DS9101 datasheet(39/55 Pages) MAXIM

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Hygrochron Temperature/Humidity Logger

iButton with 8KB Data-Log Memory

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DS1923 Tx

PRESENCE PULSE

BUS MASTER Tx

RESET PULSE

BUS MASTER Tx ROM

FUNCTION COMMAND

DS1923 Tx

CRC BYTE

DS1923 Tx

FAMILY CODE

(1 BYTE)

DS1923 Tx

SERIAL NUMBER

(6 BYTES)

OD = 0

RC = 0

MASTER Tx BIT 0

RC = 0

RESET PULSE?

33h

READ ROM

COMMAND?

55h

MATCH ROM

COMMAND?

BIT 0 MATCH?

F0h

SEARCH ROM

COMMAND?

ECh

CONDITIONAL SEARCH

COMMAND?

RC = 1

MASTER Tx BIT 1

MASTER Tx BIT 63

BIT 1 MATCH?

BIT 63 MATCH?

RC = 1

FROM MEMORY/CONTROL

FUNCTION FLOWCHART (FIGURE 9)

DS1923 Tx BIT 0

MASTER Tx BIT 0

BIT 1 MATCH?

BIT 63 MATCH?

DS1923 Tx BIT 1

MASTER Tx BIT 1

DS1923 Tx BIT 63

MASTER Tx BIT 63

BIT 0 MATCH?

RC = 1

DS1923 Tx BIT 0

MASTER Tx BIT 0

CONDITION

MET?

BIT 1 MATCH?

BIT 63 MATCH?

DS1923 Tx BIT 1

MASTER Tx BIT 1

DS1923 Tx BIT 63

MASTER Tx BIT 63

FROM FIGURE 11b

TO FIGURE 11b

FROM FIGURE 11b

TO MEMORY/CONTROL

FUNCTION FLOWCHART (FIGURE 9)

Figure 11a. ROM Functions Flowchart

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