DS2417 Datasheet, PDF (1/15 Pages) Dallas Semiconductor – 1-Wire Time Chip With Interrupt

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PRELIMINARY
DS2417
1-Wire^TM Time Chip With Interrupt
FEATURES
PIN ASSIGNMENT
§ 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
§ Programmable interrupt output for system
6-PIN TSOC PACKAGE
1
6
2
5
3
4
TOP VIEW
wakeup
§ Communicates at 16.3k bits per second
§ Unique, factory-lasered and tested 64-bit reg-
SIDE VIEW
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
solute traceability because no two parts are
See Mech. Drawings
Section
alike
§ 8-bit family code specifies device communi-
cation requirements to bus master
§ Built-in multidrop controller ensures com-
patibility 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
PIN DESCRIPTION
Pin 1 GND
Pin 2 1-Wire
Pin 3
INT
Pin 4
V_DD
Pin 5 X1
Pin 6 X2
running
§ Compact, low cost 6-pin TSOC surface
mount package
ORDERING INFORMATION
DS2417P 6-pin TSOC package
DS2417V Tape & Reel of DS2417P
DS2417X Chip Scale Pkg., Tape & Reel
DESCRIPTION
The DS2417 1-Wire Time Chip with Interrupt offers a simple solution for storing and retrieving vital
time information with minimal hardware. The DS2417 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 DS2417 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 DS2417 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. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first
provide one of four ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip
ROM. The protocol for these ROM functions is described in Figure 7. After a ROM function command
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