and calendar information is obtained by reading the appropriate register bytes. The RTC

registers and user RAM are illustrated in Figure 2. The time, calendar, and alarm are set or initialized by

writing the appropriate register bytes. Note that some bits are set to 0. These bits always read 0 regardless

of how they are written. Also note that registers 12h to 1Fh (read) and registers 92h to 9Fh are reserved.

These registers always read 0 regardless of how they are written. The contents of the time, calendar, and

alarm registers are in the BCD format. The day register increments at midnight. Values that correspond to

the day of week are user-defined but must be sequential (e.g., if 1 equals Sunday, 2 equals Monday and so

on). Illogical time and date entries result in undefined operation.

Except where otherwise noted, the initial power on state of all registers is not defined. Therefore, it is

important to enable the oscillator (EOSC = 0) and disable write protect (WP = 0) during initial

configuration.

WRITING TO THE CLOCK REGISTERS

The internal time and date registers continue to increment during write operations. However, the

countdown chain is reset when the seconds register is written. Writing the time and date registers within

one second after writing the seconds register ensures consistent data.

Terminating a write before the last bit is sent aborts the write for that byte.

READING FROM THE CLOCK REGISTERS

Buffers are used to copy the time and date register at the beginning of a read. When reading in burst

mode, the user copy is static while the internal registers continue to increment.

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