Rainbow-electronics DS28EA00 Manual do Utilizador descarregar pdf (Página 13)

DS28EA00 1-Wire Digital Thermometer with Sequence Detect and PIO

13 of 29

Figure 10-1. Control Function Flow Chart

From Figure 10

Part

To Figure 10

Part

BEh

Read Scratch-

pad?

4Eh

Write Scratch-

pad?

To ROM Functions

Flow Chart (Figure 12)

Master TX data

byte to scratchpad

DS28EA00 sets

byte address = 2

DS28EA00 incre-

ments byte address

Byte

Address = 4?

Master

TX Reset?

Master

TX Reset?

Master RX byte

from scratchpad

DS28EA00 sets

byte address = 0

DS28EA00 incre-

ments byte address

Byte

Address = 7?

Master

TX Reset?

Master RX 8-bit

CRC of data

Master

TX Reset?

Master RX “1s“

Bus Master TX Control

Function Command

From ROM Functions

Flow Chart (Figure 12)

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 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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