Datasheet

Figure 7.ROM Commands Flowchart
F0h
SEARCH
ROM?
N
BIT 0
MATCH?
BIT 0
MATCH?
CCh
SKIP
ROM?
N
N
55h
MATCH
ROM?
N
NN
33h
READ
ROM?
N
Y
Y Y
Y
Y
MASTER T
X
BIT 0
DEVICE T
X
FAMILY CODE
1 BYTE
MASTER T
X
FUNCTION COMMAND
DEVICE T
X
SERIAL NUMBER
6 BYTES
DEVICE T
X
CRC BYTE
MASTER T
X
ROM COMMAND
DEVICE T
X
PRESENCE PULSE
MASTER T
X
RESET PULSE
INITIALIZATION
SEQUENCE
DEVICE T
X
BIT 0
DEVICE T
X
BIT 0
MASTER T
X
BIT 0
MASTER T
X
BIT 63
DEVICE T
X
BIT 63
DEVICE T
X
BIT 63
MASTER T
X
BIT 63
BIT 1
MATCH?
BIT 1
MATCH?
NN
BIT 63
MATCH?
BIT 63
MATCH?
NN
Y
Y
ECh
ALARM SEARCH
COMMAND
N
DEVICE(S)
WITH ALARM
FLAG SET?
Y
DEVICE T
X
BIT
DEVICE T
X
BIT
MASTER T
X
BIT 0
Y
Y Y
MASTER T
X
BIT 1
DEVICE T
X
BIT 1
DEVICE T
X
BIT 1
MASTER T
X
BIT 1
Y
MAX31820 1-Wire Ambient Temperature Sensor
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Maxim Integrated │ 13