DS1922T-F5# Maxim Integrated Products, DS1922T-F5# Datasheet - Page 39

• Manufacturer Part Number: DS1922T-F5#
• Description: IBUTTON TEMP LOGGER
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1922T-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 512B
• Memory Type: NVSRAM (Non-Volatile SRAM)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 11a. ROM Functions Flowchart
______________________________________________________________________________________
FUNCTION COMMAND
BUS MASTER Tx ROM
SERIAL NUMBER
FAMILY CODE
Temperature Logger iButton with 8KB
COMMAND?
READ ROM
DS1922 Tx
DS1922 Tx
DS1922 Tx
FROM MEMORY/CONTROL FUNCTION
CRC BYTE
(6 BYTES)
(1 BYTE)
RC = 0
33h
Y
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
TO MEMORY/CONTROL FUNCTION
Y
Y
Y
Y
FLOWCHART (FIGURE 9)
PRESENCE PULSE
BUS MASTER Tx
RESET PULSE?
RESET PULSE
N
N
N
DS1922 Tx
Y
N
OD
N
N
N
MASTER Tx BIT 63
DS1922 Tx BIT 63
DS1922 Tx BIT 63
MASTER Tx BIT 0
MASTER Tx BIT 1
DS1922 Tx BIT 0
DS1922 Tx BIT 0
DS1922 Tx BIT 1
DS1922 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
MASTER Tx BIT 63
DS1922 Tx BIT 63
DS1922 Tx BIT 63
MASTER Tx BIT 0
MASTER Tx BIT 1
DS1922 Tx BIT 0
DS1922 Tx BIT 0
DS1922 Tx BIT 1
DS1922 Tx BIT 1
BIT 63 MATCH?
BIT 0 MATCH?
BIT 1 MATCH?
COMMAND?
CONDITION
RC = 0
RC = 1
MET?
Data-Log Memory
ECh
Y
Y
Y
Y
Y
N
FROM FIGURE 11b
FROM FIGURE 11b
TO FIGURE 11b
TO FIGURE 11b
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