DS1825 Maxim Integrated Products, DS1825 Datasheet - Page 13

• Manufacturer Part Number: DS1825
• Description: Programmable Resolution 1-Wire Digital Thermometer
• Manufacturer: Maxim Integrated Products

Figure 11. ROM COMMANDS FLOW CHART
SERIAL NUMBER
FAMILY CODE
READ ROM
COMMAND
CRC BYTE
DS1825 T
DS1825 T
DS1825 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 1
BIT 63
BIT 1
55h
Y
Y
Y
Y
MASTER T
X
RESET PULSE
X
X
PRESENCE
MASTER T
COMMAND
DS1825 T
N
PULSE
N
N
N
X
ROM
X
X
(FIGURE 12)
MASTER T
COMMAND
FUNCTION
N
N
N
DS1825 T
MASTER T
MASTER T
DS1825 T
DS1825 T
DS1825 T
MASTER T
DS1825 T
DS1825 T
13 of 21
SEARCH ROM
COMMAND
MATCH?
MATCH?
Y
Y
MATCH?
BIT 0
BIT 1
BIT 63
X
F0h
X
X
X
X
X
X
BIT 63
X
X
Y
X
BIT 0
BIT 0
BIT 63
BIT 63
BIT 0
BIT 1
BIT 1
Y
BIT 1
N
MASTER T
ALARM SEARCH
DS1825 T
DS1825 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