DS1822-PAR_07 DALLAS [Dallas Semiconductor], DS1822-PAR_07 Datasheet - Page 11

• Manufacturer Part Number: DS1822-PAR_07
• Description: Econo 1-Wire Parasite-Power Digital Thermometer
• Manufacturer: DALLAS [Dallas Semiconductor]

ROM COMMANDS FLOW CHART Figure 9
SERIAL NUMBER
DS1822-PAR T
DS1822-PAR T
FAMILY CODE
DS1822-PAR T
READ ROM
COMMAND
CRC BYTE
6 BYTES
1 BYTE
33h
Y
X
X
X
Initialization
Sequence
N
MATCH ROM
MASTER T
MASTER T
MASTER T
COMMAND
MATCH?
MATCH?
MATCH?
BIT 63
BIT 0
BIT 63
BIT 0
BIT 1
BIT 1
55h
Y
Y
Y
Y
MASTER T
DS1822-PAR T
X
X
RESET PULSE
X
PRESENCE
MASTER T
COMMAND
N
PULSE
N
N
N
X
ROM
X
X
(FIGURE 10)
MASTER T
COMMAND
FUNCTION
N
DS1822-PAR T
N
DS1822-PAR T
DS1822-PAR T
DS1822-PAR T
DS1822-PAR T
DS1822-PAR T
N
MASTER T
MASTER T
MASTER T
SEARCH ROM
11 of 19
COMMAND
MATCH?
MATCH?
Y
Y
MATCH?
BIT 63
BIT 0
BIT 1
X
F0h
X
X
X
Y
BIT 63
Y
BIT 0
BIT 1
X
X
X
X
X
X
BIT 63
BIT 63
BIT 0
BIT 0
BIT 1
BIT 1
N
DS1822-PAR T
DS1822-PAR T
MASTER T
ALARM SEARCH
WITH ALARM
COMMAND
FLAG SET?
DEVICE(S)
ECh
X
Y
Y
BIT 0
X
X
BIT 0
BIT 0
N
N
COMMAND
SKIP ROM
CCh
Y
N
DS1822-PAR