Rainbow-electronics DS28EA00 Manual do Utilizador descarregar pdf (Página 17)

DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO

17 of 29

Figure 10-5. Control Function Flow Chart (continued)

From Figure 10

Part

Master

TX Reset?

Master RX “1s“

99h

Chain

Command?

Master TX Inverted

Chain Control Byte

Master TX Chain

Control Byte

DS28EA00 up-

dates chain state

Control Byte

Valid?

Transmission

Error?

Master

TX Reset?

Master RX con-

firmation code AAh

Master

TX Reset?

Master RX

error code 00h

Valid Chain

Control Byte

Codes:

3Ch Off

5Ah On

96h Done

Error defined as:

repeated control

byte not equal to

inverted control byte

To Figure 10

Part

Master

TX Reset?

Master RX

inverted chain

control byte

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 28 29

DS28EA00 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
3 of 29 3
PIN DESCRIPTION 4
OVERVIEW 5
64-BIT REGISTRATION NUMBER 6
PIO Structure 9
Chain Function 9
Table 2. Chain States 9
RECALL EEPROM [B8h] 11
PIO ACCESS READ [F5h] 11
PIO ACCESS WRITE [A5h] 11
CHAIN COMMAND [99h] 12
13 of 29 13
14 of 29 14
15 of 29 15
16 of 29 16
1-Wire BUS SYSTEM 18
HARDWARE CONFIGURATION 18
TRANSACTION SEQUENCE 18
INITIALIZATION 18
SKIP ROM [CCh] 20
OVERDRIVE SKIP ROM [3Ch] 20
OVERDRIVE MATCH ROM [69h] 20
21 of 29 21
22 of 29 22
1-Wire SIGNALING 23
READ/WRITE TIME SLOTS 23
Master-To-Slave 24
Slave-To-Master 24
SEQUENCE DISCOVERY PROCEDURE 26
WRITE SCRATCHPAD 27
READ SCRATCHPAD 27
INVALID DATA BYTE) 29
TRANSMISSION ERROR) 29
INVALID CONTROL BYTE) 29

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