DS2415P- datasheet, PDF - EEWORLD Datasheet

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DS2415P-: DescriptionReal Time Clock; Categorysemiconductor Analog mixed-signal IC; File Size243KB，14 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS2415P- Overview

Real Time Clock

DS2415P- Parametric

Parameter Name	Attribute value
Product Category	Real Time Clock
Manufacturer	Maxim
RoHS	Details
Mounting Style	SMD/SMT
Package / Case	TSOC
RTC Bus Interface	Serial
Time Format	Binary
Supply Voltage - Max	5.5 V
Supply Voltage - Min	2.5 V
Maximum Operating Temperature	+ 85 C
Minimum Operating Temperature	- 40 C
Function	Calendar, Clock
Product	Real Time Clocks

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DS2415

1-Wire Time Chip

www.maxim-ic.com

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

6-Pin TSOC PACKAGE

TOP VIEW

PIN DESCRIPTION

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

GND

1-Wire

BAT

6-pin TSOC package

Tape & Reel of DS2415P

Chip Scale Pkg., Tape &

Reel

ORDERING INFORMATION

DS2415P

DS2415P/T&R

DS2415X

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

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112701

DS2415

TIMEKEEPING

A 32.768kHz crystal oscillator is used as the time base for the real-time clock counter. The oscillator can

be turned on or off under software control. The oscillator must be on for the real-time clock to function.

The real-time clock counter is double-buffered. This allows the master to read time without the data

changing while it is being read. To accomplish this, a snapshot of the counter data is transferred to a

read/write buffer, which the user accesses.

DEVICE CONTROL BYTE

The on/off control of the 32.768kHz crystal oscillator is done through the device control byte. This byte

can be read and written through the Clock Function commands.

Device Control Byte

Bit 0 - 1

No function

OSC

Bits 0 and 1 are hard-wired to read all 0s.

Bit 2 - 3

OSC

Oscillator Enable/Disable

These bits control/report whether the 32.768kHz crystal oscillator is running. If the oscillator is running,

both OSC bits will read 1. If the oscillator is turned off these bits will read 0. When writing the device

control byte both occurrences of the OSC bit should have identical data. Otherwise, the value in bit

address 3 (bold) takes precedence.

Bit 4 - 7

General-purpose user flags

These bits have no particular function within the chip. They can be read and written under the control of

the application software and remain non-volatile as long as there is sufficient voltage at the V

pin. If

the DS2415 is located inside a battery pack, for example, these bits could convey data on the charging

status from the charging station to the equipment that uses the battery.

Real-Time Clock

The real-time clock is a 32-bit binary counter. It is incremented once per second. The real-time clock can

accumulate 136 years of seconds before rolling over. Time/date is represented by the number of seconds

since a reference point, which is determined by the user. For example, 12:00 a.m., January 1, 1970 could

be a reference point.

CLOCK FUNCTION COMMANDS

The “Clock Function Flow Chart” (Figure 5) describes the protocols necessary for accessing the real-time

clock. With only four bytes of real-time clock and one control byte the DS2415 does not provide random

access. Reading and writing always starts with the device control byte followed by the least significant

byte (LSB) of the time data.

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DS2415P- Related Products

	DS2415P-	DS2415P-W
Description	Real Time Clock	Real Time Clock
Product Category	Real Time Clock	Real Time Clock
Manufacturer	Maxim	Maxim

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