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DS2415V

1-Wire™ Time Chip

Dallas Semiconductor -> Maxim Integrated 

DS2415

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.

2

1-Wire Data input/output. Open drain.

3

VDD

Internal power line. Connect a capacitor

4

VBAT

Power input pin. 2.5V to 5.5V.

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

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

capacitance).

5,6

X1,X2 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 X8 + X5 + X4 + 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.”

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