DS1922E-F5 MAXIM [Maxim Integrated Products], DS1922E-F5 Datasheet - Page 32

• Manufacturer Part Number: DS1922E-F5
• Description: High-Temperature Logger iButton with 8KB Data-Log Memory
• Manufacturer: MAXIM [Maxim Integrated Products]

High-Temperature Logger iButton with 8KB
Data-Log Memory
Figure 11a. ROM Functions Flowchart
32
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FUNCTION COMMAND
BUS MASTER Tx ROM
SERIAL NUMBER
FAMILY CODE
COMMAND?
DS1922E Tx
DS1922E Tx
DS1922E Tx
READ ROM
CRC BYTE
(6 BYTES)
(1 BYTE)
RC = 0
33h
Y
FROM MEMORY FUNCTIONS
FLOWCHART (FIGURE 9)
N
MASTER Tx BIT 63
MASTER Tx BIT 0
MASTER Tx BIT 1
BIT 63 MATCH?
BIT 0 MATCH?
BIT 1 MATCH?
MATCH ROM
COMMAND?
RC = 0
RC = 1
55h
Y
Y
Y
Y
TO MEMORY FUNCTIONS
FLOWCHART (FIGURE 9)
PRESENCE PULSE
BUS MASTER Tx
RESET PULSE?
RESET PULSE
DS1922E Tx
N
N
N
Y
N
OD
N
N
N
DS1922E Tx BIT 63
DS1922E Tx BIT 63
MASTER Tx BIT 63
DS1922E Tx BIT 0
DS1922E Tx BIT 0
DS1922E Tx BIT 1
DS1922E Tx BIT 1
MASTER Tx BIT 0
MASTER Tx BIT 1
BIT 63 MATCH?
BIT 0 MATCH?
BIT 1 MATCH?
SEARCH ROM
COMMAND?
RC = 0
RC = 1
N
F0h
Y
Y
Y
Y
OD = 0
N
N
N
N
N
CONDITIONAL SEARCH
DS1922E Tx BIT 63
DS1922E Tx BIT 63
MASTER Tx BIT 63
DS1922E Tx BIT 0
DS1922E Tx BIT 0
DS1922E Tx BIT 1
DS1922E Tx BIT 1
MASTER Tx BIT 0
MASTER Tx BIT 1
BIT 63 MATCH?
BIT 0 MATCH?
BIT 1 MATCH?
COMMAND?
CONDITION
RC = 0
RC = 1
MET?
ECh
Y
Y
Y
Y
Y
N
FROM FIGURE 11b
FROM FIGURE 11b
TO FIGURE 11b
TO FIGURE 11b