DS2415P+ Datasheet DS2415P+, DS2415X | P1-P3

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FEATURES

§ Real-time clock with fully compatible 1-

Wire

MicroLAN interface

§ Uses the same binary time/date

representation as the DS2404 but with 1

second resolution

§ Clock accuracy ±2 minutes per month at

25°C

§ Communicates at 16.3kbits per second

§ Unique, factory-lasered and tested 64-bit

registration number (8-bit family code + 48-

bit serial number + 8-bit CRC tester) assures

absolute traceability because no two parts are

alike

§ 8-bit family code specifies device

communication requirements to bus master

§ Built-in multidrop controller ensures

compatibility with other MicroLAN products

§ Operates over a wide V

voltage range of

2.5V to 5.5V from -40°C to +85°C

§ Low power, 200nA typically with oscillator

running

§ Compact, low cost 6-pin TSOC surface

mount package

PIN ASSIGNMENT

PIN DESCRIPTION

Pin 1 - GND

Pin 2 - 1-Wire

Pin 3 - V

Pin 4 - V

BAT

Pin 5 - X1

Pin 6 - X2

ORDERING INFORMATION

DS2415P 6-pin TSOC package

DS2415P/T&R Tape & Reel of DS2415P

DS2415X Chip Scale Pkg., Tape &

Reel

DESCRIPTION

The DS2415 1-Wire time chip offers a simple solution for storing and retrieving vital time information

with minimal hardware. The DS2415 contains a unique, lasered ROM and a real-time clock/calendar

implemented as a binary counter. Only one pin is required for communication with the device. Utilizing a

backup energy source, the data is nonvolatile and allows for stand-alone operation. The DS2415 features

can be used to add functions such as calendar, time and date stamp, and logbook to any type of electronic

device or embedded application that uses a microcontroller.

OVERVIEW

The DS2415 has two main data components: 1) 64-bit lasered ROM, and 2) real-time clock counter

(Figure 1). The real-time clock utilizes an on-chip oscillator that is connected to an external 32.768kHz

crystal. All data is read and written least significant bit first. The real-time clock functions will not be

DS2415

1-Wire

Time Chip

www.maxim-ic.com

6-Pin TSOC PACKAGE

TOP VIEW

DS2415

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available until the ROM function protocol has been established. This protocol is described in the ROM

functions flow chart (Figure 7). The master must first provide one of four ROM function commands: 1)

Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. After a ROM function sequence has been

successfully executed, the real-time clock functions are accessible and the master may then provide a real

time clock function command (Figure 5).

DETAILED PIN DESCRIPTION

PIN SYMBOL DESCRIPTION

1 GND

Ground pin.

21-WireData input/output. Open drain.

Internal power line. Connect a capacitor

BAT

Power input pin. 2.5V to 5.5V.

5, 6 X1, X2

Crystal pins. Connections for a standard 32.768kHz quartz crystal,

EPSON part number C-002RX or C-004R (be sure to request 6pF load

capacitance).

NOTE: X1 and X2 are very high-impedance nodes. It is recommended

that they and the crystal be guard-ringed with ground and that high

frequency signals be kept away from the crystal area. See Figure 10 and

Application Note 58 for details.

BLOCK DIAGRAM Figure 1

64-BIT LASERED ROM

Each DS2415 contains a unique ROM code that is 64 bits long. The first 8 bits are a 1-Wire family code.

The next 48 bits are a unique serial number. The last 8 bits are a CRC of the first 56 bits. (See Figure 3.)

The 1-Wire CRC of the lasered ROM is generated using the polynomial X

+ X

+ 1. Additional

information about the Dallas Semiconductor 1-Wire Cyclic Redundancy Check is available in the Book

of DS19xx iButton Standards

. The 64-bit ROM and ROM Function Control section allow the DS2415 to

operate as a 1-Wire device and follow the 1-Wire protocol detailed in the section ”1-Wire Bus System.”

DS2415

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The functions required to exercise the control functions of the DS2415 are not accessible until the ROM

function protocol has been satisfied. This protocol is described in the ROM functions flow chart

(Figure 7). The 1-Wire bus master must first provide one of the four ROM function commands. After a

ROM function sequence has been successfully executed, the bus master may then provide one of the

function commands specific to the DS2415 (Figure 5).

HIERARCHICAL STRUCTURE FOR 1-WIRE PROTOCOL Figure 2

64-BIT LASERED ROM Figure 3

MSB LSB

8-Bit CRC Code 48-Bit Serial Number 8-Bit Family Code (24H)

MSB LSB MSB LSB MSB LSB

1-WIRE CRC GENERATOR Figure 4

Polynomial = X

+ X

+ 1

P1-P3 P4-P6 P7-P9 P10-P12 P13-P14

DS2415P+

Mfr. #:

Buy DS2415P+

Manufacturer:

Maxim Integrated

Description:

Real Time Clock

Lifecycle:

New from this manufacturer.

Delivery:

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DS2415P+

DS2415P+

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