1-Wire Digital Thermometer with

Sequence Detect and PIO

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21

MASTER Tx BIT 0

OD = 1

OD = 1

OD = 0

*

*THE OD FLAG REMAINS AT 1 IF THE DEVICE WAS ALREADY AT OVERDRIVE SPEED BEFORE THE OVERDRIVE-MATCH ROM COMMAND WAS ISSUED.

*

*

CHAIN = ON?

Y

N

Y

CCh

SKIP ROM

COMMAND?

N

Y

3Ch

OVERDRIVE-

SKIP ROM?

N

Y

EN = LOW?

Y

Y

0Fh

CONDITIONAL

READ ROM?

Y

69h

OVERDRIVE-

MATCH ROM?

N

N

N

N

OD = 0

N

OD = 0

N

MASTER Tx BIT 1

MASTER Tx BIT 63

Y

Y

Y

BIT 0 MATCH?

MASTER Tx

RESET?

BIT 63 MATCH?

BIT 1 MATCH?

N

Y

MASTER Tx

RESET?

N

TO FIGURE 11a

FROM FIGURE 11a

FROM FIGURE 11a

TO FIGURE 11a

DS28EA00 Tx

FAMILY CODE

(1 BYTE)

DS28EA00 Tx

SERIAL NUMBER

(6 BYTES)

DS28EA00 Tx

CRC BYTE

Figure 11b. ROM Functions Flowchart