DS2415 Datasheet, PDF (1/14 Pages) Dallas Semiconductor – 1-Wire Time Chip

DS2415
1-Wire^TM Time Chip
www.dalsemi.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 16.3 kbits 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_DD voltage range of
2.5V to 5.5V from -40°C to +85°C
Low power, 200 nA 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
- GND
Pin 2
- 1-Wire
Pin 3
- V_DD
Pin 4
- V_BAT
Pin 5
- X1
Pin 6
- X2
ORDERING INFORMATION
DS2415P 6-pin TSOC package
DS2415V 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 32.768 kHz
crystal. All data is read and written least significant bit first. The real time clock functions will not be
available until the ROM function protocol has been established. This protocol is described in the ROM
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