DS1307ZN datasheet, PDF - EEWORLD Datasheet

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DS1307ZN: Description1 TIMER(S), REAL TIME CLOCK, PDSO8; Categorysemiconductor The embedded processor and controller; File Size164KB，11 Pages; ManufacturerTiger Electronic Co.,Ltd.; Websitehttp://www.tgselec.com/

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DS1307ZN Overview

1 TIMER(S), REAL TIME CLOCK, PDSO8

DS1307ZN Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply/operating voltage	5.5 V
Minimum supply/operating voltage	4.5 V
Rated supply voltage	5 V
Processing package description	0.150 INCH, SOIC-8
state	TRANSFERRED
Craftsmanship	CMOS
packaging shape	Rectangle
Package Size	SMALL OUTLINE
surface mount	Yes
Terminal form	GULL WING
Terminal location	pair
Packaging Materials	Plastic/Epoxy
Temperature level	INDUSTRIAL
Maximum FCLK clock frequency	0.0320 MHz
Information access methods	I2C
Microprocessor type	Real Time Clock
Number of timers	1

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TIGER ELECTRONIC CO.,LTD

DS1307

64 X 8 Serial Real Time Clock

FEATURES

Real time clock counts seconds, minutes,

hours, date of the month, month, day of the

week, and year with leap year compensation

valid up to 2100

56 byte nonvolatile RAM for data storage

2-wire serial interface

Programmable squarewave output signal

Automatic power-fail detect and switch

circuitry

Consumes less than 500 nA in battery backup

mode with oscillator running

Optional industrial temperature range

-40°C to +85°C

Available in 8-pin DIP or SOIC

Recognized by Underwriters Laboratory

PIN ASSIGNMENT

BAT

GND

SQW/OUT

SCL

SDA

DS1307 8-Pin DIP (300 mil)

BAT

GND

SQW/OUT

SCL

SDA

DS1307Z 8-Pin SOIC (150 mil)

PIN DESCRIPTION

X1, X2

BAT

GND

SDA

SCL

SQW/OUT

- Primary Power Supply

- 32.768 kHz Crystal Connection

- +3V Battery Input

- Ground

- Serial Data

- Serial Clock

- Square wave/Output Driver

ORDERING INFORMATION

DS1307

DS1307Z

DS1307N

DS1307ZN

8-Pin DIP

8-Pin SOIC (150 mil)

8-Pin DIP (Industrial)

8-Pin SOIC (Industrial)

DESCRIPTION

The DS1307 Serial Real Time Clock is a low power, full BCD clock/calendar plus 56 bytes of

nonvolatile SRAM. Address and data are transferred serially via a 2-wire bi-directional bus. The

clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the

month date is automatically adjusted for months with less than 31 days, including corrections for leap

year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1307

has a built-in power sense circuit which detects power failures and automatically switches to the battery

supply.

1 of 11

081800

DS1307

SCL (Serial Clock Input)

- SCL is used to synchronize data movement on the serial interface.

SDA (Serial Data Input/Output) -

SDA is the input/output pin for the 2-wire serial interface. The SDA

pin is open drain which requires an external pullup resistor.

SQW/OUT (Square Wave/ Output Driver) -

When enabled, the SQWE bit set to 1, the SQW/OUT pin

outputs one of four square wave frequencies (1 Hz, 4 kHz, 8 kHz, 32 kHz). The SQW/OUT pin is open

drain which requires an external pullup resistor. SQW/OUT will operate with either Vcc or Vbat applied.

X1, X2

- Connections for a standard 32.768 kHz quartz crystal. The internal oscillator circuitry is

designed for operation with a crystal having a specified load capacitance (CL) of 12.5 pF.

For more information on crystal selection and crystal layout considerations, please consult Application

Note 58, “Crystal Considerations with Dallas Real Time Clocks.” The DS1307 can also be driven by an

external 32.768 kHz oscillator. In this configuration, the X1 pin is connected to the external oscillator

signal and the X2 pin is floated.

Please review Application Note 95, “Interfacing the DS1307 with a 8051-Compatible Microcontroller”

for additional information.

RTC AND RAM ADDRESS MAP

The address map for the RTC and RAM registers of the DS1307 is shown in Figure 2. The real time

clock registers are located in address locations 00h to 07h. The RAM registers are located in address

locations 08h to 3Fh. During a multi-byte access, when the address pointer reaches 3Fh, the end of RAM

space, it wraps around to location 00h, the beginning of the clock space.

