DS1925 datasheet(7/46 Pages) MAXIM

7 / 46 page

Figure 1. DS1925 Block Diagram

Figure 2. Hierarchical Structure for 1-Wire Protocol

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

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ROM FUNCTION

CONTROL

64-BIT LASERED

ROM

MEMORY

FUNCTION

CONTROL

PARASITE

POWERED

CIRCUITRY

256-BIT

SCRATCHPAD

GENERAL-PURPOSE

NV MEMORY

(512 BYTES)

(64 BYTES)

INTERNAL

TIMEKEEPING AND

CONTROL REGISTERS

AND COUNTERS

DATA-LOG

MEMORY

122KB

CONTROL

LOGIC

ADC

THERMAL

SENSE

32.768kHz

OSCILLATOR

DS1925

3V LITHIUM

I/O

1-Wire

PORT

BUS

MASTER

OTHER

DEVICES

1-Wire NET

COMMAND

LEVEL:

DS1925

AVAILABLE

COMMANDS:

DATA FIELD

AFFECTED:

READ ROM

MATCH ROM

SEARCH ROM

CONDITIONAL SEARCH ROM

SKIP ROM

RESUME

OVERDRIVE-SKIP ROM

OVERDRIVE-MATCH ROM

1-Wire ROM FUNCTION

COMMANDS

DS1925-SPECIFIC

MEMORY FUNCTION

COMMANDS

WRITE SCRATCHPAD

READ SCRATCHPAD

XPC COPY SCRATCHPAD

XPC READ MEMORY

XPC CLEAR MEMORY

XPC FORCED CONVERSION

XPC READ BATTERY VOLTAGE

XPC START MISSION

XPC STOP MISSION

64-BIT ROM, RC-FLAG

64-BIT ROM, RC-FLAG, ALARM FLAGS,

SEARCH CONDITIONS

RC-FLAG

RC-FLAG, OD-FLAG

64-BIT ROM, RC-FLAG, OD-FLAG

256-BIT SCRATCHPAD, FLAGS

256-BIT SCRATCHPAD

512-BYTE DATA MEMORY, REGISTERS, FLAGS,

PASSWORDS

MEMORY, REGISTERS, PASSWORDS

MISSION TIMESTAMP, MISSION SAMPLES

COUNTER, START DELAY, ALARM FLAGS,

PASSWORDS, RTC

MEMORY ADDRESSES 020Ch–020Dh

NONE

FLAGS

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