DS1925 datasheet(24/46 Pages) MAXIM

24 / 46 page

Figure 9d. Memory/Control Function Flowchart (continued)

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

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START DELAY

COUNTER = 0?

DDh

XPC START

MISSION?

FROM FIGURE 9

3rd PART, XPC

DS1925 SETS WFTA = 1

DS1925 WAITS ONE

SAMPLE PERIOD

DS1925 SETS WFTA = 0

DS1925 START LOGGING

TAKING FIRST SAMPLE

DS1925 WAITS ONE

SAMPLE PERIOD

DS1925 COPIES RTC

DATA TO MISSION

TIMESTAMP REGISTER

DS1925 WAITS FOR

1 MINUTE

SUTA = 1?

TEMP.

ALARM?

DS1925 PERFORMS

TEMP. CONVERSION

*STRONG PULLUP REQUIRED

MASTER Rx CRC16

MASTER WAITS

(tLSTD

OR tLSTD + tSRTC) +

MASTER Tx

FFh RELEASE BYTE

DS1925 INITIATES MISSION

START DELAY PROCESS

MASTER Rx REPEAT

RESULT BYTE

PASSWORD

ACCEPTED?

MASTER Tx 64-BITS

[PASSWORD]

MASTER

Tx RESET?

MISSION IN

PROGRESS?

MEMCLR = 1?

MISSION START

DELAY PROCESS

DS1925 DECREMENTS

START DELAY COUNTER

MIP = 0?

END OF PROCESS

+ANY DS1925 DEVICE THAT IS IN AN UNKNOWN STATE SHOULD BE ASSUMED TO REQUIRE THE

ADDITIONAL DELAY OF tSRTC TO ENSURE PROPER OPERATION UNTIL THE DEVICE STATE IS ESTABLISHED

BY COMMAND OR QUERY. FAILURE TO DO SO MAY CAUSE THE DEVICE TO EXPERIENCE A POWER-ON

RESET OR BATTERY-FAIL EVENT, SET THE BOR ALARM FLAG, AND DISABLE DEVICE FEATURES.

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