DS1822+T MAXIM [Maxim Integrated Products], DS1822+T Datasheet - Page 13

• Manufacturer Part Number: DS1822+T
• Description: Econo 1-Wire Digital Thermometer
• Manufacturer: MAXIM [Maxim Integrated Products]

ROM COMMANDS FLOW CHART Figure 11
SERIAL NUMBER
FAMILY CODE
READ ROM
COMMAND
DS1822 T
DS1822 T
CRC BYTE
DS1822 T
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 0
BIT 63
BIT 1
BIT 1
55h
Y
Y
Y
Y
MASTER T
X
X
RESET PULSE
X
PRESENCE
MASTER T
COMMAND
DS1822 T
N
PULSE
N
N
N
X
ROM
X
X
(FIGURE 12)
MASTER T
COMMAND
FUNCTION
N
N
N
MASTER T
MASTER T
DS1822 T
DS1822 T
DS1822 T
DS1822 T
MASTER T
DS1822 T
DS1822 T
SEARCH ROM
13 of 21
COMMAND
MATCH?
MATCH?
Y
Y
MATCH?
BIT 0
BIT 1
BIT 63
X
F0h
X
X
X
X
X
X
X
X
Y
BIT 63
X
BIT 63
BIT 0
BIT 0
BIT 63
BIT 0
BIT 1
BIT 1
Y
BIT 1
N
MASTER T
ALARM SEARCH
DS1822 T
DS1822 T
WITH ALARM
COMMAND
FLAG SET?
DEVICE(S)
ECh
X
X
X
Y
Y
BIT 0
BIT 0
BIT 0
N
N
COMMAND
SKIP ROM
CCh
Y
N
DS1822