DS1307 ADDRESS MAP

Figure 2

00H

SECONDS

MINUTES

HOURS

DAY

DATE

MONTH

YEAR

07H

08H

3FH

CONTROL

RAM

56 x 8

CLOCK AND CALENDAR

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

clock registers are illustrated in Figure 3. The time and calendar are set or initialized by writing the

appropriate register bytes. The contents of the time and calendar registers are in the Binary-Coded

Decimal (BCD) format. Bit 7 of Register 0 is the Clock Halt (CH) bit. When this bit is set to a 1, the

oscillator is disabled. When cleared to a 0, the oscillator is enabled.

Please note that the initial power on state of all registers is not defined. Therefore it is important to

enable the oscillator (CH bit=0) during initial configuration.

3 of 11

DS1307

2-WIRE SERIAL DATA BUS

The DS1307 supports a bi-directional 2-wire bus and data transmission protocol. A device that sends

data onto the bus is defined as a transmitter and a device receiving data as a receiver. The device that

controls the message is called a master. The devices that are controlled by the master are referred to as

slaves. The bus must be controlled by a master device which generates the serial clock (SCL), controls

the bus access, and generates the START and STOP conditions. The DS1307 operates as a slave on the

2-wire bus. A typical bus configuration using this 2-wire protocol is show in Figure 4.

TYPICAL 2-WIRE BUS CONFIGURATION

Figure 4

Figures 5, 6, and 7 detail how data is transferred on the 2-wire bus.

Data transfer may be initiated only when the bus is not busy.

During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in

the data line while the clock line is high will be interpreted as control signals.

Accordingly, the following bus conditions have been defined:

Bus not busy:

Both data and clock lines remain HIGH.

Start data transfer:

A change in the state of the data line, from HIGH to LOW, while the clock is HIGH,

defines a START condition.

Stop data transfer:

A change in the state of the data line, from LOW to HIGH, while the clock line is

HIGH, defines the STOP condition.

Data valid:

The state of the data line represents valid data when, after a START condition, the data line

is stable for the duration of the HIGH period of the clock signal. The data on the line must be changed

during the LOW period of the clock signal. There is one clock pulse per bit of data.

Each data transfer is initiated with a START condition and terminated with a STOP condition. The

number of data bytes transferred between START and STOP conditions is not limited, and is determined

by the master device. The information is transferred byte-wise and each receiver acknowledges with a

ninth bit. Within the 2-wire bus specifications a regular mode (100 kHz clock rate) and a fast mode

(400 kHz clock rate) are defined. The DS1307 operates in the regular mode (100 kHz) only.

5 of 11

DS1307ZN Related Products

	DS1307ZN	DS1307	DS1307N	DS1307Z
Description	1 TIMER(S), REAL TIME CLOCK, PDSO8	GENERAL PURPOSE INDUCTOR	1 TIMER(S), REAL TIME CLOCK, PDIP8	1 TIMER(S), REAL TIME CLOCK, PDSO8
state	TRANSFERRED	ACTIVE	ACTIVE	ACTIVE
Number of functions	1	-	1	1
Number of terminals	8	-	8	8
Maximum operating temperature	85 Cel	-	85 Cel	70 Cel
Minimum operating temperature	-40 Cel	-	-40 Cel	0.0 Cel
Maximum supply/operating voltage	5.5 V	-	5.5 V	5.5 V
Minimum supply/operating voltage	4.5 V	-	4.5 V	4.5 V
Rated supply voltage	5 V	-	5 V	5 V
Processing package description	0.150 INCH, SOIC-8	-	0.300 INCH, PLASTIC, DIP-8	0.150 INCH, SOIC-8
Craftsmanship	CMOS	-	CMOS	CMOS
packaging shape	Rectangle	-	RECTANGULAR	Rectangle
Package Size	SMALL OUTLINE	-	IN-LINE	SMALL OUTLINE
Terminal form	GULL WING	-	THROUGH-HOLE	GULL WING
Terminal location	pair	-	DUAL	pair
Packaging Materials	Plastic/Epoxy	-	PLASTIC/EPOXY	Plastic/Epoxy
Temperature level	INDUSTRIAL	-	INDUSTRIAL	COMMERCIAL
Maximum FCLK clock frequency	0.0320 MHz	-	0.0320 MHz	0.0320 MHz
Information access methods	I2C	-	I2C	I2C
Microprocessor type	Real Time Clock	-	REAL TIME CLOCK	Real Time Clock
Number of timers	1	-	1	1

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